Associated charm production in neutrino–nucleus interactions

Kayis Topaksu, A.; Önengüt, G.; van Dantzig, R.; de Jong, M.; Oldeman, R. G. C.; Güler, M.; Köse, U.; Tolun, P.; Catanesi, M. G.; Muciaccia, M. T.; Winter, K.; Van de Vyver, B.; Vilain, P.; Wilquet, G.; Saitta, B.; Di Capua, E.; Ogawa, S.; Shibuya, H.; Hristova, I. R.; Kawamura, T.; Kolev, D.; Meinhard, H.; Panman, J.; Rozanov, A.; Tsenov, R.; Uiterwijk, J. W. E.; Zucchelli, P.; Goldberg, J.; Chikawa, M.; Song, J. S.; Yoon, C. S.; Kodama, K.; Ushida, N.; Aoki, S.; Hara, T.; Delbar, T.; Favart, D.; Grégoire, G.; Kalinin, S.; Makhlioueva, I.; Artamonov, A.; Gorbunov, P.; Khovansky, V.; Shamanov, V.; Tsukerman, I.; Bruski, N.; Frekers, D.; Hoshino, K.; Kawada, J.; Komatsu, M.; Miyanishi, M.; Nakamura, M.; Nakano, T.; Narita, K.; Niu, K.; Niwa, K.; Nonaka, N.; Sato, O.; Toshito, T.; Buontempo, S.; Cocco, A. G.; D’Ambrosio, N.; De Lellis, G.; De Rosa, G.; DI CAPUA, Francesco; Fiorillo, Giuliana; Marotta, A.; Migliozzi, P.; Scotto Lavina, L.; Strolin, P.; Tioukov, V.; Okusawa, T.; Dore, U.; Loverre, P. F.; Ludovici, L.; Rosa, G.; Santacesaria, R.; Satta, A.; Spada, F. R.; Barbuto, E.; Bozza, C.; Grella, G.; Romano, G.; Sirignano, C.; Sorrentino, S.; Sato, Y.; Tezuka, I.

doi:10.1140/epjc/s10052-007-0410-8

In this paper a search for associated charm production both in neutral and charged current ν-nucleus interactions is presented. The improvement of automatic scanning systems in the CHORUS experiment allows an efficient search to be performed in emulsion for short-lived particles. Hence a search for rare processes, like the associated charm production, becomes possible through the observation of the double charm-decay topology with a very low background. About 130000 ν interactions located in the emulsion target have been analysed. Three events with two charm decays have been observed in the neutral-current sample with an estimated background of 0.18±0.05. The relative rate of the associated charm cross-section in deep inelastic ν interactions, σ(cc ν)/σNC DIS=(3.62+2.95 -2.42(stat)±0.54(syst))×10-3 has been measured. One event with two charm decays has been observed in charged-current νμ interactions with an estimated background of 0.18±0.06 and the upper limit on associated charm production in charged-current interactions at 90% C.L. has been found to be σ(cc μ-)/σCC<9.69×10-4.

Associated charm production in neutrino–nucleus interactions / Kayis Topaksu, A.; Önengüt, G.; van Dantzig, R.; de Jong, M.; Oldeman, R. G. C.; Güler, M.; Köse, U.; Tolun, P.; Catanesi, M. G.; Muciaccia, M. T.; Winter, K.; Van de Vyver, B.; Vilain, P.; Wilquet, G.; Saitta, B.; Di Capua, E.; Ogawa, S.; Shibuya, H.; Hristova, I. R.; Kawamura, T.; Kolev, D.; Meinhard, H.; Panman, J.; Rozanov, A.; Tsenov, R.; Uiterwijk, J. W. E.; Zucchelli, P.; Goldberg, J.; Chikawa, M.; Song, J. S.; Yoon, C. S.; Kodama, K.; Ushida, N.; Aoki, S.; Hara, T.; Delbar, T.; Favart, D.; Grégoire, G.; Kalinin, S.; Makhlioueva, I.; Artamonov, A.; Gorbunov, P.; Khovansky, V.; Shamanov, V.; Tsukerman, I.; Bruski, N.; Frekers, D.; Hoshino, K.; Kawada, J.; Komatsu, M.; Miyanishi, M.; Nakamura, M.; Nakano, T.; Narita, K.; Niu, K.; Niwa, K.; Nonaka, N.; Sato, O.; Toshito, T.; Buontempo, S.; Cocco, A. G.; D’Ambrosio, N.; De Lellis, G.; De Rosa, G.; DI CAPUA, Francesco; Fiorillo, Giuliana; Marotta, A.; Migliozzi, P.; Scotto Lavina, L.; Strolin, P.; Tioukov, V.; Okusawa, T.; Dore, U.; Loverre, P. F.; Ludovici, L.; Rosa, G.; Santacesaria, R.; Satta, A.; Spada, F. R.; Barbuto, E.; Bozza, C.; Grella, G.; Romano, G.; Sirignano, C.; Sorrentino, S.; Sato, Y.; Tezuka, I.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 52:3(2007), pp. 543-552. [10.1140/epjc/s10052-007-0410-8]