/ Experiment-HEP arXiv:0807.2167


Production of the Charmonium States chi(c1) and chi(c2) in Proton Nucleus Interactions at s**(1/2) = 41.6-GeV


Abt, I. (Munich, Max Planck Inst.) ; Adams, M. (Dortmund U.) ; Agari, M. (Heidelberg, Max Planck Inst.) ; Albrecht, H. (DESY) ; Aleksandrov, A. (DESY, Zeuthen) ; Amaral, V. (LIP, Coimbra) ; Amorim, A. (LIP, Coimbra) ; Aplin, S.J. (DESY) ; Aushev, V. (Kiev, INR) ; Bagaturia, Y. (Tbilisi State U.) ; Balagura, V. (Moscow, ITEP) ; Bargiotti, M. (INFN, Bologna) ; Barsukova, O. (Dubna, JINR) ; Bastos, J. (LIP, Coimbra) ; Batista, J. (LIP, Coimbra) ; Bauer, C. (Heidelberg, Max Planck Inst.) ; Bauer, Th.S. (NIKHEF, Amsterdam) ; Belkov, A. (Dubna, JINR) ; Belkov, Ar. (Dubna, JINR) ; Belotelov, I. (Dubna, JINR) ; Bertin, A. (INFN, Bologna) ; Bobchenko, B. (Moscow, ITEP) ; Bocker, M. (Siegen U.) ; Bogatyrev, A. (Moscow, ITEP) ; Bohm, G. (DESY, Zeuthen) ; Brauer, M. (Heidelberg, Max Planck Inst.) ; Bruinsma, M. (NIKHEF, Amsterdam) ; Bruschi, M. (INFN, Bologna) ; Buchholz, P. (Siegen U.) ; Buran, T. (Oslo U.) ; Carvalho, J. (LIP, Coimbra) ; Conde, P. (DESY) ; Cruse, C. (Dortmund U.) ; Dam, M. (Bohr Inst.) ; Danielsen, K.M. (Oslo U.) ; Danilov, M. (Moscow, ITEP) ; De Castro, S. (INFN, Bologna) ; Deppe, H. (Heidelberg U.) ; Dong, X. (Beijing, Inst. High Energy Phys.) ; Dreis, H.B. (Heidelberg U.) ; Egorytchev, V. (DESY) ; Ehret, K. (Dortmund U.) ; Eisele, F. (Heidelberg U.) ; Emeliyanov, D. (DESY) ; Essenov, S. (Moscow, ITEP) ; Fabbri, L. (INFN, Bologna) ; Faccioli, P. (INFN, Bologna) ; Feuerstack-Raible, M. (Heidelberg U.) ; Flammer, J. (DESY) ; Fominykh, B. (Moscow, ITEP) ; Funcke, M. (Dortmund U.) ; Garrido, Ll. (Barcelona U., ECM) ; Gellrich, A. (DESY, Zeuthen) ; Giacobbe, B. (INFN, Bologna) ; Glass, J. (Mannheim U.) ; Goloubkov, D. (Moscow Phys. Eng. Inst.) ; Golubkov, Y. (Moscow State U.) ; Golutvin, A. (Moscow, ITEP) ; Golutvin, I. (Dubna, JINR) ; Gorbounov, I. (Siegen U.) ; Gorisek, A. (Stefan Inst., Ljubljana) ; Gouchtchine, O. (Moscow, ITEP) ; Goulart, D.C. (Cincinnati U.) ; Gradl, S. (Heidelberg U.) ; Gradl, W. (Heidelberg U.) ; Grimaldi, F. (INFN, Bologna) ; Groth-Jensen, J. (Bohr Inst.) ; Guilitsky, Yu. (Serpukhov, IHEP) ; Hansen, J.D. (Bohr Inst.) ; Hernandez, J.M. (DESY, Zeuthen) ; Hofmann, W. (Heidelberg, Max Planck Inst.) ; Hohlmann, M. (DESY) ; Hott, T. (Heidelberg U.) ; Hulsbergen, W. (NIKHEF, Amsterdam) ; Husemann, U. (Siegen U.) ; Igonkina, O. (Moscow, ITEP) ; Ispiryan, M. (Houston U.) ; Jagla, T. (Heidelberg, Max Planck Inst.) ; Jiang, C. (Beijing, Inst. High Energy Phys.) ; Kapitza, H. (DESY) ; Karabekyan, S. (Rostock U.) ; Karpenko, N. (Dubna, JINR) ; Keller, S. (Siegen U.) ; Kessler, J. (Heidelberg U.) ; Khasanov, F. (Moscow, ITEP) ; Kiryushin, Yu. (Dubna, JINR) ; Kisel, I. (Munich, Max Planck Inst.) ; Klinkby, E. (Bohr Inst.) ; Knopfle, K.T. (Heidelberg, Max Planck Inst.) ; Kolanoski, H. (Humboldt U., Berlin) ; Korpar, S. (Stefan Inst., Ljubljana) ; Krauss, C. (Heidelberg U.) ; Kreuzer, P. (UCLA) ; Krizan, P. (Stefan Inst., Ljubljana) ; Krucker, D. (Humboldt U., Berlin) ; Kupper, S. (Stefan Inst., Ljubljana) ; Kvaratskheliia, T. (Moscow, ITEP) ; Lanyov, A. (Dubna, JINR) ; Lau, K. (Houston U.) ; Lewendel, B. (DESY) ; Lohse, T. (Humboldt U., Berlin) ; Lomonosov, B. (Lebedev Inst.) ; Manner, R. (Mannheim U.) ; Mankel, R. (DESY, Zeuthen) ; Masciocchi, S. (DESY) ; Massa, I. (INFN, Bologna) ; Matchikhilian, I. (Moscow, ITEP) ; Medin, G. (Humboldt U., Berlin) ; Medinnis, M. (DESY) ; Mevius, M. (DESY) ; Michetti, A. (DESY) ; Mikhailov, Yu. (Serpukhov, IHEP) ; Mizuk, R. (Moscow, ITEP) ; Muresan, R. (Bohr Inst.) ; zur Nedden, M. (Humboldt U., Berlin) ; Negodaev, M. (Lebedev Inst.) ; Norenberg, M. (DESY) ; Nowak, S. (DESY, Zeuthen) ; Nunez Pardo de Vera, M.T. (DESY) ; Ouchrif, M. (NIKHEF, Amsterdam) ; Ould-Saada, F. (Oslo U.) ; Padilla, C. (DESY) ; Peralta, D. (Barcelona U., ECM) ; Pernack, R. (Rostock U.) ; Pestotnik, R. (Stefan Inst., Ljubljana) ; Petersen, B.AA. (Bohr Inst.) ; Piccinini, M. (INFN, Bologna) ; Pleier, Marc-Andre (Heidelberg, Max Planck Inst.) ; Poli, M. (Florence U., Dip. di Energetica) ; Popov, V. (Moscow, ITEP) ; Pose, D. (Heidelberg U.) ; Prystupa, S. (Kiev, INR) ; Pugatch, V. (Kiev, INR) ; Pylypchenko, Y. (Oslo U.) ; Pyrlik, J. (Houston U.) ; Reeves, K. (Heidelberg, Max Planck Inst.) ; Ressing, D. (DESY) ; Rick, H. (Heidelberg U.) ; Riu, I. (DESY) ; Robmann, P. (Zurich U.) ; Rostovtseva, I. (Moscow, ITEP) ; Rybnikov, V. (DESY) ; Sanchez, F. (Heidelberg, Max Planck Inst.) ; Sbrizzi, A. (NIKHEF, Amsterdam) ; Schmelling, M. (Heidelberg, Max Planck Inst.) ; Schmidt, B. (DESY) ; Schreiner, A. (DESY, Zeuthen) ; Schroder, H. (Rostock U.) ; Schwanke, U. (DESY, Zeuthen) ; Schwartz, A.J. (Cincinnati U.) ; Schwarz, A.S. (DESY) ; Schwenninger, B. (Dortmund U.) ; Schwingenheuer, B. (Heidelberg, Max Planck Inst.) ; Sciacca, F. (Heidelberg, Max Planck Inst.) ; Semprini-Cesari, N. (INFN, Bologna) ; Shuvalov, S. (Humboldt U., Berlin) ; Silva, L. (LIP, Coimbra) ; Sozuer, L. (DESY) ; Solunin, S. (Dubna, JINR) ; Somov, A. (DESY) ; Somov, S. (Moscow Phys. Eng. Inst.) ; Spengler, J. (DESY) ; Spighi, R. (INFN, Bologna) ; Spiridonov, A. (Moscow, ITEP) ; Stanovnik, A. (Stefan Inst., Ljubljana) ; Staric, M. (Stefan Inst., Ljubljana) ; Stegmann, C. (Humboldt U., Berlin) ; Subramania, H.S. (Houston U.) ; Symalla, M. (Dortmund U.) ; Tikhomirov, I. (Moscow, ITEP) ; Titov, Maxim P. (Moscow, ITEP) ; Tsakov, I. (Sofiya, Inst. Nucl. Res.) ; Uwer, U. (Heidelberg U.) ; van Eldik, C. (Dortmund U.) ; Vassiliev, Yu. (Kiev, INR) ; Villa, M. (INFN, Bologna) ; Vitale, A. (Fond. Giuseppe Occhialini) ; Vukotic, I. (DESY, Zeuthen) ; Wahlberg, H. (Utrecht U.) ; Walenta, A.H. (Siegen U.) ; Walter, M. (DESY, Zeuthen) ; Wang, J.J. (Tsinghua U., Beijing) ; Wegener, D. (Dortmund U.) ; Werthenbach, U. (Siegen U.) ; Wolters, H. (LIP, Coimbra) ; Wurth, R. (DESY) ; Wurz, A. (Mannheim U.) ; Xella-Hansen, S. (Bohr Inst.) ; Zaitsev, Yu. (Moscow, ITEP) ; Zavertyaev, M. (Lebedev Inst.) ; Zeuner, T. (Siegen U.) ; Zhelezov, A. (Moscow, ITEP) ; Zheng, Z. (Beijing, Inst. High Energy Phys.) ; Zimmermann, R. (Rostock U.) ; Zivko, T. (Stefan Inst., Ljubljana) ; Zoccoli, A. (INFN, Bologna)

Published in: Phys.Rev.
Year: 2009
Vol.: D79
Page No: 012001
Pages: 19

Abstract: A measurement of the ratio R_chic = (chic -> Jpsi + gam)/ Jpsi in pC, pTi and pW interactions at 920 GeV/c (sqrt{s}=41.6 GeV) in the Feynman-x range -0.35 < x_F(Jpsi) < 0.15 is presented. Both mu+mu- and e+e- Jpsi decay channels are observed with an overall statistics of about 15000 chic events, which is by far the largest available sample in pA collisions. The result is R_chic = 0.188+-0.013(st)(+0.024)(-0.022)(sys) averaged over the different materials, when no Jpsi and chic polarisations are considered. The chic_1 to chic_2 production ratio R_12 = R_chic1/R_chic2 is measured to be 1.02+-0.40, leading to a cross section ratio sigma(chic_1)/sigma(chic_2)=0.57+-0.23. The dependence of R_chic on the Feynman-x of the Jpsi, x_F(Jpsi), and its transverse momentum, p_T(Jpsi), is studied, as well as its dependence on the atomic number, A, of the target. For the first time, an extensive study of possible biases on R_chic and R_12 due to the dependence of acceptance on the polarization states of Jpsi and chic is performed. By varying the polarisation parameter, lambda(obs), of all produced Jpsi's by two sigma around the value measured by HERA-B, and considering the maximum variation due to the possible chic_1 and chic_2 polarisations, it is shown that R_chic could change by a factor between 1.02 and 1.21 and R_12 by a factor between 0.89 and 1.16.

Total numbers of views: 1725
Numbers of unique views: 763
e-proceeding
 Record created 2010-10-29, last modified 2014-01-30



Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)