Double-helicity dependence of jet properties from dihadrons in longitudinally polarized p+p collisions at {radical}(s)=200 GeV

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.012002· OSTI ID:21408940

Adare, A; Bickley, A A; Ellinghaus, F; Glenn, A; Kinney, E; Kiriluk, K; Nagle, J L; Seele, J; Wysocki, M ^[1]; Afanasiev, S; Isupov, A; Litvinenko, A; Malakhov, A; Peresedov, V; Rukoyatkin, P; Zolin, L ^[2]; Aidala, C ^[3]; Ajitanand, N N; Alexander, J; Chung, P ^[4]

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1. University of Colorado, Boulder, Colorado 80309 (United States)
2. Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region (Russian Federation)
3. Columbia University, New York, New York 10027 (United States) and Nevis Laboratories, Irvington, New York 10533 (United States)
4. Chemistry Department, Stony Brook University, SUNY, Stony Brook, New York 11794-3400 (United States)

It has been postulated that partonic orbital angular momentum can lead to a significant double-helicity dependence in the net transverse momentum of Drell-Yan dileptons produced in longitudinally polarized p+p collisions. Analogous effects are also expected for dijet production. If confirmed by experiment, this hypothesis, which is based on semiclassical arguments, could lead to a new approach for studying the contributions of orbital angular momentum to the proton spin. We report the first measurement of the double-helicity dependence of the dijet transverse momentum in longitudinally polarized p+p collisions at {radical}(s)=200 GeV from data taken by the PHENIX experiment in 2005 and 2006. The analysis deduces the transverse momentum of the dijet from the widths of the near- and far-side peaks in the azimuthal correlation of the dihadrons. When averaged over the transverse momentum of the triggered particle, the difference of the root mean square of the dijet transverse momentum between like- and unlike-helicity collisions is found to be -37{+-}88{sup stat{+-}}14{sup syst} MeV/c.

• OSTI ID: 21408940
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 1; Other Information: DOI: 10.1103/PhysRevD.81.012002; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLLISIONS
CORRELATIONS
DRELL MODEL
GEV RANGE 100-1000
HELICITY
HYPOTHESIS
ORBITAL ANGULAR MOMENTUM
PARTICLE PRODUCTION
PROTON-PROTON INTERACTIONS
PROTONS
SEMICLASSICAL APPROXIMATION
SPIN
TRANSVERSE MOMENTUM
ANGULAR MOMENTUM
APPROXIMATIONS
BARYON-BARYON INTERACTIONS
BARYONS
CALCULATION METHODS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
HADRON-HADRON INTERACTIONS
HADRONS
INTERACTIONS
LINEAR MOMENTUM
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE PROPERTIES
PROTON-NUCLEON INTERACTIONS