Measurement of exclusive π+π− and ρ0 meson photoproduction at HERA

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dc.citation.articleNumber1189en_US
dc.citation.journalTitleThe European Physical Journal Cen_US
dc.citation.volumeNumber80en_US
dc.contributor.authorH1 Collaborationen_US
dc.date.accessioned2021-02-08T18:37:45Zen_US
dc.date.available2021-02-08T18:37:45Zen_US
dc.date.issued2020en_US
dc.description.abstractExclusive 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.en_US
dc.identifier.citationH1 Collaboration. "Measurement of exclusive π+π− and ρ0 meson photoproduction at HERA." <i>The European Physical Journal C,</i> 80, (2020) Springer: https://doi.org/10.1140/epjc/s10052-020-08587-3.en_US
dc.identifier.digitalMeasurementOfExclusiveVarvecPien_US
dc.identifier.doihttps://doi.org/10.1140/epjc/s10052-020-08587-3en_US
dc.identifier.urihttps://hdl.handle.net/1911/109805en_US
dc.language.isoengen_US
dc.publisherSpringeren_US
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleMeasurement of exclusive π+π− and ρ0 meson photoproduction at HERAen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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