0000000000477012

AUTHOR

R. Barlow

showing 4 related works from this author

Search for Production of Invisible Final States in Single-Photon Decays of Υ(1S)

2010

We search for single-photon decays of the Upsilon(1S) resonance, Upsilon->gamma+invisible, where the invisible state is either a particle of definite mass, such as a light Higgs boson A0, or a pair of dark matter particles, chi chi-bar. Both A0 and chi are assumed to have zero spin. We tag Upsilon(1S) decays with a dipion transition Upsilon(2S)->pi+pi-Upsilon(1S) and look for events with a single energetic photon and significant missing energy. We find no evidence for such processes in the mass range m_A0<=9.2 GeV and m_chi<=4.5 GeV in the sample of 98e6 Upsilon(2S) decays collected with the BaBar detector and set stringent limits on new physics models that contain light dark ma…

Particle physicsPhotonAstrophysics::High Energy Astrophysical PhenomenaPhysics beyond the Standard ModelElectron–positron annihilationDark matterFOS: Physical sciencesGeneral Physics and Astronomy01 natural sciencesResonance (particle physics)High Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)PACS: 13.20.Gd 12.60.Jv 14.80.Da 95.35.+d0103 physical sciencessingle-photon decays of Upsilon(1S)[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsLight dark matterPhysicsMissing energy010308 nuclear & particles physicsParticle physicsBABAR detectorHEPBaBarHiggs bosonHigh Energy Physics::ExperimentFísica de partículesExperimentsBaBar detector at SLAC
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Measurement of CP asymmetry in Bs0 → Ds ∓K± decays

2014

Journal of high energy physics 2018(3), 59 (2018). doi:10.1007/JHEP03(2018)059

B physicCKM angle gamma01 natural sciencesB physicsLuminosityFlavor physicsHadron-Hadron scattering (experiments)TOOLLHCb - Abteilung HintonQCmedia_commonPhysicsParticle physicsCharge conjugation parity time reversal and other discrete symmetrie12.15.HhB physics; CKM angle gamma; CP violation; Flavor physics; Hadron-Hadron ScatteringJustice and Strong InstitutionsCP violationB physics; CKM angle gamma; CP violation; Flavor physics; Hadron-Hadron Scattering; Nuclear and High Energy PhysicsFísica nuclearLHCAstrophysics::Earth and Planetary AstrophysicsParticle physicsNuclear and High Energy PhysicsVIOLATIONSDG 16 - PeaceVIOLATION; GAMMA; TOOLAstrophysics::High Energy Astrophysical Phenomenamedia_common.quotation_subject14.40.NdLHCb - Abteilung HofmannAstrophysics::Cosmology and Extragalactic AstrophysicsHadrons530Determination of Cabibbo-Kobayashi & Maskawa (CKM) matrix elementAsymmetryNOHadronic decays of bottom mesonTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY0103 physical scienceslcsh:Nuclear and particle physics. Atomic energy. Radioactivityddc:530010306 general physicsLarge Hadron Collider (France and Switzerland)Astrophysics::Galaxy AstrophysicsHadron-Hadron Scattering010308 nuclear & particles physicsSDG 16 - Peace Justice and Strong InstitutionsGran Col·lisionador d'HadronsGAMMA/dk/atira/pure/sustainabledevelopmentgoals/peace_justice_and_strong_institutionsHEPLHCbFlavor physic13.25.HwB physics; CKM angle gamma; CP violation; Flavor physics; Hadron-Hadron scattering (experiments)lcsh:QC770-798Bottom mesons (|B|>0)11.30.ErHigh Energy Physics::ExperimentB physics CKM angle gamma CP violation Flavor physics Hadron-Hadron ScatteringFísica de partículesExperiments
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Observation of $Z$ production in proton-lead collisions at LHCb

2014

The first observation of $Z$ boson production in proton-lead collisions at a centre-of-mass energy per proton-nucleon pair of $\sqrt{s_{NN}}=5~\text{TeV}$ is presented. The data sample corresponds to an integrated luminosity of $1.6~\text{nb}^{-1}$ collected with the LHCb detector. The $Z$ candidates are reconstructed from pairs of oppositely charged muons with pseudorapidities between 2.0 and 4.5 and transverse momenta above $20~\text{GeV}/c$. The invariant dimuon mass is restricted to the range $60-120~\text{GeV}/c^2$. The $Z$ production cross-section is measured to be \begin{eqnarray*} ��_{Z\to��^+��^-}(\text{fwd})&=&13.5^{+5.4}_{-4.0}\text{(stat.)}\pm1.2\text{(syst.)}~\text{nb} …

14.70.Hp - Z bosonProtonNuclear Theory01 natural sciencesPhysics Particles & FieldsHigh Energy Physics - ExperimentSettore FIS/04 - Fisica Nucleare e SubnucleareLuminosityHigh Energy Physics - Experiment (hep-ex)Heavy-ion collision[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]Electroweak interaction; Forward physics; Heavy Ions; Heavy-ion collision; Particle and resonance productionElectroweak interactionHeavy IonsHeavy IonNuclear ExperimentQCBosonPhysics25.75.Dw - Relativistic heavy-ion collisions: Particle and resonance production; 14.70.Hp - Z bosons; 13.38.Dg - Decays of Z bosons; 12.15.-y - Electroweak interactionsPhysicsHIGH ENERGIES12.15.-y - Electroweak interactionsParticle physicsComputer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing)13.38.Dg - Decays of Z bosons25.75.Dw - Relativistic heavy-ion collisions: Particle and resonance productionPhysical SciencesPARTON DISTRIBUTIONS; BOSON PRODUCTION; HIGH ENERGIES; NUCLEAR PDFS; DEUTERIUM; DECAYFísica nuclearProduction (computer science)14.70.Hp - Z bosonsParticle Physics - ExperimentNuclear and High Energy PhysicsParticle physicsNUCLEAR PDFS530 PhysicsDEUTERIUMFOS: Physical sciencesPhysics InstituteLHCb - Abteilung HofmannHadronsParticle and resonance production0103 physical sciencesElectroweak interaction; Forward physics; Heavy Ions; Heavy-ion collision; Particle and resonance production; Nuclear and High Energy PhysicsSDG 7 - Affordable and Clean Energy010306 general physicsForward physicLarge Hadron Collider (France and Switzerland)BOSON PRODUCTION/dk/atira/pure/sustainabledevelopmentgoals/affordable_and_clean_energyScience & TechnologyMuon010308 nuclear & particles physicshep-exComputer Science::Information RetrievalGran Col·lisionador d'Hadrons13.38.Dg - Decays of Z bosonPARTON DISTRIBUTIONSForward physicsHigh Energy Physics::ExperimentFísica de partículesExperimentsDECAYEnergy (signal processing)JHEP
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Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb

2013

Searches for the lepton flavour violating decay tau(-) -> mu(-)mu(+)mu(-) and the lepton flavour and baryon number violating decays tau(-) -> (p) over bar mu(+)mu(-) and tau(-) -> p mu(-)mu(-) have been carried out using proton-proton collision data, corresponding to an integrated luminosity of 1.0 fb(-1), taken by the LHCb experiment at root s = 7 TeV. No evidence has been found for any signal, and limits have been set at 90% confidence level on the branching fractions: B(tau(-) -> mu(-)mu(+)mu(-) mu(+)mu(-)) p mu(-)mu(-)) (p) over bar mu(+)mu(-) and tau(-) -> p mu(-)mu(-) decay modes represent the first direct experimental limits on these channels.

Nuclear and High Energy PhysicsParticle physicsFlavourDecays of leptons; Global symmetries (e.g. baryon number lepton number); 13.35.-r; 11.30.Fs;FOS: Physical sciences01 natural sciencesPartícules (Física nuclear)High Energy Physics - ExperimentSettore FIS/04 - Fisica Nucleare e SubnucleareNuclear physicslepton number)High Energy Physics - Experiment (hep-ex)Violació CP (Física nuclear)0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]LHC flavour physics lepton number11.30.FsNeutrinsNeutrinos010306 general physicsParticles (Nuclear physics)Physics13.35.-rDecays of leptonsLarge Hadron Collider010308 nuclear & particles physicsGlobal symmetries (e.g. baryon number lepton number)Leptons (Física nuclear)Global symmetries (e.g.High Energy Physics::Phenomenologybaryon numberDecays of lepton3. Good healthFIS/01 - FISICA SPERIMENTALELeptons (Nuclear physics)Física nuclearHigh Energy Physics::ExperimentBaryon numberNeutrino11.30.FFIS/04 - FISICA NUCLEARE E SUBNUCLEAREParticle Physics - ExperimentLeptonCP violation (Nuclear physics)Physics Letters B
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