The ALICE collaboration at the LHC reports measurement of the inclusive production cross section of electrons from semi-leptonic decays of beauty hadrons with rapidity |y|<0.8 and transverse momentum 1<pT<10 GeV/c, in pp collisions at s=2.76 TeV. Electrons not originating from semi-electronic decay of beauty hadrons are suppressed using the impact parameter of the corresponding tracks. The production cross section of beauty decay electrons is compared to the result obtained with an alternative method which uses the distribution of the azimuthal angle between heavy-flavour decay electrons and charged hadrons. Perturbative QCD predictions agree with the measured cross section within the experimental and theoretical uncertainties. The integrated visible cross section, σb→e=3.47±0.40(stat)−1.33 +1.12(sys)±0.07(norm) μb, was extrapolated to full phase space using Fixed Order plus Next-to-Leading Log (FONLL) calculations to obtain the total bb¯ production cross section, σbb¯=130±15.1(stat)−49.8 +42.1(sys)−3.1 +3.4(extr)±2.5(norm)±4.4(BR) μb.
|Number of pages||12|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2014 Nov 10|
Bibliographical noteFunding Information:
The ALICE Collaboration would like to thank all its engineers and technicians for their invaluable contributions to the construction of the experiment and the CERN accelerator teams for the outstanding performance of the LHC complex. The ALICE Collaboration gratefully acknowledges the resources and support provided by all Grid centres and the Worldwide LHC Computing Grid (WLCG) Collaboration. The ALICE Collaboration acknowledges the following funding agencies for their support in building and running the ALICE detector: State Committee of Science, World Federation of Scientists (WFS) and Swiss Fonds Kidagan , Armenia, Conselho Nacional de Desenvolvimento Científico e Tecnológico ( CNPq ), Financiadora de Estudos e Projetos (FINEP), Fundação de Amparo à Pesquisa do Estado de São Paulo ( FAPESP ); National Natural Science Foundation of China ( NSFC ), the Chinese Ministry of Education (CMOE) and the Ministry of Science and Technology of China (MSTC); Ministry of Education and Youth of the Czech Republic ; Danish Natural Science Research Council , the Carlsberg Foundation and the Danish National Research Foundation ; The European Research Council under the European Community's Seventh Framework Programme; Helsinki Institute of Physics and the Academy of Finland ; French CNRS-IN2P3 , the ‘Region Pays de Loire’ , ‘Region Alsace’ , ‘Region Auvergne’ and CEA, France ; German BMBF and the Helmholtz Association ; General Secretariat for Research and Technology , Ministry of Development, Greece ; Hungarian OTKA and National Office for Research and Technology ( NKTH ); Department of Atomic Energy and Department of Science and Technology of the Government of India ; Istituto Nazionale di Fisica Nucleare ( INFN ) and Centro Fermi – Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” , Italy; MEXT Grant-in-Aid for Specially Promoted Research, Japan; Joint Institute for Nuclear Research , Dubna; National Research Foundation of Korea ( NRF ); CONACYT , DGAPA , México, ALFA-EC and the EPLANET Program (European Particle Physics Latin American Network) Stichting voor Fundamenteel Onderzoek der Materie ( FOM ) and the Nederlandse Organisatie voor Wetenschappelijk Onderzoek ( NWO ), Netherlands; Research Council of Norway (NFR); Polish Ministry of Science and Higher Education ; National Science Centre, Poland ; Ministry of National Education/Institute for Atomic Physics and CNCS-UEFISCDI – Romania ; Ministry of Education and Science of Russian Federation , Russian Academy of Sciences , Russian Federal Agency of Atomic Energy , Russian Federal Agency for Science and Innovations and The Russian Foundation for Basic Research ; Ministry of Education of Slovakia ; Department of Science and Technology, South Africa ; CIEMAT , EELA , Ministerio de Economía y Competitividad ( MINECO ) of Spain, Xunta de Galicia (Consellería de Educación) , CEADEN , Cubaenergía, Cuba , and IAEA ( International Atomic Energy Agency ); Swedish Research Council (VR) and Knut & Alice Wallenberg Foundation (KAW); Ukraine Ministry of Education and Science ; United Kingdom Science and Technology Facilities Council ( STFC ); The United States Department of Energy , the United States National Science Foundation , the State of Texas , and the State of Ohio .
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics