Abstract
AbstractWe apply an equal-velocity quark combination model to study the $$\varLambda _{c}^{+}/D^{0}$$
Λ
c
+
/
D
0
ratio in the range $$p_{T}\lesssim 10$$
p
T
≲
10
GeV/c in pp collisions at $$\sqrt{s}=13$$
s
=
13
TeV. We decompose the ratio into four parts which are related to quark numbers, light-flavor quark $$p_{T}$$
p
T
spectrum, charm quark $$p_{T}$$
p
T
spectrum, momentum correlation between light and charm quarks, respectively. Their influence on $$\varLambda _{c}^{+}/D^{0}$$
Λ
c
+
/
D
0
ratio is individually studied. The curvature property of light-flavor quark $$p_{T}$$
p
T
spectrum is the main reason of the non-monotonic $$p_{T}$$
p
T
dependence of $$\varLambda _{c}^{+}/D^{0}$$
Λ
c
+
/
D
0
ratio exhibited in high multiplicity events. Moreover, the multiplicity dependence of $$\varLambda _{c}^{+}/D^{0}$$
Λ
c
+
/
D
0
ratio as the function of $$p_{T}$$
p
T
is mainly because of the multiplicity dependence of light-flavor quark $$p_{T}$$
p
T
spectrum. Using the light-flavor quark $$p_{T}$$
p
T
spectrum obtained from experimental data of light-flavor hadrons and charm quark $$p_{T}$$
p
T
spectrum obtained from FONLL and/or PYTHIA calculations, the $$p_{T}$$
p
T
dependence of experimental data of $$\varLambda _{c}^{+}/D^{0}$$
Λ
c
+
/
D
0
ratio in high multiplicity events and that in low multiplicity events in pp collisions at $$\sqrt{s}=13$$
s
=
13
TeV are reasonably understood.
Funder
National Natural Science Foundation of China
Higher Educational Youth Innovation Science and Technology Program of Shandong Province
Shandong Province Natural Science Foundation
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)