Transverse Momentum Dependence of J/psi Polarization at Midrapidity in p+p Collisions at s = 200 GeV

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.82.012001· OSTI ID:984380

Adare, A. ^[1]; Awes, Terry C ^[2]; Cianciolo, Vince ^[2]; Efremenko, Yuri ^[3]; Enokizono, Akitomo ^[4]; Read, Jr, Kenneth F ^[2]; Silvermyr, David O ^[2]; Sorensen, Soren P ^[5]; Stankus, Paul W ^[2]

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1. University of Colorado, Boulder
2. ORNL
3. University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
4. Oak Ridge National Laboratory (ORNL)
5. University of Tennessee, Knoxville (UTK)

We report the measurement of the transverse momentum dependence of inclusive J/{psi} polarization in p+p collisions at {radical}s = 200 GeV performed by the PHENIX Experiment at the Relativistic Heavy Ion Collider. The J/{psi} polarization is studied in the helicity, Gottfried-Jackson, and Collins-Soper frames for p{sub T} < 5 GeV/c and |y| < 0.35. The polarization in the helicity and Gottfried-Jackson frames is consistent with zero for all transverse momenta, with a slight (1.8 sigma) trend towards longitudinal polarization for transverse momenta above 2 GeV/c. No conclusion is allowed due to the limited acceptance in the Collins-Soper frame and the uncertainties of the current data. The results are compared to observations for other collision systems and center of mass energies and to different quarkonia production models.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 984380
• Journal Information: Physical Review D, Vol. 82, Issue 1; ISSN 1550-7998
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
HEAVY IONS
HELICITY
POLARIZATION
PRODUCTION
TRANSVERSE MOMENTUM