论文标题
高能辐射碰撞中的底部辐射化学
Bottom hadro-chemistry in high-energy hadronic collisions
论文作者
论文摘要
在HADRONIC碰撞中产生的Bottom Quarks（$ b $）的Hadro化学编码有关这些反应中颜色中和化机制的有价值的信息。由于$ b $ QUARK质量比典型的HADRONIC量表$ \ sim $ 1 \，GEV，$ b \ bar b $ pail Production预计将与随后的强龙过程分开。相对于$ e^+e^ - $ collisions，在质子 - 蛋白质（$ pp $）和质子 - 抗烷（$ p \ bar {p} $）反应中，已经观察到$ b $ baryons的比例明显更大。我们通过采用统计强化方法，并在相对论夸克模型和lattice-QCD计算的指导下采用统计强化方法，并采用增强的$ b $ hadron状态。假设{\ IT相对}不同$ b $ - hADRON产量之间的化学平衡，则热密度用作$ b $ quarks的碎片重量，用于各种强子物种。通过对激发态的衰减模式的夸克模型估计，计算并发现弱化$ b $ hadron的碎片分数与$ p \ bar {p} $ collisions中的测量值一致。 By combining transverse-momentum ($p_T$) distributions of $b$-quarks from perturbative QCD with thermal weights and independent fragmentation toward high $p_T$, a fair description of the $p_T$-dependent $\bar{B}_s^0/B^-$ and $Λ_b^0/B^-$ ratios measured in $pp$ collisions at the LHC is obtained.最后，我们将HADRO化学实施为$ b $ b $ quarks在重型离子碰撞中的强键交通方式，利用先前确定的$ b $ b $ quark-quark运输系数在夸克 - 葡萄糖等离子中，以强调$ b $ bb-pb-pb-pb callisions $ b $ hadrons callisions callisions callcission callcission pb $ hadrons callcission callcission callcission pb $ hadrons callisions callcisions的修改。
The hadro-chemistry 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, $b\bar b$ 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 ($p\bar{p}$) 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 {\it 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 $p\bar{p}$ collisions at the Tevatron. By combining transverse-momentum ($p_T$) distributions of $b$-quarks from perturbative QCD with thermal weights and independent fragmentation toward high $p_T$, a fair description of the $p_T$-dependent $\bar{B}_s^0/B^-$ and $Λ_b^0/B^-$ ratios measured in $pp$ collisions at the LHC is obtained. Finally, we implement the hadro-chemistry 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 hadro-chemistry and collective behavior of $b$ hadrons in Pb-Pb collisions at the LHC.
