χc1 and χc2 Resonance Parameters with the Decays χc1;c2 → J=ψμ+μ−

LHCb Collaboration

doi:10.1103/PhysRevLett.119.221801

χc1 and χc2 Resonance Parameters with the Decays χc1;c2 → J=ψμ+μ−

LHCb Collaboration

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Abstract

The decays χc1 → J=ψμþμ− and χc2 → J=ψμþμ− are observed and used to study the resonance parameters of the χc1 and χc2 mesons. The masses of these states are measured to be mðχc1Þ¼ 3510.710.04ðstatÞ0.09ðsystÞ MeV and mðχc2Þ¼3556.100.06ðstatÞ0.11ðsystÞ MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference mðχc2Þ−mðχc1Þ¼ 45.390.07ðstatÞ0.03ðsystÞ MeV. The natural width of the χc2 meson is measured to be Γðχc2Þ¼2.100.20ðstatÞ0.02ðsystÞ MeV. These results are in good agreement with and have comparable precision to the current world averages.

Original language	English
Article number	221801
Journal	Physical Review Letters
Volume	119
DOIs	https://doi.org/10.1103/PhysRevLett.119.221801
Publication status	Published - 28 Nov 2017

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Bristol Consolidated Grant 2015-9
Goldstein, J. (Principal Investigator)
1/10/15 → 31/03/21
Project: Research

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@article{b27d4d9a672e4b3f8f6c65f36b9b62ac,

title = "χc1 and χc2 Resonance Parameters with the Decays χc1;c2 → J=ψμ+μ−",

abstract = "The decays χc1 → J=ψμ{\th}μ− and χc2 → J=ψμ{\th}μ− are observed and used to study the resonance parameters of the χc1 and χc2 mesons. The masses of these states are measured to be m{\dh}χc1{\TH}¼ 3510.710.04{\dh}stat{\TH}0.09{\dh}syst{\TH} MeV and m{\dh}χc2{\TH}¼3556.100.06{\dh}stat{\TH}0.11{\dh}syst{\TH} MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference m{\dh}χc2{\TH}−m{\dh}χc1{\TH}¼ 45.390.07{\dh}stat{\TH}0.03{\dh}syst{\TH} MeV. The natural width of the χc2 meson is measured to be Γ{\dh}χc2{\TH}¼2.100.20{\dh}stat{\TH}0.02{\dh}syst{\TH} MeV. These results are in good agreement with and have comparable precision to the current world averages.",

author = "Marco Adinolfi and Emma Buchanan and Matthew Chapman and Andrew Cook and Jeremy Dalseno and Sam Harnew and James Kariuki and Samuel Maddrell-Mander and Paras Naik and Gabriela Pomery and Eugenia Price and Claire Prouve and Renato Quagliani and Jonas Rademacker and Sophie Richards and Daniel Saunders and Nicola Skidmore and {LHCb Collaboration}",

year = "2017",

month = nov,

day = "28",

doi = "10.1103/PhysRevLett.119.221801",

language = "English",

volume = "119",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

}

TY - JOUR

T1 - χc1 and χc2 Resonance Parameters with the Decays χc1;c2 → J=ψμ+μ−

AU - Adinolfi, Marco

AU - Buchanan, Emma

AU - Chapman, Matthew

AU - Cook, Andrew

AU - Dalseno, Jeremy

AU - Harnew, Sam

AU - Kariuki, James

AU - Maddrell-Mander, Samuel

AU - Naik, Paras

AU - Pomery, Gabriela

AU - Price, Eugenia

AU - Prouve, Claire

AU - Quagliani, Renato

AU - Rademacker, Jonas

AU - Richards, Sophie

AU - Saunders, Daniel

AU - Skidmore, Nicola

AU - LHCb Collaboration

PY - 2017/11/28

Y1 - 2017/11/28

N2 - The decays χc1 → J=ψμþμ− and χc2 → J=ψμþμ− are observed and used to study the resonance parameters of the χc1 and χc2 mesons. The masses of these states are measured to be mðχc1Þ¼ 3510.710.04ðstatÞ0.09ðsystÞ MeV and mðχc2Þ¼3556.100.06ðstatÞ0.11ðsystÞ MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference mðχc2Þ−mðχc1Þ¼ 45.390.07ðstatÞ0.03ðsystÞ MeV. The natural width of the χc2 meson is measured to be Γðχc2Þ¼2.100.20ðstatÞ0.02ðsystÞ MeV. These results are in good agreement with and have comparable precision to the current world averages.

AB - The decays χc1 → J=ψμþμ− and χc2 → J=ψμþμ− are observed and used to study the resonance parameters of the χc1 and χc2 mesons. The masses of these states are measured to be mðχc1Þ¼ 3510.710.04ðstatÞ0.09ðsystÞ MeV and mðχc2Þ¼3556.100.06ðstatÞ0.11ðsystÞ MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference mðχc2Þ−mðχc1Þ¼ 45.390.07ðstatÞ0.03ðsystÞ MeV. The natural width of the χc2 meson is measured to be Γðχc2Þ¼2.100.20ðstatÞ0.02ðsystÞ MeV. These results are in good agreement with and have comparable precision to the current world averages.

U2 - 10.1103/PhysRevLett.119.221801

DO - 10.1103/PhysRevLett.119.221801

M3 - Article (Academic Journal)

C2 - 29286773

SN - 0031-9007

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 221801

ER -

χc1 and χc2 Resonance Parameters with the Decays χc1;c2 → J=ψμ+μ−

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Bristol Consolidated Grant 2015-9

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