Search for low-mass states in elastic e+e-scattering

Xiao Yan Wu; P.  Asoka-Kumar; J. S. Greenberg; S. D. Henderson; Heikki Huomo; K. G. Lynn; M. S. Lubell; R. Mayer; J.  McDonough; B.F. Phlips; A. Vehanen

doi:10.1103/PhysRevLett.69.1729

Search for low-mass states in elastic e+e-scattering

Xiao Yan Wu
, P. Asoka-Kumar
, J. S. Greenberg
, S. D. Henderson
, Heikki Huomo
, K. G. Lynn
, M. S. Lubell
, R. Mayer
, J. McDonough
, B.F. Phlips
, A. Vehanen

VTT Technical Research Centre of Finland

Brookhaven National Laboratory
Yale University
City University of New York

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

Abstract

We report results of an experiment to search for a resonance enhancement of the
e⁺e⁻ scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/c²<M⁰_X<1860 keV/c² that can be associated with the e⁺e⁻ sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the e⁺e⁻ channel dominates, we deduce lower limits on lifetimes τ>3.3×10⁻¹³ sec (J=0) and τ>8.2×10⁻¹³ sec (J=1), at 90% C.L.

Original language	English
Pages (from-to)	1729-1732
Journal	Physical Review Letters
Volume	69
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.69.1729
Publication status	Published - 1992
MoE publication type	A1 Journal article-refereed

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10.1103/PhysRevLett.69.1729

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title = "Search for low-mass states in elastic e+e-scattering",

abstract = "We report results of an experiment to search for a resonance enhancement of the e+e− scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27\%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/c20X<1860 keV/c2 that can be associated with the e+e− sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the e+e− channel dominates, we deduce lower limits on lifetimes τ>3.3×10−13 sec (J=0) and τ>8.2×10−13 sec (J=1), at 90\% C.L. ",

author = "Wu, \{Xiao Yan\} and P. Asoka-Kumar and Greenberg, \{J. S.\} and Henderson, \{S. D.\} and Heikki Huomo and Lynn, \{K. G.\} and Lubell, \{M. S.\} and R. Mayer and J. McDonough and B.F. Phlips and A. Vehanen",

note = "Project code: INST931",

year = "1992",

doi = "10.1103/PhysRevLett.69.1729",

language = "English",

volume = "69",

pages = "1729--1732",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society (APS)",

number = "12",

}

TY - JOUR

T1 - Search for low-mass states in elastic e+e-scattering

AU - Wu, Xiao Yan

AU - Asoka-Kumar, P.

AU - Greenberg, J. S.

AU - Henderson, S. D.

AU - Huomo, Heikki

AU - Lynn, K. G.

AU - Lubell, M. S.

AU - Mayer, R.

AU - McDonough, J.

AU - Phlips, B.F.

AU - Vehanen, A.

N1 - Project code: INST931

PY - 1992

Y1 - 1992

N2 - We report results of an experiment to search for a resonance enhancement of the e+e− scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/c20X<1860 keV/c2 that can be associated with the e+e− sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the e+e− channel dominates, we deduce lower limits on lifetimes τ>3.3×10−13 sec (J=0) and τ>8.2×10−13 sec (J=1), at 90% C.L.

AB - We report results of an experiment to search for a resonance enhancement of the e+e− scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/c20X<1860 keV/c2 that can be associated with the e+e− sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the e+e− channel dominates, we deduce lower limits on lifetimes τ>3.3×10−13 sec (J=0) and τ>8.2×10−13 sec (J=1), at 90% C.L.

U2 - 10.1103/PhysRevLett.69.1729

DO - 10.1103/PhysRevLett.69.1729

M3 - Article

SN - 0031-9007

VL - 69

SP - 1729

EP - 1732

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

ER -

Search for low-mass states in elastic e+e-scattering

Abstract

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