Measurement of charm fragmentation fractions in photoproduction at HERA

Author:

,Abramowicz H.,Abt I.,Adamczyk L.,Adamus M.,Aggarwal R.,Antonelli S.,Antonioli P.,Antonov A.,Arneodo M.,Arslan O.,Aushev V.,Aushev Y.,Bachynska O.,Bamberger A.,Barakbaev A.N.,Barbagli G.,Bari G.,Barreiro F.,Bartosik N.,Bartsch D.,Basile M.,Behnke O.,Behr J.,Behrens U.,Bellagamba L.,Bertolin A.,Bhadra S.,Bindi M.,Blohm C.,Bokhonov V.,Bold T.,Boos E.G.,Borras K.,Boscherini D.,Bot D.,Brock I.,Brownson E.,Brugnera R.,Brümmer N.,Bruni A.,Bruni G.,Brzozowska B.,Bussey P.J.,Bylsma B.,Caldwell A.,Capua M.,Carlin R.,Catterall C.D.,Chekanov S.,Chwastowski J.,Ciborowski J.,Ciesielski R.,Cifarelli L.,Cindolo F.,Contin A.,Cooper-Sarkar A.M.,Coppola N.,Corradi M.,Corriveau F.,Costa M.,D’Agostini G.,Corso F. Dal,del Peso J.,Dementiev R.K.,De Pasquale S.,Derrick M.,Devenish R.C.E.,Dobur D.,Dolgoshein B.A.,Dolinska G.,Doyle A.T.,Drugakov V.,Durkin L.S.,Dusini S.,Eisenberg Y.,Ermolov P.F.,Eskreys A.,Fang S.,Fazio S.,Ferrando J.,Ferrero M.I.,Figiel J.,Foster B.,Gach G.,Galas A.,Gallo E.,Garfagnini A.,Geiser A.,Gialas I.,Gizhko A.,Gladilin L.K.,Gladkov D.,Glasman C.,Gogota O.,Golubkov Yu.A.,Göttlicher P.,Grabowska-Bold I.,Grebenyuk J.,Gregor I.,Grigorescu G.,Grzelak G.,Gueta O.,Guzik M.,Gwenlan C.,Haas T.,Hain W.,Hamatsu R.,Hart J.C.,Hartmann H.,Hartner G.,Hilger E.,Hochman D.,Hori R.,Hüttmann A.,Ibrahim Z.A.,Iga Y.,Ingbir R.,Ishitsuka M.,Iudin A.,Jakob H.-P.,Januschek F.,Jones T.W.,Jüngst M.,Kadenko I.,Kahle B.,Kananov S.,Kanno T.,Karshon U.,Karstens F.,Katkov I.I.,Kaur M.,Kaur P.,Keramidas A.,Khein L.A.,Kim J.Y.,Kisielewska D.,Kitamura S.,Klanner R.,Klein U.,Koffeman E.,Kondrashova N.,Kononenko O.,Kooijman P.,Korol Ie.,Korzhavina I.A.,Kotanski A.,Kötz U.,Kovalchuk N.,Kowalski H.,Kuprash O.,Kuze M.,Lee A.,Levchenko B.B.,Levy A.,Libov V.,Limentani S.,Ling T.Y.,Lisovyi M.,Lobodzinska E.,Lohmann W.,Löhr B.,Lohrmann E.,Long K.R.,Longhin A.,Lontkovskyi D.,Lukina O.Yu.,Maeda J.,Magill S.,Makarenko I.,Malka J.,Mankel R.,Margotti A.,Marini G.,Martin J.F.,Mastroberardino A.,Mattingly M.C.K.,Melzer-Pellmann I.-A.,Mergelmeyer S.,Miglioranzi S.,Mohamad Idris F.,Monaco V.,Montanari A.,Morris J.D.,Mujkic K.,Musgrave B.,Myronenko V.,Nagano K.,Namsoo T.,Nania R.,Nigro A.,Ning Y.,Nobe T.,Notz D.,Nowak R.J.,Nuncio-Quiroz A.E.,Oh B.Y.,Okazaki N.,Olkiewicz K.,Onishchuk Yu.,Papageorgiu K.,Parenti A.,Paul E.,Pawlak J.M.,Pawlik B.,Pelfer P. G.,Pellegrino A.,Perlanski W.,Perrey H.,Piotrzkowski K.,Plucinski P.,Pokrovskiy N.S.,Polini A.,Proskuryakov A.S.,Przybycien M.,Raval A.,Reeder D.D.,Reisert B.,Ren Z.,Repond J.,Ri Y.D.,Robertson A.,Roloff P.,Rubinsky I.,Ruspa M.,Sacchi R.,Samson U.,Sartorelli G.,Savin A.A.,Saxon D.H.,Schioppa M.,Schlenstedt S.,Schleper P.,Schmidke W.B.,Schneekloth U.,Schönberg V.,Schörner-Sadenius T.,Schwartz J.,Sciulli F.,Shcheglova L.M.,Shehzadi R.,Shevchenko R.,Shimizu S.,Shkola O.,Singh I.,Skillicorn I.O.,Slominski W.,Smith W.H.,Sola V.,Solano A.,Son D.,Sosnovtsev V.,Spiridonov A.,Stadie H.,Stanco L.,Stefaniuk N.,Stern A.,Stewart T.P.,Stifutkin A.,Stopa P.,Suchkov S.,Susinno G.,Suszycki L.,Sztuk-Dambietz J.,Szuba D.,Szuba J.,Tapper A.D.,Tassi E.,Terrón J.,Theedt T.,Tiecke H.,Tokushuku K.,Tomaszewska J.,Trofymov A.,Trusov V.,Tsurugai T.,Turcato M.,Turkot O.,Tymieniecka T.,Vázquez M.,Verbytskyi A.,Viazlo O.,Vlasov N.N.,Walczak R.,Wan Abdullah W.A.T.,Whitmore J.J.,Wichmann K.,Wiggers L.,Wing M.,Wlasenko M.,Wolf G.,Wolfe H.,Wrona K.,Yagües-Molina A.G.,Yamada S.,Yamazaki Y.,Yoshida R.,Youngman C.,Zakharchuk N.,Żarnecki A.F.,Zawiejski L.,Zenaiev O.,Zeuner W.,Zhautykov B.O.,Zhmak N.,Zichichi A.,Zolkapli Z.,Zotkin D.S.

Abstract

Abstract The production of D 0, D *+, D +, $ D_s^{+} $ and $ \Lambda_c^{+} $ charm hadrons and their antiparticles in ep scattering at HERA has been studied with the ZEUS detector, using a total integrated luminosity of 372 pb−1. The fractions of charm quarks hadronising into a particular charm hadron were derived. In addition, the ratio of neutral to charged D-meson production rates, the fraction of charged D mesons produced in a vector state, and the stangeness-suppression factor have been determined. The measurements have been performed in the photoproduction regime. The charm hadrons were reconstructed in the range of transverse momentum p T > 3.8 GeV and pseudorapidity |η| < 1.6. The charm fragmentation fractions are compared to previous results from HERA and from e + e experiments. The data support the hypothesis that fragmentation is independent of the production process.

Publisher

Springer Science and Business Media LLC

Subject

Nuclear and High Energy Physics

Reference57 articles.

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3. ZEUS collaboration, S. Chekanov et al., Measurement of D mesons production in deep inelastic scattering at HERA, JHEP 07 (2007) 074 [arXiv:0704.3562] [INSPIRE].

4. ZEUS collaboration, H. Abramowicz et al., Measurement of D + and $ \Lambda_c^{+} $ production in deep inelastic scattering at HERA, JHEP 11 (2010) 009 [arXiv:1007.1945] [INSPIRE].

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