Productions of hadrons, pentaquarksΘ+andΘ*++, and di-baryon

Feng-lan Shao

¹

,

Qingguo Xie

²

,

Qun Wang

³

Abstract

The hadron production in relativistic heavy ion collisions is well described by the quark combination model. The mixed ratios for various hadrons and the transverse momentum spectra for long-life hadrons are predicted and agree with recent RHIC data. The production rates for the pentaquarks Θ + , Θ * ++ and the di-baryon (ΩΩ) 0 + are estimated, neglecting the effect from the transition amplitude for constituent quarks to form an exotic state.

Baryon-antibaryon production asymmetry in relativistic heavy ion collisions

“…In Fig. 1, we show the results of R B/M (z) and RB /M (z) which reproduce the numerical results of SDQCM [26].…”

“…This linearity is supported by the RHIC data, which show that the multiplicity of charged particles in central and semicentral nucleus-nucleus collisions is of nearly linear proportion to the number of participant nucleons N part [24] while thep/π − yield ratio, even at LHC energies [12], is almost independent of N part [7,25]. Calculations of the quark combination model developed by the Shandong Group (SDQCM) [26] also support such a property. Letting λ is a not very small auxiliary parameter, we thus have…”

New insights into hadron production mechanism from pT spectra in pp collisions at s=7 Gou1, Shao2, Wang3 et al. 2017Phys. Rev. DSelf Cite222370View full textAdd to dashboardCite

“…A quark and an antiquark neighboring in phase space form a meson and three quarks (antiquarks) form a baryon (antibaryon). Relativistic heavy-ion collisions produce a large volume of deconfined quark matter and this makes QCM to be a natural scenario for hadronization [31][32][33][34][35][36][37][38][39][40][41].…”

“…In the latest work [28], we found that the data of p T spectra of identified hadrons in p-Pb collisions at √ s NN = 5.02 TeV [7,9,10,26,27] released by ALICE collaboration exhibit a striking quark number scaling. This scaling property is a direct consequence of quark (re-)combination mechanism (QCM) at hadronization [29][30][31][32][33][34], and it indicates the constituent quark degrees of freedom play an important rule in hadron production of small systems produced at LHC energies. We surprisingly found that quark number scaling seems to also hold in 40-60% and 60-80% multiplicity classes of p- * shaofl@mail.sdu.edu.cn † songjun2011@jnxy.edu.cn Pb collisions where the charged-particle multiplicity density at mid-rapidity is relatively small, i.e., dN ch /dη ∼ 10 − 20.…”

An investigation of hadronization mechanism at a Z 0 factory

“…The main method is to compare results of various hadronization models with the data, and the future Z 0 factory is very suitable for this purpose. The popular hadronization models at the market, Lund String Fragmentation Model (LSFM) [ [7][8][9][10]. QCM was first proposed by Annisovich and Bjorken et al [11].…”