Results on open charm from NA50

The NA50 and NA38 experiments have studied muon pair production in p- A and nucleus-nucleus collisions at the CERN SPS. Results on dimuons in the invariant mass region between the $\phi$ and the J/$\psi$ masses (IMR) are presented. The standard sources of muon pairs in the IMR are the Drell-Yan proc...

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Detalles Bibliográficos
Autores principales: Masera, M, Abreu, M C, Alessandro, B, Alexa, C, Arnaldi, R, Ataian, M R, Baglin, C, Baldit, A, Bedjidian, Marc, Beolè, S, Boldea, V, Bordalo, P, Bussière, A, Capelli, L, Casagrande, L, Castor, J I, Chambon, T, Chaurand, B, Chevrot, I, Cheynis, B, Chiavassa, E, Cicalò, C, Claudino, T, Comets, M P, Constans, N, Constantinescu, S, De Falco, A, De Marco, N, Dellacasa, G, Devaux, A, Dita, S, Drapier, O, Ducroux, L, Espagnon, B, Fargeix, J, Force, P, Gallio, M, Gavrilov, Yu K, Gerschel, C, Giubellino, P, Golubeva, M B, Gonin, M, Grigorian, A A, Grossiord, J Y, Guber, F F, Guichard, A, Gulkanian, H R, Hakobyan, R S, Haroutunian, R, Idzik, M, Jouan, D, Karavitcheva, T L, Kluberg, L, Kurepin, A B, Le Bornec, Y, Lourenço, C, Macciotta, P, MacCormick, M, Marzari-Chiesa, A, Masoni, A, Mehrabyan, S S, Monteno, M, Musso, A, Petiau, P, Piccotti, A, Pizzi, J R, Prino, F, Puddu, G, Quintans, C, Ramos, S, Ramello, L, Rato-Mendes, P, Riccati, L, Romana, A, Ropotar, I, Saturnini, P, Scomparin, E, Serci, S, Shahoyan, R, Silva, S, Sitta, M, Soave, C, Sonderegger, P, Tarrago, X, Topilskaya, N S, Usai, G L, Vercellin, Ermanno, Villatte, L, Willis, N
Lenguaje:eng
Publicado: 2001
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1088/0954-3899/27/3/353
http://cds.cern.ch/record/513312
Descripción
Sumario:The NA50 and NA38 experiments have studied muon pair production in p- A and nucleus-nucleus collisions at the CERN SPS. Results on dimuons in the invariant mass region between the $\phi$ and the J/$\psi$ masses (IMR) are presented. The standard sources of muon pairs in the IMR are the Drell-Yan process and the semileptonic decay of charmed mesons. A new four-dimensional unfolding method is applied to the data. The p-A results are well described in terms of these known sources, which, in contrast, fail to explain nucleus-nucleus data: an extra yield of muon pairs is observed. Although this excess is compatible with an enhanced production of charmed hadrons, other possible sources cannot be excluded. In particular, a comparison between data and predictions from a theoretical model which calculates the production of thermal dimuons is presented in this paper. (13 refs).

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