Measurement of the Polarization of the {upsilon}(1S) and {upsilon}(2S) States in pp Collisions at {radical}(s)=1.96 TeV

Journal Article · Fri Oct 31 00:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.182004· OSTI ID:21179865

Abazov, V M; Alexeev, G D; Kharzheev, Y M; Malyshev, V L; Tokmenin, V V; Vertogradov, L S; Yatsunenko, Y A ^[1]; Abbott, B; Gutierrez, P; Hossain, S; Jain, S; Rominsky, M; Severini, H; Skubic, P; Strauss, M ^[2]; Abolins, M; Benitez, J A; Brock, R; Dyer, J; Edmunds, D ^[3]

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1. Joint Institute for Nuclear Research, Dubna (Russian Federation)
2. University of Oklahoma, Norman, Oklahoma 73019 (United States)
3. Michigan State University, East Lansing, Michigan 48824 (United States)

We present a study of the polarization of the {upsilon}(1S) and {upsilon}(2S) states using a 1.3 fb{sup -1} data sample collected by the D0 experiment in 2002-2006 during run II of the Fermilab Tevatron Collider. We measure the polarization parameter {alpha}=({sigma}{sub T}-2{sigma}{sub L})/({sigma}{sub T}+2{sigma}{sub L}), where {sigma}{sub T} and {sigma}{sub L} are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum (p{sub T}{sup {upsilon}}) for the {upsilon}(1S) and {upsilon}(2S). Significant p{sub T}{sup {upsilon}}-dependent longitudinal polarization is observed for the {upsilon}(1S). A comparison with theoretical models is presented.

• OSTI ID: 21179865
• Journal Information: Physical Review Letters, Vol. 101, Issue 18; Other Information: DOI: 10.1103/PhysRevLett.101.182004; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CROSS SECTIONS
FERMILAB TEVATRON
POLARIZATION
PROTON-PROTON INTERACTIONS
TEV RANGE 01-10
TRANSVERSE MOMENTUM