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Coherent Photoproduction of Low- p T Charmonium in Peripheral Heavy Ion Collisions 外周重离子碰撞中低p态T离子的相干光产生
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-05-14 DOI: 10.1155/2022/1561632
Gongming Yu, Yanbing Cai, Yongping Fu, Haitao Yang, Q. Gao, Q. Hu, Liyuan Hu, W. Li, Yushou Song
We calculate the centrality dependence for coherent photoproduction of very low- pT J/ψ at Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) energies within the impact parameter-dependent saturated color dipole model. By using the large equivalent photon fluxes, we present the differential cross-section of very low- pT J/ψ produced by coherent photonuclear in peripheral heavy ion collisions. The numerical results demonstrate that our calculation agrees with J/ψ data in peripheral heavy ion collisions at Relativistic Heavy Ion Collider (RHIC) energies.
我们计算了极低p tj / ψ的相干光产生的中心性依赖关系相对论重离子对撞机(RHIC)和大型强子对撞机(LHC)的能量在影响参数相关的饱和彩色偶极子模型中。利用大的等效光子通量,给出了由。产生的极低压强tj / ψ的微分截面外围重离子碰撞中的相干光子核。数值结果表明,我们的计算结果与相对论重离子对撞机(RHIC)能量下外围重离子碰撞的J / ψ数据一致。
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引用次数: 1
Studying Same-Sign Top Pair Production through Top-Higgs FCNC Interactions at the HL-LHC 从HL-LHC的顶部Higgs-FCNC相互作用研究同符号顶部对的产生
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-05-09 DOI: 10.1155/2022/4299254
O. M. Ozsimsek, V. Ari, O. University, A. University
We investigate the potential of the HL-LHC for discovering new physics effects via the same-sign top pair signatures. We focus on the semileptonic (electron and muon) decay of the top quarks and study the reach for a simplified model approach where top quark flavor changing could occur through a neutral scalar exchange. A relatively smaller background contribution and clean signature are the advantages of the leptonic decay mode of the same-sign W bosons in the same-sign production processes of top quark pairs. Assuming the FCNC between top quark, up-type quark, and scalar boson from the new physics interactions, the branchings could be excluded of the order O 1 0 − 4 . We use angular observables of the same-sign lepton pairs and the top quark kinematics in the process which provide the possibility of separation of new physics signal from the SM backgrounds using machine-learning techniques. We find that the same-sign top quark pair production is quite capable of testing the top-Higgs FCNCs at the HL-LHC.
我们研究了HL-LHC通过相同的正负号对特征发现新物理效应的潜力。我们专注于顶夸克的半轻子(电子和μ子)衰变,并研究了简化模型方法的范围,其中顶夸克的风味变化可以通过中性标量交换发生。在顶夸克对的相同符号产生过程中,相同符号W玻色子的轻子衰变模式具有相对较小的背景贡献和干净的特征。假设在新的物理相互作用中,顶夸克、上型夸克和标量玻色子之间存在FCNC,则可以排除O 1 0−4阶的分支。我们在这个过程中使用了相同符号轻子对的角可观测性和顶夸克运动学,这提供了使用机器学习技术从SM背景中分离新物理信号的可能性。我们发现,相同符号的顶夸克对产生完全有能力在HL-LHC测试顶部希格斯FCNC。
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引用次数: 1
An Effective Model for Glueballs and Dual Superconductivity at Finite Temperature 有限温度下胶球和双超导性的有效模型
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-05-03 DOI: 10.1155/2021/5658568
A. Issifu, F. A. Brito
<jats:p>The glueballs lead to gluon and QCD monopole condensations as by-products of color confinement. A color dielectric function <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <mi>G</mi> <mfenced open="(" close=")"> <mrow> <mo>∣</mo> <mi>ϕ</mi> <mo>∣</mo> </mrow> </mfenced> </math> </jats:inline-formula> coupled with a Abelian gauge field is properly defined to mediate the glueball interactions at confining regime after spontaneous symmetry breaking (SSB) of the gauge symmetry. The particles are expected to form through the quark-gluon plasma (QGP) hadronization phase where the free quarks and gluons start clamping together to form hadrons. The QCD-like vacuum <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <mfenced open="〈" close="〉"> <mrow> <msup> <mrow> <mi>η</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msup> <msubsup> <mrow> <mi>m</mi> </mrow> <mrow> <mi>η</mi> </mrow> <mrow> <mn>2</mn> </mrow> </msubsup> <msup> <mrow> <mi>F</mi> </mrow> <mrow> <mi>μ</mi> <mi>ν</mi> </mrow> </msup> <msub> <mrow> <mi>F</mi> </mrow> <mrow> <mi>μ</mi> <mi>ν</mi> </mrow> </msub> </mrow> </mfenced> </math> </jats:inline-formula>, confining potential <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3">
胶球导致胶子和QCD单极子凝聚,作为颜色限制的副产品。适当定义了与阿贝尔规范场耦合的彩色介电函数GŞ规范对称性自发对称性破缺(SSB)后约束区的相互作用。粒子预计将通过夸克-胶子等离子体(QGP)强子化阶段形成,在该阶段,自由夸克和胶子开始夹紧在一起形成强子。类QCD真空η2mη2Fμμ,限制电位V c r,管柱张力σ,穿透深度λ,超导和正常单极子密度(ns  n),和有效群众(mη2和m A2)将在有限温度下进行研究T我们还计算了强“运行”耦合αs,以及随后的QCDβ函数。基于单极子凝聚,将研究QCD真空的双超导性质。
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引用次数: 3
Initial- and Final-State Temperatures of Emission Source from Differential Cross-Section in Squared Momentum Transfer in High-Energy Collisions 高能碰撞中平方动量传递微分截面发射源的初态和终态温度
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-29 DOI: 10.1155/2021/6677885
Qi Wang, Fu-Hu Liu, K. Olimov
<jats:p>The differential cross-section in squared momentum transfer of <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1"> <mi>ρ</mi> </math> </jats:inline-formula>, <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2"> <msup> <mrow> <mi>ρ</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msup> </math> </jats:inline-formula>, <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3"> <mi>ω</mi> </math> </jats:inline-formula>, <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M4"> <mi>ϕ</mi> </math> </jats:inline-formula>, <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M5"> <msub> <mrow> <mi>f</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msub> <mfenced open="(" close=")"> <mrow> <mn>980</mn> </mrow> </mfenced> </math> </jats:inline-formula>, <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M6"> <msub> <mrow> <mi>f</mi> </mrow> <mrow> <mn>1</mn> </mrow> </msub> <mfenced open="(" close=")"> <mrow> <mn>1285</mn> </mrow> </mfenced> </math> </jats:inline-formula>, <jats:inline-formula> <math xmlns="http://www.w3.org/1998/Math/MathML" id="M7"> <msub> <mrow> <mi>f</mi> </mrow> <mrow> <mn>0</mn> </mrow> </msub> <mfenced open="(" close=")"> <mrow> <mn>1370</mn>
ρ,ρ0、ω,ξ,f 0 980,f 1 1285,f 0 1370,f 1 1420,f 0 1500,和高能虚光子质子中产生的J/ψ(γ*p),通过蒙特卡罗计算分析了H1、ZEUS和WA102合作测量的光子-质子(γp)和质子-质子(p p)碰撞。在计算中,Erlang分布、Tsallis分布和Hagedorn函数分别用于描述发射粒子的横向动量谱。我们的结果表明,初始态和最终态温度从较低的光子虚度平方增加到较高的虚度平方,并随着质心能量的增加而降低。
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引用次数: 4
Transverse Momentum and Pseudorapidity Spectrum of the Top Quark, Lepton, and b Jet in Proton-Proton Collisions at LHC 大型强子对撞机中顶夸克、轻子和b射流的横向动量和赝快度谱
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-23 DOI: 10.1155/2021/6660669
Li-Na Gao, E. Wang
We study the transverse momentum and pseudorapidity spectrum of the top quark and their decay products, the system, and the total number of jets in proton-proton (pp) collisions at 13 TeV by using the Tsallis-Pareto-type function and the three-source Landau hydrodynamic model, respectively. The related parameters, such as the effective temperature of the interacting system ( ), the nonextensivity of the process ( ), and the width ( ) of pseudorapidity distribution, are extracted.
利用tsallis - pareto型函数和三源Landau流体动力学模型,分别研究了13tev质子-质子碰撞中顶夸克及其衰变产物的横动量和伪快度谱、体系和总喷流数。提取了相互作用系统的有效温度()、过程的非广泛性()和伪快度分布的宽度()等相关参数。
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引用次数: 3
Cosmic Consequences of Kaniadakis and Generalized Tsallis Holographic Dark Energy Models in the Fractal Universe 分形宇宙中Kaniadakis和广义Tsallis全息暗能量模型的宇宙后果
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-20 DOI: 10.1155/2021/5519028
A. Jawad, A. M. Sultan
We investigate the recently proposed holographic dark energy models with the apparent horizon as the IR cutoff by assuming Kaniadakis and generalized Tsallis entropies in the fractal universe. The implications of these models are discussed for both the interacting (Γ = 3Hbρm) and noninteracting (b2 = 0) cases through different cosmological parameters. Accelerated expansion of the universe is justified for both models through deceleration parameter q. In this way, the equation of state parameter ωd describes the phantom and quintessence phases of the universe. However, the coincidence parameter ~r =Ωm/Ωd shows the dark energyand dark matter-dominated eras for different values of parameters. It is also mentioned here that the squared speed of sound gives the stability of the model except for the interacting case of the generalized Tsallis holographic dark energy model. It is mentioned here that the current dark energy models at the apparent horizon give consistent results with recent observations.
我们通过假设分形宇宙中的Kaniadakis和广义Tsallis熵,研究了最近提出的以视视界为红外截止点的全息暗能量模型。通过不同的宇宙学参数,讨论了这些模型对相互作用(Γ=3Hbρm)和非相互作用(b2=0)情况的影响。通过减速参数q,两个模型都证明了宇宙的加速膨胀是合理的。这样,状态方程参数ωd描述了宇宙的幻影和精髓阶段。然而,重合参数~r=Ωm/Ωd显示了不同参数值下暗能量和暗物质主导的时代。这里还提到,除了广义Tsallis全息暗能量模型的相互作用情况外,声速的平方给出了模型的稳定性。这里提到,目前在视视界的暗能量模型给出了与最近观测结果一致的结果。
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引用次数: 19
Expression of Concern on “Antigravity, an Answer to Nature’s Phenomena including the Expansion of the Universe” “反重力——对包括宇宙膨胀在内的自然现象的回答”关注表达
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-17 DOI: 10.1155/2021/9380814
Advances in
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引用次数: 0
Feasibility Study of an Alcohol-Based Liquid Scintillation Detector and Its Application 醇基液体闪烁探测器的可行性研究及其应用
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-16 DOI: 10.1155/2021/6672655
B. Kim, J. Choi, K. Joo, Seon Yeong Park, Ye Sung Song, H. J. Woo
This paper proposes a new base material, a mixture of alcohol and water, for liquid scintillators. A possibility of using alcohol as a new detection solution in a particle detector is described. A liquid scintillator is widely used in various fields because of its high light yield. In addition, it is very important to develop a stable liquid scintillator for particle detectors or other medical applications. To date, there have been no previous R&D studies elsewhere for the use of alcohol in particle detectors, and no market products are available of this type. Thus, there is a room for improvement. This paper describes the brief synthesizing process of the alcohol-based liquid scintillator by varying the mixing ratio of each component that makes up the liquid scintillator. The several feasible physical and optical properties of an alcohol-based liquid scintillator were investigated and presented. Finally, as one of its applications, a range (beam-path length) measurement using an electron beam in medical physics is introduced after irradiating an alcohol-based liquid scintillator with electron beam energies of 6~12 MeV. The measurement results were compared with a Monte Carlo simulation, Novalis Tx, a phantom, and a CT image. In the near future, the new alcohol-based liquid scintillator could be used for particle detector or medical imaging applications.
本文提出了一种新型的液体闪烁体基材——酒精和水的混合物。描述了在粒子检测器中使用酒精作为一种新的检测溶液的可能性。液体闪烁体因其高产光率而广泛应用于各个领域。此外,开发一种稳定的液体闪烁体对于粒子探测器或其他医学应用非常重要。迄今为止,在其他地方没有进行过关于在粒子探测器中使用酒精的研发研究,市场上也没有这类产品。因此,还有改进的余地。本文介绍了通过改变组成液体闪烁体的各组分的混合比例,合成醇基液体闪烁体的简要过程。研究了醇基液体闪烁体的几种可行的物理和光学性质。最后,作为其应用之一,介绍了以6~12 MeV的电子束能量照射酒精基液体闪烁体后,利用电子束测量医学物理中的范围(光束路径长度)。测量结果与Monte Carlo模拟、Novalis Tx、幻像和CT图像进行了比较。在不久的将来,新型醇基液体闪烁体可用于粒子探测器或医学成像应用。
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引用次数: 3
On the Electromagnetic Vacuum Origins of Dark Energy, Dark Matter, and Astrophysical Jets 关于暗能量、暗物质和天体物理喷流的电磁真空起源
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-12 DOI: 10.1155/2021/5588662
S. Marongwe
We use a semiclassical version of the Nexus paradigm of quantum gravity in which the quantum vacuum at large scales is dominated by the second quantized electromagnetic field to demonstrate that a virtual photon field can affect the geometric evolution of Einstein manifolds or Ricci solitons. This phenomenon offers a cogent explanation of the origins of astrophysical jets, the cosmological constant, and a means of detecting galactic dark matter.
我们使用量子引力的Nexus范式的半经典版本,其中大尺度的量子真空由第二量子化电磁场主导,以证明虚拟光子场可以影响爱因斯坦流形或里奇孤子的几何演化。这一现象为天体物理喷流、宇宙常数的起源提供了令人信服的解释,也是探测星系暗物质的一种手段。
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引用次数: 0
Bound State Solution Schrödinger Equation for Extended Cornell Potential at Finite Temperature 有限温度下扩展Cornell势的束缚态解Schrödinger方程
IF 1.7 4区 物理与天体物理 Q3 PHYSICS, PARTICLES & FIELDS Pub Date : 2021-04-09 DOI: 10.1155/2021/1861946
A. Ahmadov, K. H. Abasova, M. Orucova
In this paper, we study the finite temperature-dependent Schrödinger equation by using the Nikiforov-Uvarov method. We consider the sum of the Cornell, inverse quadratic, and harmonic-type potentials as the potential part of the radial Schrödinger equation. Analytical expressions for the energy eigenvalues and the radial wave function are presented. Application of the results for the heavy quarkonia and B c meson masses are in good agreement with the current experimental data except for zero angular momentum quantum numbers. Numerical results for the temperature dependence indicates a different behaviour for different quantum numbers. Temperature-dependent results are in agreement with some QCD sum rule results from the ground states.
本文采用Nikiforov-Uvarov方法研究了有限温度相关Schrödinger方程。我们考虑康奈尔势、逆二次势和谐波型势的总和作为径向Schrödinger方程的势部分。给出了能量特征值和径向波函数的解析表达式。对重夸子和bc介子质量的应用结果除角动量量子数为零外,与现有实验数据基本一致。温度依赖性的数值结果表明,不同的量子数有不同的行为。温度相关的结果与基态的一些QCD求和规则结果一致。
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引用次数: 9
期刊
Advances in High Energy Physics
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