Multiplicity dependence of charged pion, kaon, and (anti)proton production at large transverse momentum in p-Pb collisions at
详细信息    查看全文
文摘
The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity (k to view the MathML source">−0.5<y<0) in p–Pb collisions at View the MathML source using the ALICE detector at the LHC. Exploiting particle identification capabilities at high transverse momentum (k to view the MathML source">pT), the previously published k to view the MathML source">pT spectra have been extended to include measurements up to 20 GeV/c   for seven event multiplicity classes. The k to view the MathML source">pT spectra for pp collisions at View the MathML source, needed to interpolate a pp reference spectrum, have also been extended up to 20 GeV/c   to measure the nuclear modification factor (k to view the MathML source">RpPb) in non-single diffractive p–Pb collisions.

At intermediate transverse momentum (k to view the MathML source">2<pT<10 GeV/c) the proton-to-pion ratio increases with multiplicity in p–Pb collisions, a similar effect is not present in the kaon-to-pion ratio. The k to view the MathML source">pT dependent structure of such increase is qualitatively similar to those observed in pp and heavy-ion collisions. At high k to view the MathML source">pT (k to view the MathML source">>10 GeV/c), the particle ratios are consistent with those reported for pp and Pb–Pb collisions at the LHC energies.

At intermediate k to view the MathML source">pT the (anti)proton k to view the MathML source">RpPb shows a Cronin-like enhancement, while pions and kaons show little or no nuclear modification. At high k to view the MathML source">pT the charged pion, kaon and (anti)proton k to view the MathML source">RpPb are consistent with unity within statistical and systematic uncertainties.

NGLC 2004-2010.National Geological Library of China All Rights Reserved.
Add:29 Xueyuan Rd,Haidian District,Beijing,PRC. Mail Add: 8324 mailbox 100083
For exchange or info please contact us via email.