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g11

Spokesperson
M. Battaglieri
Year
2009
Abstract
The exclusive reaction γp -> pπ+π− was studied in the photon energy range 3.0-3.8 GeV and momentum transfer range 0.4 < −t < 1.0 GeV2. 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−1. The reaction was isolated by detecting the π+ and proton in CLAS, and reconstructing the π− 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 Mπ+π− mass range 0.4 − 1.4 GeV were derived performing a partial wave expansion of the extracted moments. Besides the dominant contribution of the ρ(770) meson in the P-wave, evidence for the f0(980) and the f2(1270) mesons was found in the S and D-waves, respectively. The differential production cross sections dσ/dt for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the f0(980) has been measured in a photoproduction experiment.
Comment
-t variable bin width is +/- 0.5 GeV2 for all measurements.
Publications
  1. M. Battaglieri, R. De Vita, A. P. Szczepaniak, and CLAS Collaboration Photoproduction of π+π- meson pairs on the proton. // PRD 80, 072005 (2009)
  2. M. Battaglieri, R. De Vita, A. P. Szczepaniak, and CLAS Collaboration First measurement of direct f0(980) photoproduction on the proton // PRL 102, 102001 (2009)
Quantities
dσ/dt   d2σs/dt dMππ   ρ01,-1   d2σp/dt dMππ   ρs00,0   d2σp-/dt dMππ   ρs01,0   d2σp0/dt dMππ   d2σp+/dt dMππ   d2σd/dt dMππ   d2σd-/dt dMππ   d2σd0/dt dMππ   d2σd+/dt dMππ   d2σf/dt dMππ   d2σf-/dt dMππ   d2σf0/dt dMππ   d2σf+/dt dMππ   ρ00,0   ρ01,0   Y00   Y10   Y11   Y20   Y21   Y22   Y30   Y31   Y32   Y33   Y40   Y41   Y42   Y43   Y44

Measurements

ID Quantity Beam Target Final state Q2min,
GeV2 		Q2max,
GeV2 		Wmin,
GeV 		Wmax,
GeV
E28M101 Y41 γ p π+π−p 0.0 0.0 2.55 2.62
E28M102 Y41 γ p π+π−p 0.0 0.0 2.62 2.69
E28M103 Y41 γ p π+π−p 0.0 0.0 2.69 2.76
E28M104 Y41 γ p π+π−p 0.0 0.0 2.76 2.83
E28M105 Y42 γ p π+π−p 0.0 0.0 2.55 2.62
E28M106 Y42 γ p π+π−p 0.0 0.0 2.62 2.69
E28M107 Y42 γ p π+π−p 0.0 0.0 2.69 2.76
E28M108 Y42 γ p π+π−p 0.0 0.0 2.76 2.83
E28M109 d2σs/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M110 d2σs/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M111 d2σs/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M112 d2σs/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M113 d2σp/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M114 d2σp/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M115 d2σp/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M116 d2σp/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M117 d2σp-/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M118 d2σp-/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M119 d2σp-/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M120 d2σp-/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M121 d2σp0/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M122 d2σp0/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M123 d2σp0/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M124 d2σp0/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M125 d2σp+/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M126 d2σp+/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M127 d2σp+/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M128 d2σp+/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M129 d2σd/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M130 d2σd/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M131 d2σd/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M132 d2σd/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M133 d2σd-/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M134 d2σd-/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M135 d2σd-/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M136 d2σd-/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M137 d2σd0/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M138 d2σd0/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M139 d2σd0/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M140 d2σd0/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M141 d2σd+/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M142 d2σd+/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M143 d2σd+/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M144 d2σd+/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M145 d2σf/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M146 d2σf/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M147 d2σf/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M148 d2σf/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M149 d2σf-/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M150 d2σf-/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M151 d2σf-/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M152 d2σf-/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M153 d2σf0/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M154 d2σf0/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M155 d2σf0/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M156 d2σf0/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M157 d2σf+/dt dMππ γ p π+π−p 0.0 0.0 2.55 2.62
E28M158 d2σf+/dt dMππ γ p π+π−p 0.0 0.0 2.62 2.69
E28M159 d2σf+/dt dMππ γ p π+π−p 0.0 0.0 2.69 2.76
E28M160 d2σf+/dt dMππ γ p π+π−p 0.0 0.0 2.76 2.83
E28M161 ρ00,0 γ p π+π−p 0.0 0.0 2.55 2.62
E28M162 ρ00,0 γ p π+π−p 0.0 0.0 2.62 2.69
E28M163 ρ00,0 γ p π+π−p 0.0 0.0 2.69 2.76
E28M164 ρ00,0 γ p π+π−p 0.0 0.0 2.76 2.83
E28M165 ρ01,0 γ p π+π−p 0.0 0.0 2.55 2.62
E28M166 ρ01,0 γ p π+π−p 0.0 0.0 2.62 2.69
E28M167 ρ01,0 γ p π+π−p 0.0 0.0 2.69 2.76
E28M168 ρ01,0 γ p π+π−p 0.0 0.0 2.76 2.83
E28M169 ρ01,-1 γ p π+π−p 0.0 0.0 2.55 2.62
E28M170 ρ01,-1 γ p π+π−p 0.0 0.0 2.62 2.69
E28M171 ρ01,-1 γ p π+π−p 0.0 0.0 2.69 2.76
E28M172 ρ01,-1 γ p π+π−p 0.0 0.0 2.76 2.83
E28M173 ρs00,0 γ p π+π−p 0.0 0.0 2.55 2.62
E28M174 ρs00,0 γ p π+π−p 0.0 0.0 2.62 2.69
E28M175 ρs00,0 γ p π+π−p 0.0 0.0 2.69 2.76
E28M176 ρs00,0 γ p π+π−p 0.0 0.0 2.76 2.83
E28M177 ρs01,0 γ p π+π−p 0.0 0.0 2.55 2.62
E28M178 ρs01,0 γ p π+π−p 0.0 0.0 2.62 2.69
E28M179 ρs01,0 γ p π+π−p 0.0 0.0 2.69 2.76
E28M180 ρs01,0 γ p π+π−p 0.0 0.0 2.76 2.83
E28M181 dσ/dt γ p π+π−p 0.0 0.0 2.55 2.83
E28M182 dσ/dt γ p π+π−p 0.0 0.0 2.55 2.83
E28M183 dσ/dt γ p π+π−p 0.0 0.0 2.55 2.83
Created in SINP MSU, CLAS Collaboration