1,560 research outputs found

    Results on ultra-peripheral interactions in Pb-Pb and p-Pb collisions in ALICE

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    Ultra-relativistic heavy ions generate strong electromagnetic fields which offer the possibility to study Îł\gamma-nucleus and Îł\gamma-proton interactions at the LHC in the so called ultra-peripheral collisions (UPC). Here we report ALICE results on J/psi photoproduction measured in Pb-Pb collisions at sNN\sqrt{s_{\rm NN}} = 2.76 TeV and in p-Pb collisions at sNN\sqrt{s_{\rm NN}} = 5.02 TeV.Comment: Presented at EDS Blois 2013 (arXiv:1309.5705

    Study of neutrino induced upgoing muon energy

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    An estimate of the energy of neutrino-induced muons in MACRO is provided by a multiple Coulomb scattering measurement. The MACRO original upward-muon data sample has been subdivided according to the reconstructed muon energy. The results are interpreted in terms of neutrino oscillation

    NOE: a neutrino experiment for the CERN-Gran Sasso Long Base line project

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    The project of a large underground experiment (NOE) devoted to long baseline neutrino oscillation measurement is presentedComment: 7 pages, 9 figures, Talk at 5th International Workshop on Tau Lepton Physics (TAU98), To be published in Nucl. Phys. B, Proc. Supp

    Review of Cosmic Ray experiments with underground detectors

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    The most important underground detectors addressing Cosmic Ray physics are described, with a special emphasis on the description of the used technology.Comment: Invited talk at 6th International Conference on advanced Technology and Particle Physics, Villa Olmo, Como, Italy, October 5-9, 1998, To be published in Nucl. Phys. B, Proc. Supp

    Performance of a large limited streamer tube cell in drift mode

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    The performance of a large (3x3 cm2cm^2) streamer tube cell in drift mode is shown. The detector space resolution has been studied using cosmic muons crossing an high precision silicon telescope. The experimental results are compared with a GARFIELD simulation.Comment: 18 pages, 7 figures. Accepted by Nucl. Instr. and Methods

    The Physics of Ultraperipheral Collisions at the LHC

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    We discuss the physics of large impact parameter interactions at the LHC: ultraperipheral collisions (UPCs). The dominant processes in UPCs are photon-nucleon (nucleus) interactions. The current LHC detector configurations can explore small xx hard phenomena with nuclei and nucleons at photon-nucleon center-of-mass energies above 1 TeV, extending the xx range of HERA by a factor of ten. In particular, it will be possible to probe diffractive and inclusive parton densities in nuclei using several processes. The interaction of small dipoles with protons and nuclei can be investigated in elastic and quasi-elastic J/ψJ/\psi and ΄\Upsilon production as well as in high tt ρ0\rho^0 production accompanied by a rapidity gap. Several of these phenomena provide clean signatures of the onset of the new high gluon density QCD regime. The LHC is in the kinematic range where nonlinear effects are several times larger than at HERA. Two-photon processes in UPCs are also studied. In addition, while UPCs play a role in limiting the maximum beam luminosity, they can also be used a luminosity monitor by measuring mutual electromagnetic dissociation of the beam nuclei. We also review similar studies at HERA and RHIC as well as describe the potential use of the LHC detectors for UPC measurements.Comment: 229 Pages, 121 figure
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