/ Experiment-HEP hep-ex/0607046


A Measurement of the psi-prime to J / psi production ratio in 920-GeV proton-nucleus interactions


Abt, I. ; Adams, M. ; Agari, M. ; Albrecht, H. ; Aleksandrov, A. ; Amaral, V. ; Amorim, A. ; Aplin, S.J. ; Aushev, V. ; Bagaturia, Y. ; Balagura, V. ; Bargiotti, M. ; Barsukova, O. ; Bastos, J. ; Batista, J. ; Bauer, C. ; Bauer, Th.S. ; Belkov, A. ; Belkov, Ar. ; Belotelov, I. ; Bertin, A. ; Bobchenko, B. ; Bocker, M. ; Bogatyrev, A. ; Bohm, G. ; Brauer, M. ; Bruinsma, M. ; Bruschi, M. ; Buchholz, P. ; Buran, T. ; Carvalho, J. ; Conde, P. ; Cruse, C. ; Dam, M. ; Danielsen, K.M. ; Danilov, M. ; De Castro, S. ; Deppe, H. ; Dong, X. ; Dreis, H.B. ; Egorytchev, V. ; Ehret, K. ; Eisele, F. ; Emeliyanov, D. ; Essenov, S. ; Fabbri, L. ; Faccioli, P. ; Feuerstack-Raible, M. ; Flammer, J. ; Fominykh, B. ; Funcke, M. ; Garrido, Ll. ; Gellrich, A. ; Giacobbe, B. ; Gla, J. ; Goloubkov, D. ; Golubkov, Y. ; Golutvin, A. ; Golutvin, I. ; Gorbounov, I. ; Gorisek, A. ; Gouchtchine, O. ; Goulart, D.C. ; Gradl, S. ; Gradl, W. ; Grimaldi, F. ; Groth-Jensen, J. ; Guilitsky, Yu. ; Hansen, J.D. ; Hernandez, J.M. ; Hofmann, W. ; Hohlmann, M. ; Hott, T. ; Hulsbergen, W. ; Husemann, U. ; Igonkina, O. ; Ispiryan, M. ; Jagla, T. ; Jiang, C. ; Kapitza, H. ; Karabekyan, S. ; Karpenko, N. ; Keller, S. ; Kessler, J. ; Khasanov, F. ; Kiryushin, Yu. ; Kisel, I. ; Klinkby, E. ; Knopfle, K.T. ; Kolanoski, H. ; Korpar, S. ; Krauss, C. ; Kreuzer, P. ; Krizan, P. ; Krucker, D. ; Kupper, S. ; Kvaratskheliia, T. ; Lanyov, A. ; Lau, K. ; Lewendel, B. ; Lohse, T. ; Lomonosov, B. ; Manner, R. ; Mankel, R. ; Masciocciu, S. ; Robmann, P. ; Rostovtseva, I. ; Rybnikov, V. ; Sanchez, F. ; Sbrizzi, A. ; Schmelling, M. ; Schmidt, B. ; Schreiner, A. ; Schroder, H. ; Schwanke, U. ; Schwartz, A.J. ; Schwarz, A.S. ; Schwenninger, B. ; Schwingenheuer, B. ; Sciacca, F. ; Semprini-Cesari, N. ; Shuvalov, S. ; Silva, L. ; Sozuer, L. ; Solunin, S. ; Somov, A. ; Somov, S. ; Spengler, J. ; Spighi, R. ; Spiridonov, A. ; Stanovnik, A. ; Staric, M. ; Stegmann, C. ; Subramania, H.S. ; Symalla, M. ; Tikhomirov, I. ; Titov, Maxim P. ; Tsakov, I. ; Uwer, U. ; van Eldik, C. ; Vassiliev, Yu. ; Villa, M. ; Vitale, A. ; Vukotic, I. ; Wahlberg, H. ; Walenta, A.H. ; Walter, M. ; Wang, J.J. ; Wegener, D. ; Werthenbach, U. ; Wolters, H. ; Wurth, R. ; Wurz, A. ; Zaitsev, Yu. ; Zavertyaev, M. ; Zeuner, T. ; Zhelezov, A. ; Zheng, Z. ; Zimmermann, R. ; Zivko, T. ; Zoccoli, A.

Published in: Eur.Phys.J.
Year: 2007
Vol.: C49
Page No: 545-558
Pages: 20

Abstract: Ratios of the Psi' over the J/psi production cross sections in the dilepton channel for C, Ti and W targets have been measured in 920 GeV proton-nucleus interactions with the HERA-B detector at the HERA storage ring. The Psi' and J/psi states were reconstructed in both the mu+mu- and the e+e- decay modes. The measurements covered the kinematic range -0.35 < x_F < 0.1 with transverse momentum p_T < 4.5 GeV/c. The Psi' to J/psi production ratio is almost constant in the covered x_F range and shows a slow increase with p_T. The angular dependence of the ratio has been used to measure the difference of the Psi' and J/psi polarization. All results for the muon and electron decay channels are in good agreement: their ratio, averaged over all events, is R_psi'(mu)/R_psi'(e)=1.00+-0.08+-0.04. This result constitutes a new, direct experimental constraint on the double ratio of branching fractions, (B'(mu)*B(e))/(B(mu)*B'(e)), of Psi' and J/psi in the two channels.

Web-Page: http://publish.edpsciences.org/abstract/EPJC/V49/P545

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