Title
Measurement of the Λb cross section and the Λ-b to Λb ratio with J/ψΛ decays in pp collisions at s=7 TeV
Date Issued
14 August 2012
Access level
open access
Resource Type
journal article
Author(s)
Chatrchyan S.
Khachatryan V.
Sirunyan A.M.
Tumasyan A.
Adam W.
Bergauer T.
Dragicevic M.
Erö J.
Fabjan C.
Friedl M.
Frühwirth R.
Ghete V.M.
Hammer J.
Hörmann N.
Hrubec J.
Jeitler M.
Kiesenhofer W.
Knünz V.
Krammer M.
Liko D.
Mikulec I.
Pernicka M.
Rahbaran B.
Rohringer C.
Rohringer H.
Schöfbeck R.
Strauss J.
Taurok A.
Wagner P.
Waltenberger W.
Walzel G.
Widl E.
Wulz C.E.
Mossolov V.
Shumeiko N.
Suarez Gonzalez J.
Bansal S.
Cornelis T.
De Wolf E.A.
Janssen X.
Luyckx S.
Maes T.
Mucibello L.
Ochesanu S.
Roland B.
Rougny R.
Selvaggi M.
Staykova Z.
Van Haevermaet H.
Van Mechelen P.
Van Remortel N.
Van Spilbeeck A.
Blekman F.
Blyweert S.
D'Hondt J.
Gonzalez Suarez R.
Kalogeropoulos A.
Maes M.
Olbrechts A.
Van Doninck W.
Van Mulders P.
Van Onsem G.P.
Villella I.
Charaf O.
Clerbaux B.
De Lentdecker G.
Dero V.
Gay A.P.R.
Hreus T.
Léonard A.
Marage P.E.
Reis T.
Thomas L.
Vander Velde C.
Vanlaer P.
Wang J.
Adler V.
Beernaert K.
Cimmino A.
Costantini S.
Garcia G.
Grunewald M.
Klein B.
Lellouch J.
Marinov A.
Mccartin J.
Ocampo Rios A.A.
Ryckbosch D.
Strobbe N.
Thyssen F.
Tytgat M.
Vanelderen L.
Verwilligen P.
Walsh S.
Yazgan E.
Zaganidis N.
Basegmez S.
Bruno G.
Castello R.
Ceard L.
Publisher(s)
Elsevier B.V.
Abstract
The Λ b differential production cross section and the cross section ratio σ(Λ-b)/σ(Λb) are measured as functions of transverse momentum pTΛb and rapidity |y Λb| in pp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Λ b decays reconstructed in the exclusive final state J/ψΛ, with the subsequent decays J/ψ→μ +μ - and Λ→pπ, using a data sample corresponding to an integrated luminosity of 1.9 fb -1. The product σ(Λb)×B(Λb→J/ψΛ) versus pTΛb falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ) for pTΛb>10 GeV and |y Λb|<2.0 is 1.16±0.06±0.12nb, and the integrated σ(Λ-b)/σ(Λb) ratio is 1.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively. © 2012 CERN.
Start page
136
End page
157
Volume
714
Issue
May 2
Language
English
OCDE Knowledge area
Física nuclear
Física de partículas, Campos de la Física
Subjects
Scopus EID
2-s2.0-84864527198
Source
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN of the container
03702693
Sponsor(s)
We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC machine. We thank the technical and administrative staff at CERN and other CMS institutes, and acknowledge support from: FMSR (Austria); FNRS and FWO (Belgium); CNPq , CAPES , FAPERJ , and FAPESP (Brazil); MES (Bulgaria); CERN ; CAS , MoST , and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); MoER , SF0690030s09 and ERDF (Estonia); Academy of Finland , MEC , and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF , DFG , and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Republic of Korea); LAS (Lithuania); CINVESTAV , CONACYT , SEP , and UASLP-FAI (Mexico); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON , RosAtom , RAS and RFBR (Russia); MSTD (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie programme and the European Research Council (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 lʼIndustrie et dans lʼAgriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Council of Science and Industrial Research , India; and the HOMING PLUS programme of Foundation for Polish Science , cofinanced from European Union, Regional Development Fund .
Sources of information:
Directorio de Producción Científica
Scopus