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Exclusive $$\rho ^0$$ ρ 0 meson photoproduction with a leading neutron at HERA

V. Andreev,A. Baghdasaryan,K. Begzsuren,A. Belousov,Arthur Eugen Bolz,V. Boudry,G. Brandt,V. Brisson,Daniel Andreas Britzger,A. Buniatyan,Alexander Bylinkin,L. Bystritskaya,Alan Campbell,K. B. Cantun Avila,Karel Černý,V. Chekelian,J. G. Contreras,J. Cvach,J. B. Dainton,K. Daum,Cristinel Diaconu,Monica Dobre,V. Dodonov,Guenter Eckerlin,S. Egli,E. Elsen,Laurent Favart,A. Fedotov,J. Feltesse,J. Ferencei,M. Fleischer,A. Fomenko,E. Gabathuler,J. Gayler,S. Ghazaryan,L. Goerlich,N. Gogitidze,Maxime Gouzevitch,Christoph Grab,Anastasia Grebenyuk,T. Greenshaw,G. Grindhammer,D. Haidt,Robert Henderson,J. Hladký,D. Hoffmann,Roland Horisberger,T. Hreus,Florian Huber,M. Jacquet,X. Janssen,Hannes Jung,M. Kapichine,C. Kiesling,M. Klein,Claus Kleinwort,Roman Kogler,P. Kostka,J. Kretzschmar,K. Krüger,Murrough Landon,W. Lange,P. Laycock,A. Lebedev,S. Levonian,Katerina Lipka,B. List,Jenny List,B. Łobodziński,E. Malinovski,H. U. Martyn,S. J. Maxfield,Ankita Mehta,A. Meyer,H. Meyer,J. Meyer,S. Mikocki,A. Morozov,Katharina Müller,T. Naumann,P. R. Newman,C. Niebuhr,G. Nowak,J. E. Olsson,D. Ozerov,C. Pascaud,G. D. Patel,Emmanuel Perez,A. Petrukhin,I. Pićurić,H. Pirumov,Daniel Pitzl,R. Plačakytė,B. Pokorny,Richard Polifka,Bogdan Povh,V. Radescu,Nataša Raičević,T. Ravdandorj,P. Reimer,E. Rizvi,Peter Robmann,R. Roosen,A. Rostovtsev,Marina Rotaru,S. V. Rusakov,D. Šálek,D. P. C. Sankey,M. Sauter,E. Sauvan,Stefan Schmitt,L. Schoeffel,A. Schöning,F. Sefkow,S. Shushkevich,Y. Soloviev,P. Sopicki,David South,V. Spaskov,A. Specka,M. Steder,B. Stella,U. Straumann,Tomáš Sýkora,P. D. Thompson,D. Traynor,P. Truöl,I. Tsakov,B. Tseepeldorj,J. Turnau,A. Valkárová,C. Vallée,P. Van Mechelen,Y. Vazdik,D. Wegener,E. Wünsch,J. Žáček,Z. Zhang,Radek Žlebčík,H. Zohrabyan,F. Zomer

Physics

Nuclear physics

Pion

2016

A first measurement is presented of exclusive photoproduction of $$\rho ^0$$ mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of $$\sqrt{s}=319$$ GeV and correspond to an integrated luminosity of 1.16 pb $$^{-1}$$ . The $$\rho ^0$$ mesons with transverse momenta $$p_T<1$$ GeV are reconstructed from their decays to charged pions, while leading neutrons carrying a large fraction of the incoming proton momentum, $$x_L>0.35$$ , are detected in the Forward Neutron Calorimeter. The phase space of the measurement is defined by the photon virtuality $$Q^2 < 2$$ GeV $$^2$$ , the total energy of the photon–proton system $$20 < W_{\gamma p}< 100$$ GeV and the polar angle of the leading neutron $$\theta _n < 0.75$$ mrad. The cross section of the reaction $$\gamma p \rightarrow \rho ^0 n \pi ^+$$ is measured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the proton vertex followed by elastic photoproduction of a $$\rho ^0$$ meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, $$\sigma ^\mathrm{el}(\gamma \pi ^+ \rightarrow \rho ^0\pi ^+)$$ , is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction $$\gamma p \rightarrow \rho ^0 n \pi ^+$$ .

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“Exclusive $$\rho ^0$$ ρ 0 meson photoproduction with a leading neutron at HERA” is a paper by V. Andreev A. Baghdasaryan K. Begzsuren A. Belousov Arthur Eugen Bolz V. Boudry G. Brandt V. Brisson Daniel Andreas Britzger A. Buniatyan Alexander Bylinkin L. Bystritskaya Alan Campbell K. B. Cantun Avila Karel Černý V. Chekelian J. G. Contreras J. Cvach J. B. Dainton K. Daum Cristinel Diaconu Monica Dobre V. Dodonov Guenter Eckerlin S. Egli E. Elsen Laurent Favart A. Fedotov J. Feltesse J. Ferencei M. Fleischer A. Fomenko E. Gabathuler J. Gayler S. Ghazaryan L. Goerlich N. Gogitidze Maxime Gouzevitch Christoph Grab Anastasia Grebenyuk T. Greenshaw G. Grindhammer D. Haidt Robert Henderson J. Hladký D. Hoffmann Roland Horisberger T. Hreus Florian Huber M. Jacquet X. Janssen Hannes Jung M. Kapichine C. Kiesling M. Klein Claus Kleinwort Roman Kogler P. Kostka J. Kretzschmar K. Krüger Murrough Landon W. Lange P. Laycock A. Lebedev S. Levonian Katerina Lipka B. List Jenny List B. Łobodziński E. Malinovski H. U. Martyn S. J. Maxfield Ankita Mehta A. Meyer H. Meyer J. Meyer S. Mikocki A. Morozov Katharina Müller T. Naumann P. R. Newman C. Niebuhr G. Nowak J. E. Olsson D. Ozerov C. Pascaud G. D. Patel Emmanuel Perez A. Petrukhin I. Pićurić H. Pirumov Daniel Pitzl R. Plačakytė B. Pokorny Richard Polifka Bogdan Povh V. Radescu Nataša Raičević T. Ravdandorj P. Reimer E. Rizvi Peter Robmann R. Roosen A. Rostovtsev Marina Rotaru S. V. Rusakov D. Šálek D. P. C. Sankey M. Sauter E. Sauvan Stefan Schmitt L. Schoeffel A. Schöning F. Sefkow S. Shushkevich Y. Soloviev P. Sopicki David South V. Spaskov A. Specka M. Steder B. Stella U. Straumann Tomáš Sýkora P. D. Thompson D. Traynor P. Truöl I. Tsakov B. Tseepeldorj J. Turnau A. Valkárová C. Vallée P. Van Mechelen Y. Vazdik D. Wegener E. Wünsch J. Žáček Z. Zhang Radek Žlebčík H. Zohrabyan F. Zomer published in 2016. It has an Open Access status of “gold”. You can read and download a PDF Full Text of this paper here.