Multi-strange baryon production in pp collisions at with ALICE
- 作者：ALICE Collaboration
- 关键词：Multi-strange baryons ; pT spectra ; Mid-rapidity ; Proton&ndash ; proton ; LHC ; ALICE
- 刊名：Physics Letters B
- 出版年：2012
- 期刊代码：58_03702693
- 类别：ph
- 出版时间：12 June, 2012
- 卷：712
- 期：4-5
- 页码：309-318
- 文件大小：517 K
摘要
A measurement of the multi-strange and 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 () distributions were studied at mid-rapidity () in the range of for and baryons, and in the range of for and . 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 of () and (). Particle yields, mean , and the spectra in the intermediate 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 (). This PYTHIA tune approaches the spectra of and baryons below and describes the and spectra above . We also illustrate the difference between the experimental data and model by comparing the corresponding ratios of as a function of transverse mass.