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

Publication ,  Journal Article
Adamczyk, L; Adkins, JK; Agakishiev, G; Aggarwal, MM; Ahammed, Z; Alekseev, I; Alford, J; Anson, CD; Aparin, A; Arkhipkin, D; Aschenauer, EC ...
Published in: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
December 2, 2014

We report on a polarization measurement of inclusive J/ψ 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/ψ polarization measurement should help to distinguish between the different models of the J/ψ production mechanism since they predict different pT dependences of the J/ψ polarization. In this analysis, J/ψ polarization is studied in the helicity frame. The polarization parameter λθ measured at RHIC becomes smaller towards high pT , indicating more longitudinal J/ψ polarization as pT increases. The result is compared with predictions of presently available models.

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Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

December 2, 2014

Volume

739

Start / End Page

180 / 188

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Adamczyk, L., Adkins, J. K., Agakishiev, G., Aggarwal, M. M., Ahammed, Z., Alekseev, I., … Haag, B. (2014). J/ψ polarization in p+p collisions at s=200 GeV in STAR. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 739, 180–188. https://doi.org/10.1016/j.physletb.2014.10.049
Adamczyk, L., J. K. Adkins, G. Agakishiev, M. M. Aggarwal, Z. Ahammed, I. Alekseev, J. Alford, et al. “J/ψ polarization in p+p collisions at s=200 GeV in STAR.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 739 (December 2, 2014): 180–88. https://doi.org/10.1016/j.physletb.2014.10.049.
Adamczyk L, Adkins JK, Agakishiev G, Aggarwal MM, Ahammed Z, Alekseev I, et al. J/ψ polarization in p+p collisions at s=200 GeV in STAR. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2014 Dec 2;739:180–8.
Adamczyk, L., et al. “J/ψ polarization in p+p collisions at s=200 GeV in STAR.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 739, Dec. 2014, pp. 180–88. Scopus, doi:10.1016/j.physletb.2014.10.049.
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, Calderón De La Barca Sánchez M, 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, Davila Leyva A, De Silva LC, Debbe RR, Dedovich TG, Deng J, Derevschikov AA, Derradi De Souza R, 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, Eppley G, Eun L, Evdokimov O, Fatemi R, Fazio S, Fedorisin J, Filip P, Finch E, Fisyak Y, Flores CE, Gagliardi CA, Gangadharan DR, Garand D, Geurts F, Gibson A, Girard M, Gliske S, Grosnick D, Guo Y, Gupta A, Gupta S, Guryn W, Haag B. J/ψ polarization in p+p collisions at s=200 GeV in STAR. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2014 Dec 2;739:180–188.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

December 2, 2014

Volume

739

Start / End Page

180 / 188

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics