0000000001189072

AUTHOR

H.m. Wark

showing 2 related works from this author

Study of J/ψ Production in Jets

2017

The production of $J/\psi$ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the $J/\psi$ meson, $z \equiv p_{\rm T}(J/\psi)/p_{\rm T}({\rm jet})$, is measured using jets with $p_{\rm T}({\rm jet}) > 20$ GeV in the pseudorapidity range $2.5 < \eta({\rm jet}) < 4.0$. The observed $z$ distribution for $J/\psi$ mesons produced in $b$-hadron decays is consistent with expectations. However, the results for prompt $J/\psi$ production do not agree with predictions based on fixed-order non-relativistic QCD. This is the first measurement o…

13000 GeV-cmsQuantum chromodynamics: Experimental testNuclear TheoryGeneral Physics and Astronomy01 natural sciences7. Clean energytransverse momentum [jet]Settore FIS/04 - Fisica Nucleare e SubnucleareHigh Energy Physics - ExperimentParticle production Quantum chromodynamicsddc:550scattering [p p][PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]LHCb - Abteilung HintonParticle productionNuclear ExperimentQuantum chromodynamicsPhysicsJet (fluid)Large Hadron Collider02 Physical SciencesHadron-induced high- and super-high-energy interactions (energy > 10 GeV): Inclusive production with identified hadronParticle physicsQuarkoniumPROMPTJ/psi mesonLeptonic semileptonic and radiative decays of J/ψ Υ and other quarkoniaCERN LHC Collhadroproduction [J/psi(3100)]Pseudorapidityrapidity [jet]root S=7 TEVPhysical SciencesLHCcolliding beams [p p]Particle Physics - ExperimentParticle physicsGeneral PhysicsMesonPSI(2S)Astrophysics::High Energy Astrophysical PhenomenaPhysics Multidisciplinarynonrelativistic [quantum chromodynamics]OCTET QUARKONIA PRODUCTIONNOJets in large-Q2 scatteringNuclear physicsOctet quarkonia production PP collision root S=7 TEV PSI(2S) physics prompt decayPHYSICSPhysics and Astronomy (all)OCTET QUARKONIA PRODUCTION; PP COLLISIONS; ROOT-S=7 TEV; PSI(2S); PHYSICS; PROMPT; DECAY0103 physical sciencesRapiditySDG 7 - Affordable and Clean Energy010306 general physics/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energyScience & TechnologyPP COLLISIONSROOT-S=7 TEV010308 nuclear & particles physicsPP collisionhep-exHigh Energy Physics::PhenomenologyLHC-BHEPLHCbHigh Energy Physics::ExperimentHeavy quarkoniaFísica de partículesExperimentsDECAYQuantum chromodynamicsexperimental results
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First study of the CP-violating phase and decay-width difference in Bs0→ψ(2S)ϕ decays

2016

A time-dependent angular analysis of Bs0→ψ(2S)ϕ decays is performed using data recorded by the LHCb experiment. The data set corresponds to an integrated luminosity of 3.0fb−1 collected during Run 1 of the LHC. The CP-violating phase and decay-width difference of the Bs0 system are measured to be ϕs=0.23−0.28+0.29±0.02rad and ΔΓs=0.066−0.044+0.041±0.007ps−1, respectively, where the first uncertainty is statistical and the second systematic. This is the first time that ϕs and ΔΓs have been measured in a decay containing the ψ(2S) resonance.

PhysicsNuclear and High Energy PhysicsParticle physicsLarge Hadron ColliderLuminosity (scattering theory)010308 nuclear & particles physicsPhase (waves)Astrophysics01 natural sciencesResonance (particle physics)Angular distribution0103 physical sciencesCP violation010306 general physicsPhysics Letters B
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