Measurement of the ${\chi }_b(3P)$ mass and of the relative rate of ${\chi }_{b1}(1P)$ and ${\chi }_{b2}(1P)$ production

Abstract

The production of ${\chi }_b$ mesons in proton-proton collisions is studied using a data sample collected by the LHCb detector, at centre-of-mass energies of $\sqrt{s}=7$ and $8$ TeV and corresponding to an integrated luminosity of 3.0 fb${}^{-1}$. The ${\chi }_b$ mesons are identified through their decays to ${\rm Y}(1S)\gamma$ and ${\rm Y}(2S)\gamma$ using photons that converted to $e^{+}{e}^{-}$ pairs in the detector. The relative prompt production rate of ${\chi }_{b1}(1P)$ and ${\chi }_{b2}(1P)$ mesons is measured as a function of the ${\rm Y}(1S)$ transverse momentum in the ${\chi }_b$ rapidity range $2.0<y<4.5$. A precise measurement of the ${\chi }_b(3P)$ mass is also performed. Assuming a mass splitting between the ${\chi }_{b1}(3P)$ and the ${\chi }_{b2}(3P)$ states of 10.5 MeV/$c^2$, the measured mass of the ${\chi }_{b1}(3P)$ meson is $m({\chi }_{b1}(3P))=10515.7_{-3.9}^{+2.2}(stat{)}_{-2.1}^{+1.5}(syst)MeV/c^2.$

References in corpus (8)

• PYTHIA 6.4 Physics and Manual
• QCD corrections to J/psi and Upsilon production at hadron colliders
• On the mechanisms of heavy-quarkonium hadroproduction
• QCD radiative corrections to ${\chi }_{cJ}$ production at hadron colliders
• Measurement of the relative prompt production rate of chi(c2) and chi(c1) in pp collisions at sqrt(s) = 7 TeV
• Production of the Charmonium States chic_1 and chic_2 in Proton Nucleus Interactions at sqrt{s} = 41.6 GeV
• Production of ${\chi }_b$-mesons at LHC
• Measurement of the production cross section ratio sigma(chi[b2](1P)) / sigma(chi[b1](1P)) in pp collisions at sqrt(s) = 8 TeV

Cited by in corpus (26)

• Bottomonium Mesons and Strategies for Their Observation
• Bottomonium spectrum revisited
• Measurement of the B+/- meson nuclear modification factor in PbPb collisions at sqrt(s[NN]) = 5.02 TeV
• Spectrum and electromagnetic transitions of bottomonium
• Measurement of quarkonium production cross sections in pp collisions at $\sqrt{s}=$ 13 TeV
• Production and polarization of prompt $J/\psi$ in the improved color evaporation model using the $k_T$-factorization approach
• Forward production of ${\rm Y}$ mesons in $pp$ collisions at $\sqrt{s}=7$ and 8TeV
• An Updated Study for ${\rm Y}$ Production and Polarization at the Tevatron and LHC
• Bottomonium spectrum in the relativistic flux tube model
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Observation of the ${\chi }_{b1}$(3P) and ${\chi }_{b2}$(3P) and measurement of their masses
• Measurement of the production cross section ratio sigma(chi[b2](1P)) / sigma(chi[b1](1P)) in pp collisions at sqrt(s) = 8 TeV
• $X(3872)$, $X_b$, and the ${\chi }_{b1}(3P)$ state
• Measurement of the ${\rm Y}$ polarizations in $pp$ collisions at $\sqrt{s}$=7 and 8TeV
• Production and polarization of prompt ${\rm Y}$($n$S) in the improved color evaporation model using the $k_T$-factorization approach
• Radial and orbital Regge trajectories in heavy quarkonia
• Free-form smearing for bottomonium and B meson spectroscopy
• ${\chi }_b(3P)$ Multiplet Revisited: Ultrafine Mass Splitting and Radiative Transitions
• Bottomonium spectrum with a Dirac potential model in the momentum space
• Hindered magnetic dipole transitions between P-wave bottomonia and coupled-channel effects
• Observation of orbitally excited $B_c^{+}$ states
• Properties of bottomonium in a relativistic quark model
• Study of $B_c(1P{)}^{+}$ states in the $B_c^{+}\gamma$ mass spectrum
• Spectroscopy of higher bottomonia
• Beauty Hadron Spectrum in a Screened Potential Model
• Quarkonium production in pNRQCD: the $P$-wave case