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Chiral phase structure and critical end point in QCD QCD中的手性相结构和临界端点
Pub Date : 2020-10-26 DOI: 10.1016/j.physletb.2021.136584
F. Gao, J. Pawlowski
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引用次数: 41
Sensitivities of future reactor and long-baseline neutrino experiments to NSI 未来反应堆和长基线中微子实验对NSI的敏感性
Pub Date : 2020-10-24 DOI: 10.1103/PHYSREVD.103.075003
P. Bakhti, M. Rajaee
We investigate the potential of the next generation long-baseline neutrino experiments DUNE and T2HK as well as the upcoming reactor experiment JUNO to constrain Non-Standard Interaction (NSI) parameters. JUNO is going to provide the most precise measurements of solar neutrino oscillation parameters as well as determining the neutrino mass ordering. We study how the results of JUNO combined with those of long-baseline neutrino experiments such as DUNE and T2HK can help to determine oscillation parameters and to constrain NSI parameters. We present excluded regions in NSI parameter space, $epsilon_{alpha beta}$ assuming Standard Model (SM) as the null hypothesis. We further explore the correlations between the NSI parameters and CP-violation phase.
我们研究了下一代长基线中微子实验DUNE和T2HK以及即将到来的反应堆实验JUNO在约束非标准相互作用(NSI)参数方面的潜力。朱诺将提供太阳中微子振荡参数的最精确测量,并确定中微子的质量顺序。我们研究JUNO的结果如何与DUNE和T2HK等长基线中微子实验结果相结合,以帮助确定振荡参数和约束NSI参数。我们在NSI参数空间中提出排除区域,$epsilon_{alpha beta}$假设标准模型(SM)为零假设。我们进一步探讨了NSI参数与cp违背相位之间的关系。
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引用次数: 8
Transverse structure of electron in momentum space in basis light-front quantization 基光前量子化中动量空间中电子的横向结构
Pub Date : 2020-10-23 DOI: 10.1103/PHYSREVD.103.036005
Zhi Hu, Siqi Xu, C. Mondal, Xingbo Zhao, J. Vary
We investigate the leading-twist transverse momentum-dependent distribution functions (TMDs) for a physical electron, a spin-1/2 composite system consisting of a bare electron and a photon, using the Basis Light-front Quantization (BLFQ) framework. The light-front wave functions of the physical electron are obtained from the eigenvectors of the light-front QED Hamiltonian. We evaluate the TMDs using the overlaps of the light-front wave functions. The BLFQ results are found to be in excellent agreement with those TMDs calculated using lowest-order perturbation theory.
利用基光前量化(BLFQ)框架,研究了物理电子(由裸电子和光子组成的自旋1/2复合系统)的前导扭转横向动量相关分布函数(TMDs)。物理电子的光前波函数由光前QED哈密顿量的特征向量得到。我们使用光前波函数的重叠来评估tmd。发现BLFQ的结果与用最低阶摄动理论计算的tmd非常吻合。
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引用次数: 8
O(αsv2) corrections to the hadronic decay of vector quarkonia 向量夸克子强子衰变的O(αsv2)修正
Pub Date : 2020-10-22 DOI: 10.1103/physrevd.102.094021
Wen-Long Sang, F. Feng, Yu Jia
Within the nonrelativistic QCD (NRQCD) factorization framework, we compute the ${mathcal O}(alpha_s v^2)$ corrections to the hadronic decay rate of vector quarkonia, exemplified by $J/psi$ and $Upsilon$. Setting both the renormalization and NRQCD factorization scales to be $m_Q$, we obtain $Gamma(J/psito {rm LH})= 0.0716frac{alpha_s^3}{m_c^2} langle mathcal{O}_1({}^3S_1)rangle_{J/psi} [1-1.19alpha_s+(-5.32+3.03alpha_s)langle v^2rangle_{J/psi}]$ and $Gamma(Upsilonto {rm LH})= 0.0716frac{alpha_s^3}{m_b^2}langlemathcal{O}_1({}^3S_1)rangle_{Upsilon}[1-1.56alpha_s+(-5.32+4.61alpha_s)langle v^2rangle_{Upsilon}]$. We confirm the previous calculation of $mathcal{O}(alpha_s)$ corrections on a diagram-by-diagram basis, with the accuracy significantly improved. For $J/psi$ hadronic decay, we find that the ${mathcal O}(alpha_sv^2)$ corrections are moderate and positive, nevertheless unable to counterbalance the huge negative corrections. On the other hand, the effect of ${mathcal O}(alpha_sv^2)$ corrections for $Upsilon(nS)$ is sensitive to the $mathcal{O}(v^2)$ NRQCD matrix elements. With the appropriate choice of the NRQCD matrix elements, our theoretical predictions for the decay rates may be consistent with the experimental data for $Upsilon(1S,2S)to {rm LH}$. As a byproduct, we also present the theoretical predictions for the branching ratio of $J/psi(Upsilon)to 3gamma$ accurate up to $mathcal{O}(alpha_s v^2)$.
在非相对论QCD (NRQCD)分解框架中,我们计算了${mathcal O}(alpha_s v^2)$对矢量夸克子的强子衰变率的修正,以$J/psi$和$Upsilon$为例。将重整化和NRQCD分解尺度设为$m_Q$,得到$Gamma(J/psito {rm LH})= 0.0716frac{alpha_s^3}{m_c^2} langle mathcal{O}_1({}^3S_1)rangle_{J/psi} [1-1.19alpha_s+(-5.32+3.03alpha_s)langle v^2rangle_{J/psi}]$和$Gamma(Upsilonto {rm LH})= 0.0716frac{alpha_s^3}{m_b^2}langlemathcal{O}_1({}^3S_1)rangle_{Upsilon}[1-1.56alpha_s+(-5.32+4.61alpha_s)langle v^2rangle_{Upsilon}]$。我们在逐图的基础上确认了之前的$mathcal{O}(alpha_s)$修正计算,精度显著提高。对于$J/psi$强子衰变,我们发现${mathcal O}(alpha_sv^2)$修正是温和的和正的,但无法抵消巨大的负修正。另一方面,${mathcal O}(alpha_sv^2)$对$Upsilon(nS)$的修正效应对$mathcal{O}(v^2)$ NRQCD矩阵元素很敏感。通过适当选择NRQCD矩阵元素,我们对衰减率的理论预测可能与$Upsilon(1S,2S)to {rm LH}$的实验数据一致。作为副产品,我们还提出了对$J/psi(Upsilon)to 3gamma$分支比的理论预测,精确到$mathcal{O}(alpha_s v^2)$。
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引用次数: 2
Exploring the Universe with dark light scalars 用暗光标量探索宇宙
Pub Date : 2020-10-21 DOI: 10.1103/PHYSREVD.103.083528
Bugeon Jo, HyeonTae Kim, Hyungdo Kim, C. Shin
We study the cosmology of a dark sector consisting of (ultra) light scalars. Since the scalar mass is radiatively unstable, a special explanation is required to make it much smaller than the UV scale. There are two well-known mechanisms for the origin of scalar mass. The scalar can be identified as a pseudo-Goldstone boson, whose shift symmetry is explicitly broken by non-perturbative corrections, like the axion. Alternatively, it can be identified as a composite particle like the glueball, whose mass is limited by the confinement scale of the theory. In both cases, the scalar can be naturally light, but interaction behavior is quite different. The lighter the axion (glueball) mass is, the weaker (stronger) the interaction strength is. We consider the dark axion whose shift symmetry is anomalously broken by the hidden non-abelian gauge symmetry. After the confinement of the gauge group, the dark axion and the dark glueball get masses and both form multicomponent dark matter. We carefully consider the effects of energy flow from the dark gluons to the dark axions and derive the full equations of motion for the background and the perturbed variables. The effect of the dark axion-dark gluon coupling on the evolution of the entropy and the isocurvature perturbations is also clarified. Finally, we discuss the gravo-thermal collapse of the glueball subcomponent dark matter after the halos form, in order to explore the potential to contribute to the formation of seeds for the supermassive black holes observed at high redshifts. With simplified assumptions, the glueball subcomponent dark matter with the mass of $sim 0.01-1{rm MeV}$, and the axion dark matter with the GUT scale decay constant (the mass of ${cal O}(10^{-18}),{rm eV}$) can provide the hint on the origin of the supermassive black holes at high redshifts.
我们研究了由(超)光标量组成的暗扇区的宇宙学。由于标量质量在辐射上是不稳定的,要使它比紫外线尺度小得多,就需要一个特殊的解释。关于标量质量的起源,有两种众所周知的机制。标量可以被识别为伪戈德斯通玻色子,其移位对称性被非微扰修正明确地打破,就像轴子一样。或者,它可以被识别为像胶球一样的复合粒子,其质量受到理论约束尺度的限制。在这两种情况下,标量都可以是自然轻的,但是相互作用的行为是完全不同的。轴子(胶球)质量越轻,相互作用强度越弱(越强)。考虑平移对称被隐非阿贝尔规范对称异常破缺的暗轴子。在规范群约束后,暗轴子和暗胶球获得质量,形成多组分暗物质。我们仔细考虑了能量从暗胶子流向暗轴子的影响,并推导了背景和扰动变量的完整运动方程。阐明了暗轴子-暗胶子耦合对熵演化和等曲率扰动的影响。最后,我们讨论了在光晕形成后胶球子成分暗物质的引力-热坍缩,以探索在高红移观测到的超大质量黑洞种子形成的潜力。通过简化假设,质量为$sim 0.01-1{rm MeV}$的胶球子成分暗物质和具有GUT尺度衰变常数(质量为${cal O}(10^{-18}),{rm eV}$)的轴子暗物质可以提供关于高红移超大质量黑洞起源的线索。
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引用次数: 16
3-D structure of the Glasma initial state: Breaking boost-invariance by collisions of extended shock waves in classical Yang-Mills theory 等离子体初始态的三维结构:经典杨-米尔斯理论中扩展激波碰撞打破助推不变性
Pub Date : 2020-10-21 DOI: 10.1103/physrevd.103.014003
Soeren Schlichting, Pragya Singh
We simulate the 3+1 D classical Yang-Mills dynamics of the collisions of longitudinally extended nuclei, described by eikonal color charges in the Color Glass Condensate framework. By varying the longitudinal thickness of the colliding nuclei, we discuss the violations of boost invariance and explore how the boost invariant high-energy limit is approached. Subsequently, we develop a more realistic model of the three dimensional color charge distributions that connects longitudinal and transverse fluctuations to the $x$ and $k_T$ dependence of transverse momentum dependent parton distributions, and explore the resulting rapidity profiles and their longitudinal fluctuations.
我们模拟了纵向扩展核碰撞的3+1维经典Yang-Mills动力学,用彩色玻璃凝聚框架中的双角色荷来描述。通过改变碰撞核的纵向厚度,我们讨论了助推不变性的违反,并探讨了如何逼近助推不变性的高能极限。随后,我们建立了一个更真实的三维色荷分布模型,将纵向和横向波动与横向动量依赖的部分子分布的x和k_T依赖联系起来,并探讨了由此产生的速度分布及其纵向波动。
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引用次数: 4
Effects of hadronic repulsive interactions on the fluctuations of conserved charges 强子斥力相互作用对守恒电荷波动的影响
Pub Date : 2020-10-21 DOI: 10.1103/PHYSREVD.103.054015
Somenath Pal, G. Kadam, H. Mishra, A. Bhattacharyya
We investigate the effects of repulsive interaction between hadrons on the fluctuations of the conserved charges. We calculate the baryon,the electric charge and the strangeness susceptibilities within the ambit of hadron resonance gas model extended to include the short range repulsive interactions.The repulsive interactions are included through a mean-field approach where the single particle energy gets modified due to mean field interactions between hadrons proportional to the number density of hadrons.We assume different mean-field interactions for mesons and baryons. It is shown that the repulsive interactions play a very crucial role to describe hadronic matter near transition temperature. We also show that in order to consistently describe higher order conserved charge fluctuations mesonic repulsive interactions cannot be neglected. Further, we demonstrate that the repulsive interaction of baryons are essential to describe the lattice simulation results at finite baryonchemical potential for higher order fluctuations.
我们研究了强子间的排斥相互作用对守恒电荷波动的影响。我们计算了在强子共振气体模型扩展到包括短程排斥作用范围内的重子、电荷和奇异磁化率。排斥相互作用通过平均场方法包括,其中单个粒子能量由于与强子数量密度成比例的强子之间的平均场相互作用而得到修正。我们假设介子和重子的平均场相互作用不同。结果表明,排斥性相互作用对描述跃迁温度附近的强子物质起着至关重要的作用。我们还表明,为了一致地描述高阶守恒电荷波动,介子排斥相互作用不能被忽略。此外,我们证明了重子的排斥相互作用对于描述高阶波动的有限重子化学势的晶格模拟结果是必不可少的。
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引用次数: 2
The study of exotic state $$Z_c^{pm }(3900)$$ decaying to $$J/psi pi ^{pm }$$ in the pp collisions at $$sqrt{s}$$ = 1.96, 7, and 13 TeV 在$$sqrt{s}$$ = 1.96、7和13 TeV的pp碰撞中,奇异态$$Z_c^{pm }(3900)$$衰变成$$J/psi pi ^{pm }$$的研究
Pub Date : 2020-10-20 DOI: 10.1140/EPJC/S10052-021-08983-3
Zhen Zhang, Liang Zheng, Gang Chen, Hong-ge Xu, D. Zhou, Yu-Liang Yan, B. Sa
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引用次数: 3
Signatures of α-clustering in O16 by using a multiphase transport model 基于多相输运模型的O16中α-聚类特征
Pub Date : 2020-10-20 DOI: 10.1103/PhysRevC.102.054907
Yi-An Li, Song Zhang, Yugang Ma
$alpha$-clustered structures in light nuclei could be studied through "snapshots" taken by relativistic heavy-ion collisions. A multiphase transport (AMPT) model is employed to simulate the initial structure of collision nuclei and the proceeding collisions at center of mass energy $sqrt{s_{NN}}$ = 6.37 TeV. This initial structure can finally be reflected in the subsequent observations, such as elliptic flow ($v_{2}$), triangular flow ($v_{3}$) and quadrangular flow ($v_4$). Three sets of the collision systems are chosen to illustrate system scan is a good way to identify the exotic $alpha$-clustered nuclear structure, case I: $mathrm{^{16}O}$ nucleus (with or without $alpha$-cluster) + ordinary nuclei (always in Woods-Saxon distribution) in most central collisions, case II: $mathrm{^{16}O}$ nucleus (with or without $alpha$-cluster) + $mathrm{^{197}Au}$ nucleus collisions for centrality dependence, and case III: symmetric collision systems (namely, $^{10}$B + $^{10}$B, $^{12}$C + $^{12}$C, $^{16}$O + $^{16}$O (with or without $alpha$-cluster), $^{20}$Ne + $^{20}$Ne, and $^{40}$Ca + $^{40}$Ca) in most central collisions. Our calculations propose that relativistic heavy-ion collision experiments at $sqrt{s_{NN}}$ = 6.37 TeV are promised to distinguish the tetrahedron structure of $mathrm{^{16}O}$ from the Woods-Saxon one and shed lights on the system scan projects in experiments.
$alpha$可以通过相对论性重离子碰撞拍摄的“快照”来研究轻核中的簇状结构。采用多相输运(AMPT)模型模拟了碰撞核的初始结构和在质能中心$sqrt{s_{NN}}$ = 6.37 TeV处的后续碰撞。这种初始结构最终可以在后续的观测中体现出来,如椭圆流($v_{2}$)、三角形流($v_{3}$)和四边形流($v_4$)。选择三组碰撞系统来说明系统扫描是识别奇异的$alpha$ -聚类核结构的好方法,情况I:在大多数中心碰撞中$mathrm{^{16}O}$核(有或没有$alpha$ -聚类)+普通核(总是在Woods-Saxon分布中),情况II: $mathrm{^{16}O}$核(有或没有$alpha$ -聚类)+ $mathrm{^{197}Au}$核碰撞中心依赖性,情况III:对称碰撞系统(即$^{10}$ B + $^{10}$ B, $^{12}$ C + $^{12}$ C, $^{16}$ O + $^{16}$ O(有或没有$alpha$ -cluster), $^{20}$ Ne + $^{20}$ Ne和$^{40}$ Ca + $^{40}$ Ca)在大多数中心碰撞中。我们的计算表明,$sqrt{s_{NN}}$ = 6.37 TeV的相对论重离子碰撞实验有望将$mathrm{^{16}O}$的四面体结构与Woods-Saxon结构区分开来,并为实验中的系统扫描项目提供了启示。
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引用次数: 6
Sterile neutrino searches at tagged kaon beams 无菌中微子搜索标记的介子束
Pub Date : 2020-10-20 DOI: 10.1103/PHYSREVD.103.035018
Luis A. Delgadillo, P. Huber
Tagged kaon beams are attractive neutrino sources, which would provide flavor pure $nu_e$-beams with exactly measured normalization. We point out that this also leads to an anti-tagged flavor pure $nu_mu$-beam, with equally well known normalization. Exposing a 1 kt liquid argon detector at a baseline of 1 km to this combination of unique beams allows to decisively test recent indications by IceCube and Neutrino-4 of sterile neutrino oscillations in the multi-eV range.
标记的介子束是有吸引力的中微子源,它将提供具有精确测量归一化的风味纯$nu_e$ -束。我们指出,这也导致了反标记风味纯$nu_mu$ -束,具有同样众所周知的规范化。在1公里的基线上,将1 kt的液态氩探测器暴露在这种独特的光束组合中,可以果断地测试冰立方和中微子4最近指出的多ev范围内的无菌中微子振荡。
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引用次数: 4
期刊
arXiv: High Energy Physics - Phenomenology
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