Multiplicity dependence of light (anti-)nuclei production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The measurement of the deuteron and anti-deuteron production in the rapidity range $-1<y<0$ as a function of transverse momentum and event multiplicity in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV is presented. (Anti-)deuterons are identified via their specific energy loss $\mathrm{d}E/\mathrm{d}\mathrm{x}$ and via their time-of-flight. Their production in p-Pb collisions is compared to pp and Pb-Pb collisions and is discussed within the context of thermal and coalescence models. The ratio of integrated yields of deuterons to protons (d/p) shows a significant increase as a function of the charged-particle multiplicity of the event starting from values similar to those observed in pp collisions at low multiplicities and approaching those observed in Pb-Pb collisions at high multiplicities. The mean transverse momenta are extracted from the deuteron spectra and the values are similar to those obtained for p and $\Lambda$ particles. Thus, deuteron spectra do not follow mass ordering. This behaviour is in contrast to the trend observed for non-composite particles in p-Pb collisions. In addition, the production of the rare ${}^3\mathrm{He}$ and ${}^3\overline{\mathrm{He}}$ nuclei has been studied. The spectrum corresponding to all non-single diffractive p-Pb collisions is obtained in the rapidity window $-1<y<0$ and the $p_{\mathrm{T}}$-integrated yield d$N$/d$y$ is extracted. It is found that the yields of protons, deuterons, and ${}^3\mathrm{He}$, normalised by the spin degeneracy factor, follow an exponential decrease with mass number.

23 pages, 9 captioned figures, 3 tables, authors from page 18, published version, figures at http://alice-publications.web.cern.ch/node/5355

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