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Beauty production in pp collisions at $\sqrt{s}$ = 2.76 TeV measured via semi-electronic decays

B. Abelev Laurent Aphecetche 1 Guillaume Batigne 1 I. Belikov 2 C. Cheshkov 3 B. Cheynis 3 H. Delagrange 1 L. Ducroux 3 B. Erazmus 1 Magali Estienne 1 J.-Y. Grossiord 3 M. Guilbaud 3 A. Lardeux 1 A. Maire 2 Gines Martinez Garcia 1 J. Martin Blanco 1 A. Mas 1 L. Massacrier 1 L. Molnar 2 A. Morreale 1 Philippe Pillot 1 L. Ronflette 1 C. Roy 2 Y. Schutz 1 Alexandre Shabetai 1 Diego Stocco 1 R. Tieulent 3 A. Uras 3 R. Vernet 4 M. Wang 1 Y. Zoccarato 3 G. Conesa Balbastre 5 J. Faivre 5 C. Furget 5 R. Guernane 5 S. Kox 5 J.S. Real 5 C. Silvestre 5 Y.W. Baek 6 V. Barret 6 N. Bastid 6 A. Batista Camejo 6 P. Crochet 6 P. Dupieux 6 Marie Germain 1 S. Li 6 X. Lopez 6 F. Manso 6 M. Marchisone 6 S. Porteboeuf-Houssais 6 P. Rosnet 6 L. Valencia Palomo 6 B. Vulpescu 6 Z. Conesa Del Valle 7 I. Das 7 B. Espagnon 7 C. Hadjidakis 7 I. Lakomov 7 C. Suire 7 J. D. Tapia Takaki 7 L. Valencia Palomo 7 A. Baldisseri 8 Herve Borel 8 Javier Castillo Castellanos 8 Jean-Luc Charvet 8 Hugo Pereira da Costa 8 A Rakotozafindrabe 9, 8
Abstract : 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 < p(T)< 10 GeV/c, in pp collisions at root 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, sigma(b -> e) = 3.47 +/- 0.40(stat)(+1.12)(-1.33)(sys) +/- 0.07(norm) mu b, was extrapolated to full phase space using Fixed Order plus Next-to-Leading Log (FONLL) calculations to obtain the total b (b) over bar production cross section, sigma(b (b) over bar) = 130 +/- 15.1(stat)(+42.1)(-49.8)(sys)(+3.4)(-3.1)(extr) +/- 2.5(norm) +/- 4.4(BR) mu b. (C).
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Submitted on : Monday, May 19, 2014 - 7:07:42 AM
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B. Abelev, Laurent Aphecetche, Guillaume Batigne, I. Belikov, C. Cheshkov, et al.. Beauty production in pp collisions at $\sqrt{s}$ = 2.76 TeV measured via semi-electronic decays. Physics Letters B, Elsevier, 2014, 738, pp.97-108. ⟨10.1016/j.physletb.2014.09.026⟩. ⟨in2p3-00992581⟩

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