First measurement of Ds1(1+)(2536)+ and D*s2 (2+)(2573)+ production in proton-proton collisions at √S=13S2Te V at the LHC

Abstract

The production yields of the orbitally excited charm-strange mesons D s 1 ( 1 + ) ( 2536 ) + and D s 2 * ( 2 + ) ( 2573 ) + were measured for the first time in proton-proton (pp) collisions at a center-of-mass energy of s = 13 TeV with the ALICE experiment at the LHC. The D s 1 + and D s 2 * + mesons were measured at midrapidity ( | y | 0.5 ) in minimum-bias and high-multiplicity pp collisions in the transverse-momentum interval 2 p T 24 GeV / c . Their production yields relative to the D s + ground-state yield were found to be compatible between minimum-bias and high-multiplicity collisions, as well as with previous measurements in e ± p and e + e − collisions. The measured D s 1 + / D s + and D s 2 * + / D s + yield ratios are described by statistical hadronization models and can be used to tune the parameters governing the production of excited charm-strange hadrons in Monte Carlo generators, such as 8.