The European Physical Journal Special Topics最新文献_第10页

Assessing lepton flavor universality violations in semileptonic decays 评估半轻子衰变中的轻子味道普遍性违规行为

The European Physical Journal Special Topics Pub Date : 2024-07-12 DOI: 10.1140/epjs/s11734-024-01239-7

Sonali Patnaik, Lopamudra Nayak, Rajeev Singh

{"title":"Assessing lepton flavor universality violations in semileptonic decays","authors":"Sonali Patnaik, Lopamudra Nayak, Rajeev Singh","doi":"10.1140/epjs/s11734-024-01239-7","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01239-7","url":null,"abstract":"In light of recent measurements suggesting potential lepton flavor universality violations in semileptonic decays at collider experiments, this article provides a concise study of tree- and loop-level B-hadron semileptonic decays, (b rightarrow c l nu _l) and (b rightarrow s l^+ l^-). We provide predictions for lepton flavor violating observables, ({mathcal {R}}_{J/psi }) and ({mathcal {R}}_{eta _c}), across the entire (q^2) range. Our study employs the Relativistic Independent Quark Model (RIQM), highlighting a model-dependent approach to these observables. We compare our model’s predictions with existing lattice predictions, demonstrating the strong applicability of the RIQM framework in describing (B_c) decays. Additionally, we reassess global averages for ({mathcal {R}}_{D(D^*)}) and ({mathcal {R}}_{K(K^*)}) in semileptonic transitions. With the upcoming experimental upgrades and the anticipated Run 3 data on (B_c) meson decays, rapid confirmation of these quantities could indicate significant evidence of physics beyond the Standard Model, thereby opening new pathways for understanding the complex flavor dynamics in B meson decays.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141615073","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

To the effect of interparticle interaction on dynamic remagnetization of ferromagnetic nanoparticles 颗粒间相互作用对铁磁性纳米颗粒动态再磁化的影响

The European Physical Journal Special Topics Pub Date : 2024-07-11 DOI: 10.1140/epjs/s11734-024-01225-z

A. Yu. Zubarev, L. Yu. Iskakova

引用次数: 0

Non-fragile tracking controller design for fractional order systems against active disturbance rejection 针对主动干扰抑制的分数阶系统的非脆弱跟踪控制器设计

The European Physical Journal Special Topics Pub Date : 2024-07-10 DOI: 10.1140/epjs/s11734-024-01217-z

S. Arivumani, P. Vadivel, G. Rajchakit, T. Saravanakumar

{"title":"Non-fragile tracking controller design for fractional order systems against active disturbance rejection","authors":"S. Arivumani, P. Vadivel, G. Rajchakit, T. Saravanakumar","doi":"10.1140/epjs/s11734-024-01217-z","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01217-z","url":null,"abstract":"In this work, a new non-fragile based tracking controller design for fractional order systems with non-linear uncertainty, unidentified external disturbances, and time-delay is investigated. A novel structure of a fractional order non-fragile repetitive controller is suggested to obtain the tracking performance for the addressed system. In particular, gain fluctuations are used with an improved two-degrees-of-freedom Smith predictor in the construction of this structure. Using the Lyapunov–Krasovskii stability theory and a continuous amplitude distributed equivalent system, a new set of criteria to determine the asymptotic stability of the associated closed-loop system is proposed in the context of linear matrix inequalities. Within a single framework, disturbance estimation, asymptotic tracking, and time delay compensation are all done using the obtained stability results. The resulting theoretical results are finally confirmed by numerical examples that demonstrate how the specified constraints could lead the system output to precisely match any defined reference signal by balancing for the unidentified exterior disturbance.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141585784","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 fractional mathematical model for vaccinated humans with the impairment of Monkeypox transmission 接种过猴痘疫苗的人类传播能力受损的分数数学模型

The European Physical Journal Special Topics Pub Date : 2024-07-10 DOI: 10.1140/epjs/s11734-024-01211-5

A. Venkatesh, M. Manivel, K. Arunkumar, M. Prakash Raj, Shyamsunder, S. D. Purohit

引用次数: 0

Primordial nucleosynthesis with non-extensive statistics 非广延性统计的原始核合成

The European Physical Journal Special Topics Pub Date : 2024-07-09 DOI: 10.1140/epjs/s11734-024-01216-0

C. A. Bertulani, Shubhchintak

{"title":"Primordial nucleosynthesis with non-extensive statistics","authors":"C. A. Bertulani, Shubhchintak","doi":"10.1140/epjs/s11734-024-01216-0","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01216-0","url":null,"abstract":"The conventional Big Bang model successfully anticipates the initial abundances of (^2)H(D), (^3)He, and (^4)He, aligning remarkably well with observational data. However, a persistent challenge arises in the case of (^7)Li, where the predicted abundance exceeds observations by a factor of approximately three. Despite numerous efforts employing traditional nuclear physics to address this incongruity over the years, the enigma surrounding the lithium anomaly endures. In this context, we embark on an exploration of Big Bang nucleosynthesis (BBN) of light element abundances with the application of Tsallis non-extensive statistics. A comparison is made between the outcomes obtained by varying the non-extensive parameter q away from its unity value and both observational data and abundance predictions derived from the conventional big bang model. A good agreement is found for the abundances of (^4)He, (^3)He and (^7)Li, implying that the lithium abundance puzzle might be due to a subtle fine-tuning of the physics ingredients used to determine the BBN. However, the deuterium abundance deviates from observations.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141566592","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

Unsupervised and lightly supervised learning in particle physics 粒子物理学中的无监督和轻监督学习

The European Physical Journal Special Topics Pub Date : 2024-07-08 DOI: 10.1140/epjs/s11734-024-01235-x

Jai Bardhan, Tanumoy Mandal, Subhadip Mitra, Cyrin Neeraj, Monalisa Patra

引用次数: 0

Complex dynamics of a fractional-order delayed epidemic model incorporating waning immunity and optimal control 包含免疫力减弱和优化控制的分数阶延迟流行病模型的复杂动力学

The European Physical Journal Special Topics Pub Date : 2024-07-08 DOI: 10.1140/epjs/s11734-024-01221-3

Suvankar Majee, Soovoojeet Jana, T. K. Kar, Bidhan Bhunia

引用次数: 0

How deep learning is complementing deep thinking in ATLAS 深度学习如何与 ATLAS 的深度思考相辅相成

The European Physical Journal Special Topics Pub Date : 2024-07-05 DOI: 10.1140/epjs/s11734-024-01238-8

Deepak Kar

引用次数: 0

A robust study of the dynamics of tumor–immune interaction for public health via fractional framework 通过分数框架对肿瘤-免疫相互作用动态进行稳健研究，促进公共健康

The European Physical Journal Special Topics Pub Date : 2024-07-05 DOI: 10.1140/epjs/s11734-024-01210-6

Meshal Shutaywi, Zahir Shah, Rashid Jan

{"title":"A robust study of the dynamics of tumor–immune interaction for public health via fractional framework","authors":"Meshal Shutaywi, Zahir Shah, Rashid Jan","doi":"10.1140/epjs/s11734-024-01210-6","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01210-6","url":null,"abstract":"It is evident that a tumor is a dangerous lump of tissue developed through the uncontrollable division of cells, replacing healthy tissue with abnormal tissue. It is cancerous and spreads through the lymphatic system or blood within the body of a host individual while the human immune system, consisting of interrelated special cells, tissues, and organs, is employed for the protection of the body from microorganisms, foreign diseases, infections, and toxins. Thus, the conceptualization and understanding of the intersections of tumor–immune cells are valuable. In this article, the natural process of tumor–immune cell interactions is formulated through a mathematical framework. The intricate dynamics of tumor–immune interactions are then represented by means of operators of fractional calculus involving nonlocal and nonsingular kernels. The definitions and basic properties of non-integer derivatives are introduced for the investigation of the proposed system. In addition, a new numerical scheme is introduced for the dynamics, showing the chaos and oscillation of the tumor–immune system. The proposed dynamics of tumor–immune interaction are highlighted with the effect of different input factors. Our findings not only contribute to a thorough comprehension of the complex interactions between input parameters and tumor dynamics, but critical factors that have a major impact on the dynamics are also identified. These outcomes are pivotal for refining and optimizing the proposed system to enhance its predictive accuracy and efficacy in modeling tumor behavior.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"134 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548963","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

Dynamics of crystals in metastable liquids with applications to the growth of polypeptide hormones 晶体在易变质液体中的动力学及其在多肽激素生长中的应用

The European Physical Journal Special Topics Pub Date : 2024-07-04 DOI: 10.1140/epjs/s11734-024-01226-y

Dmitri V. Alexandrov, Alexander A. Ivanov, Irina V. Alexandrova, Eugenya V. Makoveeva

{"title":"Dynamics of crystals in metastable liquids with applications to the growth of polypeptide hormones","authors":"Dmitri V. Alexandrov, Alexander A. Ivanov, Irina V. Alexandrova, Eugenya V. Makoveeva","doi":"10.1140/epjs/s11734-024-01226-y","DOIUrl":"https://doi.org/10.1140/epjs/s11734-024-01226-y","url":null,"abstract":"This study is concerned with the dynamics of a polydisperse ensemble of crystals in a single-component metastable solution/melt. A new theory based on the kinetic and balance equations is developed for the description of initial and intermediate stages of bulk crystallization. Such phenomena as unsteady growth rates of individual crystals with fluctuations, diffusion of the crystal-size distribution function in the space of particle radii, the Gibbs–Thomson and atomic kinetics effects, various crystal nucleation mechanisms are taken into account. The analytical solution is constructed in a parametric form with the modified time being the decision variable. Namely, the metastability degree, particle-radius distribution function, crystallization time, total number of crystals and their mean size are found as the functions of decision variable. The analytical solutions show that the metastability degree decreases with time as a result of liquid desupersaturation/desupercooling. As this takes place, the particle-radius distribution function moves to greater particle radii, becomes wider and lower with increasing the crystallization time. The theory is tested against experiments on the growth of such polypeptide hormones as porcine and bovine insulins. We show that the theory is in good agreement with the experimental data.","PeriodicalId":501403,"journal":{"name":"The European Physical Journal Special Topics","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141548968","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