Photoproduction of {pi}{sup +}{pi}{sup -} meson pairs on the proton

Journal Article · Thu Oct 01 04:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.80.072005· OSTI ID:21325198

Battaglieri, M; De Vita, R; Anghinolfi, M; Drozdov, V; Ricco, G; Ripani, M; Taiuti, M ^[1]; Szczepaniak, A P ^[2]; Adhikari, K P; Amaryan, M J; Careccia, S L; Dodge, G E; Hyde, C E; Klein, A; Kubarovsky, A; Mayer, M; Nepali, C S; Niroula, M R; Seraydaryan, H; Tkachenko, S ^[3]

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1. Istituto Nazionale di Fisica Nucleare, Sezione di Genova, 16146 Genova (Italy)
2. Physics Department and Nuclear Theory Center Indiana University, Bloomington, Indiana 47405 (United States)
3. Old Dominion University, Norfolk, Virginia 23529 (United States)

The exclusive reaction {gamma}p{yields}p{pi}{sup +}{pi}{sup -} was studied in the photon energy range 3.0-3.8 GeV and the momentum transfer range 0.4<-t<1.0 GeV{sup 2}. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range, the integrated luminosity was about 20 pb{sup -1}. The reaction was isolated by detecting the {pi}{sup +} and proton in CLAS, and reconstructing the {pi}{sup -} via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the S, P, and D-waves, in the M{sub {pi}{sup +}}{sub {pi}{sup -}} mass range 0.4-1.4 GeV, were derived performing a partial wave expansion of the extracted moments. Beside the dominant contribution of the {rho}(770) meson in the P-wave, evidence for the f{sub 0}(980) and the f{sub 2}(1270) mesons was found in the S and D-waves, respectively. The differential production cross sections d{sigma}/dt for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the f{sub 0}(980) has been measured in a photoproduction experiment.

• OSTI ID: 21325198
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
CEBAF ACCELERATOR
D WAVES
DIFFERENTIAL CROSS SECTIONS
F0-980 MESONS
F2-1270 MESONS
GAMMA RADIATION
GEV RANGE 01-10
LUMINOSITY
MISSING MASS
MOMENTUM TRANSFER
PARTICLE DECAY
PHOTON-PROTON INTERACTIONS
PHOTONS
PHOTOPRODUCTION
PIONS MINUS
PIONS PLUS
PROTONS
RHO-770 MESONS
S WAVES