Exclusive ρ0 meson photoproduction with a leading neutron at HERA

Andreev, V.; Belousov, A.; Fomenko, A.; Gogitidze, N.; Lebedev, A.; Malinovski, E.; Rusakov, S.; Vazdik, Y.; Baghdasaryan, A.; Zohrabyan, H.; Begzsuren, K.; Ravdandorj, T.; Bolz, A.; Huber, F.; Radescu, V.; Sauter, M.; Schoening, A.; Boudry, V.; Specka, A.; Brandt, G.; Brisson, V.; Jacquet, M.; Pascaud, C.; Zhang, Z.; Zomer, F.; Britzger, D.; Campbell, A.J.; Dodonov, V.; Eckerlin, G.; Elsen, E.; Fleischer, M.; Gayler, J.; Ghazaryan, S.; Haidt, D.; Kleinwort, C.; Krueger, K.; Levonian, S.; Lipka, K.; List, B.; List, J.; Meyer, A.B.; Meyer, J.; Niebuhr, C.; Olsson, J.E.; Ozerov, D.; Pirumov, H.; Pitzl, D.; Placakyte, R.; Schmitt, S.; Sefkow, F.; Shushkevich, S.; South, D.; Steder, M.; Wuensch, E.; Buniatyan, A.; Newman, P.R.; Thompson, P.D.; Bylinkin, A.; Bystritskaya, L.; Fedotov, A.; Cantun Avila, K.B.; Contreras, J.G.; Cerny, K.; Pokorny, B.; Salek, D.; Valkarova, A.; Zacek, J.; Zlebcik, R.; Chekelian, V.; Grindhammer, G.; Kiesling, C.; Lobodzinski, B.; Cvach, J.; Hladka, J.; Reimer, P.; Dainton, J.B.; Gabathuler, E.; Greenshaw, T.; Klein, M.; Kostka, P.; Kretzschmar, J.; Laycock, P.; Maxfield, S.J.; Mehta, A.; Patel, G.D.; Daum, K.; Diaconu, C.; Hoffmann, D.; Vallee, C.; Dobre, M.; Rotaru, M.; Egli, S.; Horisberger, R.; Favart, L.; Grebenyuk, A.; Hreus, T.; Janssen, X.; Roosen, R.; Van Mechelen, P.; Feltesse, J.; Schoeffel, L.; Ferencei, J.; Goerlich, L.; Mikocki, S.; Nowak, G.; Sopicki, P.; Turnau, J.; Gouzevitch, M.; Petrukhin, A.; Grab, C.; Henderson, R.C.W.; Jung, H.; Kapichine, M.; Morozov, A.; Spaskov, V.; Kogler, R.; Landon, M.P.J.; Rizvi, E.; Traynor, D.; Lange, W.; Naumann, T.; Martyn, H.U.; Meyer, H.; Mueller, K.; Robmann, P.; Straumann, U.; Truoel, P.; Perez, E.; Picuric, I.; Raicevic, N.; Polifka, R.; Povh, B.; Rostovtsev, A.; Sankey, D.P.C.; Sauvan, E.; Soloviev, Y.; Stella, B.; Sykora, T.; Tsakov, I.; Tseepeldorj, B.; Wegener, D.; H1 Collaboration

doi:10.1140/epjc/s10052-015-3863-1

Published January 2016 | Version v1

Journal article Metadata-only

Exclusive ρ⁰ meson photoproduction with a leading neutron at HERA

1. Lebedev Physical Institute, Moscow (Russian Federation)
2. Yerevan Physics Institute, Yerevan (Armenia)
3. Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar (Mongolia)
4. Universitaet Heidelberg, Physikalisches Institut, Heidelberg (Germany)
5. LLR, Ecole Polytechnique, CNRS/IN2P3, Palaiseau (France)
6. Universitaet Goettingen, II. Physikalisches Institut, Goettingen (Germany)
7. LAL, Universite Paris-Sud, CNRS/IN2P3, Orsay (France)
8. DESY, Hamburg (Germany)
9. University of Birmingham, School of Physics and Astronomy, Birmingham (United Kingdom)
10. Moscow Institute of Physics and Technology, Moscow (Russian Federation)
11. Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
12. CINVESTAV, Departamento de Fisica Aplicada, Merida, Yucatan (Mexico)
13. Charles University, Faculty of Mathematics and Physics, Prague (Czech Republic)
14. Max-Planck-Institut fuer Physik, Munich (Germany)
15. Academy of Sciences of the Czech Republic, Institute of Physics, Prague (Czech Republic)
16. University of Liverpool, Department of Physics, Liverpool (United Kingdom)
17. Universitaet Wuppertal, Rechenzentrum, Wuppertal (Germany)
18. Fachbereich C, Universitaet Wuppertal, Wuppertal (Germany)
19. Aix Marseille Universite, CNRS/IN2P3, CPPM UMR 7346, Marseille (France)
20. Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (IFIN-HH), Bucharest (Romania)
21. Paul Scherrer Institut, Villigen (Switzerland)
22. Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp (Belgium)
23. Irfu/SPP, CE Saclay, Gif-sur-Yvette Cedex (France)
24. Slovak Academy of Sciences, Institute of Experimental Physics, Kosice (Slovakia)
25. Institute of Nuclear Physics Polish Academy of Sciences, Krakow (Poland)
26. IPNL, Universite Claude Bernard Lyon 1, CNRS/IN2P3, Villeurbanne (France)
27. Institut fuer Teilchenphysik, ETH, Zurich (Switzerland)
28. University of Lancaster, Department of Physics, Lancaster (United Kingdom)
29. Joint Institute for Nuclear Research, Dubna (RU)
30. Universitaet Hamburg, Institut fuer Experimentalphysik, Hamburg (DE)
31. Queen Mary, University of London, School of Physics and Astronomy, London (GB)
32. DESY, Zeuthen (DE)
33. I. Physikalisches Institut der RWTH, Aachen (DE)
34. Fachbereich C, Universitaet Wuppertal, Wuppertal (DE)
35. Physik-Institut der Universitaet Zuerich, Zurich (CH)
36. CERN, Geneva (CH)
37. University of Montenegro, Faculty of Science, Podgorica (ME)
38. University of Toronto, Department of Physics, Toronto, ON (CA)
39. Charles University, Faculty of Mathematics and Physics, Prague (CZ)
40. Max-Planck-Institut fuer Kernphysik, Heidelberg (DE)
41. Institute for Information Transmission Problems RAS, Moscow (RU)
42. STFC, Rutherford Appleton Laboratory, Didcot, Oxfordshire (GB)
43. Universite de Savoie, CNRS/IN2P3, LAPP, Annecy-le-Vieux (FR)
44. Aix Marseille Universite, CNRS/IN2P3, CPPM UMR 7346, Marseille (FR)
45. Lebedev Physical Institute, Moscow (RU)
46. DESY, Hamburg (DE)
47. INFN Roma 3 (IT)
48. Universita di Roma Tre, Dipartimento di Fisica, Rome (IT)
49. Inter-University Institute for High Energies ULB-VUB, Brussels and Universiteit Antwerpen, Antwerp (BE)
50. Institute for Nuclear Research and Nuclear Energy, Sofia (BG)
51. Ulaanbaatar University, Ulaanbaatar (MN)
52. Institute of Physics and Technology of the Mongolian Academy of Sciences, Ulaanbaatar (MN)
53. TU Dortmund, Institut fuer Physik, Dortmund (DE)

A first measurement is presented of exclusive photoproduction of ρ⁰ 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 √(s) = 319 GeV and correspond to an integrated luminosity of 1.16 pb^-1. The ρ⁰ 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 Q² < 2 GeV², the total energy of the photon.proton system 20 < W_γp < 100 GeV and the polar angle of the leading neutron θ_n < 0.75 mrad. The cross section of the reaction γp → ρ⁰nπ⁺ 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 ρ⁰ meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, σ^el(γπ⁺ → ρ⁰π⁺), is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction γp → ρ⁰nπ⁺. (orig.)

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Available from: http://dx.doi.org/10.1140/epjc/s10052-015-3863-1

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DOI: 10.1140/epjc/s10052-015-3863-1;

Journal Title: European Physical Journal. C, Particles and Fields (Online)
Journal Volume: 76
Journal Issue: 1
Journal Page Range: p. 1-21
ISSN: 1434-6052

Country of Publication: Germany
Country of Input or Organization: Germany
INIS RN: 47053684
Subject category: S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
Resource subtype / Literary indicator: Numerical Data
Descriptors DEI: ANTILEPTON-PROTON INTERACTIONS; EXCITATION FUNCTIONS; EXCLUSIVE INTERACTIONS; EXPERIMENTAL DATA; GEV RANGE 100-1000; GEV RANGE 10-100; INTEGRAL CROSS SECTIONS; NEUTRONS; PARTICLE RAPIDITY; PHOTON-MESON INTERACTIONS; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; PIONS PLUS; POSITRONS; RHO-770 MESONS; TRANSVERSE MOMENTUM
Descriptors DEC: ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; BARYONS; BASIC INTERACTIONS; BOSONS; CROSS SECTIONS; DATA; DIFFERENTIAL CROSS SECTIONS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FUNCTIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; LEPTON-BARYON INTERACTIONS; LEPTON-HADRON INTERACTIONS; LEPTON-NUCLEON INTERACTIONS; LEPTON-PROTON INTERACTIONS; LEPTONS; LINEAR MOMENTUM; MATTER; MESONS; NUCLEONS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; PIONS; PSEUDOSCALAR MESONS; VECTOR MESONS

Collaborations: H1 Collaboration

Exclusive ρ⁰ meson photoproduction with a leading neutron at HERA

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Exclusive ρ0 meson photoproduction with a leading neutron at HERA

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Exclusive ρ⁰ meson photoproduction with a leading neutron at HERA