Observation of the ${\chi }_{b1}$(3P) and ${\chi }_{b2}$(3P) and measurement of their masses

Abstract

The ${\chi }_{b1}$(3P) and ${\chi }_{b2}$(3P) states are observed through their ${\rm Y}$(3S) $\gamma$ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb${}^{-1}$. The ${\rm Y}$(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e${}^{+}$e${}^{-}$ pairs in the silicon tracker, leading to a ${\chi }_{\mathrm{b}}$(3P) mass resolution of 2.2 MeV. This is the first time that the $J=$ 1 and 2 states are well resolved and their masses individually measured: 10513.42 $\pm$ 0.41 (stat) $\pm$ 0.18 (syst) MeV and 10524.02 $\pm$ 0.57 (stat) $\pm$ 0.18 (syst) MeV; they are determined with respect to the world-average value of the ${\rm Y}$(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 $\pm$ 0.64 (stat) $\pm$ 0.17 (syst) MeV.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-17-008 (CMS Public Pages)

References in corpus (41)

• An Introduction to PYTHIA 8.2
• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Observation of a New Narrow Charmonium State in Exclusive B+-->K+ pi+pi- J/psi Decays
• Observation of a narrow charmonium-like state in exclusive B+ -> K+ pi+pi- J/psi decays
• Heavy quarkonium: progress, puzzles, and opportunities
• Multiquark Resonances
• The CMS trigger system
• Potential NRQCD: an effective theory for heavy quarkonium
• Effective field theories for heavy quarkonium
• QCD and strongly coupled gauge theories: challenges and perspectives
• Charmonium levels near threshold and the narrow state $X(3872) \to π^{+}π^{-}\jpsi$
• Multiquark States
• New states above charm threshold
• Bottomonium Mesons and Strategies for Their Observation
• The QCD Potential at $O(1/m)$
• Fragmentation, NRQCD and NNLO Factorization Analysis in Heavy Quarkonium Production
• Bottomonium spectrum revisited
• Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS
• Higher mass bottomonia
• Quark structure of the $X(3872)$ and ${\chi }_b(3P)$ resonances
• Fragmentation, Factorization and Infrared Poles in Heavy Quarkonium Production
• A New Hadron Spectroscopy
• Fragmentation contributions to hadroproduction of prompt $J/\psi$, ${\chi }_{cJ}$, and $\psi (2S)$ states
• Spectrum and electromagnetic transitions of bottomonium
• Bottomonium Spectrum with Screened Potential
• Measurement of the relative prompt production rate of chi(c2) and chi(c1) in pp collisions at sqrt(s) = 7 TeV
• Coupled-Channel Effects for the Bottomonium with Realistic Wave Functions
• NRQCD Factorization and Velocity-dependence of NNLO Poles in Heavy Quarkonium Production
• Observation of a narrow mass state decaying into Upsilon(1S) + gamma in ppbar collisions at sqrt(s) = 1.96 TeV
• Bottomonium Spectrum with Coupled-Channel Effects
• Measurement of the ${\chi }_b(3P)$ mass and of the relative rate of ${\chi }_{b1}(1P)$ and ${\chi }_{b2}(1P)$ production
• 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
• Study of ${\chi }_b$ meson production in pp collisions at $\sqrt{s}=7$ and 8TeV and observation of the decay ${\chi }_b\to {\rm Y}(3S)\gamma$
• Quarkonium production at the LHC: a phenomenological analysis of surprisingly simple data patterns
• Quarkonium production at the LHC: a data-driven analysis of NRQCD's predictions
• From identical S- and P-wave pT/M spectra to maximally distinct polarizations: probing NRQCD with chi states
• Chi_b(3P) splitting predictions in potential models
• Universal kinematic scaling as a probe of factorized long-distance effects in high-energy quarkonium production
• Bottomonium states versus recent experimental observations in the QCD-inspired potential model
• Three-loop Static QCD Potential in Heavy Quarkonia

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• Study of doubly heavy tetraquarks in Lattice QCD
• New Observables in Inclusive Production of Quarkonia
• Precise predictions of charmed-bottom hadrons from lattice QCD
• Mesons with Beauty and Charm: New Horizons in Spectroscopy
• Threshold corrections of ${\chi }_{\mathrm{c}}(2P)$ and ${\chi }_{\mathrm{b}}(3P)$ states and $J/\psi \rho$ and $J/\psi \omega$ transitions of the $X(3872)$ in a coupled-channel model
• Fully-heavy structures in the invariant mass spectrum of $J/\psi \psi (3686)$, $J/\psi \psi (3770)$, $\psi (3686)\psi (3686)$, and $J/\psi {\rm Y}(1S)$ at hadron colliders
• Prospects for quarkonium studies at the high-luminosity LHC
• ${\chi }_b(3P)$ Multiplet Revisited: Ultrafine Mass Splitting and Radiative Transitions
• Are the XYZ states unconventional states or conventional states with unconventional properties?
• Bottomonium spectrum with a Dirac potential model in the momentum space
• Perspectives and Outlook from HEP Window on the Universe
• Quark structure of the $X(4500)$, $X(4700)$ and ${\chi }_{\mathrm{c}}(4P,5P)$ states
• Predictions for Bottomonium from a Relativistic Screened Potential Model
• Beauty Hadron Spectrum in a Screened Potential Model
• First exclusive reconstruction of the B${}^{\ast +}$, B${}^{\ast 0}$, and B${}_{\text{s}}^{\ast 0}$ mesons and precise measurement of their masses
• Highlights from the Compact Muon Solenoid (CMS) Experiment