Measurements of the Υ(1S), Υ(2S), and Υ(3S) differential cross sections in pp collisions at √s=7TeV

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URI: http://hdl.handle.net/10902/13954
ISSN: 0370-2693
ISSN: 1873-2445
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Autoría
Khachatryan, Vladimir; Brochero Cifuentes, Javier AndrésAutoridad Unican; Cabrillo Bartolomé, José IbanAutoridad Unican; Calderón Tazón, AliciaAutoridad Unican; Duarte Campderros, JorgeAutoridad Unican; Fernández García, MarcosAutoridad Unican; Gómez Gramuglio, GervasioAutoridad Unican; Graziano, Alberto; López Virto, María Amparo; Marco de Lucas, JesúsAutoridad Unican; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, FranciscoAutoridad Unican; Muñoz Sánchez, Francisca Javiela; Piedra Gómez, JonatanAutoridad Unican; Rodrigo Anoro, TeresaAutoridad Unican; Rodríguez Marrero, Ana Yaiza; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, LucaAutoridad Unican; [et al.]
Fecha
2015-10
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Attribution 4.0 International © CERN for the benefit of the CMS collaboration
Publicado en
Physics Letters B, Vol. 749, Pp. 14–34, 2015
Editorial
Elsevier
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Resumen/Abstract
Differential cross sections as a function of transverse momentum pT are presented for the production of Υ(nS)(n=1,2,3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb-1in pp collisions at vs=7 TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity |y| <1.2 and dimuon transverse momentum in the range 10 <pT<100 GeV. The measurements show a transition from an exponential to a power-law behavior at pT˜20 GeV for the three ? states. Above that transition, the ?(3S) spectrum is significantly harder than that of the ?(1S). The ratios of the Υ(3S)and Υ(2S) differential cross sections to the Υ(1S cross section show a rise as pT increases at low pT, then become flatter at higher pT.
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