Physics Letters B最新文献_第3页

Microlensing and event rate of static spherically symmetric wormhole 静态球对称虫洞的微透镜和事件发生率

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-12 DOI: 10.1016/j.physletb.2024.139019

引用次数: 0

Mach's principle and dark matter 马赫原理与暗物质

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-12 DOI: 10.1016/j.physletb.2024.139001

{"title":"Mach's principle and dark matter","authors":"","doi":"10.1016/j.physletb.2024.139001","DOIUrl":"10.1016/j.physletb.2024.139001","url":null,"abstract":"<div>In this paper we entertain a Machian setting where local physics is non-locally affected by the whole Universe, taking the liberty to identify the local (“Newton's bucket”) with our visible Universe, and the whole Universe (Mach's “fixed stars”) with the global Universe beyond our horizon. Crucially, we allow for the two to have different properties, so that we are beyond the traditional FRW setting. For definiteness we focus on theories where non-locality arises from evolution in the laws of physics in terms of spatially global time variables dual to the constants of Nature. Since non-local theories are foliation-dependent, the local (but not the global) Hamiltonian constraint is lost. This is true not only while non-locality is taking place, but also after it ceases: the local Hamiltonian constraint is only recovered up to a constant in time, keeping a memory of the integrated past non-locality. We show that this integration constant is equivalent to preserving the local Hamiltonian constraint and adding an extra fluid with the same cosmological properties as conventional pressureless dark matter. The equivalence breaks down in terms of clustering properties, with the new component attracting other matter, but not budging from its location. This is the ultimate “painted-on” dark matter, attracting but not being attracted, and nailing down a preferred frame.</div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005598/pdfft?md5=b26ae46d5aae50bf748533b2b67db85b&pid=1-s2.0-S0370269324005598-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Neutrino mixing from a fresh perspective 从全新角度看中微子混合

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-12 DOI: 10.1016/j.physletb.2024.139020

引用次数: 0

Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb–Pb collisions at sNN=5.02 TeV 在[公式省略]TeV波长的Pb-Pb对撞中测量相干ρ0光生成中与撞击参数相关的方位各向异性

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-12 DOI: 10.1016/j.physletb.2024.139017

{"title":"Measurement of the impact-parameter dependent azimuthal anisotropy in coherent ρ0 photoproduction in Pb–Pb collisions at sNN=5.02 TeV","authors":"","doi":"10.1016/j.physletb.2024.139017","DOIUrl":"10.1016/j.physletb.2024.139017","url":null,"abstract":"<div>This Letter presents the first measurement of the impact-parameter dependent angular anisotropy in the decay of coherently photoproduced <math><msup><mrow><mi>ρ</mi></mrow><mrow><mn>0</mn></mrow></msup></math> mesons. The <math><msup><mrow><mi>ρ</mi></mrow><mrow><mn>0</mn></mrow></msup></math> mesons are reconstructed through their decay into pion pairs. The measured anisotropy corresponds to the amplitude of the <math><mi>cos</mi><mo>⁡</mo><mo>(</mo><mn>2</mn><mi>ϕ</mi><mo>)</mo></math> modulation, where ϕ is the angle between the two vectors formed by the sum and the difference of the transverse momenta of the pions, respectively. The measurement was performed by the ALICE Collaboration at the LHC using data from ultraperipheral Pb–Pb collisions at a center-of-mass energy of <math><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msqrt><mspace></mspace><mo>=</mo><mspace></mspace><mn>5.02</mn></math> TeV per nucleon pair. Different impact-parameter regions are selected by classifying the events in nuclear-breakup classes. The amplitude of the <math><mi>cos</mi><mo>⁡</mo><mo>(</mo><mn>2</mn><mi>ϕ</mi><mo>)</mo></math> modulation is found to increase by about one order of magnitude from large to small impact parameters. Theoretical calculations describe the measured <math><mi>cos</mi><mo>⁡</mo><mo>(</mo><mn>2</mn><mi>ϕ</mi><mo>)</mo></math> anisotropy and its impact-parameter dependence as the result of a quantum interference effect at the femtometer scale, arising from the ambiguity regarding which of the nuclei is the photon source in the interaction.</div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005756/pdfft?md5=b7a0c85833b0c6b9af41ae853f4f2124&pid=1-s2.0-S0370269324005756-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142246813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Prediction of the dark fermion mass using multicritical-point principle 利用多临界点原理预测暗费米子质量

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-12 DOI: 10.1016/j.physletb.2024.139025

引用次数: 0

Gravitational wave signal extraction against non-stationary instrumental noises with deep neural network 利用深度神经网络提取引力波信号，对抗非稳态仪器噪声

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-12 DOI: 10.1016/j.physletb.2024.139016

{"title":"Gravitational wave signal extraction against non-stationary instrumental noises with deep neural network","authors":"","doi":"10.1016/j.physletb.2024.139016","DOIUrl":"10.1016/j.physletb.2024.139016","url":null,"abstract":"<div>Sapce-borne gravitational wave antennas, such as LISA and LISA-like mission (Taiji and Tianqin), will offer novel perspectives for exploring our Universe while introduce new challenges, especially in data analysis. Aside from the known challenges like high parameter space dimension, superposition of large number of signals etc., gravitational wave detections in space would be more seriously affected by anomalies or non-stationarities in the science measurements. Considering the three types of foreseeable non-stationarities including data gaps, transients (glitches), and time-varying noise auto-correlations, which may come from routine maintenance or unexpected disturbances during science operations, we developed a deep learning model for accurate signal extractions confronted with such anomalous scenarios. Our model exhibits the same performance as the current state-of-the-art models do for the ideal and anomaly free scenario, while shows remarkable adaptability in extractions of coalescing massive black hole binary signal against all three types of non-stationarities and even their mixtures. This also provide new explorations into the robustness studies of deep learning models for data processing in space-borne gravitational wave missions.</div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005744/pdfft?md5=941c76cac9bdafce79b5eadba0fd1211&pid=1-s2.0-S0370269324005744-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Can millicharge be probed at future Super Tau Charm Facility via mono-π0 searches? 在未来的超级头魅力设施中，能否通过单π0搜索探测到毫卡？

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-11 DOI: 10.1016/j.physletb.2024.139008

{"title":"Can millicharge be probed at future Super Tau Charm Facility via mono-π0 searches?","authors":"","doi":"10.1016/j.physletb.2024.139008","DOIUrl":"10.1016/j.physletb.2024.139008","url":null,"abstract":"<div>We propose a new channel to search for millicharged particles at the future Super Tau Charm Facility (STCF) via mono-<math><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></math> signature. For the first time, we compute the mono-<math><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></math> signal events at the future STCF due to millicharged particle production, as well as due to standard model irreducible/reducible backgrounds. By utilizing the assumed 20 ab−1 luminosity for each running energy with <math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>2</mn></math> GeV, 4 GeV and 7 GeV, we derive the corresponding upper limits on millicharge, respectively. Via mono-<math><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></math> searches at the future STCF with <math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>2</mn></math> GeV, the upper limits on millicharge can be improved than ArgoNeuT when the mass of millicharged particle is less than about 500 MeV, but are not very competitive compared to a latest derivation from a past BEBC experiment and a new SENSEI experiment. Regardless, the mono-<math><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup></math> searches could be an important complement to investigate the invisible particles, such as dark matter.</div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005665/pdfft?md5=1d2f6a56c8da860a1c5876cac6faf509&pid=1-s2.0-S0370269324005665-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142246890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Influence of thermal bath on Pancharatnam-Berry phase in an accelerated frame 热浴对加速框架中潘查拉特南-浆果相的影响

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-11 DOI: 10.1016/j.physletb.2024.139015

引用次数: 0

Observation of near-scission “polar” and “equatorial” proton emission in heavy-ion induced fission 观测重离子诱导裂变中质子的近裂变 "极 "和 "赤道 "发射

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-11 DOI: 10.1016/j.physletb.2024.139014

{"title":"Observation of near-scission “polar” and “equatorial” proton emission in heavy-ion induced fission","authors":"","doi":"10.1016/j.physletb.2024.139014","DOIUrl":"10.1016/j.physletb.2024.139014","url":null,"abstract":"<div>Proton and α-particle energy spectra were measured in coincidence with fission fragments at different relative angles in 16O (96 MeV) + 232Th reaction. The multiplicity spectra were analyzed within the framework of a Moving Source Disentangling Analysis (MSDA) to determine contributions from different emission stages. The MSDA conclusively shows “Near Scission Emission (NSE)” as an essential component in the multiplicity spectra. In contrast to NSE α particles which emit mainly perpendicular (“equatorial emission”), the NSE protons are observed to be emitted perpendicular as well as parallel (“polar emission”) to the fission axis with similar intensities (~20% for each). Thus, around 40% of total pre-scission protons are emitted near the scission stage, whereas the same fraction for α particles is only around 10%. The inevitable presence of “polar” and “equatorial” NSE protons in a heavy-ion induced fission has been observed for the first time. Present results open up a new avenue to study the heavy-ion induced fission dynamics.</div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005720/pdfft?md5=5f43a9eca3aee81267bf01eabcc1c99c&pid=1-s2.0-S0370269324005720-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142240554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Search for pair production of boosted Higgs bosons via vector-boson fusion in the bb¯bb¯ final state using pp collisions at s=13TeV with the ATLAS detector 利用 ATLAS 探测器在[式略]进行的 pp 对撞，在[式略]终态中通过矢量玻色子聚变搜索助推希格斯玻色子的成对产生

IF 4.3 2区物理与天体物理

Physics Letters B Pub Date : 2024-09-11 DOI: 10.1016/j.physletb.2024.139007

{"title":"Search for pair production of boosted Higgs bosons via vector-boson fusion in the bb¯bb¯ final state using pp collisions at s=13TeV with the ATLAS detector","authors":"","doi":"10.1016/j.physletb.2024.139007","DOIUrl":"10.1016/j.physletb.2024.139007","url":null,"abstract":"<div>A search for Higgs boson pair production via vector-boson fusion is performed in the Lorentz-boosted regime, where a Higgs boson candidate is reconstructed as a single large-radius jet, using 140 fb−1 of proton–proton collision data at <math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>13</mn></math> TeV recorded by the ATLAS detector at the Large Hadron Collider. Only Higgs boson decays into bottom quark pairs are considered. The search is particularly sensitive to the quartic coupling between two vector bosons and two Higgs bosons relative to its Standard Model prediction, <math><msub><mrow><mi>κ</mi></mrow><mrow><mn>2</mn><mi>V</mi></mrow></msub></math>. This study constrains <math><msub><mrow><mi>κ</mi></mrow><mrow><mn>2</mn><mi>V</mi></mrow></msub></math> to <math><mn>0.55</mn><mo><</mo><msub><mrow><mi>κ</mi></mrow><mrow><mn>2</mn><mi>V</mi></mrow></msub><mo><</mo><mn>1.49</mn></math> at the 95% confidence level. The value <math><msub><mrow><mi>κ</mi></mrow><mrow><mn>2</mn><mi>V</mi></mrow></msub><mo>=</mo><mn>0</mn></math> is excluded with a significance of 3.8 standard deviations with other Higgs boson couplings fixed to their Standard Model values. A search for new heavy spin-0 resonances that would mediate Higgs boson pair production via vector-boson fusion is carried out in the mass range of 1–5 TeV for the first time under several model and decay-width assumptions. No significant deviation from the Standard Model hypothesis is observed and exclusion limits at the 95% confidence level are derived.</div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005653/pdfft?md5=331ab261eb23f707887e310c3c632180&pid=1-s2.0-S0370269324005653-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142246815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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