Measurement of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) Polarizations in pp Collisions at root s 7 TeV

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doi:10.1103/PhysRevLett.110.081802

The polarizations of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) mesons are measured in proton-proton collisions at root s = 7 TeV, using a data sample of Upsilon(nS) -> mu(+)mu(-) decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb(-1). The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters lambda(theta), lambda(phi), and lambda(theta phi), as well as the frame-invariant quantity (lambda) over tilde, are presented as a function of the Upsilon(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges vertical bar y vertical bar < 0: 6 and 0: 6 < vertical bar y vertical bar < 1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region. DOI: 10.1103/PhysRevLett.110.081802 RI Lokhtin, Igor/D-7004-2012; Ruiz, Alberto/E-4473-2011; Tinoco Mendes, Andre David/D-4314-2011; Raidal, Martti/F-4436-2012; Novaes, Sergio/D-3532-2012; Wulz, Claudia-Elisabeth/H-5657-2011; Fruhwirth, Rudolf/H-2529-2012; Janssen, Xavier/E-1915-2013; de Jesus Damiao, Dilson/G-6218-2012 OI Ruiz, Alberto/0000-0002-3639-0368; Tinoco Mendes, Andre David/0000-0001-5854-7699; Novaes, Sergio/0000-0003-0471-8549; de Jesus Damiao, Dilson/0000-0002-3769-1680