Search results for "Beam direction"

showing 4 items of 4 documents

Measurement of branching fractions and charge asymmetries for exclusive B decays to charmonium

2005

We report measurements of branching fractions and charge asymmetries of exclusive decays of neutral and charged B mesons into two-body final states containing a charmonium state and a light strange meson. The charmonium mesons considered are J/Psi, Psi(2S) and Chi_c1, and the light meson is either K or K*. We use a sample of about 124 million BBbar events collected with the BABAR detector at the PEP-II storage ring at the Stanford Linear Accelerator Center.

Molecular dynamicElectron–positron annihilationHigh Energy Physics::LatticeBABARNuclear TheoryGeneral Physics and Astronomy01 natural sciences13.25.Hw 11.30.Er 12.15.HhElectron positronlaw.inventionHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)Mathematical modellawB mesons; charm particles; chi mesons; kaon production; meson hadronic decay; psi mesons[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PEP2B mesonNuclear ExperimentConstraint theorymedia_commonPhysicsAnnihilationEnergy dissipationSettore FIS/01 - Fisica SperimentaleQuarkonium strange mesonParticle physicsMESONSpair production [B]PARTICLE PHYSICSBranching fractionSLACOptimizationParticle physicsSiliconMesonmedia_common.quotation_subjectFOS: Physical sciencesCharged particleAnnihilationAsymmetryPARTICLE PHYSICS; PEP2; BABARNuclear physics0103 physical sciencesbranching ratio [B0]Colliding beamsMESONS; BABAR; SLACBeam directionResistive plate chambers (RPC)010306 general physicshadronic decay [B]Calorimeter010308 nuclear & particles physicsBranching fractionHigh Energy Physics::PhenomenologyParticle acceleratorHEPbranching ratio [B+]Quantum theoryElectromagnetic calorimeters (EMC)High Energy Physics::ExperimentFísica de partículesExperimentsStorage ring
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Searching for hidden sectors in multiparticle production at the LHC

2016

Most signatures of new physics in colliders have been studied so far on the transverse plane with respect to the beam direction. In this work however we study the impact of a hidden sector beyond the Standard Model (SM) on inclusive (pseudo)rapidity correlations and moments of the multiplicity distributions, with special emphasis in the LHC results.

Nuclear and High Energy PhysicsFactorialParticle physicsPhysics beyond the Standard ModelMultihadron correlationsFOS: Physical sciencesFactorial and cumulant moments01 natural sciencesHigh Energy Physics - Phenomenology (hep-ph)pp interactions at LHC0103 physical sciencesProduction (economics)RapidityStatistical physics010306 general physicsCumulantParticle Physics - PhenomenologyPhysicsLarge Hadron Collider010308 nuclear & particles physicsFísicaMultiplicity (mathematics)Hidden Valley modelslcsh:QC1-999Hidden sectorHigh Energy Physics - PhenomenologyTransverse planeMoment (physics)Beam directionPhysics::Accelerator PhysicsModels beyond the Standard Modellcsh:PhysicsNuclear and Particle Physics Proceedings
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Hydrodynamic simulation of elliptic flow

1999

We use a hydrodynamic model to study the space-time evolution transverse to the beam direction in ultrarelativistic heavy-ion collisions with nonzero impact parameters. We focus on the influence of early pressure on the development of radial and elliptic flow. We show that at high energies elliptic flow is generated only during the initial stages of the expansion while radial flow continues to grow until freeze-out. Quantitative comparisons with SPS data from semiperipheral Pb+Pb collisions suggest the applicability of hydrodynamical concepts already $\approx$ 1 fm/c after impact.

PhysicsNuclear and High Energy PhysicsNuclear TheoryElliptic flowFOS: Physical sciencesMechanicsNuclear Theory (nucl-th)Transverse planeNuclear Physics - TheoryBeam directionRadial flowDevelopment (differential geometry)Focus (optics)Nuclear Experiment
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The radiative return at small angles: virtual corrections

2002

Virtual corrections for electron--positron annihilation into one real and one off-shell photon of invariant mass Q^2 are evaluated. Special attention is paid to those configurations where the real photon is collinear with the beam direction. This calculation is an important ingredient of a Monte Carlo program, which simulates events with tagged photons from initial-state radiation, including NLO corrections.

PhysicsParticle physicsAnnihilationPhotonPhysics and Astronomy (miscellaneous)Monte Carlo methodFísicaFOS: Physical sciencesRadiationComputational physicsHigh Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Radiative transferBeam directionInvariant massEngineering (miscellaneous)Particle Physics - Phenomenology
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