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Measurement of the Polarization of the Upsilon(1S) and Upsilon(2S) States in pp Collisions at s=1.96 TeV
University of Chicago.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 528
2008 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 101, no 18, 182004- p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2008. Vol. 101, no 18, 182004- p.
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-47373DOI: 10.1103/PhysRevLett.101.182004ISI: 000260574600025ScopusID: 2-s2.0-55849125824OAI: diva2:454886
QC 20111108 Author Count: 528Available from: 2011-11-08 Created: 2011-11-08 Last updated: 2012-02-01Bibliographically approved

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Gollub, NilsStrandberg, Jonas
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