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 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 4.9 fb−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 <
pT < 100 GeV. The measurements show a transition from an exponential to a powerlaw
behavior at pT ≈ 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 pT increases
at low pT, then become flatter at higher pTWe congratulate our colleagues in the CERN accelerator departments
for the excellent performance of the LHC and thank the
technical and administrative staffs at CERN and at other CMS institutes
for their contributions to the success of the CMS effort.
In addition, we gratefully acknowledge the computing centers and
personnel of the Worldwide LHC Computing Grid for delivering so
effectively the computing infrastructure essential to our analyses.
Finally, we acknowledge the enduring support for the construction
and operation of the LHC and the CMS detector provided by
the following funding agencies: BMWFW and FWF (Austria); FNRS
and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil);
MES (Bulgaria); CERN; CAS, MOST, and NSFC (China); COLCIENCIAS
(Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT
and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland);
CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany);
GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India);
IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic
of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV,
CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC
(Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna);
MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and
CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei);
ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE
and NSF (USA).
Individuals have received support from the Marie-Curie program
and the European Research Council and EPLANET (European
Union); the Leventis Foundation; the A.P. Sloan Foundation; the
Alexander von Humboldt Foundation; the Belgian Federal Science
Policy Office; the Fonds pour la Formation à la Recherche dans
l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap
voor Innovatie door Wetenschap en Technologie (IWT-Belgium);
the Ministry of Education, Youth and Sports (MEYS) of the Czech
Republic; the Council of Science and Industrial Research, India;
the HOMING PLUS program of Foundation for Polish Science, co-
financed from European Union, Regional Development Fund; the
Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste);
MIUR project 20108T4XTM (Italy); the Thalis and Aristeia
programs cofinanced by EU-ESF and the Greek NSRF; and the
National Priorities Research Program by Qatar National Research
Fun