Bottom Hadrochemistry in High-Energy Hadronic Collisions

被引:15
作者
He, Min [1 ]
Rapp, Ralf [2 ,3 ]
机构
[1] Nanjing Univ Sci & Technol, Dept Appl Phys, Nanjing 210094, Peoples R China
[2] Texas A&M Univ, Cyclotron Inst, College Stn, TX 77843 USA
[3] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA
基金
中国国家自然科学基金; 美国国家科学基金会;
关键词
QUARK; FRAGMENTATION; QCD;
D O I
10.1103/PhysRevLett.131.012301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The hadrochemistry of bottom quarks (b) produced in hadronic collisions encodes valuable information on the mechanism of color neutralization in these reactions. Since the b-quark mass is much larger than the typical hadronic scale of & SIM;1 GeV, bb over bar pair production is expected to be well separated from subsequent hadronization processes. A significantly larger fraction of b baryons has been observed in proton-proton (pp) and proton-antiproton (pp over bar ) reactions relative to e+e- collisions, challenging theoretical descriptions. We address this problem by employing a statistical hadronization approach with an augmented set of b-hadron states beyond currently measured ones, guided by the relativistic quark model and lattice-QCD computations. Assuming relative chemical equilibrium between different b-hadron yields, thermal densities are used as fragmentation weights of b quarks into various hadron species. With quark model estimates of the decay patterns of excited states, the fragmentation fractions of weakly decaying b hadrons are computed and found to agree with measurements in pp over bar collisions at the Tevatron. By combining transverse-momentum (pT) distributions of b quarks from perturbative QCD with thermal weights and independent fragmentation toward high pT, a fair description of the pT-dependent B over bar & DEG;s=B- and ?& DEG;b=B- ratios measured in pp collisions at the LHC is obtained. The observed enhancement of ?& DEG;b production is attributed to the feeddown from thus far unobserved excited b baryons. Finally, we implement the hadrochemistry into a strongly coupled transport approach for b quarks in heavy-ion collisions, utilizing previously determined b-quark transport coefficients in the quark-gluon plasma, to highlight the modifications of hadrochemistry and collective behavior of b hadrons in Pb-Pb collisions at the LHC.
引用
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页数:7
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