Multiplicity dependence of K*(892)0 and ϕ(1020) production in pp collisions at s=13 TeV

$$K^{*}(892)^0$$ meson production in inelastic p+p interactions at 158 $$\text{ Ge }\text{ V }\!/\!c$$ beam momentum measured by NA61/SHINEat the CERN SPS

“…This emphasizes the need to obtain high precision p+p data at energies lower than the top RHIC energy. Continuing considerations for p+p collisions, a very intriguing effect was reported in the most recent ALICE analysis of the multiplicity dependence in p+p collisions [17,18]. The K * 0 / K ± and K * 0 /K 0 S ratios decrease when going from low-multiplicity to high-multiplicity p+p interactions at the LHC energies.…”

“…The study of K * (892) 0 and/or K * (892) 0 production in p+p collisions at RHIC energies was performed by the STAR [5] and PHENIX [19] experiments and at LHC ener-gies by ALICE [10,12,15,16,18,20]. The NA49 experiment performed the measurements in inelastic p+p collisions at beam momentum of 158 GeV/c (CERN SPS) [4].…”

Hyperfine splitting effects in string hadronization

“…To the right we show hadron yields measured by ALICE in low multiplicity pp collisions at 7 TeV (π ± , K 0 s , p, Λ 0 , Ξ ± and Ω − ) [1] and 13 TeV * 0 and φ) [46]. The data is again compared to PYTHIA default (blue) and with the HFS effects added (red).…”

“…Going to pp collisions in figure 4 (right), we show comparisons to ALICE data at low forward multiplicity 5 , at √ s = 7 TeV [1] and 13 TeV [46] respectively. At higher multiplicity we would expect rope effects (see section 1) to dominate, in particular for multi-strange baryon production, which is why we limit ourselves to the lowest multiplicity class.…”

“…Figure4: To the left we show φ production as function of Q 2 in neutral current DIS, as measured by ZEUS[45], compared to PYTHIA default (blue), PYTHIA with the epWZ12-EIG PDF (magenta) and finally with the hyperfine splitting effect (HFS) added on top (red).To the right we show hadron yields measured by ALICE in low multiplicity pp collisions at 7 TeV (π ± , K 0 s , p, Λ 0 , Ξ ± and Ω − )[1] and 13 TeV * 0 and φ)[46]. The data is again compared to PYTHIA default (blue) and with the HFS effects added (red).…”