arXiv - PHYS - High Energy Physics - Phenomenology最新文献_第6页

High-Energy and Ultra-High-Energy Neutrinos from Primordial Black Holes 来自原始黑洞的高能和超高能中微子

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-14 DOI: arxiv-2409.09468

Quan-feng Wu, Xun-Jie Xu

{"title":"High-Energy and Ultra-High-Energy Neutrinos from Primordial Black Holes","authors":"Quan-feng Wu, Xun-Jie Xu","doi":"arxiv-2409.09468","DOIUrl":"https://doi.org/arxiv-2409.09468","url":null,"abstract":"Primordial Black Holes (PBHs) are capable of emitting extremely energetic\u0000particles independent of their interactions with the Standard Model. In this\u0000work, we investigate a particularly interesting scenario in which PBHs\u0000evaporating in the early universe may be responsible for some of the observed\u0000high-energy neutrinos above the TeV or PeV scale in the present universe. We\u0000compute the energy spectrum of neutrinos directly emitted by PBHs with a\u0000monochromatic mass function and estimate the wash-out point, which determines\u0000the maximum energy of the spectrum. We find that the spectrum generally extends\u0000to high energies following a power law of $E_{nu}^{-3}$ until it reaches the\u0000wash-out point, which crucially depends on the PBH mass. For PBHs of $10^{13}$\u0000grams, the spectrum can extend up to the PeV scale, though the flux is too low\u0000for detection. We also consider an indirect production mechanism involving dark\u0000particles that are emitted by PBHs and decay into neutrinos at a much later\u0000epoch. This mechanism allows lighter (such as those in the gram to kilogram\u0000range) PBHs to produce more energetic neutrino fluxes without being washed out\u0000by the thermal plasma in the early universe. In this scenario, we find that\u0000ultra-high-energy neutrinos around or above the EeV scale can be generated,\u0000with sufficiently high fluxes detectable by current and future high-energy\u0000neutrino observatories such as IceCube and GRAND.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258879","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: 0

Light Right-handed Smuons at the LHC: Natural Dark Matter and $g_μ-2$ in an Unexplored Realm of the pMSSM 大型强子对撞机上的轻右手斯姆子：pMSSM 未探索领域中的自然暗物质和 $g_μ-2$

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-14 DOI: arxiv-2409.09474

Xiangwei Yin, Tianjun Li, James A. Maxin, Dimitri V. Nanopoulos

引用次数: 0

Tachyonic effects on Kähler moduli stabilized inflaton potential in type-IIB/F theory 对 IIB/F 型理论中凯勒模量稳定流入势的时速效应

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-14 DOI: arxiv-2409.09283

Abhijit Let, Buddhadeb Ghosh

引用次数: 0

Insight into the nature of the $P_{c}(4457)$ and related pentaquarks 洞察$P_{c}(4457)$及相关五夸克的本质

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-14 DOI: arxiv-2409.09449

U. Özdem

{"title":"Insight into the nature of the $P_{c}(4457)$ and related pentaquarks","authors":"U. Özdem","doi":"arxiv-2409.09449","DOIUrl":"https://doi.org/arxiv-2409.09449","url":null,"abstract":"We systematically study the electromagnetic properties of pentaquark states\u0000from different perspectives to better understand their nature, internal\u0000structure, and quantum numbers, determine their hadronization processes, and\u0000shed light on their true nature. The present study examines the magnetic\u0000moments of the $P_{c}(4457)$ and related hidden-charm pentaquark states with\u0000and without strangeness ($[d d][u c] bar c$, $[u u][s c] bar c$, $[dd ][s c]\u0000bar c$, $[s s][u c] bar c$ and $[s s][d c] bar c$), employing a\u0000comprehensive analysis that encompasses both the compact pentaquark\u0000configuration and $J^P = frac{3}{2}^-$ quantum numbers. The present study\u0000compares the results regarding the magnetic moment of the $P_{c}(4457)$\u0000pentaquark state with those reported in the existing literature. The numerical\u0000results obtained in this study, when considered alongside existing literature,\u0000indicate that the magnetic moments of hidden-charm pentaquark states may offer\u0000insights into their underlying structures, which in turn can inform the\u0000distinction between their spin-parity quantum numbers. It seems that for the\u0000future experimental search of the family of hidden-charm pentaquark states,\u0000studying the electromagnetic properties of the hidden-charm pentaquark states\u0000can provide valuable information.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258982","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: 0

Study of quasi-two-body B^{0}rightarrow T(ππ, Kbar{K},πη) decays in perturbative QCD approach 以微扰 QCD 方法研究准两体 B^{0}rightarrow T(ππ,Kbar{K},πη)衰变

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-14 DOI: arxiv-2409.09349

Lun-Lian Mu, Xian-Qiao Yu

{"title":"Study of quasi-two-body B^{0}rightarrow T(ππ, Kbar{K},πη) decays in perturbative QCD approach","authors":"Lun-Lian Mu, Xian-Qiao Yu","doi":"arxiv-2409.09349","DOIUrl":"https://doi.org/arxiv-2409.09349","url":null,"abstract":"In this study, we calculate the CP-averaged branching ratios and the direct\u0000CP-violating asymmetries of the three body decays B^{0}rightarrow T(pipi,\u0000Kbar{K},pieta) in the perturbative QCD (PQCD) approach, where T denotes\u0000tensor mesons a_{2}(1320), K^{*}_{2}(1430), f_{2}(1270) and f^{'}_{2}(1525),\u0000the daughter branching is f_{0}(980)rightarrow pipi,\u0000Kbar{K},f_{0}(500)rightarrow pipi, a_{0}(980)rightarrow Kbar{K}, pieta.\u0000By introducing two-meson distribution amplitudes parameterized by the time-like\u0000form factors, the three-body decay is simplified to quasi-two-body decay. Based\u0000on the two-quark structure, considering the effect of mixing angle theta\u0000between f_{0}(980) and f_{0}(500), phi between f_{2}(1270) and f^{'}_{2}(1525)\u0000on our calculations. We found that (a) Taking theta=135^{circ}, under the\u0000narrow-width approximation we extract the decays B^{0}rightarrow\u0000K^{*}_{2}(1430)^{0}f_{0}(980) branching fractions is agree with the current\u0000experimental data well. (b) The decay rates for the considered decay modes are\u0000generally in the order of 10^{-8}$ to $10^{-5}. (c)The branching fractions are\u0000sensitive to the theta, and the opposite is true for phi. The phi is really\u0000small, so the decay branching ratio only has little change, except for some\u0000decays involving f^{'}_{2}(1525). (d)The theta and phi can bring remarkable\u0000change to the direct CP asymmetries of pure penguin processes so that it is not\u00000. (e)We calculate the relative partial decay widths {Gamma}(a_{0} rightarrow\u0000Koverline{K})/{Gamma}(a_{0} rightarrow pieta) and the ratio {cal B}(f_{0}\u0000rightarrow K^{+}K^{-})/{cal B}(f_{0} rightarrow pi^{+}pi^{-}), which are\u0000in agreement with the existing experimental values. Our results can help to\u0000understand the internal structure of scalar mesons and the nature of tensor\u0000mesons and be tested by future experiments.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258920","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: 0

Chiral dark matter and radiative neutrino masses from gauged U(1) symmetry 从计U(1)对称性看手性暗物质和辐射中微子质量

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-13 DOI: arxiv-2409.09008

K. S. Babu, Shreyashi Chakdar, Vishnu P. K

引用次数: 0

Hot Leptogenesis 热eptogenesis

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-13 DOI: arxiv-2409.09113

Michael J. Baker, Ansh Bhatnagar, Djuna Croon, Jessica Turner

引用次数: 0

Diffuse Neutrino Background from Magnetorotational Stellar Core Collapses 来自磁动恒星核心坍缩的弥散中微子背景

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-13 DOI: arxiv-2409.09126

Pablo Martínez-Miravé, Irene Tamborra, Miguel Ángel Aloy, Martin Obergaulinger

{"title":"Diffuse Neutrino Background from Magnetorotational Stellar Core Collapses","authors":"Pablo Martínez-Miravé, Irene Tamborra, Miguel Ángel Aloy, Martin Obergaulinger","doi":"arxiv-2409.09126","DOIUrl":"https://doi.org/arxiv-2409.09126","url":null,"abstract":"A statistically significant detection of the diffuse supernova neutrino\u0000background (DSNB) is around the corner. To this purpose, we assess the\u0000contribution to the DSNB of magnetorotational collapses of massive stars,\u0000relying on a suite of state-of-the-art three-dimensional\u0000neutrino-magnetohydrodynamic simulations. We find that neutrinos from\u0000magnetorotational core collapses boost the high-energy tail of the DSNB\u0000spectrum, similar to what is expected from neutrino-driven black hole-forming\u0000collapses. The latest data from the Super-Kamiokande Collaboration can already\u0000exclude that more than $13%$ of all collapsing massive stars undergo\u0000magnetorotational collapses under optimistic assumptions. A DSNB detection at\u0000$3 sigma$ could take place up to $4$ yr earlier at Super-Kamiokande-Gadolinium\u0000or JUNO if the fraction of magnetorotational collapses should be larger than\u0000$10%$. Fascinatingly, if the fraction of magnetorotational stellar collapses\u0000should be larger than $7%$, Hyper-Kamiokande could measure such a fraction at\u0000$3sigma$ after $20$ yr of DSNB data taking. The combination of DSNB and\u0000electromagnetic data has the potential to resolve the degenerate contributions\u0000from magnetorotational and neutrino-driven black hole-forming collapses,\u0000providing crucial insight on the properties of the population of collapsing\u0000massive stars.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258985","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: 0

The Large Magellanic Cloud: expanding the low-mass parameter space of dark matter direct detection 大麦哲伦云：扩大暗物质直接探测的低质量参数空间

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-13 DOI: arxiv-2409.09119

Javier Reynoso-Cordova, Nassim Bozorgnia, Marie-Cécile Piro

{"title":"The Large Magellanic Cloud: expanding the low-mass parameter space of dark matter direct detection","authors":"Javier Reynoso-Cordova, Nassim Bozorgnia, Marie-Cécile Piro","doi":"arxiv-2409.09119","DOIUrl":"https://doi.org/arxiv-2409.09119","url":null,"abstract":"We investigate how the Large Magellanic Cloud (LMC) impacts the predicted\u0000signals in near-future direct detection experiments for non-standard dark\u0000matter (DM) interactions, using the Auriga cosmological simulations. We extract\u0000the local DM distribution of a simulated Milky Way-like halo that has an LMC\u0000analogue and study the expected signals in DarkSide-20k, SBC, DARWIN/XLZD,\u0000SuperCDMS, NEWS-G, and DarkSPHERE considering DM-nucleon effective\u0000interactions, as well as inelastic DM scattering. We find that the LMC causes\u0000substantial shifts in direct detection exclusion limits towards smaller cross\u0000sections and DM masses for all non-relativistic effective field theory (NREFT)\u0000operators, with the impact being highly pronounced for velocity-dependent\u0000operators at low DM masses. For inelastic DM, where the DM particle up-scatters\u0000to a heavier state, the LMC shifts the direct detection exclusion limits\u0000towards larger DM mass splitting and smaller cross sections. Thus, we show that\u0000the LMC significantly expands the parameter space that can be probed by direct\u0000detection experiments towards smaller DM-nucleon cross sections for all NREFT\u0000operators and larger values of mass splitting for inelastic DM.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258923","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: 0

A Closer Look at Dark Vector Splitting Functions in Proton Bremsstrahlung 近距离观察质子轫致辐射中的暗矢量分裂函数

arXiv - PHYS - High Energy Physics - Phenomenology Pub Date : 2024-09-13 DOI: arxiv-2409.09123

Saeid Foroughi-Abari, Peter Reimitz, Adam Ritz

引用次数: 0