Springer : Measurement of exclusive $\pi^+ \pi ^-$ and $\rho^0$ meson photoproduction at HERA

Andreev, V.; Lebedev, A.; Jung, A.W.; Vallée, C.; Eckerlin, G.; Gouzevitch, M.; Baghdasaryan, A.; Britzger, D.; Chekelian, V.; Žlebčík, R.; Janssen, X.; Laycock, P.; Henderson, R.C.W.; Egli, S.; Picuric, I.; Wünsch, E.; Park, S.; Baty, A.; Hreus, T.; Cantun Avila, K.B.; Huber, F.; Kapichine, M.; Cerny, K.; Contreras, J.G.; Lipka, K.; Spaskov, V.; Valkárová, A.; Petrukhin, A.; Sankey, D.P.C.; Truöl, P.; Favart, L.; Jung, H.; Li, W.; Katzy, J.; Rizvi, E.; Van Mechelen, P.; Krüger, K.; Patel, G.D.; Polifka, R.; Jacquet, M.; Fleischer, M.; Grebenyuk, A.; Lobodzinski, B.; Landon, M.P.J.; Hoffmann, D.; Martyn, H.-U.; Steder, M.; Daum, K.; Thompson, P.D.; Roosen, R.; Krücker, D.; Begzsuren, K.; Wegener, D.; Elsen, E.; Perez, E.; Tu, Z.; Gayler, J.; Kleinwort, C.; Ravdandorj, T.; Olsson, J.E.; Goerlich, L.; Feltesse, J.; Brandt, G.; Shushkevich, S.; Fomenko, A.; Pitzl, D.; Newman, P.R.; Dainton, J.B.; Mehta, A.; List, B.; Bolz, A.; Meyer, J.; Radescu, V.; Gal, C.; Levonian, S.; List, J.; Grindhammer, G.; Greenshaw, T.; Tseepeldorj, B.; Buniatyan, A.; Kostka, P.; Reimer, P.; Kretzschmar, J.; Chen, Z.; Soloviev, Y.; Zhang, Z.; Maxfield, S.J.; Hladky, J.; Diaconu, C.; Meyer, A.B.; Malinovski, E.; Schmitt, S.; Nowak, G.; Traynor, D.; Pascaud, C.; Ozerov, D.; Campbell, A.J.; Müller, K.; Boudry, V.; Morozov, A.; Raicevic, N.; Sauvan, E.; Žáček, J.; Schmookler, B.A.; Meyer, H.; Rostovtsev, A.; Straumann, U.; Niebuhr, C.; Fedotov, A.; Schoeffel, L.; Sauter, M.; Gogitidze, N.; South, D.; Grab, C.; Bystritskaya, L.; Mikocki, S.; Naumann, Th.; Sykora, T.; Zhang, J.; Kogler, R.; Zomer, F.; Cvach, J.; Sopicki, P.; Zohrabyan, H.; Haidt, D.; Lange, W.; Deshpande, A.; Sefkow, F.; Horisberger, R.; Stella, B.; Rotaru, M.; Klein, M.; Mondal, M.M.; Belousov, A.; Schöning, A.; Specka, A.; Kiesling, C.; Robmann, P.

doi:10.1140/epjc/s10052-020-08587-3

Article
Report number	arXiv:2005.14471 ; DESY-20-080
Title	Measurement of exclusive $\pi^+ \pi ^-$ and $\rho^0$ meson photoproduction at HERA
Related title	Measurement of Exclusive $\pi^{+}\pi^{-}$ and $\rho^0$ Meson Photoproduction at HERA
Author(s)	Andreev, V. (Lebedev Inst.) ; Baghdasaryan, A. (Yerevan Phys. Inst.) ; Baty, A. (Rice U.) ; Begzsuren, K. (Ulan Bator, Inst. Phys. Tech.) ; Belousov, A. (Lebedev Inst.) ; Bolz, A. (DESY ; Heidelberg U.) ; Boudry, V. (Ecole Polytechnique) ; Brandt, G. (Gottingen U., II. Phys. Inst.) ; Britzger, D. (Munich, Max Planck Inst.) ; Buniatyan, A. (Birmingham U.) ; Bystritskaya, L. (Moscow, ITEP) ; Campbell, A.J. (DESY) ; Cantun Avila, K.B. (Merida, IPN) ; Cerny, K. (Palacky U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Chen, Z. (Shandong U.) ; Contreras, J.G. (Merida, IPN) ; Cvach, J. (Cracow, INP) ; Dainton, J.B. (Liverpool U.) ; Daum, K. (Wuppertal U.) ; Deshpande, A. (SUNY, Stony Brook) ; Diaconu, C. (Marseille, CPPM) ; Eckerlin, G. (DESY) ; Egli, S. (PSI, Villigen) ; Elsen, E. (CERN) ; Favart, L. (Brussels U., IIHE) ; Fedotov, A. (Moscow, ITEP) ; Feltesse, J. (IRFU, SPP, Saclay) ; Fleischer, M. (DESY) ; Fomenko, A. (Lebedev Inst.) ; Gal, C. (SUNY, Stony Brook) ; Gayler, J. (DESY) ; Goerlich, L. (Cracow, INP) ; Gogitidze, N. (Lebedev Inst.) ; Gouzevitch, M. (Lyon, IPN) ; Grab, C. (Zurich, ETH) ; Grebenyuk, A. (Brussels U., IIHE) ; Greenshaw, T. (Liverpool U.) ; Grindhammer, G. (Munich, Max Planck Inst.) ; Haidt, D. (DESY) ; Henderson, R.C.W. (Lancaster U.) ; Hladky, J. (Cracow, INP) ; Hoffmann, D. (Marseille, CPPM) ; Horisberger, R. (PSI, Villigen) ; Hreus, T. (Brussels U., IIHE) ; Huber, F. (Heidelberg U.) ; Jacquet, M. (Orsay, LAL) ; Janssen, X. (Brussels U., IIHE) ; Jung, A.W. (Purdue U.) ; Jung, H. (DESY) ; Kapichine, M. (Dubna, JINR) ; Katzy, J. (DESY) ; Kiesling, C. (Munich, Max Planck Inst.) ; Klein, M. (Liverpool U.) ; Kleinwort, C. (DESY) ; Kogler, R. (Hamburg U.) ; Kostka, P. (Liverpool U.) ; Kretzschmar, J. (Liverpool U.) ; Krücker, D. (DESY) ; Krüger, K. (DESY) ; Landon, M.P.J. (Queen Mary, U. of London) ; Lange, W. (DESY, Zeuthen) ; Laycock, P. (Liverpool U.) ; Lebedev, A. (Lebedev Inst.) ; Levonian, S. (DESY) ; Lipka, K. (DESY) ; List, B. (DESY) ; List, J. (DESY) ; Li, W. (Rice U.) ; Lobodzinski, B. (Munich, Max Planck Inst.) ; Malinovski, E. (Lebedev Inst.) ; Martyn, H.-U. (RWTH Aachen U.) ; Maxfield, S.J. (Liverpool U.) ; Mehta, A. (Liverpool U.) ; Meyer, A.B. (DESY) ; Meyer, H. (Wuppertal U.) ; Meyer, J. (DESY) ; Mikocki, S. (Cracow, INP) ; Mondal, M.M. (SUNY, Stony Brook) ; Morozov, A. (Dubna, JINR) ; Müller, K. (Zurich U.) ; Naumann, Th. (DESY) ; Newman, P.R. (Birmingham U.) ; Niebuhr, C. (DESY) ; Nowak, G. (Cracow, INP) ; Olsson, J.E. (DESY) ; Ozerov, D. (PSI, Villigen) ; Park, S. (SUNY, Stony Brook) ; Pascaud, C. (Orsay, LAL) ; Patel, G.D. (Liverpool U.) ; Perez, E. (CERN) ; Petrukhin, A. (Lyon, IPN) ; Picuric, I. (Montenegro U.) ; Pitzl, D. (DESY) ; Polifka, R. (Charles U.) ; Radescu, V. (Oxford U.) ; Raicevic, N. (Montenegro U.) ; Ravdandorj, T. (Ulan Bator, Inst. Phys. Tech.) ; Reimer, P. (Cracow, INP) ; Rizvi, E. (Queen Mary, U. of London) ; Robmann, P. (Zurich U.) ; Roosen, R. (Brussels U., IIHE) ; Rostovtsev, A. (IITP, Moscow) ; Rotaru, M. (Bucharest, IFIN-HH) ; Sankey, D.P.C. (Rutherford) ; Sauter, M. (Heidelberg U.) ; Sauvan, E. (Marseille, CPPM ; Annecy, LAPP) ; Schmitt, S. (DESY) ; Schmookler, B.A. (SUNY, Stony Brook) ; Schoeffel, L. (IRFU, SPP, Saclay) ; Schöning, A. (Heidelberg U.) ; Sefkow, F. (DESY) ; Shushkevich, S. (Moscow State U.) ; Soloviev, Y. (Lebedev Inst.) ; Sopicki, P. (Cracow, INP) ; South, D. (DESY) ; Spaskov, V. (Dubna, JINR) ; Specka, A. (Ecole Polytechnique) ; Steder, M. (DESY) ; Stella, B. (Rome III U.) ; Straumann, U. (Zurich U.) ; Sykora, T. (Charles U.) ; Thompson, P.D. (Birmingham U.) ; Traynor, D. (Queen Mary, U. of London) ; Truöl, P. (Zurich U.) ; Tseepeldorj, B. (Ulan Bator, Inst. Phys. Tech. ; Mongolian Natl. U.) ; Tu, Z. (Brookhaven) ; Valkárová, A. (Charles U.) ; Vallée, C. (Marseille, CPPM) ; Van Mechelen, P. (Brussels U., IIHE) ; Wegener, D. (Dortmund U.) ; Wünsch, E. (DESY) ; Žáček, J. (Charles U.) ; Zhang, J. (SUNY, Stony Brook) ; Zhang, Z. (Orsay, LAL) ; Žlebčík, R. (DESY) ; Zohrabyan, H. (Yerevan Phys. Inst.) ; Zomer, F. (Orsay, LAL)
Publication	2020-12-23
Imprint	2020-05-29
Number of pages	54
Note	74 pages, 20 figures, 23 tables, accepted by EPJC. Figure numbering updated. Ancillary material has been updated
In:	Eur. Phys. J. C 80 (2020) 1189
DOI	10.1140/epjc/s10052-020-08587-3
Subject category	hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment	DESY HERA H1
Abstract	Exclusive photoproduction of $\rho^0(770)$ mesons is studied using the H1 detector at the $ep$ collider HERA. A sample of about 900000 events is used to measure single- and double-differential cross sections for the reaction $\gamma p \to \pi^{+}\pi^{-}Y$. Reactions where the proton stays intact (${m_Y{=}m_p}$) are statistically separated from those where the proton dissociates to a low-mass hadronic system ($m_p{<}m_Y{<}10$ 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 $0.5 < m_{\pi\pi} < 2.2$ GeV, ${\vert t\vert < 1.5}$ GeV${}^2$, and ${20 < W_{\gamma p} < 80}$ 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 $m_{\pi\pi}$ 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 $m_\rho = 770.8\ {}^{+2.6}_{-2.7}$ (tot) MeV and $\Gamma_\rho = 151.3\ {}^{+2.7}_{-3.6}$ (tot) 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 $\alpha(t{=}0) = 1.0654\ {}^{+0.0098}_{-0.0067}$ (tot) and the slope $\alpha^\prime(t{=}0) = 0.233\ {}^{+0.067 }_{-0.074 }$ (tot) GeV${}^{-2}$ of the $t$ dependence are extracted for the case $m_Y{=}m_p$.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: © 2020-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³

$Diagram of \myrho meson production and decay in elastic (left) and proton-dissociative (right) $ep$ scattering in the VDM and Regge picture, where the interaction is governed by soft pomeron exchange in the high energy limit.$ $Diagram of \myrho meson production and decay in elastic (left) and proton-dissociative (right) $ep$ scattering in the VDM and Regge picture, where the interaction is governed by soft pomeron exchange in the high energy limit.$ $Control distributions of the reconstructed \mpipirec on a linear (a) and logarithmic $y$-scale (b), of \wgprec (c), and of \trec (d). The black data points are compared to the MC simulation including various signal and background components as given in the legends. The dotted red bands denote the total uncertainty of the simulation including normalisation uncertainties.$ Show more plots

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