Invariant differential yields of deuterons and anti-deuterons in pp collisions at $\sqrt{ s}$ = 0.9, 2.76 and 7 TeV and the yields of tritons, $^{ 3}$He nuclei and their anti-nuclei at $\sqrt{ s}$ = 7 TeV have been measured with the ALICE detector at the CERN Large Hadron Collider. The measurements cover a wide transverse momentum ($p_{ \text{ T}}$) range in the rapidity interval $|y|<0.5$, extending both the energy and the $p_{ \text{ T}}$ reach of previous measurements up to 3 GeV/$c$ for $A=2$ and 6 GeV/$c$ for $A=3$. The coalescence parameters of (anti-)deuterons and $^{ 3}\overline{ \text{ He}}$ nuclei exhibit an increasing trend with $p_{ \text{ T}}$ and are found to be compatible with measurements in pA collisions at low $p_{ \text{ T}}$ and lower energies. The integrated yields decrease by a factor of about 1000 for each increase of the mass number with one (anti-)nucleon. Furthermore, the deuteron-to-proton ratio is reported as a function of the average charged particle multiplicity at different center-of-mass energies.
Categories: nucl-ex hep-ex