Measurement of exclusive π+π− and ρ0 meson photoproduction at HERA
Exclusive photoproduction of ρ0(770) mesons is studied using the H1 detector at the ep collider HERA. A sample of about 900,000 events is used to measure single- and double-differential cross sections for the reaction γp→π+π−Y. Reactions where the proton stays intact (mY=mp) are statistically separa...
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| Main Authors: | , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
23 December 2020
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| In: |
The European physical journal. C, Particles and fields
Year: 2020, Volume: 80, Issue: 12 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-020-08587-3 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-020-08587-3
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| Author Notes: | H1 Collaboration, V. Andreev, A. Bolz, F. Huber, M. Sauter, A. Schöning [und 133 weitere] |
MARC
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| 245 | 1 | 0 | |a Measurement of exclusive π+π− and ρ0 meson photoproduction at HERA |c H1 Collaboration, V. Andreev, A. Bolz, F. Huber, M. Sauter, A. Schöning [und 133 weitere] |
| 246 | 3 | 3 | |a Measurement of exclusive pi plus pi minus and rho zero meson photoproduction at HERA |
| 246 | 3 | 3 | |a Measurement of exclusive π + π − and rho 0 meson photoproduction at HERA |
| 264 | 1 | |c 23 December 2020 | |
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| 520 | |a Exclusive photoproduction of ρ0(770) mesons is studied using the H1 detector at the ep collider HERA. A sample of about 900,000 events is used to measure single- and double-differential cross sections for the reaction γp→π+π−Y. Reactions where the proton stays intact (mY=mp) are statistically separated from those where the proton dissociates to a low-mass hadronic system (mp<mY<10 GeV). The double-differential cross sections are measured as a function of the invariant mass mππ of the decay pions and the squared 4-momentum transfer t at the proton vertex. The measurements are presented in various bins of the photon–proton collision energy Wγp. The phase space restrictions are 0.5≤mππ≤2.2 GeV, |t|≤1.5 GeV2, and 20≤Wγp≤80 GeV. Cross section measurements are presented for both elastic and proton-dissociative scattering. The observed cross section dependencies are described by analytic functions. Parametrising the mππ dependence with resonant and non-resonant contributions added at the amplitude level leads to a measurement of the ρ0(770) meson mass and width at mρ=770.8+2.6−2.7 (tot.) MeV and Γρ=151.3+2.7−3.6 (tot.) MeV, respectively. The model is used to extract the ρ0(770) contribution to the π+π− cross sections and measure it as a function of t and Wγp. In a Regge asymptotic limit in which one Regge trajectory α(t) dominates, the intercept α(t=0)=1.0654 +0.0098−0.0067 (tot.) and the slope α′(t=0)=0.233+0.067−0.074 (tot.) GeV−2 of the t dependence are extracted for the case mY=mp. | ||
| 700 | 1 | |a Andreev, Vladimir |e VerfasserIn |0 (DE-588)1160496137 |0 (DE-627)1023734745 |0 (DE-576)505952939 |4 aut | |
| 700 | 1 | |a Bolz, Arthur |d 1989- |e VerfasserIn |0 (DE-588)1085186970 |0 (DE-627)848868056 |0 (DE-576)456924035 |4 aut | |
| 700 | 1 | |a Huber, Florian |e VerfasserIn |0 (DE-588)1032163593 |0 (DE-627)737999152 |0 (DE-576)37986505X |4 aut | |
| 700 | 1 | |a Sauter, Michel David |d 1980- |e VerfasserIn |0 (DE-588)140565809 |0 (DE-627)703716786 |0 (DE-576)318772981 |4 aut | |
| 700 | 1 | |a Schöning, André |e VerfasserIn |0 (DE-588)1028091052 |0 (DE-627)730337553 |0 (DE-576)375620893 |4 aut | |
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