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http://acervodigital.unesp.br/handle/11449/24486- Title:
- Measurement of the Polarization of the Upsilon(1S) and Upsilon(2S) States in pp Collisions at s=1.96 TeV
- Abazov, V. M.
- Abbott, B.
- Abolins, M.
- Acharya, B. S.
- Adams, M.
- Adams, T.
- Aguilo, E.
- Ahn, S. H.
- Ahsan, M.
- Alexeev, G. D.
- Alkhazov, G.
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- Muanza, G. S.
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- Novaes, Sérgio Ferraz
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- Bezzubov, V. A.
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- Gruenewald, M. W.
- Moore, R. W.
- Joint Inst Nucl Res
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- Institut national de physique nucléaire et de physique des particules (IN2P3/CNRS)
- Rosatom State Atomic Energy Corporation (ROSATOM)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
- Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
- Fundação para o Desenvolvimento da UNESP (FUNDUNESP)
- Department of Science and Technology (DST) - India
- Colciencias (Colombia)
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- Korea Science and Engineering Foundation (KOSEF)
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- Natural Sciences and Engineering Research Council of Canada (NSERC)
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- Deutsche Forschungsgemeinschaft (DFG)
- Science Foundation Ireland (SFI)
- Swedish Research Council
- CAS
- CNSF (China)
- Alexander von Humboldt Foundation
- We present a study of the polarization of the Upsilon(1S) and Upsilon(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 alpha=(sigma(T)-2 sigma(L))/(sigma(T)+2 sigma(L)), where sigma(T) and sigma(L) are the transversely and longitudinally polarized components of the production cross section, as a function of the transverse momentum (p(T)(Upsilon)) for the Upsilon(1S) and Upsilon(2S). Significant p(T)(Upsilon)-dependent longitudinal polarization is observed for the Upsilon(1S). A comparison with theoretical models is presented.
- 31-Oct-2008
- Physical Review Letters. College Pk: Amer Physical Soc, v. 101, n. 18, p. 7, 2008.
- 7
- Amer Physical Soc
- http://dx.doi.org/10.1103/PhysRevLett.101.182004
- http://hdl.handle.net/11449/24486
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/24486
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