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Multi-strange baryon production in pp collisions at (s)^1/2 = 7 TeV with ALICE

B. Abelev N. Arbor 1 G. Conesa Balbastre 1 J. Faivre 1 C. Furget 1 R. Guernane 1 S. Kox 1 Y. Mao 1 J.S. Real 1 C. Silvestre 1 R. Vernet 2 I. Belikov 3 B. Hippolyte 3 S. Jangal 3 C. Kuhn 3 A. Maire 3 C. Roy 3 X. Sanchez Castro 3 S. Senyukov 3 R. Wan 3 Laurent Aphecetche 4 Guillaume Batigne 4 M. Bregant 4 H. Delagrange 4 O. Driga 4 Magali Estienne 4 Marie Germain 4 A. Lardeux 4 F. Lefèvre 4 M. Lenhardt 4 L. Luquin 4 Gines Martinez Garcia 4 A. Mas 4 L. Massacrier 4, 5 A. Matyja 4 Philippe Pillot 4 Y. Schutz 4 Alexandre Shabetai 4 Diego Stocco 4 A. Baldisseri 6 H. Borel 6 J. Castillo Castellanos 6 J.L. Charvet 6 C. Cheshkov 5 B. Cheynis 5 L. Ducroux 5 C. Geuna 6 J.-Y. Grossiord 7 Maxime Guilbaud 5 S. Pal 6 H. Pereira da Costa 6 A. Rakotozafindrabe 6 R. Tieulent 5 A. Uras 5 Y. Zoccarato 5 Sang Un Ahn 8 Y.W. Baek 9 A. Baldit 9 V. Barret 9 N. Bastid 9 P. Crochet 9 P. Dupieux 9 R. Ichou 9 X. Lopez 9 F. Manso 9 M. Marchisone 9 S. Porteboeuf-Houssais 9 P. Rosnet 9 B. Vulpescu 9 X. Zhang 9 B. Boyer 10 B. Espagnon 10 Y. le Bornec 10
Abstract : A measurement of the multi-strange Xi- and Omega- baryons and their antiparticles by the ALICE experiment at the CERN Large Hadron Collider (LHC) is presented for proton-proton collisions at centre of mass energy of 7 TeV. The transverse momentum (pt) distributions were studied at mid-rapidity (|y| < 0.5) in the range of 0.6 < pt < 8.5 GeV/c for Xi- and Xi+ baryons, and in the range of 0.8 < pt < 5 GeV/c for Omega- and Omega+. Baryons and anti-baryons were measured as separate particles and we find that the baryon to antibaryon ratio of both particle species is consistent with unity over the entire range of the measurement. The statistical precision of the current LHC data has allowed us to measure a difference between the mean pt of Xi- (Xi+) and Omega- (Omega+). Particle yields, mean pt, and the spectra in the intermediate pt range are not well described by the PYTHIA Perugia 2011 tune Monte Carlo event generator, which has been tuned to reproduce the early LHC data. The discrepancy is largest for Omega- (Omega+). This PYTHIA tune approaches the pt spectra of Xi- and Xi+ baryons below pt < 0.85 GeV/c and describes the Xi- and Xi+ spectra above pt > 6.0 GeV/c. We also illustrate the difference between the experimental data and model by comparing the corresponding ratios of (Omega-+Omega+)/(Xi-+Xi+) as a function of transverse mass.
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Contributor : Emmanuelle Vernay Connect in order to contact the contributor
Submitted on : Tuesday, April 3, 2012 - 8:47:25 AM
Last modification on : Thursday, December 16, 2021 - 2:11:29 PM

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B. Abelev, N. Arbor, G. Conesa Balbastre, J. Faivre, C. Furget, et al.. Multi-strange baryon production in pp collisions at (s)^1/2 = 7 TeV with ALICE. Physics Letters B, Elsevier, 2012, 712, pp.309-318. ⟨10.1016/j.physletb.2012.05.011⟩. ⟨in2p3-00684720⟩



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