Journal of High Energy Physics最新文献_第4页

Gravity in enhanced brane-world models 增强膜世界模型中的重力

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)199

Quim Llorens

引用次数: 0

Conformal and pure scale-invariant gravities in d dimensions d维的共形和纯尺度不变引力

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)202

Anamaria Hell, Dieter Lüst

{"title":"Conformal and pure scale-invariant gravities in d dimensions","authors":"Anamaria Hell, Dieter Lüst","doi":"10.1007/JHEP09(2025)202","DOIUrl":"10.1007/JHEP09(2025)202","url":null,"abstract":"We consider conformal and scale-invariant gravities in d dimensions, with a special focus on pure R2 gravity in the scale-invariant case. In four dimensions, the structure of these theories is well known. However, in dimensions larger than four, the behavior of the modes is so far unclear. In this work, we explore this question, studying the theories in conformally flat spacetimes as well as anisotropic backgrounds. First, we consider the pure theory in d-dimensions. We show that this theory propagates no degrees of freedom for flat space-time. Otherwise, we find the theory in the corresponding Einstein frame and show that it propagates a scalar field and two tensor modes, that arise from Einstein’s gravity. We then consider conformal gravity in d dimensions. We argue on the number of degrees of freedom for conformally flat space-times and show that for d > 4, there exists a frame in which this theory can be written as the Weyl-squared gravity with a cosmological constant, and also generalize this formulation to the f(W)2 theories. Then, we consider the specific model of conformal gravity in five dimensions. We find the analytical and numerical solutions for the anisotropic Universe for this case, which admits super-Hubble and exponential expansions. Finally, we consider the perturbations around these solutions and study the number of the degrees of freedom.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)202.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Charmed baryon decays: SU(3)F breaking and CP violation 迷人重子衰变：SU(3)F破坏和CP破坏

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)193

Chang Yang, Xiao-Gang He, Chia-Wei Liu

{"title":"Charmed baryon decays: SU(3)F breaking and CP violation","authors":"Chang Yang, Xiao-Gang He, Chia-Wei Liu","doi":"10.1007/JHEP09(2025)193","DOIUrl":"10.1007/JHEP09(2025)193","url":null,"abstract":"We present a comprehensive study of anti-triplet charmed baryon decays into octet baryons and pseudoscalar mesons using the SU(3)F flavor symmetry framework. By decomposing the flavor structure, all decay amplitudes are parametrized with a minimal set of irreducible amplitudes, and the Körner-Pati-Woo theorem further reduces the number of independent parameters from the original 35 to 19 under exact symmetry when small terms proportional to ( {lambda}_b={V}_{cb}^{ast }{V}_{ub} ) are neglected. The independent number becomes 27 with leading SU(3)F breaking effects. A global fit to 51 experimental measurements yields a χ2/d.o.f. of 2.36 and provides precise values for the decay amplitudes. Notable discrepancies are observed in the fitted branching fractions of ( {Xi}_c^0to {Xi}^{-}{pi}^{+} ) and ( {Xi}_c^{+}to {Xi}^{-}{pi}^{+}{pi}^{+} ), which exceed current measurements by more than 2σ. Incorporating final-state rescattering effects to recover the main effects of terms proportional to λb, we predict enhanced CP violation, with ACP reaching up to 10−3 in golden channels such as ( {Xi}_c^0to p{K}^{-} ) and ( {Xi}_c^0to {Sigma}^{+}{pi}^{-} ). Our analysis also finds that the branching ratio for ( {Xi}_c^{+}to Lambda {pi}^{+} ) is enhanced to (9.7 ± 1.2) × 10−4 due to significant cancellations.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)193.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pair production of massive charged vector bosons from the worldline 来自世界线的大质量带电矢量玻色子的对产生

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)201

Fiorenzo Bastianelli, Filippo Fecit, Alessandro Miccichè

{"title":"Pair production of massive charged vector bosons from the worldline","authors":"Fiorenzo Bastianelli, Filippo Fecit, Alessandro Miccichè","doi":"10.1007/JHEP09(2025)201","DOIUrl":"10.1007/JHEP09(2025)201","url":null,"abstract":"We investigate a worldline formulation for a massive spin-1 particle interacting with an electromagnetic background. Two first-quantized descriptions of the spin degrees of freedom are considered: one based on bosonic oscillators and the other on fermionic oscillators. Focusing initially on the bosonic model — which can accommodate particles of arbitrary integer spin — we review how quantization in the spin-1 sector, performed both via Dirac’s method and BRST quantization, reproduces the free Proca field theory.We then introduce coupling to an external electromagnetic field and demonstrate that Maxwell’s equations for the background emerge as a consistency condition for the nilpotency of the BRST charge on the spin-1 sector. Encouraged by this result, which proves the viability of the particle model, we proceed to construct a path integral quantization of the worldline action for the charged spin-1 particle on the circle. This yields the one-loop effective Lagrangian for a constant electromagnetic field induced by a massive charged vector boson. As expected, the result reveals a vacuum instability, which we quantify by deriving the pair production rate for the vector bosons, recovering previous results obtained in quantum field theory.For comparison, we repeat the analysis using the standard ( mathcal{N} ) = 2 spinning particle model, which contains fermionic worldline degrees of freedom, finding identical results.Finally, we comment on possible extensions of the worldline models to include effective interactions and briefly explore their implications for pair production.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)201.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermofield theory of large N matrix models 大N矩阵模型的热场理论

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)192

Antal Jevicki, Xianlong Liu, Junjie Zheng

引用次数: 0

Quantum decoherence in the Caldeira-Leggett model by the real-time path integral on a computer 用计算机实时路径积分计算Caldeira-Leggett模型中的量子退相干

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)197

Jun Nishimura, Hiromasa Watanabe

{"title":"Quantum decoherence in the Caldeira-Leggett model by the real-time path integral on a computer","authors":"Jun Nishimura, Hiromasa Watanabe","doi":"10.1007/JHEP09(2025)197","DOIUrl":"10.1007/JHEP09(2025)197","url":null,"abstract":"We propose first-principle calculations of an open system based on the real-time path integral formalism treating the environment as well as the system of our interest together on a computer. The sign problem that occurs in applying Monte Carlo methods can be overcome in general by using the so-called Lefschetz thimble method, which has been developed over the past decade. Here we focus on the Caldeira-Leggett model, which is well known, in particular, as a model of quantum decoherence. In this case, the calculation simplifies drastically since the path integral becomes Gaussian for typical initial conditions. The relevant saddle point, which is unique and complex, can be determined by solving a linear equation with a huge but sparse coefficient matrix, and the integration over the Lefschetz thimble can be performed analytically. Thus we obtain, without assumptions or approximations, the reduced density matrix after a long-time evolution, tracing out a large number of harmonic oscillators in the environment. In particular, we confirm the dependence of the decoherence time on the coupling constant and the temperature that has been predicted from the master equation in a certain parameter regime.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)197.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lepton number violation Higgs decay at muon collider 介子对撞机上的轻子数违反希格斯衰变

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)200

Fa-Xin Yang, Feng-Lan Shao, Zhi-Long Han, Fei Huang, Yi Jin, Honglei Li

{"title":"Lepton number violation Higgs decay at muon collider","authors":"Fa-Xin Yang, Feng-Lan Shao, Zhi-Long Han, Fei Huang, Yi Jin, Honglei Li","doi":"10.1007/JHEP09(2025)200","DOIUrl":"10.1007/JHEP09(2025)200","url":null,"abstract":"In this paper, we consider the scalar singlet extension of type-I seesaw, where a scalar singlet S and a heavy neutral lepton N are further introduced. The Majorana mass term of heavy neutral lepton is generated through the Yukawa interaction with the scalar singlet, which then induces the lepton number violation decays of SM Higgs h and heavy Higgs H via mixing of scalars. As a pathway to probe the origin of heavy neutral lepton mass, we investigate the lepton number violation Higgs decay signature at the TeV- scale muon collider. The dominant production channel of Higgs bosons at the TeV-scale muon collider is via vector boson fusion. So we perform a detailed analysis of the signal process μ+μ− → ( {nu}_{mu }{overline{nu}}_{mu }h/H ) → ( {nu}_{mu }{overline{nu}}_{mu } NN ) followed by N → μ±jj, where the two jets from W boson decay are treated as one fat-jet J. With an integrated luminosity of 1(10) ab−1, the 3 (10) TeV muon collider could discover the lepton number violation SM Higgs decay h → μ±μ±JJ signature for the Higgs mixing parameter sin α > 0.05(0.009). Meanwhile, a large parameter space can be detected by the lepton number violation heavy Higgs decay H → μ±μ±JJ signature for mH ≲ 1(3) TeV and sin α ≳ 0.03(0.005) at the 3 (10) TeV muon collider. Therefore, the lepton number violation SM and heavy Higgs decay signatures are both promising at the TeV scale muon collider.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)200.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144967","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Superradiant dark matter production from primordial black holes: impact of multiple modes and gravitational wave emission 原始黑洞产生超辐射暗物质：多模态和引力波发射的影响

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-24 DOI: 10.1007/JHEP09(2025)195

Nayun Jia, Shou-Shan Bao, Chen Zhang, Hong Zhang, Xin Zhang

{"title":"Superradiant dark matter production from primordial black holes: impact of multiple modes and gravitational wave emission","authors":"Nayun Jia, Shou-Shan Bao, Chen Zhang, Hong Zhang, Xin Zhang","doi":"10.1007/JHEP09(2025)195","DOIUrl":"10.1007/JHEP09(2025)195","url":null,"abstract":"Rotating primordial black holes (PBHs) in the early universe can emit particles through superradiance, a process particularly efficient when the particle’s Compton wavelength is comparable to the PBH’s gravitational radius. Superradiance leads to an exponential growth of particle occupation numbers in gravitationally bound states. We present an analysis of heavy bosonic dark matter (DM) production through three gravitational mechanisms: Hawking radiation, superradiant instabilities, and ultraviolet (UV) freeze-in. We consider PBHs that evaporate before Big Bang Nucleosynthesis (BBN). For both scalar and vector DM, our analysis incorporates the evolution of a second superradiant mode. We demonstrate that the growth of a second superradiant mode causes the decay of the first mode, and thus the second mode cannot further enhance the DM abundance beyond that already achieved by the first mode. Our study also reveals that while superradiance generally enhances DM production, gravitational wave (GW) emission from the superradiant cloud may significantly modify this picture. For scalar DM, GW emission reduces the parameter space where superradiance effectively augments relic abundance. For vector DM, rapid GW emission from the superradiant cloud may yield relic abundances below those achieved through Hawking radiation alone. These findings demonstrate that multiple-mode effect and GW emission play critical roles in modeling DM production from PBHs in the early universe.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)195.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145145101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Partonic distribution functions and amplitudes using tensor network methods 使用张量网络方法的局部分布函数和振幅

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-23 DOI: 10.1007/JHEP09(2025)176

Zhong-Bo Kang, Noah Moran, Peter Nguyen, Wenyang Qian

引用次数: 0

SCET sum rules for Λb → Λℓ+ℓ−, Λγ decays 对于Λb→Λ的SCET求和规则，以及对于Λγ衰减的SCET求和规则

IF 5.5 1区物理与天体物理

Journal of High Energy Physics Pub Date : 2025-09-23 DOI: 10.1007/JHEP09(2025)172

Long-Shun Lu, Cai-Dian Lü, Yue-Long Shen, Yan-Bing Wei

{"title":"SCET sum rules for Λb → Λℓ+ℓ−, Λγ decays","authors":"Long-Shun Lu, Cai-Dian Lü, Yue-Long Shen, Yan-Bing Wei","doi":"10.1007/JHEP09(2025)172","DOIUrl":"10.1007/JHEP09(2025)172","url":null,"abstract":"We construct light-cone sum rules for various types of effective form factors in the Λb → Λℓ+ℓ− and Λb → Λγ decays by analyzing vacuum-to-Λb (or γ*-to-Λb) correlation functions with the light Λ-baryon interpolating current. These form factors, defined via hadronic matrix elements within soft-collinear effective theory (SCET), enter the next-to-leading-power QCD factorization formulas for large-recoil transitions. Implementing the perturbative matching from SCETI to heavy quark effective theory, we determine the hard-collinear functions at next-to-leading-order accuracy. Based on light-cone sum rule predictions for the Λb → Λ form factors, we compute the q2-dependent differential branching fraction, forward-backward asymmetry and dilepton longitudinal polarization fraction for Λb → Λℓ+ℓ− decay, as well as the branching fraction for Λb → Λγ decay.","PeriodicalId":635,"journal":{"name":"Journal of High Energy Physics","volume":"2025 9","pages":""},"PeriodicalIF":5.5,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/JHEP09(2025)172.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145144461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0