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 inelastic proton-proton collisions at a centre-of-mass energy of 7 TeV. The transverse momentum (p(T)) distributions were studied at mid-rapidity (vertical bar y vertical bar < 0.5) in the range of 0.6 < p(T) < 8.5 GeV/c Xi(-) for and Xi(+) baryons, and in the range of 0.8 < P-T < 5 GeV/c for Omega(-) and<(Omega)over bar>(+). Baryons and antibaryons 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 data has allowed us to measure a difference between the mean p(T) of Xi(-) ((Xi) over bar)(+) and Omega(-) ((Omega) over bar (+)). Particle yields, mean pi, and the spectra in the intermediate pi 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) over bar (+)). This PYTHIA tune approaches the pi spectra of Xi(-) and Xi(+) baryons below p(T) <0.85 GeV/c and describes the Xi(-) and Xi(+) spectra above p(T) > 6.0 GeV/c. We also illustrate the difference between the experimental data and model by comparing the corresponding ratios of (Omega(-) +(Omega) over bar (+))/(Xi(-) + Xi(+)) as a function of transverse mass. (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.

Autore Pugliese

• Mastroserio Annalisa

Tutti gli autori

• Abelev B , Adam J , Adamova D , Adare Am , Aggarwal Mm , Rinella Ga , Agocs Ag , Agostinelli A , Salazar Sa , Ahammed Z , Ahmad N , Masoodi Aa , Ahn Su , Akindinov A , Aleksandrov D , Alessandro B , Molina Ra , Alici A , Alkin A , Avina Ea , Alme J , Alt T , Altini V , Altinpinar S , Altsybeev I , Andrei C , Andronic A , Anguelov V , Anielski J , Anson C , Anticic T , Antinori F , Antonioli P , Aphecetche L , Appelshauser H , Arbor N , Arcelli S , Arend A , Armesto N , Arnaldi R , Aronsson T , Arsene Ic , Arslandok M , Asryan A , Augustinus A , Averbeck R , Awes Tc , Aysto J , Azmi Md , Bach M , Badala A , Baek Yw , Bailhache R , Bala R , Ferroli Rb , Baldisseri A , Baldit A , Pedrosa Fbd , Ban J , Baral Rc , Barbera R , Barile F , Barnafoldi Gg , Barnby Ls , Barret V , Bartke J , Basile M , Bastid N , Basu S , Bathen B , Batigne G , Batyunya B , Baumann C , Bearden Ig , Beck H , Belikov I , Bellini F , Bellwied R , Belmont Moreno E , Bencedi G , Beole S , Berceanu I , Bercuci A , Berdnikov Y , Berenyi D , Berzano D , Betev L , Bhasin A , Bhati Ak , Bhom J , Bianchi N , Bianchi L , Bianchin C , Bielcik J , Bielcikova J , Bilandzic A , Bjelogrlic S , Blanco F , Blanco F , Blau D , Blume C , Boccioli M , Bock N , Bottger S , Bogdanov A , Boggild H , Bogolyubsky M , Boldizsar L , Bombara M , Book J , Borel H , Borissov A , Bose S , Bossu F , Botje M , Boyer B , Braidot E , Braun Munzinger P , Bregant M , Breitner T , Browning Ta , Broz M , Brun R , Bruna E , Bruno Ge , Budnikov D , Buesching H , Bufalino S , Bugaiev K , Busch O , Buthelezi Z , Orduna Dc , Caffarri D , Cai X , Caines H , Villar Ec , Camerini P , Roman Vc , Romeo Gc , Carena W , Carena F , Carlin N , Carminati F , Montoya Cac , Diaz Ac , Castellanos Jc , Hernandez Jfc , Casula Ear , Catanescu V , Cavicchioli C , Sanchez Cc , Cepila J , Cerello P , Chang B , Chapeland S , Charvet Jl , Chattopadhyay S , Chattopadhyay S , Chawla I , Cherney M , Cheshkov C , Cheynis B , Barroso Vc , Chinellato Dd , Chochula P , Chojnacki M , Choudhury S , Christakoglou P , Christensen Ch , Christiansen P , Chujo T , Chung Su , Cicalo C , Cifarelli L , Cindolo F , Cleymans J , Coccetti F , Colamaria F , Colella D , Balbastre Gc , del Valle Zc , Constantin P , Contin G , Contreras Jg , Cormier Tm , Morales Yc , Cortese P , Maldonado Ic , Cosentino Mr , Costa F , Cotallo Me , Crescio E , Crochet P , Alaniz Ec , Cuautle E , Cunqueiro L , Dainese A , Dalsgaard Hh , Danu A , Das I , Das K , Das D , Dash A , Dash S , De S , de Barros Gov , De Caro A , de Cataldo G , de Cuveland J , De Falco A , De Gruttola D , Delagrange H , Deloff A , Demanov V , De Marco N , Denes E , De Pasquale S , Deppman A , Erasmo Gd , de Rooij R , Corchero Mad , Di Bari D , Dietel T , Di Liberto S , Di Mauro A , Di Nezza P , Divia R , Djuvsland O , Dobrin A , Dobrowolski T , Dominguez I , Donigus B , Dordic O , Driga O , Dubey Ak , Ducroux L , Dupieux P , Majumdar Akd , Majumdar Mrd , Elia D , Emschermann D , Engel H , Erdal Ha , Espagnon B , Estienne M , Esumi S , Evans D , Eyyubova G , Fabris D , Faivre J , Falchieri D , Fantoni A , Fasel M , Fearick R , Fedunov A , Fehlker D , Feldkamp L , Felea D , Fenton Olsen B , Feofilov G , Tellez Af , Ferretti R , Ferretti A , Figiel J , Figueredo Mas , Filchagin S , Finogeev D , Fionda Fm , Fiore Em , Floris M , Foertsch S , Foka P , Fokin S , Fragiacomo E , Frankenfeld U , Fuchs U , Furget C , Girard Mf , Gaardhoje Jj , Gagliardi M , Gago A , Gallio M , Gangadharan Dr , Ganoti P , Garabatos C , Garcia Solis E , Garishvili I , Gerhard J , Germain M , Geuna C , Gheata A , Gheata M , Ghidini B , Ghosh P , Gianotti P , Girard Mr , Giubellino P , Gladysz Dziadus E , Glassel P , Gomez R , Ferreiro Eg , Gonzalez Trueba Lh , Gonzalez Zamora P , Gorbunov S , Goswami A , Gotovac S , Grabski V , Graczykowski Lk , Grajcarek R , Grelli A , Grigoras A , Grigoras C , Grigoriev V , Grigoryan A , Grigoryan S , Grinyov B , Grion N , Gros P , Grosse Oetringhaus Jf , Grossiord Jy , Grosso R ,

Titolo volume/Rivista

PHYSICS LETTERS. SECTION B

Anno di pubblicazione

2012

ISSN

0370-2693

ISBN

Non Disponibile

Numero di citazioni Wos

51

Ultimo Aggiornamento Citazioni

Non Disponibile

Numero di citazioni Scopus

55

Ultimo Aggiornamento Citazioni

Non Disponibile

Settori ERC

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Codici ASJC

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