Observation of a Peaking Structure in the $J/\psi \phi$ Mass Spectrum from $B^{\pm} \to J/\psi \phi K^{\pm}$ Decays - INSPIRE

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Observation of a Peaking Structure in the $J/\psi \phi$ Mass Spectrum from $B^{\pm} \to J/\psi \phi K^{\pm}$ Decays

CMS

Collaboration

Sep 26, 2013

21 pages

Published in:

Phys.Lett.B 734 (2014) 261-281

Published: Jun 27, 2014

e-Print:

1309.6920 [hep-ex]

DOI:

10.1016/j.physletb.2014.05.055

PDG:

{{\mathit \chi}_{{{c1}}}{(4140)}}

\rightarrow

{{\mathit J / \psi}}{{\mathit \phi}}

Report number:

CMS-BPH-11-026,
CERN-PH-EP-2013-167

Experiments:

CERN-LHC-CMS

View in:

reference search210 citations

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Abstract: (Elsevier)

A peaking structure in the J/ψϕ mass spectrum near threshold is observed in B±→J/ψϕK± decays, produced in pp collisions at s=7 TeV collected with the CMS detector at the LHC. The data sample, selected on the basis of the dimuon decay mode of the J/ψ , corresponds to an integrated luminosity of 5.2 fb −1 . Fitting the structure to an S -wave relativistic Breit–Wigner lineshape above a three-body phase-space nonresonant component gives a signal statistical significance exceeding five standard deviations. The fitted mass and width values are m=4148.0±2.4(stat.)±6.3(syst.)MeV and Γ=28−11+15(stat.)±19(syst.)MeV , respectively. Evidence for an additional peaking structure at higher J/ψϕ mass is also reported.

Note:

Replaced with published version. Added journal reference and DOI

J/psi(3100): leptonic decay
dimuon: final state
p p: scattering
mass spectrum: (J/psi(3100) Phi(1020))
CERN LHC Coll
resonance: Breit-Wigner
CMS
B: hadronic decay
mass enhancement
resonance: width

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