Exclusive $\rho^0$ Meson Photoproduction with a Leading Neutron at HERA

H1 Collaboration; Zomer, Fabian; Hreus, Tomas; Tsakov, Ivan; Straumann, Ulrich; Bolz, Arthur; Brisson, Violette; Spaskov, Vladimir; Kogler, Roman; Boudry, Vincent; Schoeffel, Laurent; Shushkevich, Stanislav; Grab, Christoph; Specka, Arnd; Kapichine, Mikhail; Meyer, Joachim; Salek, David; Bylinkin, Alexander; Sopicki, Pawel; Van Mechelen, Pierre; Campbell, Alan; Feltesse, Joel; Tseepeldorj, Baatar; Jacquet, Marie; Kretzschmar, Jan; Krueger, Katja; Huber, Florian; Zhang, Zhiqing; South, David; Olsson, Jan-Erik; Kleinwort, Claus; Cerny, Karel; Robmann, Peter; Horisberger, Roland; Dodonov, Vitaliy; Vazdik, Yakov; Wegener, Dietrich; List, Jenny; Gayler, Joerg; Maxfield, Steve; Radescu, Voica; Ghazaryan, Samvel; Pascaud, Christian; Lobodzinski, Bogdan; Cantun Avila, Karla Beatriz; Belousov, Anatoli S.; Fleischer, Manfred; Ravdandorj, Togoo; Daum, Karin; Kostka, Peter; Sefkow, Felix; Hoffmann, Dirk; Sauter, Michel; Bystritskaya, Lena; Roosen, Robert; Eckerlin, Guenter; Polifka, Richard; Pirumov, Hayk; Baghdasaryan, Artem; Nowak, Grazyna; Goerlich, Lidia; Žlebcík, Radek; Fomenko, Alexander; Ozerov, Dmitri; Favart, Laurent; Naumann, Thomas; Meyer, Andreas; Reimer, Petr; Soloviev, Yuri; Levonian, Serguei V.; Sauvan, Emmanuel; Thompson, Paul; Brandt, Gerhard; Stella, Bruno; Lebedev, Andrei I.; Schoening, Andre; Picuric, Ivana; Haidt, Dieter; Rusakov, Serguei V.; Egli, Stephan; Dainton, John; Buniatyan, Armen; Pitzl, Daniel; Turnau, Jacek; Povh, Bogdan; Dobre, Monica; Placakyte, Ringaile; Patel, Girish; Britzger, Daniel; Elsen, Eckhard; Klein, Max; Sykora, Tomas; Grebenyuk, Anastasia; Andreev, Vladimir; List, Benno; Schmitt, Stefan; Greenshaw, Timothy; Petrukhin, Alexey; Pokorny, Boris; Rizvi, Eram; Meyer, Hinrich; Chekelian, Vladimir; Valkarova, Alice; Gabathuler, Erwin; Vallee, Claude; Wuensch, Eberhard; Hladky, Jan; Begzsuren, Khurelbaatar; Mikocki, Stanislav; Gouzevitch, Maxime; Diaconu, Cristinel; Mueller, Katharina; Lange, Wolfgang; Rotaru, Marina; Martyn, Hans-Ulrich; Sankey, David; Zacek, Jozef; Raicevic, Natasa; Cvach, Jaroslav; Henderson, Robert; Perez, Emmanuelle; Traynor, Daniel; Laycock, Paul; Janssen, Xavier; Niebuhr, Carsten; Gogitidze, Nelly; Newman, Paul R.; Truoel, Peter; Rostovtsev, Andrei; Mehta, Andrew; Ferencei, Jozef; Lipka, Katerina; Malinovski, Evgenij; Grindhammer, Guenter; Fedotov, Alexandre; Contreras, J. Guillermo; Zohrabyan, Hamlet; Jung, Hannes; Morozov, Anatoli; Kiesling, Christian; Steder, Michael; Landon, Murrough

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

TY  - JOUR
AU  - Andreev, Vladimir
AU  - Baghdasaryan, Artem
AU  - Begzsuren, Khurelbaatar
AU  - Belousov, Anatoli S.
AU  - Bolz, Arthur
AU  - Boudry, Vincent
AU  - Brandt, Gerhard
AU  - Brisson, Violette
AU  - Britzger, Daniel
AU  - Buniatyan, Armen
AU  - Bylinkin, Alexander
AU  - Bystritskaya, Lena
AU  - Campbell, Alan
AU  - Cantun Avila, Karla Beatriz
AU  - Cerny, Karel
AU  - Chekelian, Vladimir
AU  - Contreras, J. Guillermo
AU  - Cvach, Jaroslav
AU  - Dainton, John
AU  - Daum, Karin
AU  - Diaconu, Cristinel
AU  - Dobre, Monica
AU  - Dodonov, Vitaliy
AU  - Eckerlin, Guenter
AU  - Egli, Stephan
AU  - Elsen, Eckhard
AU  - Favart, Laurent
AU  - Fedotov, Alexandre
AU  - Feltesse, Joel
AU  - Ferencei, Jozef
AU  - Fleischer, Manfred
AU  - Fomenko, Alexander
AU  - Gabathuler, Erwin
AU  - Gayler, Joerg
AU  - Ghazaryan, Samvel
AU  - Goerlich, Lidia
AU  - Gogitidze, Nelly
AU  - Gouzevitch, Maxime
AU  - Grab, Christoph
AU  - Grebenyuk, Anastasia
AU  - Greenshaw, Timothy
AU  - Grindhammer, Guenter
AU  - Haidt, Dieter
AU  - Henderson, Robert
AU  - Hladky, Jan
AU  - Hoffmann, Dirk
AU  - Horisberger, Roland
AU  - Hreus, Tomas
AU  - Huber, Florian
AU  - Jacquet, Marie
AU  - Janssen, Xavier
AU  - Jung, Hannes
AU  - Kapichine, Mikhail
AU  - Kiesling, Christian
AU  - Klein, Max
AU  - Kleinwort, Claus
AU  - Kogler, Roman
AU  - Kostka, Peter
AU  - Kretzschmar, Jan
AU  - Krueger, Katja
AU  - Landon, Murrough
AU  - Lange, Wolfgang
AU  - Laycock, Paul
AU  - Lebedev, Andrei I.
AU  - Levonian, Serguei V.
AU  - Lipka, Katerina
AU  - List, Benno
AU  - List, Jenny
AU  - Lobodzinski, Bogdan
AU  - Malinovski, Evgenij
AU  - Martyn, Hans-Ulrich
AU  - Maxfield, Steve
AU  - Mehta, Andrew
AU  - Meyer, Andreas
AU  - Meyer, Hinrich
AU  - Meyer, Joachim
AU  - Mikocki, Stanislav
AU  - Morozov, Anatoli
AU  - Mueller, Katharina
AU  - Naumann, Thomas
AU  - Newman, Paul R.
AU  - Niebuhr, Carsten
AU  - Nowak, Grazyna
AU  - Olsson, Jan-Erik
AU  - Ozerov, Dmitri
AU  - Pascaud, Christian
AU  - Patel, Girish
AU  - Perez, Emmanuelle
AU  - Petrukhin, Alexey
AU  - Picuric, Ivana
AU  - Pirumov, Hayk
AU  - Pitzl, Daniel
AU  - Placakyte, Ringaile
AU  - Pokorny, Boris
AU  - Polifka, Richard
AU  - Povh, Bogdan
AU  - Radescu, Voica
AU  - Raicevic, Natasa
AU  - Ravdandorj, Togoo
AU  - Reimer, Petr
AU  - Rizvi, Eram
AU  - Robmann, Peter
AU  - Roosen, Robert
AU  - Rostovtsev, Andrei
AU  - Rotaru, Marina
AU  - Rusakov, Serguei V.
AU  - Salek, David
AU  - Sankey, David
AU  - Sauter, Michel
AU  - Sauvan, Emmanuel
AU  - Schmitt, Stefan
AU  - Schoeffel, Laurent
AU  - Schoening, Andre
AU  - Sefkow, Felix
AU  - Shushkevich, Stanislav
AU  - Soloviev, Yuri
AU  - Sopicki, Pawel
AU  - South, David
AU  - Spaskov, Vladimir
AU  - Specka, Arnd
AU  - Steder, Michael
AU  - Stella, Bruno
AU  - Straumann, Ulrich
AU  - Sykora, Tomas
AU  - Thompson, Paul
AU  - Traynor, Daniel
AU  - Truoel, Peter
AU  - Tsakov, Ivan
AU  - Tseepeldorj, Baatar
AU  - Turnau, Jacek
AU  - Valkarova, Alice
AU  - Vallee, Claude
AU  - Van Mechelen, Pierre
AU  - Vazdik, Yakov
AU  - Wegener, Dietrich
AU  - Wuensch, Eberhard
AU  - Zacek, Jozef
AU  - Zhang, Zhiqing
AU  - Žlebcík, Radek
AU  - Zohrabyan, Hamlet
AU  - Zomer, Fabian
TI  - Exclusive ρ<sup>0</sup> Meson Photoproduction with a Leading Neutron at HERA
JO  - The European physical journal / C
VL  - 76
IS  - DESY-15-120
SN  - 1434-6044
CY  - Berlin
PB  - Springer
M1  - PUBDB-2016-01381
M1  - DESY-15-120
M1  - arxiv:1508.03176
SP  - 41
PY  - 2015
AB  - A first measurement is presented of exclusive photoproduction of ρ<sup>0</sup> 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<sup>−1</sup>. The ρ<sup>0</sup> mesons with transverse momenta p<sub>T</sub> < 1 GeV are reconstructed from their decays to charged pions, while leading neutrons carrying a large fraction of the incoming proton momentum, x<sub>L</sub> > 0.35, are detected in the Forward Neutron Calorimeter. The phase space of the measurement is defined by the photon virtuality Q<sup>2</sup>  <  2 GeV<sup>2</sup>, the total energy of the photon-proton system 20  <  W<sub>γp</sub>  <  100 GeV and the polar angle of the leading neutron θ<sub>n</sub>  <  0.75 mrad. The cross section of the reaction γp → ρ<sup>0</sup> n π<sup>+</sup> 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 ρ<sup>0</sup> meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, σ<sup>el</sup>(γπ<sup>+</sup> → ρ<sup>0</sup>π<sup>+</sup>), is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction γp→ρ<sup>0</sup> n π<sup>+</sup>.
LB  - PUB:(DE-HGF)29 ; PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000370646800001
DO  - DOI:10.1140/epjc/s10052-015-3863-1
UR  - https://bib-pubdb1.desy.de/record/296300
ER  -

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