Measurement of initial-state-final-state radiation interference in the processes e+e- →μ+μ-γ and e+e- →π+π-γ

The BABAR Collaboration

doi:10.1103/PhysRevD.92.072015

Measurement of initial-state-final-state radiation interference in the processes e+e- →μ+μ-γ and e+e- →π+π-γ

The BABAR Collaboration

Université Savoie Mont Blanc
University of Barcelona
INFN Sezione di Bari
Università degli studi di Bari Aldo Moro
University of Bergen
Ernest Orlando Lawrence Berkeley National Laboratory
Ruhr-University Bochum
University of British Columbia
Brunel University London
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Novosibirsk State Technical University
Long Beach VA and University of California
University of California, Riverside
University of California, Santa Barbara
University of California at Santa Cruz
California Institute of Technology
University of Cincinnati
University of Colorado Boulder
Cooperative Institute for Research in the Atmosphere
University of Tabuk
University of Dortmund
University of Edinburgh
Sezione INFN di Ferrara
University of Ferrara
LNF-INFN
Sezione di Genova
University of Genoa
Department of Biosciences and Bioengineering
University of Heidelberg
Humboldt-Universität zu Berlin
University of Iowa
Iowa State University
Jazan University
Johns Hopkins University
Laboratoire de l'Accélérateur Linéaire
Université Paris-Sud
Institute of High Energy Physics, Chinese Academy of Sciences
Lawrence Livermore National Laboratory
University of Liverpool
Queen Mary University of London
Royal Holloway University of London
University of Louisville
Johannes Gutenberg University
University of Manchester
University of Huddersfield
University of Maryland, College Park
Massachusetts Institute of Technology
McGill University
Sezione INFN di Milano
University of Milano
University of Mississippi
Universety of South Alabama
Universite de Montreal
INFN Sezione di Napoli
University of Naples Federico II
Science Park 105
University of Notre Dame
The Ohio State University
INFN
University of Padova
Universités Paris VI and VII
INFN Sezione di Perugia
University of Perugia
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
University of Pisa
Dipartimento di Scienze Biomediche
Scuola Normale Superiore di Pisa
Princeton University
Sezione di Roma
Dipartimento di Fisica
Universität Rostock
CCLRC Rutherford Appleton Laboratory
CEA/UVSQ/CNRS
Stanford Linear Accelerator Center
University of South Carolina
Southern Methodist University
Stanford University
State University of New York Albany
Tel Aviv University
University of Tennessee
The University of Texas at Austin
University of Texas
INFN Sezione di Torino
University of Turin
INFN Sezione di Trieste
University of Trieste
University of Valencia
University of Victoria
University of Warwick
University of Wisconsin-Madison

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Résumé

Charge asymmetry in the processes e+e-→μ+μ-γ and e+e-→π+π-γ is measured using 232 fb-1 of data collected with the BABAR detector at e+e- center-of-mass energies near 10.58 GeV. An observable is introduced and shown to be very robust against detector asymmetries while keeping a large sensitivity to the physical charge asymmetry that results from the interference between initial- and final-state radiation (FSR). The asymmetry is determined as a function of the invariant mass of the final-state tracks from production threshold to a few GeV/c2. It is compared to the expectation from QED for e+e-→μ+μ-γ, and from theoretical models for e+e-→π+π-γ. A clear interference pattern is observed in e+e-→π+π-γ, particularly in the vicinity of the f2(1270) resonance. The inferred rate of lowest-order FSR production is consistent with the QED expectation for e+e-→μ+μ-γ, and is negligibly small for e+e-→π+π-γ.

langue originale	Anglais
Numéro d'article	072015
journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	92
Numéro de publication	7
Les DOIs	https://doi.org/10.1103/PhysRevD.92.072015
état	Publié - 28 oct. 2015

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10.1103/PhysRevD.92.072015

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@article{12d2d9d6760542129c3c1a1af8567439,

title = "Measurement of initial-state-final-state radiation interference in the processes e+e- →μ+μ-γ and e+e- →π+π-γ",

abstract = "Charge asymmetry in the processes e+e-→μ+μ-γ and e+e-→π+π-γ is measured using 232 fb-1 of data collected with the BABAR detector at e+e- center-of-mass energies near 10.58 GeV. An observable is introduced and shown to be very robust against detector asymmetries while keeping a large sensitivity to the physical charge asymmetry that results from the interference between initial- and final-state radiation (FSR). The asymmetry is determined as a function of the invariant mass of the final-state tracks from production threshold to a few GeV/c2. It is compared to the expectation from QED for e+e-→μ+μ-γ, and from theoretical models for e+e-→π+π-γ. A clear interference pattern is observed in e+e-→π+π-γ, particularly in the vicinity of the f2(1270) resonance. The inferred rate of lowest-order FSR production is consistent with the QED expectation for e+e-→μ+μ-γ, and is negligibly small for e+e-→π+π-γ.",

author = "\{The BABAR Collaboration\} and Lees, \{J. P.\} and V. Poireau and V. Tisserand and E. Grauges and A. Palano and G. Eigen and B. Stugu and Brown, \{D. N.\} and Kerth, \{L. T.\} and Kolomensky, \{Yu G.\} and Lee, \{M. J.\} and G. Lynch and H. Koch and T. Schroeder and C. Hearty and Mattison, \{T. S.\} and McKenna, \{J. A.\} and So, \{R. Y.\} and A. Khan and Blinov, \{V. E.\} and Buzykaev, \{A. R.\} and Druzhinin, \{V. P.\} and Golubev, \{V. B.\} and Kravchenko, \{E. A.\} and Onuchin, \{A. P.\} and Serednyakov, \{S. I.\} and Skovpen, \{Yu I.\} and Solodov, \{E. P.\} and Todyshev, \{K. Yu\} and Lankford, \{A. J.\} and B. Dey and Gary, \{J. W.\} and O. Long and \{Franco Sevilla\}, M. and Hong, \{T. M.\} and D. Kovalskyi and Richman, \{J. D.\} and West, \{C. A.\} and Eisner, \{A. M.\} and Lockman, \{W. S.\} and \{Panduro Vazquez\}, W. and Schumm, \{B. A.\} and A. Seiden and Chao, \{D. S.\} and Cheng, \{C. H.\} and B. Echenard and Flood, \{K. T.\} and Hitlin, \{D. G.\} and D. Bernard and M. Verderi",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = oct,

day = "28",

doi = "10.1103/PhysRevD.92.072015",

language = "English",

volume = "92",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "7",

}

TY - JOUR

T1 - Measurement of initial-state-final-state radiation interference in the processes e+e- →μ+μ-γ and e+e- →π+π-γ

AU - The BABAR Collaboration

AU - Lees, J. P.

AU - Poireau, V.

AU - Tisserand, V.

AU - Grauges, E.

AU - Palano, A.

AU - Eigen, G.

AU - Stugu, B.

AU - Brown, D. N.

AU - Kerth, L. T.

AU - Kolomensky, Yu G.

AU - Lee, M. J.

AU - Lynch, G.

AU - Koch, H.

AU - Schroeder, T.

AU - Hearty, C.

AU - Mattison, T. S.

AU - McKenna, J. A.

AU - So, R. Y.

AU - Khan, A.

AU - Blinov, V. E.

AU - Buzykaev, A. R.

AU - Druzhinin, V. P.

AU - Golubev, V. B.

AU - Kravchenko, E. A.

AU - Onuchin, A. P.

AU - Serednyakov, S. I.

AU - Skovpen, Yu I.

AU - Solodov, E. P.

AU - Todyshev, K. Yu

AU - Lankford, A. J.

AU - Dey, B.

AU - Gary, J. W.

AU - Long, O.

AU - Franco Sevilla, M.

AU - Hong, T. M.

AU - Kovalskyi, D.

AU - Richman, J. D.

AU - West, C. A.

AU - Eisner, A. M.

AU - Lockman, W. S.

AU - Panduro Vazquez, W.

AU - Schumm, B. A.

AU - Seiden, A.

AU - Chao, D. S.

AU - Cheng, C. H.

AU - Echenard, B.

AU - Flood, K. T.

AU - Hitlin, D. G.

AU - Bernard, D.

AU - Verderi, M.

PY - 2015/10/28

Y1 - 2015/10/28

N2 - Charge asymmetry in the processes e+e-→μ+μ-γ and e+e-→π+π-γ is measured using 232 fb-1 of data collected with the BABAR detector at e+e- center-of-mass energies near 10.58 GeV. An observable is introduced and shown to be very robust against detector asymmetries while keeping a large sensitivity to the physical charge asymmetry that results from the interference between initial- and final-state radiation (FSR). The asymmetry is determined as a function of the invariant mass of the final-state tracks from production threshold to a few GeV/c2. It is compared to the expectation from QED for e+e-→μ+μ-γ, and from theoretical models for e+e-→π+π-γ. A clear interference pattern is observed in e+e-→π+π-γ, particularly in the vicinity of the f2(1270) resonance. The inferred rate of lowest-order FSR production is consistent with the QED expectation for e+e-→μ+μ-γ, and is negligibly small for e+e-→π+π-γ.

AB - Charge asymmetry in the processes e+e-→μ+μ-γ and e+e-→π+π-γ is measured using 232 fb-1 of data collected with the BABAR detector at e+e- center-of-mass energies near 10.58 GeV. An observable is introduced and shown to be very robust against detector asymmetries while keeping a large sensitivity to the physical charge asymmetry that results from the interference between initial- and final-state radiation (FSR). The asymmetry is determined as a function of the invariant mass of the final-state tracks from production threshold to a few GeV/c2. It is compared to the expectation from QED for e+e-→μ+μ-γ, and from theoretical models for e+e-→π+π-γ. A clear interference pattern is observed in e+e-→π+π-γ, particularly in the vicinity of the f2(1270) resonance. The inferred rate of lowest-order FSR production is consistent with the QED expectation for e+e-→μ+μ-γ, and is negligibly small for e+e-→π+π-γ.

UR - https://www.scopus.com/pages/publications/84946944005

U2 - 10.1103/PhysRevD.92.072015

DO - 10.1103/PhysRevD.92.072015

M3 - Article

AN - SCOPUS:84946944005

SN - 1550-7998

VL - 92

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 7

M1 - 072015

ER -

Measurement of initial-state-final-state radiation interference in the processes e+e- →μ+μ-γ and e+e- →π+π-γ

Résumé

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