J/Ѱ polarization in p+p collisions at √s = 200 GeV in STAR

Authors

L. Adamczyk
J. K. Adkins
G. Agakishiev
M. M. Aggarwal
Z. Ahammed
I. Alekseev
J. Alford
C. D. Anson
A. Aparin
D. Arkhipkin
S. Bültmann, Old Dominion UniversityFollow

Document Type

Article

Publication Date

2014

DOI

10.1016/j.physletb.2014.10.049

Publication Title

Physics Letters B.

Pages

180-188

Abstract

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

Comments

This is an open access article under the CC BY license.

(https://creativecommons.org/licenses/by/3.0/)

Original Publication Citation

Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., . . . Zyzak, M. (2014). J/Ѱ polarization in p plus p collisions at √s=200 GeV in STAR. Physics Letters B, 739, 180-188. doi: 10.1016/j.physletb.2014.10.049

Repository Citation

Adamczyk, L.; Adkins, J. K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Alekseev, I.; Alford, J.; Anson, C. D.; Aparin, A.; Arkhipkin, D.; and Bültmann, S., "J/Ѱ polarization in p+p collisions at √s = 200 GeV in STAR" (2014). Physics Faculty Publications. 55.
https://digitalcommons.odu.edu/physics_fac_pubs/55