Measurement of the polarization of the Upsilon(1S) and Upsilon(2S) states in p anti-p collisions at s**(1/2) = 1.96 TeV

0322412 - FZÚ 2009 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Abolins, M. - Kupčo, Alexander - Lokajíček, Miloš
Measurement of the polarization of the Upsilon(1S) and Upsilon(2S) states in p anti-p collisions at s**(1/2) = 1.96 TeV.
[Měření polarizace ypsilon (1S) a ypsilon (2S) stavů u p anti-p srážek při s** (1 / 2) = 1.96 TeV.]
Physical Review Letters. Roč. 101, č. 18 (2008), 182004/1-182004/7. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LA08047; GA MŠMT 1P05LA257; GA MŠMT LC527
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 * Tevatron * meson * polarization
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 7.180, year: 2008

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

Předkládáme studii o polarizaci stavů (1S) a (2S) za použití 1,3 fb-1 vzorek dat shromážděných v D0 experimentu v období 2002-2006 během II běhu na Fermilabském urychlovači Tevatron. Měření polarizačního parametru = (T-2L) / (T +2 L), kde T a L jsou příčně i podélně polarizované částí
Permanent Link: http://hdl.handle.net/11104/0170672