Letters in High Energy Physics最新文献_第5页

Potential for Definitive Discovery of a 70 GeV Dark Matter WIMP with Only Second-Order Gauge Couplings 只有二阶规范耦合的70GeV暗物质WIMP的最终发现潜力

Letters in High Energy Physics Pub Date : 2022-10-24 DOI: 10.31526/lhep.2023.342

Bailey Tallman, Alexandra Boone, Adhithya Vijayakumar, F. Lopez, Samuel Apata, J. Martinez, Roland E. Allen

{"title":"Potential for Definitive Discovery of a 70 GeV Dark Matter WIMP with Only Second-Order Gauge Couplings","authors":"Bailey Tallman, Alexandra Boone, Adhithya Vijayakumar, F. Lopez, Samuel Apata, J. Martinez, Roland E. Allen","doi":"10.31526/lhep.2023.342","DOIUrl":"https://doi.org/10.31526/lhep.2023.342","url":null,"abstract":"As astronomical observations and their interpretation improve, the case for cold dark matter (CDM) becomes increasingly persuasive. A particularly appealing version of CDM is a weakly interacting massive particle (WIMP) with a mass near the electroweak scale, which can naturally have the observed relic abundance after annihilation in the early universe. But in order for a WIMP to be consistent with the currently stringent experimental constraints it must have relatively small cross-sections for indirect, direct, and collider detection. Using our calculations and estimates of these cross-sections, we discuss the potential for discovery of a recently proposed dark matter WIMP which has a mass of about 70 GeV/c$^2$ and only second-order couplings to W and Z bosons. There is evidence that indirect detection may already have been achieved, since analyses of the gamma rays detected by Fermi-LAT and the antiprotons observed by AMS-02 are consistent with 70 GeV dark matter having our calculated $langle sigma_{ann} v rangle approx 1.2 times 10^{-26} $ cm$^3$/s. The estimated sensitivities for LZ and XENONnT indicate that these experiments may achieve direct detection within the next few years, since we estimate the relevant cross-section to be slightly above $10^{-48}$ cm$^2$. Other experiments such as PandaX, SuperCDMS, and especially DARWIN should be able to confirm on a longer time scale. The high-luminosity LHC might achieve collider detection within about 15 years, since we estimate a collider cross-section slightly below 1 femtobarn. Definitive confirmation should come from still more powerful planned collider experiments (such as a future circular collider) within 15-35 years.","PeriodicalId":36085,"journal":{"name":"Letters in High Energy Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47809643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Intermediate-Distance String Effects in Wilson Loops via Boundary Action 边界作用下Wilson环中的中距离弦效应

Letters in High Energy Physics Pub Date : 2022-10-10 DOI: 10.31526/LHEP.2023.431

M. N. Khalil, A. Khalaf, A. Bakry, M. Deliyergiyev, A. Galal, M. Kotb, M. Okasha, G. Ahmed

引用次数: 1

Capture of Dark Matter Particles by a Galaxy in the Case of a Bimodal Distribution of Their Velocities 在速度双峰分布的情况下星系对暗物质粒子的捕获

Letters in High Energy Physics Pub Date : 2022-09-05 DOI: 10.31526/LHEP.2023.331

R. Durrer, S. Parnovsky, A. Parnowski

引用次数: 1

Kerr Black Holes within the Membrane Paradigm 膜范式中的克尔黑洞

Letters in High Energy Physics Pub Date : 2022-08-25 DOI: 10.31526/lhep.2022.328

A. Arslanaliev, A. Nurmagambetov

{"title":"Kerr Black Holes within the Membrane Paradigm","authors":"A. Arslanaliev, A. Nurmagambetov","doi":"10.31526/lhep.2022.328","DOIUrl":"https://doi.org/10.31526/lhep.2022.328","url":null,"abstract":"We consider the membrane viewpoint a l`a Parikh-Wilczek on the Kerr solution for a rotating black hole. Computing the stress-energy tensor of a close-to-the-horizon stretched membrane and comparing it to the stress-tensor of a viscous fluid, we recover transport coefficients in terms of the Kerr geometry. Viscosities of the dual fluid remain constant, while the rest of the transport coefficients become complex functions of radial and angle coordinates. We study the qualitative behavior of the pressure, expansion, and energy/momentum densities for two specific black holes: the slowly rotating black hole, with the angular momentum of one percent of the black hole mass squared, and the extremal Kerr black hole. For the Kerr solution in the Boyer-Lindquist coordinates, these transport coefficients generally have poles at different values of the radial coordinate in the range between the horizon and the Schwarzschild radius of the black hole, in dependence on the fixed angle direction. We briefly discuss our findings in the context of a relation between the Membrane Paradigm and the AdS/CFT correspondence, the KSS bound violation, the coordinate choice, and a non-stationary extension of the Kerr solution.","PeriodicalId":36085,"journal":{"name":"Letters in High Energy Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46032332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

FRW Cosmology with a Varying Cubic Deceleration Parameter 变三次减速参数的FRW宇宙学

Letters in High Energy Physics Pub Date : 2022-08-20 DOI: 10.31526/lhep.2023.330

Leishingam Kumrah, S. S. Singh, L. Devi, Md Khurshid Alam

引用次数: 0

Majorana Neutrinos and Clockworked Yukawa Couplings Contribution to Nonobservation of the Rare Leptonic Decayli→ljγ, Clockwork Photon and Clockwork Graviton Majorana中微子和Yukawa顺时针耦合对罕见轻子衰变未观测到的贡献→ljγ、发条光子和发条引力

Letters in High Energy Physics Pub Date : 2022-08-16 DOI: 10.31526/lhep.2023.351

Gayatri Ghosh

{"title":"Majorana Neutrinos and Clockworked Yukawa Couplings Contribution to Nonobservation of the Rare Leptonic Decayli→ljγ, Clockwork Photon and Clockwork Graviton","authors":"Gayatri Ghosh","doi":"10.31526/lhep.2023.351","DOIUrl":"https://doi.org/10.31526/lhep.2023.351","url":null,"abstract":"The clockwork is an extra-dimensional set-up for generating light particles with exponentially suppressed or hierarchical couplings of light particles with N massive states having comparable masses near the threshold scale of the mechanism in theories which contain no small parameters at the fundamental level. We explore the prospect of charged lepton flavour violation (cLFV) in a clockwork framework which encompasses Dirac mass terms as well as Majorana mass terms for the new clockwork fermions. We deive the masses of the non zero clockwork Majorana masses, and new particles in a clockwork framework and for their Yukawa couplings to the lepton doublets, in the framework where the clockwork parameters are universal. When the new clockwork Majorana masses are non zero, neutrino masses are generated as a result from the exchange of heavy messenger particles such as right handed iso$-$singlet neutrinos or iso$ - $triplet scalar bosons known as the seesaw mechanism. In the case of non zero clockwork Majorana masses, owing to the sizable effective Yukawa couplings of the higher mass modes neutrino masses can only be made tiny by conjecturing large Majorana mass in the teraelectron volt range for allthe clockwork gears. This is apparent from the constraints on the mass scale of the clockwork fermions due to the non-observation of the rare cLFV decay $ murightarrow egamma $, $ tau rightarrow mu gamma $, $ taurightarrow egamma $. A general description of the clockwork mechanism valid for fermions, gauge bosons, and gravitons is discussed here. This mechanism can be implemented with a discrete set of new fields or, in its continuum version, through an extra spatial dimension.","PeriodicalId":36085,"journal":{"name":"Letters in High Energy Physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42710301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Dynamical Synchronization, the Horizon Problem, and Initial Conditions for Inflation 动态同步、地平线问题和通货膨胀的初始条件

Letters in High Energy Physics Pub Date : 2022-08-15 DOI: 10.31526/lhep.2023.322

S. Cotsakis

引用次数: 0

Q-Field from a 4D Brane: Cosmological Constant Cancellation and Minkowski Attractor 四维膜的q场:宇宙学常数抵消和闵可夫斯基吸引子

Letters in High Energy Physics Pub Date : 2022-07-07 DOI: 10.31526/LHEP.2022.312

F. Klinkhamer

引用次数: 2

Probing the Electroweak Phase Transition with Exotic Higgs Decays 用奇异希格斯衰变探测电弱相变

Letters in High Energy Physics Pub Date : 2022-03-15 DOI: 10.31526/lhep.2023.432

M. Carena, J. Kozaczuk, Zhen Liu, Tong Ou, M. Ramsey-Musolf, J. Shelton, Yikun Wang, Ke-Pan Xie

引用次数: 15

Nonzero θ13 with A4 × Z4 Flavor Symmetry Group 非零θ13与A4 × Z4风味对称群

Letters in High Energy Physics Pub Date : 2022-01-01 DOI: 10.31526/lhep.2022.340

Victoria Puyam, N. Singh

引用次数: 2