https://doi.org/10.1140/epjc/s10052-023-12007-7
Regular Article - Theoretical Physics
Transverse momentum and multiplicity dependence of
ratio in pp collisions at
TeV
1
School of Physical Science and Intelligent Engineering, Jining University, 273155, Jining, Shandong, China
2
School of Physics and Physical Engineering, Qufu Normal University, 273165, Jining, Shandong, China
Received:
3
May
2023
Accepted:
5
September
2023
Published online:
23
September
2023
We apply an equal-velocity quark combination model to study the ratio in the range
GeV/c in pp collisions at
TeV. We decompose the ratio into four parts which are related to quark numbers, light-flavor quark
spectrum, charm quark
spectrum, momentum correlation between light and charm quarks, respectively. Their influence on
ratio is individually studied. The curvature property of light-flavor quark
spectrum is the main reason of the non-monotonic
dependence of
ratio exhibited in high multiplicity events. Moreover, the multiplicity dependence of
ratio as the function of
is mainly because of the multiplicity dependence of light-flavor quark
spectrum. Using the light-flavor quark
spectrum obtained from experimental data of light-flavor hadrons and charm quark
spectrum obtained from FONLL and/or PYTHIA calculations, the
dependence of experimental data of
ratio in high multiplicity events and that in low multiplicity events in pp collisions at
TeV are reasonably understood.
J.S. and H.H.L. are supported by Shandong Province Natural Science Foundation under Grant Nos. ZR2019YQ06 and ZR2019MA053, and Higher Educational Youth Innovation Science and Technology Program of Shandong Province (2019KJJ010). F.L.S. is supported by the National Natural Science Foundation of China under Grant Nos. 11975011.
© The Author(s) 2023
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