Study of charmonium production in b-hadron decays and first evidence for the decay B-s(0) -> phi phi phi
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Using decays to ϕϕ -meson pairs, the inclusive production of charmonium states in bb -hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0fb−13.0fb−1 , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by BC≡B(b→CX)×B(C→ϕϕ)BC≡B(b→CX)×B(C→ϕϕ) the inclusive branching fraction of a bb hadron to a charmonium state C that decays into a pair of ϕϕ mesons, ratios RC1C2≡BC1/BC2RC2C1≡BC1/BC2 are determined as Rχc0ηc(1S)=0.147±0.023±0.011Rηc(1S)χc0=0.147±0.023±0.011 , Rχc1ηc(1S)=0.073±0.016±0.006Rηc(1S)χc1=0.073±0.016±0.006 , Rχc2ηc(1S)=0.081±0.013±0.005Rηc(1S)χc2=0.081±0.013±0.005 , Rχc1χc0=0.50±0.11±0.01Rχc0χc1=0.50±0.11±0.01 , Rχc2χc0=0.56±0.10±0.01Rχc0χc2=0.56±0.10±0.01 and Rηc(2S)ηc(1S)=0.040±0.011±0.004Rηc(1S)ηc(2S)=0.040±0.011±0.004 . Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and χc2(2P)χc2(2P) states are obtained as RX(3872)χc1<0.34Rχc1X(3872)<0.34 , RX(3915)χc0<0.12Rχc0X(3915)<0.12 and Rχc2(2P)χc2<0.16Rχc2χc2(2P)<0.16 . Differential cross-sections as a function of transverse momentum are measured for the ηc(1S)ηc(1S) and χcχc states. The branching fraction of the decay B0s→ϕϕϕBs0→ϕϕϕ is measured for the first time, B(B0s→ϕϕϕ)=(2.15±0.54±0.28±0.21B)×10−6B(Bs0→ϕϕϕ)=(2.15±0.54±0.28±0.21B)×10−6 . Here the third uncertainty is due to the branching fraction of the decay B0s→ϕϕBs0→ϕϕ , which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse ϕϕ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the ηc(1S)ηc(1S) decays to ϕϕϕϕ and pp¯¯¯pp¯ as B(ηc(1S)→ϕϕ)/B(ηc(1S)→pp¯¯¯)=1.79±0.14±0.32B(ηc(1S)→ϕϕ)/B(ηc(1S)→pp¯)=1.79±0.14±0.32 .
Date Issued
2017-09-14
Date Acceptance
2017-08-20
Citation
European Physical Journal C: Particles and Fields, 2017, 77 (9)
ISSN
1434-6044
Publisher
Springer Verlag (Germany)
Journal / Book Title
European Physical Journal C: Particles and Fields
Volume
77
Issue
9
Copyright Statement
© The Author(s) 2017
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Funded by SCOAP3
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Funded by SCOAP3
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Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
BRANCHING FRACTIONS
PP COLLISIONS
J/PSI
POLARIZATION
ETA(C)(2S)
DETECTOR
PSI(2S)
TOOL
TEV
Publication Status
Published
Article Number
609