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New signature of low mass Z′ in J/ψ decays* * Supported in part by the National Key Research and Development Program of China under (2020YFC2201501) and the National Natural Science Foundation of China (NSFC) (12347103, 12205063) 低质量Z′在J/ψ衰变中的新特征* * 国家重点研发计划(2020YFC2201501)和国家自然科学基金(12347103,12205063)的部分资助
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad53b6
Chao-Qiang Geng, Chia-Wei Liu, Jiabao Zhang
We explored a new approach to search for a low-mass particle through decays by identifying its existence through parity-violating phenomena in the isospin-violating final states of and the corresponding charge conjugated states of . Our investigation centered on a generation-independent and leptophobic with mass below 10 GeV. Given the present experimental conditions at Beijing Spectrometer III (BESIII) and the anticipated opportunities at the Super Tau Charm Factory (STCF), we conducted Monte-Carlo simulations to predict possible events at both facilities. Notably, we foresee a substantial enhancement in the precision of the lower limit estimation of as well as a reduction in statistical uncertainty with upcoming STCF experiments. Furthermore, it is essential to highlight that a null result in the measurement of would impose stringent constraints, requiring the couplings to be in the order of .
我们探索了一种通过衰变寻找低质量粒子的新方法,即通过等空间违反最终态的奇偶性现象和相应的电荷共轭态的奇偶性现象来确定它的存在。 我们的研究集中在质量低于10 GeV的不依赖于世代的和轻微的粒子上。考虑到北京谱仪三期(BESIII)目前的实验条件和超级头符厂(STCF)的预期机会,我们进行了蒙特卡洛模拟,以预测这两个设施可能发生的事件。值得注意的是,我们预计即将进行的 STCF 实验将大大提高下限估计的精度,并减少统计不确定性。此外,有必要强调的是,如果测量结果为空,将会带来严格的限制,要求耦合在......的数量级。
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引用次数: 0
Invisible and semi-invisible decays of bottom baryons* * The work is partly Supported by the National Key Research and Development Program of China (2020YFA0406400, 2023YFA1606000), and the National Natural Science Foundation of China (12335003, 12275277) 底重子的隐形和半隐形衰变* * 本研究得到国家重点研发计划(2020YFA0406400,2023YFA1606000)和国家自然科学基金(12335003,12275277)的部分资助。
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad4afa
Yong Zheng, Jian-Nan Ding, Dong-Hao Li, Lei-Yi Li, Cai-Dian Lü, Fu-Sheng Yu
The similar densities of dark matter and baryons in the universe imply that they may arise from the same ultraviolet model. B-Mesogenesis, which assumes dark matter is charged under the baryon number, attempts to simultaneously explain the origin of baryon asymmetry and dark matter in the universe. In particular, B-Mesogenesis may induce bottom-baryon decays into invisible or semi-invisible final states, which provide a distinctive signal for probing this scenario. In this work, we systematically study the invisible decays of bottom baryons into dark matter and the semi-invisible decays of bottom baryons into a meson or a photon together with a dark matter particle. In particular, the fully invisible decay can reveal the stable particles in B-Mesogenesis. Some QCD-based frameworks are used to calculate the hadronic matrix elements under the B-Mesogenesis model. We estimate the constraints on the Wilson coefficients or the product of some new physics couplings with the Wilson coefficients according to the semi-invisible and invisible decays of bottom baryons detectable at future colliders.
宇宙中暗物质和重子的密度相似,这意味着它们可能产生于同一个紫外线模型。B-Mesogenesis 假设暗物质在重子数下带电,试图同时解释宇宙中重子不对称和暗物质的起源。特别是,B-介子发生可能诱导底重子衰变为不可见或半不可见的终态,这为探测这种情况提供了一个独特的信号。在这项工作中,我们系统地研究了底重子向暗物质的不可见衰变,以及底重子与暗物质粒子一起向介子或光子的半不可见衰变。特别是完全不可见衰变可以揭示B-介子发生过程中的稳定粒子。一些基于 QCD 的框架被用来计算 B-Mesogenesis 模型下的强子矩阵元素。我们根据在未来对撞机上可探测到的底重子的半隐形和隐形衰变来估计威尔逊系数的约束或一些新物理耦合与威尔逊系数的乘积。
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引用次数: 0
Spatial covariant gravity with two degrees of freedom in the presence of an auxiliary scalar field: Perturbation analysis* * Supported by the Natural Science Foundation of China (11975020) 存在辅助标量场的双自由度空间协变引力:扰动分析* * 国家自然科学基金资助项目(11975020)
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad47a9
Zhi-Chao Wang, Xian Gao
We investigate a class of gravity theories respecting only spatial covariance, termed spatially covariant gravity, in the presence of an auxiliary scalar field. We examine the conditions on the Lagrangian required to eliminate scalar degrees of freedom, allowing only two tensorial degrees of freedom to propagate. Instead of strict constraint analysis, in this paper, we employ the perturbation method and focus on the necessary conditions to evade the scalar mode at the linear order in perturbations around a cosmological background. Beginning with a general action and solving the auxiliary perturbation variables in terms of a would-be dynamical scalar mode, we derive the condition to remove its kinetic term, thus ensuring that no scalar mode propagates. As an application of the general condition, we study a polynomial-type Lagrangian as a concrete example, in which all monomials are spatially covariant scalars containing two derivatives. We find that the auxiliary scalar field is essential, and new terms in the Lagrangian are allowed. Our analysis provides insights into constructing gravity theories with two degrees of freedom in the extended framework of spatially covariant gravity.
我们研究了一类在存在辅助标量场的情况下只尊重空间协变的引力理论,称为空间协变引力。我们研究了消除标量自由度所需的拉格朗日条件,只允许两个张量自由度传播。本文没有采用严格的约束分析,而是采用了扰动方法,重点研究在宇宙学背景周围的扰动中规避线性阶标量模式的必要条件。我们从一般作用开始,用可能的动力学标量模式求解辅助扰动变量,推导出去除其动力学项的条件,从而确保没有标量模式传播。作为一般条件的应用,我们以多项式型拉格朗日为具体例子进行了研究,其中所有单项式都是包含两个导数的空间协变标量。我们发现,辅助标量场是必不可少的,拉格朗日中的新项也是允许的。我们的分析为在空间协变引力的扩展框架内构建具有两个自由度的引力理论提供了启示。
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引用次数: 0
Féeton (B-L gauge boson) dark matter for the 511-keV gamma-ray excess and the prediction of low-energy neutrino flux* * Supported by the Talent Scientific Start-Up Project of China, the Natural Science Foundation of China (12175134, 12375101, 12090060, 12090064, 12247141), the SJTU Double First Class start-up fund(WF220442604), and the World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan 511-keV伽马射线过量的费顿(B-L规玻色子)暗物质与低能中微子通量预测* * 国家 "千人计划 "人才科学启动项目、国家自然科学基金(12175134、12375101、12090060、12090064、12247141)、上海交通大学 "双一流 "启动基金(WF220442604)和日本文部科学省 "世界一流国际研究中心计划"(WPI计划)资助
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad4af3
Jie Sheng, Yu Cheng, Weikang Lin, Tsutomu T. Yanagida
The féeton is the gauge boson of the gauge theory. If the gauge coupling constant is extremely small, the féeton becomes a candidate for dark matter. We show that its decay to a pair of an electron and a positron explains the observed Galactic 511-keV gamma-ray excess in a consistent manner. This féeton dark matter decays mainly into pairs neutrino and anti-neutrino. Future low-energy experiments with improved directional capability will enable capturing these neutrino signals. The seesaw-motivated parameter space predicts a relatively short féeton lifetime that is comparable to the current cosmological constraint.
费厄子是规理论的规玻色子。如果量规耦合常数非常小,费厄子就会成为暗物质的候选者。我们的研究表明,它衰变成一对电子和正电子的过程可以解释观测到的银河系 511-keV 伽马射线超标现象。这种费厄子暗物质主要衰变为一对中微子和一对反中微子。未来的低能实验具有更强的定向能力,可以捕捉到这些中微子信号。跷跷板激励的参数空间预测了一个相对较短的费顿寿命,与当前的宇宙学约束相当。
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引用次数: 0
Quenching and flow of charm and bottom quarks via semi-leptonic decay of D and B mesons in Pb+Pb collisions at the LHC* * Supported in part by the National Natural Science Foundation of China (12225503, 11935007, 11890710, 11890711, 12175122, 2021-867). W.-J. X. is supported in part by China Postdoctoral Science Foundation (2023M742099). Some of the calculations were performed in the Nuclear Science Computing Center at Central China Normal University (NSC3), Wuhan, Hubei, China 大型强子对撞机Pb+Pb对撞中通过D介子和B介子的半轻子衰变实现的粲夸克和底夸克的淬灭和流动* * 国家自然科学基金部分资助(12225503, 11935007, 11890710, 11890711, 12175122, 2021-867)。W.-J. X.得到中国博士后科学基金(2023M742099)的部分资助。部分计算在湖北武汉华中师范大学核科学计算中心(NSC3)完成。
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad4c59
Shu-Qing Li, Wen-Jing Xing, Shanshan Cao, Guang-You Qin
Heavy flavor particles provide important probes of the microscopic structure and thermodynamic properties of the quark-gluon plasma (QGP) produced in high-energy nucleus-nucleus collisions. We studied the energy loss and flow of charm and bottom quarks inside the QGP via the nuclear modification factor () and elliptic flow coefficient () of their decayed leptons in heavy-ion collisions at the LHC. The dynamical evolution of the QGP was performed using the CLVisc (3+1)-dimensional viscous hydrodynamics model; the evolution of heavy quarks inside the QGP was simulated with our improved Langevin model that considers both collisional and radiative energy loss of heavy quarks; the hadronization of heavy quarks was simulated via our hybrid coalescence-fragmentation model; and the semi-leptonic decay of D and B mesons was simulated via PYTHIA. Using the same spatial diffusion coefficient for charm and bottom quarks, we obtained smaller and larger of charm decayed leptons than bottom decayed leptons, indicating stronger energy loss of charm quarks than bottom quarks inside the QGP within our current model setup.
重味道粒子是高能原子核-原子核对撞中产生的夸克-胶子等离子体(QGP)微观结构和热力学性质的重要探针。我们在大型强子对撞机的重离子对撞中通过其衰变轻子的核修正因子()和椭圆流系数()研究了QGP内部粲夸克和底夸克的能量损耗和流动。QGP的动力学演化是通过CLVisc(3+1)维粘性流体力学模型进行的;QGP内部重夸克的演化是通过我们改进的朗格文模型模拟的,该模型同时考虑了重夸克的碰撞和辐射能量损失;重夸克的强子化是通过我们的混合凝聚-碎片模型模拟的;D和B介子的半轻子衰变是通过PYTHIA模拟的。在粲夸克和底夸克空间扩散系数相同的情况下,我们得到的粲衰变轻子比底衰变轻子更小和更大,这表明在目前的模型设置下,QGP内部粲夸克的能量损耗比底夸克更强。
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引用次数: 0
Discovery potential of the Glashow resonance in an air shower neutrino telescope* * Project Supported by the ``CUG Scholar'' Scientific Research Funds at China University of Geosciences (Wuhan) (2024014) 格拉肖共振在气淋中微子望远镜中的发现潜力* * 中国地质大学(武汉)"中地学者 "科研基金资助项目(2024014)
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad4c5c
Guo-Yuan Huang
The in-ice or in-water Cherenkov neutrino telescope, such as IceCube, has already proved its power in measuring the Glashow resonance by searching for the bump around arising from the W-boson production. There are many proposals for the next few decades for observations of cosmic tau neutrinos with extensive air showers, also known as tau neutrino telescopes. The air shower telescope is, in principle, sensitive to the Glashow resonance via the channel followed by the tau decay in the air (e.g., TAMBO, which has a geometric area of approximately ). Using a thorough numerical analysis, we find that the discovery significance can be up to 90% with a TAMBO-like setup if PeV neutrinos primarily originate from neutron decays, considering the flux parameters measured by IceCube as the input. The presence of new physics affecting the neutrino flavor composition can also increase the significance. However, if ultrahigh-energy neutrinos are dominantly produced from meson decays, it will be statistically difficult for an advanced proposal such as TAMBO to discriminate the Glashow resonance induced by from the intrinsic background. We have identified several limitations for such advanced telescopes, in comparison with the in-ice or in-water telescope, when measuring resonances: (i) a suppressed branching ratio of 11% for the decay ; (ii) the smearing effect and reduced acceptance because the daughter neutrino takes away 75% of the energy from the W decay; and (iii) a large attenuation effect for Earth-skimming neutrinos with the resonance.
冰内或水中切伦科夫中微子望远镜,如冰立方,已经证明了它在测量格拉肖共振方面的威力,它可以搜索 W 玻色子产生时产生的撞击。在未来的几十年里,有许多关于利用大范围空气淋浴观测宇宙头中微子的建议,这也被称为头中微子望远镜。原则上,空气淋浴望远镜可以通过空气中的陶衰变通道(如 TAMBO,其几何面积约为 )对格拉肖共振敏感。通过全面的数值分析,我们发现,考虑到冰立方测量的通量参数作为输入,如果PeV中微子主要来源于中子衰变,那么类似于TAMBO的装置的发现意义可达90%。影响中微子味道组成的新物理学的存在也会增加发现的意义。然而,如果超高能中微子主要是由介子衰变产生的,那么像 TAMBO 这样的先进方案就很难从统计上将介子衰变引起的格拉肖共振与固有背景区分开来。与冰内或水内望远镜相比,我们发现了这类先进望远镜在测量共振时的几个局限性:(i)衰变的分支比被抑制了 11%;(ii)由于子中微子带走了 W 衰变 75% 的能量,因此产生了抹黑效应并降低了接受度;(iii)共振对地球掠过中微子产生了很大的衰减效应。
{"title":"Discovery potential of the Glashow resonance in an air shower neutrino telescope* * Project Supported by the ``CUG Scholar'' Scientific Research Funds at China University of Geosciences (Wuhan) (2024014)","authors":"Guo-Yuan Huang","doi":"10.1088/1674-1137/ad4c5c","DOIUrl":"https://doi.org/10.1088/1674-1137/ad4c5c","url":null,"abstract":"The in-ice or in-water Cherenkov neutrino telescope, such as IceCube, has already proved its power in measuring the Glashow resonance by searching for the bump around <inline-formula>\u0000<tex-math><?CDATA $ E^{}_{rm nu} = 6.3; {rm PeV} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M1.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> arising from the <italic toggle=\"yes\">W</italic>-boson production. There are many proposals for the next few decades for observations of cosmic tau neutrinos with extensive air showers, also known as tau neutrino telescopes. The air shower telescope is, in principle, sensitive to the Glashow resonance via the channel <inline-formula>\u0000<tex-math><?CDATA $ W to tau nu^{}_{tau} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M2.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> followed by the tau decay in the air (e.g., TAMBO, which has a geometric area of approximately <inline-formula>\u0000<tex-math><?CDATA $ 500; {rm km^2} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M3.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>). Using a thorough numerical analysis, we find that the discovery significance can be up to 90% with a TAMBO-like setup if PeV neutrinos primarily originate from neutron decays, considering the flux parameters measured by IceCube as the input. The presence of new physics affecting the neutrino flavor composition can also increase the significance. However, if ultrahigh-energy neutrinos are dominantly produced from meson decays, it will be statistically difficult for an advanced proposal such as TAMBO to discriminate the Glashow resonance induced by <inline-formula>\u0000<tex-math><?CDATA $ overline{nu}^{}_{e} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M5.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> from the intrinsic <inline-formula>\u0000<tex-math><?CDATA $ nu^{}_{tau}/overline{nu}^{}_{tau} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M6.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> background. We have identified several limitations for such advanced telescopes, in comparison with the in-ice or in-water telescope, when measuring resonances: (i) a suppressed branching ratio of 11% for the decay <inline-formula>\u0000<tex-math><?CDATA $ W to tau nu^{}_{tau} $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M8.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>; (ii) the smearing effect and reduced acceptance because the daughter neutrino takes away <inline-formula>\u0000<tex-math><?CDATA $ langle y rangle sim $?></tex-math>\u0000<inline-graphic xlink:href=\"cpc_48_8_085107_M9.jpg\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula>75% of the energy from the <italic toggle=\"yes\">W</italic> decay; and (iii) a large attenuation effect for Earth-skimming neutrinos with the resonance.","PeriodicalId":10250,"journal":{"name":"Chinese Physics C","volume":null,"pages":null},"PeriodicalIF":3.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141566844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Observational signatures of rotating black holes in the semiclassical gravity with trace anomaly* * Partly Supported by the National Natural Science Foundation of China (12275004, 12205013, 11873044). MG is also endorsed by ”the Fundamental Research Funds for the Central Universities” (2021NTST13) 带痕量异常的半经典引力中旋转黑洞的观测特征* * 部分受国家自然科学基金资助(12275004, 12205013, 11873044)。MG 还得到 "中央高校基本科研业务费"(2021NTST13)的资助。
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-08-01 DOI: 10.1088/1674-1137/ad432b
Zhenyu Zhang, Yehui Hou, Minyong Guo
In a recent work by Fernandes [Phys. Rev. D 108(6), L061502 (2023)], an exact stationary and axisymmetric solution was discovered in semiclassical gravity with type-A trace anomaly. This was identified as a quantum-corrected version of the Kerr black hole. In this study, we explore the observational signatures of this black hole solution. Our investigation reveals that prograde and retrograde light rings exist, whose radii increase monotonically with the coupling parameter α. When α is negative, the shadow area for the quantum-corrected black hole is smaller than that of the Kerr black hole, whereas when α is positive, the area is larger. For a near-extremal black hole, its high-spin feature (the NHEKline) is found to be highly susceptible to disruption by α. Furthermore, we discuss the images of the quantum-corrected black hole in the presence of a thin accretion disk and compare them to those of the Kerr black hole. Our study highlights the importance of near-horizon emission sources in detecting the effects of quantum corrections by black hole images.
费尔南德斯(Fernandes)最近的一项研究[Phys. Rev. D 108(6), L061502 (2023)]发现,在具有A型痕量异常的半经典引力中,存在一个精确的静止和轴对称解。它被认定为量子修正版的克尔黑洞。在这项研究中,我们探索了这种黑洞方案的观测特征。当α为负值时,量子校正黑洞的阴影面积小于克尔黑洞,而当α为正值时,阴影面积则更大。对于近极值黑洞,我们发现它的高自旋特征(NHEKline)极易受到 α 的干扰。此外,我们还讨论了存在薄吸积盘时量子校正黑洞的图像,并将其与克尔黑洞的图像进行了比较。我们的研究强调了近地平线发射源在通过黑洞图像探测量子修正效应方面的重要性。
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引用次数: 0
Periapsis shift in spherically symmetric spacetimes and effects of electric interactions* 球面对称时空的周向位移和电相互作用的影响*
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-07-31 DOI: 10.1088/1674-1137/ad4018
Qianchuan Wang, 乾川 王, Junji Jia and 俊基 贾
The periapsis shift of charged test particles in arbitrary static and spherically symmetric charged spacetimes are studied. Two perturbative methods, the near-circular approximation and post-Newtonian methods, are developed and shown to be very accurate when the results are determined to high orders. The near-circular approximation method is more precise when eccentricity e of the orbit is small, whereas the post-Newtonian method is more effective when orbit semilatus rectum p is large. Results from these two methods are shown to agree when both e is small and p is large. These results are then applied to the Reissner-Nordström spacetime, the Einstein-Maxwell-dilation gravity, and a charged wormhole spacetime. The effects of various parameters on the periapsis shift, particularly that of the electrostatic interaction, are carefully studied. The periapsis shift data of the solar-Mercury are then used to constrain the charges of the Sun and Mercury, and the data of the Sgr A*-S2 periapsis shift are used to determine, for the first time using this method, the constraints of the charges of Sgr A* and S2.
研究了带电测试粒子在任意静态和球对称带电时空中的周向位移。提出了两种微扰方法,即近圆近似法和后牛顿法,并证明当结果确定到高阶时,这两种方法非常精确。当轨道偏心率 e 较小时,近圆近似法更为精确,而当轨道半径 p 较大时,后牛顿法更为有效。结果表明,当 e 较小和 p 较大时,这两种方法的结果是一致的。然后将这些结果应用于赖斯纳-诺德斯特伦时空、爱因斯坦-麦克斯韦膨胀引力和带电虫洞时空。我们仔细研究了各种参数对近间隔位移的影响,特别是静电相互作用的影响。然后利用太阳-水星的近地点移动数据来约束太阳和水星的电荷,并利用 Sgr A*-S2 近地点移动的数据来确定 Sgr A* 和 S2 的电荷约束,这是第一次使用这种方法。
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引用次数: 0
Masses of the conjectured H-dibaryon at different temperatures* 不同温度下推测的 H-二重子的质量*
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-07-31 DOI: 10.1088/1674-1137/ad3d4c
Liang-Kai Wu, 良凯 吴, Han Tang, 涵 汤, Ning Li, 宁 李, Xin-Yang Wang and 昕杨 王
We present a lattice QCD determination of masses of the conjectured H-dibaryon, denoted as , at nine different temperatures: 0.24, 0.63, 0.76, 0.84, 0.95, 1.09, 1.27, 1.52, and 1.90. The masses of baryons N, Σ, Ξ, and Λ at different temperatures were also computed. The simulations were performed on an anisotropic lattice with flavours of clover fermion at a quark mass corresponding to . The thermal ensembles were provided by the FASTSUM collaboration, whereas the zero temperature ensembles were provided by the Hadspec collaboration. We also calculated the spectral density of the correlation function of those particles. The spectral density distributions show a rich peak structure at the lowest temperature; at intermediate temperatures, the mass values of those particles obtained by the extrapolation method reflect a two-peak structure. While the spectral density for the octet baryon becomes smooth at 1.27, 1.52, and 1.90, the spectral density for the H-dibaryon becomes smooth at . At , the mass difference of the H-dibaryon and Λ pair, expressed as , was estimated to be MeV, which suggests the existence of a bound H-dibaryon state.
我们提出了在九种不同温度下对猜想中的 H-二重子(表示为 ,)的质量进行晶格 QCD 测定的结果:0.24、0.63、0.76、0.84、0.95、1.09、1.27、1.52 和 1.90。同时还计算了不同温度下重子 N、Σ、Ξ和Λ的质量。模拟是在一个各向异性的晶格上进行的,晶格上的三叶草费米子的味道与夸克的质量相对应。 热汇编由 FASTSUM 合作小组提供,而零温汇编则由 Hadspec 合作小组提供。我们还计算了这些粒子的相关函数谱密度。在最低温度下,谱密度分布显示出丰富的峰值结构;在中间温度下,通过外推法得到的这些粒子的质量值反映出双峰结构。八重子的谱密度在 1.27、1.52 和 1.90 时变得平滑,而 H-二重子的谱密度在 。在 ,H-二重子和Λ对的质量差(用 ,表示)估计为 MeV,这表明存在一个束缚 H-二重子态。
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引用次数: 0
Analysis of anomalies using weak effective Hamiltonian with complex couplings and their impact on various physical observables 利用具有复杂耦合的弱有效哈密顿分析异常现象及其对各种物理观测指标的影响
IF 3.6 2区 物理与天体物理 Q1 PHYSICS, NUCLEAR Pub Date : 2024-07-31 DOI: 10.1088/1674-1137/ad34bc
Muhammad Arslan, Tahira Yasmeen, Saba Shafaq, Ishtiaq Ahmed and Muhammad Jamil Aslam
Recently, the experimental measurements of the branching ratios and different polarization asymmetries for processes occurring through flavor-changing-charged current transitions by BABAR, Belle, and LHCb have revealed some significant differences from the corresponding Standard Model (SM) predictions. This has triggered an interest to search for physics beyond the SM in the context of various new physics (NP) models and using the model-independent weak effective Hamiltonian (WEH). Assuming left-handed neutrinos, we add the dimension-six vector, (pseudo-)scalar, and tensor operators with complex Wilson coefficients (WCs) to the SM WEH. Using 60%, 30%, and 10% constraints resulting from the branching ratio of , we reassess the parametric space of these new physics WCs accommodating the current anomalies based on the most recent HFLAV data of and and Belle data of and . We find that the allowed parametric region of left-handed scalar couplings strongly depends on the constraints of the branching ratio, and the maximum pull from the SM predictions results from the <60% branching ratio limit. Also, the parametric region changes significantly if we extend the analysis by adding LHCb data of and . Furthermore, due to the large uncertainties in the measurements of and , we derive the sum rules which complement them with and . Using the best-fit points of the new complex WCs along with the latest measurements of , we predict the numerical values of the observable , , and from the sum rules. The simultaneous dependence of abovementioned physical observables on the NP WCs is established by plotting their correlation with and , which are useful to discriminate between various NP scenarios. We find that the most significant impact of NP results from the WC . Finally, we study the impact of these NP couplings on various angular and triple product asymmetries that could be measured in some ongoing and future experiments. The precise measurements of these observables are important to check the SM and extract the possible NP.
最近,BABAR、Belle和LHCb对通过味道变化带电电流转变发生的过程的分支比和不同极化不对称性进行的实验测量显示,它们与相应的标准模型(SM)预测存在一些显著差异。这引发了人们在各种新物理(NP)模型的背景下,利用与模型无关的弱有效哈密顿(WEH)来寻找超越标准模型的物理的兴趣。假设存在左手中微子,我们在SM弱有效哈密顿中加入了具有复杂威尔逊系数(WC)的六维向量、(伪)标量和张量算子。使用由Ⅳ的分支率产生的60%、30%和10%的约束,我们重新评估了这些新物理WCs的参数空间,根据最新的HFLAV数据Ⅳ和Ⅴ以及Belle数据Ⅳ和Ⅴ,这些WCs容纳了当前的反常现象。我们发现,左手标量耦合的允许参数区域在很大程度上取决于支化比的约束,而与SM预言的最大偏差来自<60%的支化比极限。此外,如果我们通过添加 LHCb 的和数据来扩展分析,参数区域也会发生很大变化。此外,由于对 和 的测量存在很大的不确定性,我们推导出了用 和 来补充的和规则。利用新的复 WC 的最佳拟合点以及对 和 的最新测量结果,我们从和规则中预测了可观测到的 和 的数值。通过绘制上述物理观测值与 和 的相关性曲线,我们确定了上述物理观测值同时依赖于NP WCs。我们发现,NP 的最大影响来自 WC 。最后,我们研究了这些 NP 耦合对各种角度和三乘积不对称的影响,这些影响可以在一些正在进行的和未来的实验中测量到。这些观测指标的精确测量对于检验 SM 和提取可能的 NP 非常重要。
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