A search for WIMP dark matter has been undertaken with new-generation germanium heat-and-ionization detectors in the EDELWEISS-II experiment. The InterDigit bolometers, with an interleaved electrode design, have proven excellent rejection performance against the surface event background which is limiting germanium bolometer dark matter searches. One year of continuous operation at the Laboratoire Souterrain de Modane has been achieved with an array of ten 400g detectors. Results will be presented and future prospects for this experiment will be discussed.
Poster We present a multicolor light curve (LC) model of the shock breakout and plateau of Type IIP Supernova (SN) .
The model successfully reproduces the multicolor UV-optical LCs of the shock breakout and plateau of observed events consistently.
Since the shock breakout is more sensitive to the explosion energy and the presupernova radius than the plateau, the SN and progenitor properties are constrained more tightly than only with the plateau observation.
If an SN being identical to the one at z=1, the SN brightness will be mB ~ 27.6 mag in the host galaxy with an average extinction. It is bright enough to be detected with 8m-class telescopes.
Poster We consider a charge particle propagating in medium composed of neutrons and constant homogeneous magnetic field. This consideration implies finding of exact solutions of modified Dirac equations that contain the corresponding effective potentials accounting for the matter influence on particles and magnetic field. For the case of nonmoving medium the exact solutions of modified Dirac equation are obtained. This can be regarded as the first approach to modelling of an electron propagating inside a rotating neutron star.
ALICE is the only experiment of the LHC designed for heavy ion collisions. Its purpose is to study the phase diagram of nuclear matter and in particular its deconfined phase: the Plasma of Quarks and Gluons. Heavy flavour and quarkonia measurements are one the main tools to characterize the medium formed during hadronic collisions. The proton-proton data are used as references to interpret the nucleus-nucleus collisions. We will present the first results on heavy flavour and quarkonia in proton-proton collisions at Ös=7TeV measured by ALICE in both forward and mid-rapidities. In conclusion, we will present the prospects on heavy flavour and quarkonia measurements in proton and heavy ion collisions.
Poster The case for a four dimensional graviton mass (non zero) influencing reacceleration of the universe in five dimensions is stated; with emphasis upon if five dimensional geometries as given below give us new physical insight as to cosmological evolution. A calculated inflaton may partly re-emerge after fading out in the aftermath of inflation. The inflaton may be the source of re acceleration of the universe, especially if the effects of a re emergent inflaton are in tandem with the appearance of macro effects of a small graviton mass, leading to a speed up of the rate of expansion of the universe at red shit value of Z .423. A final statement as to how and why the radius of the universe question may be affected by these deliberations is presented , in terms of if the graviton is either purely a field theoretic , or semi classical object, as via t'Hoofts deterministic QM is presented in the end, as an open question.
IceCube is a km3-scale neutrino telescope under construction at the South Pole since the austral summer 2004/2005. At the moment it is taking data with 40 deployed InIce strings as well as 79 surface tanks belonging to the IceTop air shower array. The full detector is expected to be completed in 2011 with a total of 86 strings each holding 60 digital optical modules. The progenitor detector AMANDA has been operating at the same site since 1997. A summary of the status and first physics results of the IceCube project will be presented.
The NEMO-3 experiment located in the Modane Underground Laboratory is searching for neutrinoless double beta decay. The experiment has been taking data since 2003 with seven isotopes. The main isotopes are 7kg of 100Mo and 1kg of 82Se. New results using 150Nd, an isotope of special interest due to its potential use in future experiments, as well as 96Zr and 116Cd will also be presented. No evidence for neutrinoless double beta decay has been observed to date. The data are also interpreted in terms of alternative models, such as weak right-handed currents or Majoron emission. We will show results for the standard model double beta decay process for all seven isotopes employed in NEMO-3. These measurements are important for reducing the uncertainties on nuclear matrix elements.
Recent results from the search for the Standard Model Higgs Boson in the region 100 < mH < 150 GeV are presented, based on large luminosity data samples collected by the CDF and DØ Collaborations at the Fermilab Tevatron p[`p] Collider. Observed and expected upper limits at 95% confidence level, in units of the Standard Model expectation, are presented for the production cross section × branching ratios of individual search channels as well as their combinations.
Using the full CLEO-c D0[`D]0, D+D-, and Ds[`(Ds)]* data samples, we have made precision measurements of the decay constants fD+ and fDs, and of several Cabibbo-favored and Cabibbo-suppressed D meson semileptonic branching fractions and form factors. Lattice QCD calculations of these quantities are expected to be reliable. I will compare the available Lattice QCD calculations with the CLEO experimental results.
We analyze two different theoretical models of neutrino masses which predict the existence doubly charged scalar H±±. By tracking the doubly charged scalar in colliders we find that the branching ratios of H±± into same sign dilepton and W±W± are sensitive to the value of triplet VEV vT, and also an order of eight difference between the differential cross sections in the process of single dilepton production through W-W fusion in the two scenarios. In particular, we give explicit relationships between neutrino masses and same sign dilepton decays and demonstrate that at the tribimaximal mixings, the lower bound of the lightest neutrino mass as well as the absolute neutrino masses and Majorana phases can be extracted through the measurements of the dilepton modes at colliders.
We draw attention to some tune problems in constructions of the quantum-field operators for spins 1/2 and 1. They are related to the existence of negative-energy and acausal solutions of relativistic wave equations. Particular attention is paid to the chiral theories, and to the method of the Lorentz boosts.
Current models of high energy hadron collisions typically combine perturbative QCD with an alternative phenomenological model to describe the data.These models have free parameters which must be tuned to describe the experimental data well.The goal of this study is to tune the free parameters of the PYTHIA 6 to Minimum Bias published data from CDF and ATLAS at collision energies1.9TeV and 0.9TeV respectively.The tuning procedure has been adapted from e+e- physics.First results are presented as a function of data set, proton PDFs and the fragmentation tuning.Tuning results show that the selected model, when appropriately tuned,can describe the data.At the moment these are the best parameters we have found to describe data but with the better understanding of model, tunings could be improved.
Poster Tau lepton is the heaviest and the only lepton that is able to decay into hadrons, therefore it provides a perfect tool to test the structure of the weak currents and the universality of their couplings to the gauge bosons. In the framework of the standard model, the w has both vector and axial vector components, and can couple to hadronic states with spin-parity: Jp = 0-, 0+, 1-,1+ . In the non- strange tau decays, which G-parity is conserved, the separation of vector and axial-vector components in hadronic final states, only doing directly with pions. Even number of pions (with G-parity=1) is related to vector states and odd number of pions (with G-parity=-1) is related to axial-vector states.
In this paper, widths of the some dominant ; decays are calculated and compared with experimental data of accelerators such as BABAR, ALEPH, DELPHI, FRASCATI and ORSAY.
Study of the spectrum hadronic tau decays by using the experimentally data. G. Forozani Department of Physics, Bu-Ali Sina University, Hamedan (IRAN)
Abstract: Poster The tau lepton is the heaviest and the only lepton that is able to decay into hadrons, therefore it provides a perfect tool to test the structure of the weak currents and the universality of their couplings to the gauge bosons. In the framework of the standard model, the w has both vector and axial vector components, and can be couple to hadronic states with spin-parity:
. In the non- strange tau decays, which G-parity is conserved, the separation of vector and axial-vector components in hadronic final states, can be observed directly (by) with pions. Even number of pions (with G-parity=1) are related to vector states and odd number of pions (with G-parity=-1) are related to axial-vector states. In this paper, the widths of some dominant hadronic (semi-leptonic) tau decays are calculated and compared with new experimental data of accelerators such as BABAR, ALEPH, DELPHI, FRASCATI and ORSAY. Since branching fraction ratio for two decay is equal with those decay width, by determining decay widths, we can predict precise value for ratio of branching fractions.
We report results from CAST where the magnet bores were filled with 4He gas (Phase II) of variable pressure. The introduction of gas generates a refractive photon mass, thereby achieving the maximum possible conversion rate for those axion masses ma that match mg. We have scanned masses up to about 0.4 eV, taking approximately 2 h of data for each setting. We set a typical upper limit on the axion-photon coupling of gag < 2.2 10-10 GeV-1 at 95with masses up to about 1.2 eV using 3He as a buffer gas. This paper will present the status of CAST's second phase; 3He upgrades and other system's improvements, and results of the last data taking periods.
This paper presents the status of the search for neutrinoless double beta decay. After discussing general experimental concepts, like the different proposed technological approaches and the sensitivity, the current experimental situation is briefly reviewed. The future searches are then described, providing an organic presentation which picks up similarities and differences. As a conclusion, we try to envisage what we expect round the corner and at a longer time scale.
The H.E.S.S. experiment is an array of four identical imaging atmospheric Cherenkov telescopes in the Southern hemisphere, designed to observe very high energy gamma-rays (E > 100 GeV). The annihilation of dark matter particles in large mass density astrophysical objects could produce detectable very high energy gamma-rays. The HESS collaboration has searched for a dark matter annihilation signal towards several potential targets: the Galactic Centre, dwarf spheroidal galaxies, globular clusters and speculative Intermediate Mass Black Holes. The H.E.S.S observations towards these targets will be described. In the absence of clear signals, constraints on the Dark Matter particle annihilation cross-section in several particle physics scenarios are derived.
LSST will produce one of the main large scale structure surveys of the next decades. Within this survey, the study of baryonic acoustic oscillations (BAO) that probes the accelerated expansion of the universe will be much improved. In this work, we estimate how the BAO scale will be measured with LSST as a function of redshift. We have developed simulations of mock galaxy catalogs. Starting from a power spectrum and cosmological parameters, a 3D mass distribution is generated and populated with galaxies. We compute the apparent magnitudes, the associated errors in each LSST band, and then reconstruct the photometric redshifts. The power spectrum is reconstructed in order to extract the BAO scale and constrain the dark energy parameters.
Directional detection of non-baryonic Dark Matter is a promising search strategy for discriminating genuine WIMP events from background ones. However, carrying out such a strategy requires both a precise measurement of the energy down to a few keV and 3D reconstruction of tracks down to a few mm. To achieve this goal, the MIMAC project has been developped: it is based on a gaseous micro-TPC matrix, filled with 3He, C4H10 and/or CF4. Firsts results of low energy nuclei recoils obtained with a low energy neutron field will be presented.
In the present investigation we discuss solution of the modified Dirac equation in moving in fixed direction uniform matter. This kind of environment configuration can be considered as a simplified approximation for matter flows observed near astrophysical compact objects. Previous investigations on the quasiclassical level showed that this kind of environment can be a fruitful background for new effects (including effects connected to neutrino oscillations) . To evaluate the equation we introduce spin operator, which structure appears rather non-trivial, and discuss its properties and physical meaning. On this way we obtain dispersion relation for the neutrino in moving matter and investigate it in some limiting cases. Also we give the explicit form of the equation solutions and discuss on their possible implications in neutrino physics.
LHC is delivering proton-proton collision data since march 2010. The first results concerning high-pt muons, electrons, missing energy (neutrino) and tau are shown. Events with these leptons were detected, reconstructed and analyzed very quickly by the CMS experiment. Focus on the W and Z channel is given because the understanding of the rate and characteristics of these processes will be of vital importance for the establishment of the entire CMS analysis program.
In this talk I will present the highlights of flavour violation in the SM with a sequential fourth generation. I will discuss our results on quark flavour violation namely on rare K and B decays. The important role of e¢/e in constraining the model will be discussed together with the features that set the SM4 apart from other extensions of the SM. I will also present implications on D0-[`D]0 mixing observables and LFV.
Refs: 1002.2126, 1004.4565, and Work-In-Progress
We will present the prospects for MSSM Higgs boson searches at LHC. We will discuss the sensitivity projections for ATLAS and CMS experiments for search for a neutral MSSM Higgs bosons in the pp® bb F® bbtt and pp® bb F® bbmm channels, and also for charged Higgs boson in H± ® tn and H± ® tb channels.
We combine top down and bottom approaches in the search for viable four family models with conformal high energy behavior.
Poster Motivated by a possible anomaly in the forward-backward (FB) asymmetry of top quark (AFB) observed at the Tevatron, we perform a model independent analysis on q [`q] ® t [`t] using an effective lagrangian with dim-6 four-quark operators. We derive necessary conditions on new physics structures and the couplings that are consistent with the t[`t] production cross section and AFB measured at the Tevatron, and discuss possible new physics scenarios that could generate such dim-6 operators.
Studies of constraints on a fourth fermion family usually assume that 3 ×3 unitarity holds for the first 3 generations in the neutrino sector. Only under this assumption one is able to determine the Fermi constant from the muon lifetime with the claimed precision of 10-5 GeV-2. We study how well GF can be extracted within a four generation Standard Model from leptonic and radiative m and t decays, as well as from Kl3 decays and leptonic decays of charged pions. In the combined fit we find a p-value of 2.6 % for the PMNS matrix element |Ue4|=0. In addition, we present a combined fit of the CKM and PMNS sector and emphasize the importance of a combined fit of quark and lepton flavour observables together with electroweak precision observables.
We propose that the effective dimensionality of the space we live in depends on the length scale we are probing. As the length scale increases, new dimensions open up. At short scales the space is lower dimensional; at the intermediate scales the space is three-dimensional; and at large scales, the space is effectively higher dimensional. This setup allows for some fundamental problems in cosmology, gravity, and particle physics to be attacked from a new perspective. The proposed framework, among the other things, offers a new approach to the cosmological constant problem and results in striking collider phenomenology. This abstract is based on our recent article arXiv:1003.5914.
The further development of theory of the process of spin light of neutrino is presented. Using the method of exact solutions of the modified Dirac equation the rate of the process is calculated exactly accounting for the dispersion of plasmon in dense plasma as well as for the influence of matter on the neutrino initial and final states. The corresponding results are discussed in connection with possible astrophysical and cosmological applications.
The Pierre Auger Observatory is the biggest detector ever realized for the detection of the ultra-high energy cosmic rays. The experimental technique is based on hybrid detection, consisting in the simultaneous measurement of the cosmic ray particles by two independent detectors: a surface array made of water Cherenkov tanks covering an area of about 3000 Km2 and a fluorescence detector consisting in 4 fluorescence telescopes overlooking the surface detector area. This technique permits to obtain valuable cross-checks between the two different measurements as well as an optimal control of systematics. The southern site, located in Malarg[u\ddot]e (Argentina) has been completed in 2008 and it is taking data since 2004. Latest results on the main characteristics of the detected cosmic rays as the energy spectrum, the mass composition and the search for anisotropies in arrival directions, are discussed.
Currently, a fourth generation of fermions can not be excluded, neither based on theoretical arguments nor by experimental constraints. Direct searches at LEP-II allows to exclude a heavy Dirac neutrino below 90.3 GeV and a heavy charged lepton below 100 GeV. Direct searches at the Tevatron experiments set limits of 338 GeV for the heavy b' quark and 35 GeV for the heavy t' quark. In this presentation various scenarios for fourth generation quark and lepton searches at the ATLAS experiment will be discussed. Discovery prospects and exclusion regions are studied as a function of the LHC machine performance.
T2K is the first long-baseline off-axis neutrino oscillation experiment and aims at the discovery of muon-neutrino to electron-neutrino oscillation. A non-null measurement of the q13 mixing angle would open the way to the search for CP violation in the lepton sector. The flux and spectrum of a high intensity neutrino beam from the J-PARC facility, mainly composed of muon-neutrinos, are measured both at the ND280 near detector complex, 280 m from the neutrino source, and by the Super-Kamiokande detector located 295 km from the source and 2.5 degrees off-axis. The experiment began taking data using a neutrino beam generated from 30 GeV protons in January 2010. Preliminary results from the first physics run will be presented.
The Compact Muon Solenoid detector at the LHC accelerator was extensively tested and commissioned during the years 2008 and 2009 using cosmic muons and being prepared for collision data. With the LHC start-up and the first runs at 7 TeV in the years 2009 and 2010, CMS started to record its first collision events. This data have been used to perform detailed studies on the performance of the detector, ranging from the efficiency of the data taking to the study of the first observed mass resonances. In this process, the calibration and commissioning of CMS has shown to be well advanced, and the detector prepared for the first Standard Model measurements.
LHCf is one of the six physics experiments at LHC. The LHCf detectors are located at +/-140m away from the LHC interaction point(IP1). The LHCf experiment measures the energy and transverse momentum spectra of neutral particles in the very forward region (h > 8.4) from the pp-collisions. Forward scattering of high-energy pp-collision is equivalent to the collision between primary cosmic ray and atmosphere, thus the measurement of these scattering is capable of tuning the hadron interaction simulation in which the uncertainties causes the less sensitivity of ultra high energy cosmic ray measurements. In this talk results at Ös=900GeV and 7TeV collision are presented.
We present the projections on physics beyond Standard Model except SUSY with the expected integrated luminosity of 200 pb-1 and 1 fb-1 in pp collisions at Ös = 7 TeV at the ATLAS and CMS, LHC collider experiments. Searches for new phenomena include extra Z' and W' bosons, extra dimensions, leptoquarks, excited electrons and monojets among others. The potential discovery as well as the exclusion power of the LHC in such a theories is discussed.
We revisit the recent Tevatron lower limits on the mass of the Z¢ bosons in a range of E6 GUT based models and analyze the dependence of these limits on some crucial factors contributing to the production cross-section, particularly the parton distribution functions of the ingoing quarks. We also find mass limits for Z¢ bosons appearing in certain other classes of models not previously studied and investigate the expected exclusion limits at the LHC for different luminosity reaches in some representative Z¢ models.
The Q/U Imaging ExperimenT (QUIET) is a ground-based amplifier-based CMB polarization experiment located in the Atacama desert in Chile, scanning 4 15 by 15 degree patches in the Q and W bands, at 25 < l < 1000. Telescope data is analyzed in two mostly independent processing pipelines: A Monte Carlo based pseudo-Cl-based pipeline, and a ML pipeline using the full covariance matrix for unbiased maps and exact error propagation. I will here give a description of the ML pipeline, and present preliminary results from the Q-band half of the first QUIET phase.
The Sudbury Neutrino Observatory (SNO) experiment has recently completed a high precision measurement of the total flux of 8B solar neutrinos from the first two phases of operation. These results and their implications for the mixing angles for both two and three flavour fits will be presented. In addition, future results from a combined analysis of all three phases will be discussed.
The first BESIII results will be presented. Using a sample of 106 million y(2S) and 226 million J/y events collected with the BESIII detector at the BEPCII e+e- collider, .the singlet hc(1P1) is significantly observed, and its resonance parameters are measured with higher precision, and the branching fractions for y(2S)®p0 hc and hc®ghc are the first measurements. The radiative transition y(2S)®ggJ/y, gp0,gh, gh¢ and ccJ® VV, gV(V=r,f,w) are measured. The p[`p] threshold enhancement in the J/y®gp[`p], and the X(1835) observed in J/y®gpph¢ discovered at BESII are confirmed with a high statistical significance. The accumulation of y(3770) events is on going, and the integrated luminosity of about 500 pb-1 has been achieved.
The ALICE experiment during 2009 and 2010 LHC runs has collected pp collisions at Ös = 900 GeV and Ös = 7 TeV. This provided enough statistics for detector calibration and physics analysis. In this report the current performance of the ALICE detector in terms of particle identification will be presented together with physics results with identified particles at both energies.
The long-baseline NOnA experiment is designed to observe appearance of electron neutrinos in a beam of muon neutrinos. It will use a near detector 1 km from the neutrino source to measure the beam before oscillations occur and a far detector to measure the beam after it has traveled 810 km. If the mixing angle between the first and third neutrino mass eigenstates, q13, is large enough, NOnA will measure q13 and determine the neutrino mass hierarchy. It will also provide information about the CP-violating phase, d. This talk will outline the physics goals of the experiment and the current status of its construction, including an an update on the construction of the prototype near detector. The prototype detector will go online in the summer of 2010 and will observe an off-axis neutrino beam from the NuMI beamline and an on-axis neutrino beam from the Booster beam line.
Poster In this contribution we analyze theoretically (i) the bound-state beta decay of a neutron in a strong magnetic field and (ii) the laser-assisted decay of a muon. For the first process, we show that, in contrast to the field-free situation, the decay of a neutron into a hydrogen atom and an antineutrino in the presence of a strong magnetic field plays an important role, even competing with the usual neutron decay mode. Several possible astrophysical consequences of this finding are indicated. For the second process, we demonstrate that, though some recent theoretical studies support such counterintuitive scenario, it is however unrealistic to modify notably the muon lifetime with available optical lasers. In addition, we discuss at which laser parameters (frequency and intensity) one might expect the muon lifetime to be seriously changed.
Methods adopted by CMS HCAL group for calorimeter azimuthal intercalibration and establishing absolute energy scale from LHC collision data will be described. Special triggers and data streams which were developed for that will be considered. Process of calibration procedures development with Monte-Carlo and experience with LHC collision data will be described.
Overview of first results on QCD from pp collisions at sqrt(s)=0.9 TeV, 2.36TeV and 7TeV recorded with the CMS experiment at the LHC. Underlying event study and particle production in minimum bias events will be considered. The first results on hadronic jet production will be presented, including inclusive jet spectra and jet transverse structure study.
It is now a well established fact based on several observations that we live in a Universe dominated by dark energy. Thus it becomes a pressing need to understand structure formation in the context of a dark energy dominated Universe. The most natural candidate for dark energy is the vacuum energy of fields in curved space-time. We develop the formalism to study the gravitational collapse of fields given any general potential. We then apply this formalism to models of dark energy motivated by particle physics considerations.
Recent results on QCD physics from the D0 and CDF detectors are presented in this talk. Results discussed include the measurement of tri-jet mass states, multi-jet production, and the production of photons and photons plus vector bosons.
A review on neutrino electromagnetic properties is given. The problem of the neutrino form factors (in particular, the neutrino electric charge form factor and charge radius, dipole magnetic and electric and anapole form factors) definition and calculation within different gauge models is considered. The neutrino magnetic (diagonal and transition) moments in the Standard Model and beyond are discussed in detail. Available experimental constraints on neutrino electromagnetic properties and the most recent experimental limits on neutrino magnetic moments are also reviewed. The important neutrino electromagnetic processes involving neutrino couplings with photons and possible astrophysical and cosmological applications are discussed.
1. C.Giunti and A.Studenikin: "Neutrino electromagnetic properties", Phys.Atom.Nucl. 72 (2009) 2151-2187, arXive:0812.3646v5 (April 14, 2010) . 2. C.Giunti, A.Studenikin, Ëlectromagnetic properties of neutrinos", J.Phys.: Conference Series 203 (2010) 012100 . 3. A.Studenikin, "Neutrino magnetic moment: a window to new physics", Nucl.Phys. B (Proc. Suppl.) 188 (2009) 220.
We study the dynamical evolution of cosmological models with the R-W symmetry with a scalar field non-minimally coupled to gravity and barotropic matter. For this aim we use dynamical system methods. We have found a generic type of trajectories which interpolate between a cosmological singularity of finite time, inflation, radiation and matter dominating epoch and accelerated phase expansion of the Universe. We point out importance of finding the new solution called twister solution because of the shape of trajectory in the phase space. We also estimate the model parameter using the astronomical data and comparing the model with the concordance LCDM one. We show using the Bayesian framework that the new model in the light of admissible data is as good as the LCDM model.
Precision cosmology and big-bang nucleosynthesis tend to favor extra radiation in the universe beyond photons and ordinary neutrinos. Viable candidates for extra-radiation are low-mass sterile neutrinos. We use the WMAP 7-year data release, small-scale CMB observations from ACBAR, BICEP and QuAD, the 7th data release of the Sloan Digital Sky Survey, and measurement of the Hubble parameter from Hubble Space Telescope observations to derive credible regions for the effective mass ms and the effective number Ns of termally excited sterile neutrino stases. Our results are compatible with the MiniBooNE latest ones.
The results of numerical simulations of light curves and spectra and the influence of special relativity effects at the epoch of type Ib/c and SN1987A supernova shock breakout are considered. Prospects for using the numerical simulation results to analyze and interpret available and future data from the space observatories are discussed. The results are important for the theory of core-collapse supernovae and applications in cosmology.
An effect generated by the nonexponential behavior of the survival amplitude of an unstable state in the long time region is considered. We analyze the instantaneous energy of the unstable state and we find that this energy tends to the minimal energy of the system Emin as t®¥ which is much smaller than the energy of this state for t of the order of its lifetime. Analyzing the transition time region between exponential and non-exponential form of the survival amplitude we find that the instantaneous energy of the unstable state can take large values, much larger than the energy of this state for t from the exponential time region. Taking into account results obtained for a model considered, it is hypothesized that this purely quantum mechanical effect may be responsible for the properties of broad resonances such as s meson as well as having astrophysical and cosmological consequences.
The ANTARES telescope is the largest underwater neutrino telescope existing at present. It is based on the detection of Cherenkov light produced in sea water by neutrino-induced muons. The detector, consisting of a tri-dimensional array of 885 photomultipliers arranged on 12 vertical lines, is located at a depth of 2475 m in the Mediterranean Sea, 40 km off the French coast. It is sensitive to neutrinos in an energy range from 50 GeV up to 1 PeV, and it has an effective area for upward muon detection which reaches 0.05 km2 at the highest energies.
The main goal of the experiment is to probe the Universe by means of neutrino events in an attempt to investigate the nature of high energy astrophysical sources, to contribute to the identification of cosmic ray sources, and to explore the nature of dark matter.
In this talk we will review the status of the detector, illustrate its operation and performance, and present the first results from the analyses carried out on atmospheric muons and neutrinos, as well as from the search for astrophysical neutrino sources.
The LHCb experiment has started its data taking phase and already collected the first B-meson candidates. In the next months it will accumulate higher numbers of such events than previously recorded by any other experiment. This is a unique opportunity for the study of B rare decays and the search for effects of physics beyond the Standard Model, which might contribute to processes such as Bs ® m+m-, Bd ® K*0m+m- and Bs ® fg. We will describe how early LHCb data is used to validate analysis strategies, what is the expected precision to be achieved, and in consequence what is the feasibility to provide a clear signature of New Physics from rare decays with the data expected in the 2010-11 run.
If really such objects like cosmological black holes exist they may be studied with a standard technique like strong and weak gravitational lensing. Cosmological voids can be explained as the result the collapse of large perturbations into black hole with masses of the order of 1014M\odot and the expansion of the universe. The resulting image of the universe is that it is more homogeneous than expected from present observations. In this paper we discuss some lensing properties related to the CBHs.
High intense Laser interaction with matter is described as new phenomena during the last twenty years. Femtosecond time duration is interested to transfer high power in interaction with matter and plasma.[1-3] Recently, Attosecond technique is a new method that used in the fast atomic scales measurement. [4-6]
In normal condition, Electrons are confined by coulomb potential in atom. By using the high intense femtosecond laser field, a time-dependent force on the bound electron could be exerted. In the large produced force, the electron can tunnel from the atom. This splits the electron and the attraction of the negative electron to the positive ion rapidly decreases so electron escapes the ion. In fact, electrical field of the light pushes the wave packet away from the ion firstly, but by reversing the field direction, the force cause to come back the electron. [7-11]
The times of recollision could be synchronized by laser pulse and it can be of attosecond precision. In this work we have described the energy difference of recoiled electron before and after collision. The EM Attosecond generated pulse has investigated in frequency domain. It is demonstrated major effective parameters for control of shape and intensity in attosecond phenomena.
Terahertz applications such as biological sensing, imaging, surface chemistry and high field condensed matter studies cause to propose the source of this radiation over the last decade. [1-6] Various schemes based on optical rectification, Quantum cascade intersubband, photoconductive antenna, Varactor Frequency Doublers, synchrotron radiation and est. are used to generate terahertz radiation. [7-11] Electromagnetically Induced Transparency in an Ideal Plasma was demonstrated by harris. Recently, the terahertz radiation via an electromagnetically induced transparency at ion acoustic frequency region with laser-produced dense plasmas is reported by Nakagawa.  In this work, we consider the interaction of a high intensity laser pulse with dense plasma. By using the ion hydrodynamic equations and The Maxwell's equations, ion density variation is obtained that could be demonstrated terahertz power. This new achievement can optimized the power of generated Thz in ion acoustic frequency region.
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On 13 Jul 2010, 18:23.