Study of the pi+pi-J/psi Mass Spectrum via Initial-State Radiation at BABAR

The BaBar Collaboration

Study of the pi+pi-J/psi Mass Spectrum via Initial-State Radiation at BABAR

The BaBar Collaboration

Research output: Chapter in Book/Conference proceeding › Conference contribution

Abstract

We present an update of the study of the Y(4260) resonance, produced in the process e+e−→γISRπ+π−J/ψ using initial-state radiation events at the PEP-II e+e− storage rings. This study is based on 454fb−1 of data recorded with the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at a center-of-mass energy in the Υ(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are mY=4252±6+2−3MeV/c2 and ΓY=105±18+4−6MeV/c2; we also measure ${\calB}(\pi^+\pi^-J/\psi)\Gamma_{e^+e^-} = (7.5\pm 0.9 \pm0.8)$ eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c2 in this decay mode.

Original language	English
Title of host publication	host publication
Publication status	Published - 2008

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@inproceedings{74a1c9a524b8459ca475db6678b7fd2b,

title = "Study of the pi+pi-J/psi Mass Spectrum via Initial-State Radiation at BABAR",

abstract = "We present an update of the study of the Y(4260) resonance, produced in the process e+e−→γISRπ+π−J/ψ using initial-state radiation events at the PEP-II e+e− storage rings. This study is based on 454fb−1 of data recorded with the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at a center-of-mass energy in the Υ(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are mY=4252±6+2−3MeV/c2 and ΓY=105±18+4−6MeV/c2; we also measure ${\calB}(\pi^+\pi^-J/\psi)\Gamma_{e^+e^-} = (7.5\pm 0.9 \pm0.8)$ eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c2 in this decay mode.",

author = "George Lafferty and Kim Alwyn and David Bailey and Roger Barlow and Graham Jackson and George Lafferty and Timothy West and Jong Yi and {The BaBar Collaboration}",

year = "2008",

language = "English",

booktitle = "host publication",

}

TY - GEN

T1 - Study of the pi+pi-J/psi Mass Spectrum via Initial-State Radiation at BABAR

AU - Lafferty, George

AU - Alwyn, Kim

AU - Bailey, David

AU - Barlow, Roger

AU - Jackson, Graham

AU - Lafferty, George

AU - West, Timothy

AU - Yi, Jong

AU - The BaBar Collaboration

PY - 2008

Y1 - 2008

N2 - We present an update of the study of the Y(4260) resonance, produced in the process e+e−→γISRπ+π−J/ψ using initial-state radiation events at the PEP-II e+e− storage rings. This study is based on 454fb−1 of data recorded with the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at a center-of-mass energy in the Υ(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are mY=4252±6+2−3MeV/c2 and ΓY=105±18+4−6MeV/c2; we also measure ${\calB}(\pi^+\pi^-J/\psi)\Gamma_{e^+e^-} = (7.5\pm 0.9 \pm0.8)$ eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c2 in this decay mode.

AB - We present an update of the study of the Y(4260) resonance, produced in the process e+e−→γISRπ+π−J/ψ using initial-state radiation events at the PEP-II e+e− storage rings. This study is based on 454fb−1 of data recorded with the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at a center-of-mass energy in the Υ(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are mY=4252±6+2−3MeV/c2 and ΓY=105±18+4−6MeV/c2; we also measure ${\calB}(\pi^+\pi^-J/\psi)\Gamma_{e^+e^-} = (7.5\pm 0.9 \pm0.8)$ eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c2 in this decay mode.

M3 - Conference contribution

BT - host publication

ER -

Study of the pi+pi-J/psi Mass Spectrum via Initial-State Radiation at BABAR

Abstract

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