Lambda Spectra in 11.6 A GeV/c Au- Au Collisions}

Albergo, S.; Bellwied, R.; Bennett, M.; Boemi, D.; Bonner, B.; Caccia, Z.; Caines, H.; Christie, W.; Cin, G.; Costa, Salvatore; Crawford, H.; Cronqvist, M.; Debbe, R.; Engelage, J.; Flores, I.; Greiner, L.; Hallman, T.; Hoffman, G.; Huang, H.; Humanic, T. J.; Igo, G.; Insolia, Antonio; Jensen, P.; Judd, E.; Kainz, K.; Kaplan, M.; Kelly, S.; Kotov, I.; Kunde, G.; Lindstrom, P.; Ljubicic, T.; Llope, W.; Longacre, R.; LO CURTO, G.; Lynn, D.; Madansky, L.; Mahzeh, N.; Milosevich, Z.; Mitchell, J. T.; Mitchell, J.; Nehmeh, S.; Nociforo, C.; Paganis, S.; Pandey, S. U.; Potenza, R.; Platner, E.; Riley, P.; Russ, D.; Saulys, A.; Schambach, J.; Sheen, J.; Stokley, C.; Sugarbaker, E.; Takahashi, J.; Tang, J.; Trentalange, S.; Tricomi, Alessia Rita; Tull, C.; Tuve', Cristina Natalina; Whitfield, J.; Wilson, K.

doi:10.1103/PhysRevLett.88.062301

E896 has measured Lambda production in 11.6A GeV/c Au-Au collisions over virtually the whole rapidity phase space. The midrapidity p(t) distributions have been measured for the first time at this energy and appear to indicate that the Lambda hyperons have different freeze-out conditions than protons. A comparison with the relativistic quantum molecular dynamics model shows that while there is good shape agreement at high rapidity the model predicts significantly different slopes of the m(t) spectra at midrapidity. The data, where overlap occurs, are consistent with previously reported measurements. RI Takahashi, Jun/B-2946-2012