Associated charm production in neutrino-nucleus interactions

Kayis Topaksu, A.; Onengut, G.; Dantzig, R. v.; Jong, M. d.; R. G. C.,; Guler, M.; Kose, U.; Tolun, P.; Catanesi, M. G.; Muciaccia, M. T.; Winter, K.; B. v., De; Vilain, P.; Wilquet, G.; Saitta, B.; Capua, E. D.; Ogawa, S.; Shibuya, H.; Hristova, I. R.; Kawamura, T.; Kolev, D.; Meinhard, H.; Panman, J.; Rozanov, A.; Tsenov, R.; 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.; Gregoire, 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, Giovanni; DE ROSA, Gianfranca; Capua, F. D.; Fiorillo, Giuliana; Marotta, A.; Migliozzi, P.; Lavina, L. S.; 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 nu-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 nu. 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. interactions, sigma(c (c) over barv)/sigma(DIS)(NC) = (3.62(-2.42)(+2.95)(stat)+/-0.54(sysyt))x10(-3) has been measured. One event with two charm decays has been observed in charged-current nu(mu) interactions with an estimated background of 0.18 +/- 0.06 and the upper limit on associated charm in charged- current interactions at 90% C. L. has been found to be sigma(c (c) over bar mu(-))/sigma(CC) < 9.69 x 10(-4).

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