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

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

Differential cross sections as a function of transverse momentum p[subscript T] 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 4.9 fb[superscript −1] in pp collisions at √s = 7 TeV were collected with th...

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Bibliographic Details
Main Authors: Apyan, Aram, Barbieri, Richard Alexander, Bierwagen, Katharina, Busza, Wit, Cali, Ivan Amos, Di Matteo, Leonardo, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Gulhan, Doga Can, Klute, Markus, Lai, Yue Shi, Lee, Yen-Jie, Levin, Andrew Michael, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Velicanu, Dragos Alexandru, Veverka, Jan, Wyslouch, Boleslaw, Yang, Mingming, Zanetti, Marco, Luckey Jr, P David, Roland, Christof E, Roland, Gunther M, Sumorok, Konstanty C, Wyslouch, Victoria
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: Elsevier 2015
Online Access:http://hdl.handle.net/1721.1/98215
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0002-7945-005X
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0002-9418-6656
https://orcid.org/0000-0003-1486-606X
https://orcid.org/0000-0002-2622-8295
https://orcid.org/0000-0001-9236-6621
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0002-0869-5631
https://orcid.org/0000-0002-1136-6900
Description
Summary:Differential cross sections as a function of transverse momentum p[subscript T] 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 4.9 fb[superscript −1] in pp collisions at √s = 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<p[subscript T]<100 GeV. The measurements show a transition from an exponential to a power-law behavior at p[subscript T]≈20 GeV for the three ϒ states. Above that transition, the ϒ(3S) spectrum is significantly harder than that of the ϒ(1S). The ratios of the ϒ(3S) and ϒ(2S) differential cross sections to the ϒ(1S) cross section show a rise as p[subscript T] increases at low p[subscript T], then become flatter at higher p[subscript T].

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