Observation of a Broad Structure in the pi+pi- J/psi Mass Spectrum at 4.26 GeV/c2

B Aubert; Matthew Barrett; Kelly Ford; Theresa Harrison; Alistair Hart; Christopher Hawkes; Sian Morgan; Alan Watson

doi:10.1103/PhysRevLett.95.142001

Observation of a Broad Structure in the pi+pi- J/psi Mass Spectrum at 4.26 GeV/c2

B Aubert, Matthew Barrett, Kelly Ford, Theresa Harrison, Alistair Hart, Christopher Hawkes, Sian Morgan, Alan Watson

Physics and Astronomy

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Abstract

We study initial-state radiation events, e+ e- --> gammaISR pi+ pi- J/psi, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of pi+ pi- J/psi. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.

Original language	English
Pages (from-to)	142001
Number of pages	1
Journal	Physical Review Letters
Volume	95
DOIs	https://doi.org/10.1103/PhysRevLett.95.142001
Publication status	Published - 1 Sept 2005

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10.1103/PhysRevLett.95.142001

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title = "Observation of a Broad Structure in the pi+pi- J/psi Mass Spectrum at 4.26 GeV/c2",

abstract = "We study initial-state radiation events, e+ e- --> gammaISR pi+ pi- J/psi, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of pi+ pi- J/psi. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.",

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T1 - Observation of a Broad Structure in the pi+pi- J/psi Mass Spectrum at 4.26 GeV/c2

AU - Aubert, B

AU - Barrett, Matthew

AU - Ford, Kelly

AU - Harrison, Theresa

AU - Hart, Alistair

AU - Hawkes, Christopher

AU - Morgan, Sian

AU - Watson, Alan

PY - 2005/9/1

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N2 - We study initial-state radiation events, e+ e- --> gammaISR pi+ pi- J/psi, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of pi+ pi- J/psi. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.

AB - We study initial-state radiation events, e+ e- --> gammaISR pi+ pi- J/psi, with data collected with the BABAR detector. We observe an accumulation of events near 4.26 GeV/c2 in the invariant-mass spectrum of pi+ pi- J/psi. Fits to the mass spectrum indicate that a broad resonance with a mass of about 4.26 GeV/c2 is required to describe the observed structure. The presence of additional narrow resonances cannot be excluded. The fitted width of the broad resonance is 50 to 90 MeV/c2, depending on the fit hypothesis.

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U2 - 10.1103/PhysRevLett.95.142001

DO - 10.1103/PhysRevLett.95.142001

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SN - 1079-7114

VL - 95

SP - 142001

JO - Physical Review Letters

JF - Physical Review Letters

ER -

Observation of a Broad Structure in the pi+pi- J/psi Mass Spectrum at 4.26 GeV/c2

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