Measurement of exclusive <mml:msup>pi+</mml:msup><mml:msup>pi-</mml:msup> and <mml:msup>rho 0</mml:msup> meson photoproduction at HERA: H1 Collaboration
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F20%3A10421986" target="_blank" >RIV/00216208:11320/20:10421986 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-uZzVh2rHe" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=-uZzVh2rHe</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-020-08587-3" target="_blank" >10.1140/epjc/s10052-020-08587-3</a>
Alternative languages
Result language
angličtina
Original language name
Measurement of exclusive <mml:msup>pi+</mml:msup><mml:msup>pi-</mml:msup> and <mml:msup>rho 0</mml:msup> meson photoproduction at HERA: H1 Collaboration
Original language description
Exclusive photoproduction of rho 0(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 gamma p -> pi+pi -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<mml:mspace width="3.33333pt"></mml:mspace>GeV). The double-differential cross sections are measured as a function of the invariant mass m pi pi 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 W gamma p. The phase space restrictions are 0.5 <= m pi pi <= 2.2<mml:mspace width="3.33333pt"></mml:mspace>GeV, |t|<= 1.5<mml:mspace width="3.33333pt"></mml:mspace>GeV2, and 20 <= W gamma p <= 80<mml:mspace width="3.33333pt"></mml:mspace>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 m pi pi dependence with resonant and non-resonant contributions added at the amplitude level leads to a measurement of the rho 0(770) meson mass and width at m rho =770.8-2.7+2.6</mml:msubsup><mml:mspace width="3.33333pt"></mml:mspace>(tot.)<mml:mspace width="3.33333pt"></mml:mspace>MeV and Gamma rho =151.3-3.6+2.7</mml:msubsup><mml:mspace width="3.33333pt"></mml:mspace>(tot.)<mml:mspace width="3.33333pt"></mml:mspace>MeV, respectively. The model is used to extract the rho 0(770) contribution to the pi+pi- cross sections and measure it as a function of t and W gamma p. In a Regge asymptotic limit in which one Regge trajectory alpha (t) dominates, the intercept alpha (t=0)=1.0654<mml:mspace width="4pt"></mml:mspace>-0.0067+0.0098<mml:mspace width="3.33333pt"></mml:mspace>(tot.) and the slope alpha ' (t=0)=0.233-0.074+0.067<mml:mspace width="3.33333pt"></mml:mspace>(tot.)<mml:mspace width="3.33333pt"></mml:mspace>GeV-2 of the t dependence are extracted for the case <mml:msub>mY=<mml:msub>mp.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6044
e-ISSN
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Volume of the periodical
80
Issue of the periodical within the volume
12
Country of publishing house
DE - GERMANY
Number of pages
54
Pages from-to
1189
UT code for WoS article
000603036300007
EID of the result in the Scopus database
2-s2.0-85098005273