J/ polarization in p+p collisions at s=200 GeV in STAR uri icon

abstract

  • 2014 The Authors. We report on a polarization measurement of inclusive J/ mesons in the di-electron decay channel at mid-rapidity at 2 < pT < 6 GeV/c in p + p collisions at s = 200 GeV. Data were taken with the STAR detector at RHIC. The J/ polarization measurement should help to distinguish between the different models of the J/ production mechanism since they predict different pT dependences of the J/ polarization. In this analysis, J/ polarization is studied in the helicity frame. The polarization parameter measured at RHIC becomes smaller towards high pT , indicating more longitudinal J/ polarization as pT increases. The result is compared with predictions of presently available models.

published proceedings

  • Physics Letters B

altmetric score

  • 0.75

author list (cited authors)

  • Collaboration, S., Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., ... Zyzak, M.

citation count

  • 9

complete list of authors

  • Collaboration, STAR||Adamczyk, L||Adkins, JK||Agakishiev, G||Aggarwal, MM||Ahammed, Z||Alekseev, I||Alford, J||Anson, CD||Aparin, A||Arkhipkin, D||Aschenauer, EC||Averichev, GS||Balewski, J||Banerjee, A||Barnovska, Z||Beavis, DR||Bellwied, R||Bhasin, A||Bhati, AK||Bhattarai, P||Bichsel, H||Bielcik, J||Bielcikova, J||Bland, LC||Bordyuzhin, IG||Borowski, W||Bouchet, J||Brandin, AV||Brovko, SG||Bültmann, S||Bunzarov, I||Burton, TP||Butterworth, J||Caines, H||de la Barca Sánchez, M Calderón||Cebra, D||Cendejas, R||Cervantes, MC||Chaloupka, P||Chang, Z||Chattopadhyay, S||Chen, HF||Chen, JH||Chen, L||Cheng, J||Cherney, M||Chikanian, A||Christie, W||Chwastowski, J||Codrington, MJM||Corliss, R||Cramer, JG||Crawford, HJ||Cui, X||Das, S||Leyva, A Davila||De Silva, LC||Debbe, RR||Dedovich, TG||Deng, J||Derevschikov, AA||de Souza, R Derradi||Dhamija, S||di Ruzza, B||Didenko, L||Dilks, C||Ding, F||Djawotho, P||Dong, X||Drachenberg, JL||Draper, JE||Du, CM||Dunkelberger, LE||Dunlop, JC||Efimov, LG||Engelage, J||Engle, KS

publication date

  • December 2014