Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

ATLAS Collaboration; Wahid Bhimji; Philip Clark; Robert Harrington; Victoria Martin

doi:10.1103/PhysRevLett.108.152001

Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

ATLAS Collaboration, Wahid Bhimji, Philip Clark, Robert Harrington, Victoria Martin

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.

Original language	English
Pages (from-to)	152001
Number of pages	152001
Journal	Physical Review Letters
Volume	108
DOIs	https://doi.org/10.1103/PhysRevLett.108.152001
Publication status	Published - 2012

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10.1103/PhysRevLett.108.152001

http://arxiv.org/abs/1112.5154

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title = "Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS",

abstract = "The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.",

author = "{ATLAS Collaboration} and Wahid Bhimji and Philip Clark and Robert Harrington and Victoria Martin",

note = "CERN-PH-EP-2011-225",

year = "2012",

doi = "10.1103/PhysRevLett.108.152001",

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journal = "Physical Review Letters",

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TY - JOUR

T1 - Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

AU - ATLAS Collaboration

AU - Bhimji, Wahid

AU - Clark, Philip

AU - Harrington, Robert

AU - Martin, Victoria

N1 - CERN-PH-EP-2011-225

PY - 2012

Y1 - 2012

N2 - The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.

AB - The chi_b(nP) quarkonium states are produced in proton-proton collisions at the Large Hadron Collider (LHC) at sqrt(s) = 7 TeV and recorded by the ATLAS detector. Using a data sample corresponding to an integrated luminosity of 4.4 fb^-1, these states are reconstructed through their radiative decays to Upsilon(1S,2S) with Upsilon->mu+mu-. In addition to the mass peaks corresponding to the decay modes chi_b(1P,2P)->Upsilon(1S)gamma, a new structure centered at a mass of 10.530+/-0.005 (stat.)+/-0.009 (syst.) GeV is also observed, in both the Upsilon(1S)gamma and Upsilon(2S)gamma decay modes. This is interpreted as the chi_b(3P) system.

U2 - 10.1103/PhysRevLett.108.152001

DO - 10.1103/PhysRevLett.108.152001

M3 - Article

VL - 108

SP - 152001

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

ER -

Observation of a new chi_b state in radiative transitions to Upsilon(1S) and Upsilon(2S) at ATLAS

Abstract

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