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

STAR Collaboration

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)180-188
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume739
DOIs
StatePublished - Dec 2 2014

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collisions
polarization
mesons
detectors
decay
predictions
electrons

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

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

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 739, 02.12.2014, p. 180-188.

Research output: Contribution to journalArticle

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title = "J/ψ polarization in p+p collisions at s=200 GeV in STAR",
abstract = "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.",
author = "{STAR Collaboration} and L. Adamczyk and Adkins, {J. K.} and G. Agakishiev and Aggarwal, {M. M.} and Z. Ahammed and I. Alekseev and J. Alford and Anson, {C. D.} and A. Aparin and D. Arkhipkin and Aschenauer, {E. C.} and Averichev, {G. S.} and J. Balewski and A. Banerjee and Z. Barnovska and Beavis, {D. R.} and R. Bellwied and A. Bhasin and Bhati, {A. K.} and P. Bhattarai and H. Bichsel and J. Bielcik and J. Bielcikova and Bland, {L. C.} and Bordyuzhin, {I. G.} and W. Borowski and J. Bouchet and Brandin, {A. V.} and Brovko, {S. G.} and S. B{\"u}ltmann and I. Bunzarov and Burton, {T. P.} and J. Butterworth and H. Caines and {Calder{\'o}n De La Barca S{\'a}nchez}, M. and D. Cebra and R. Cendejas and Cervantes, {M. C.} and P. Chaloupka and Z. Chang and S. Chattopadhyay and Chen, {H. F.} and Chen, {J. H.} and L. Chen and J. Cheng and Cherney, {Michael G.} and A. Chikanian and W. Christie and J. Chwastowski and Seger, {Janet E.}",
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TY - JOUR

T1 - J/ψ polarization in p+p collisions at s=200 GeV in STAR

AU - STAR Collaboration

AU - Adamczyk, L.

AU - Adkins, J. K.

AU - Agakishiev, G.

AU - Aggarwal, M. M.

AU - Ahammed, Z.

AU - Alekseev, I.

AU - Alford, J.

AU - Anson, C. D.

AU - Aparin, A.

AU - Arkhipkin, D.

AU - Aschenauer, E. C.

AU - Averichev, G. S.

AU - Balewski, J.

AU - Banerjee, A.

AU - Barnovska, Z.

AU - Beavis, D. R.

AU - Bellwied, R.

AU - Bhasin, A.

AU - Bhati, A. K.

AU - Bhattarai, P.

AU - Bichsel, H.

AU - Bielcik, J.

AU - Bielcikova, J.

AU - Bland, L. C.

AU - Bordyuzhin, I. G.

AU - Borowski, W.

AU - Bouchet, J.

AU - Brandin, A. V.

AU - Brovko, S. G.

AU - Bültmann, S.

AU - Bunzarov, I.

AU - Burton, T. P.

AU - Butterworth, J.

AU - Caines, H.

AU - Calderón De La Barca Sánchez, M.

AU - Cebra, D.

AU - Cendejas, R.

AU - Cervantes, M. C.

AU - Chaloupka, P.

AU - Chang, Z.

AU - Chattopadhyay, S.

AU - Chen, H. F.

AU - Chen, J. H.

AU - Chen, L.

AU - Cheng, J.

AU - Cherney, Michael G.

AU - Chikanian, A.

AU - Christie, W.

AU - Chwastowski, J.

AU - Seger, Janet E.

PY - 2014/12/2

Y1 - 2014/12/2

N2 - 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.

AB - 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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U2 - 10.1016/j.physletb.2014.10.049

DO - 10.1016/j.physletb.2014.10.049

M3 - Article

VL - 739

SP - 180

EP - 188

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

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

SN - 0370-2693

ER -