Speaker
Ms
lili li
(Shanxi University)
Description
Transverse momentum spectra of negative and
positive pions produced at mid-(pseudo)rapidity in inelastic or
non-single-diffractive proton-proton ($pp$) collisions over a
center-of-mass energy, $\sqrt{s}$, range from a few GeV to above
10 TeV are analyzed by the blast-wave model with Boltzmann-Gibbs
(Tsallis) statistics. The model results are well fitting to the
experimental data measured by the NA61/SHINE, PHENIX, STAR, ALICE,
and CMS Collaborations. In a particular superposition with
Hagedorn function, both excitation functions of kinetic freeze-out
temperature ($T_0$) of emission source and transverse flow
velocity ($\beta_T$) of produced particles obtained from a given
selection in the blast-wave model with Boltzmann-Gibbs statistics
have a hill at $\sqrt{s}\approx10$ GeV, a drop at dozens of GeV,
and then an increase from dozes of GeV to above 10 TeV.
Nevertheless, both excitation functions of $T_0$ and $\beta_T$
obtained in the blast-wave model with Tsallis statistics do not
show such a complex structure, but a very low hill. In another
selection for the parameters or in the superposition with the
usual step function, $T_0$ and $\beta_T$ increase slightly from a
few GeV to above 10 TeV.
| Sessions (parallel only) | Heavy Ions |
|---|---|
| Type | Parallel talk |
Primary author
Ms
lili li
(Shanxi University)
