The European Physical Journal C最新文献_第8页

Estimation of ( H_0 ) and ( r_d ) in the (omega (z)) parameterization within Einstein and Horava–Lifshitz gravity using DESI-Y1 and SDSS-IV

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-31 DOI: 10.1140/epjc/s10052-025-14056-6

Ujjal Debnath, Himanshu Chaudhary, Niyaz Uddin Molla, S. K. J. Pacif, G. Mustafa

{"title":"Estimation of ( H_0 ) and ( r_d ) in the (omega (z)) parameterization within Einstein and Horava–Lifshitz gravity using DESI-Y1 and SDSS-IV","authors":"Ujjal Debnath, Himanshu Chaudhary, Niyaz Uddin Molla, S. K. J. Pacif, G. Mustafa","doi":"10.1140/epjc/s10052-025-14056-6","DOIUrl":"10.1140/epjc/s10052-025-14056-6","url":null,"abstract":"<div>We propose a novel dynamical dark energy model within the frameworks of Einstein gravity and Horava–Lifshitz gravity, utilizing the DCMPM parametrization of the dark energy equation of state to derive the Hubble parameter. We keep ( r_d ) as a free parameter, and use different cosmological datasets such as cosmic chronometer measurements, Type Ia Supernovae observations, and Baryon Acoustic Oscillation data from DESI Y1 and SDSS-IV to extract the posterior distributions of each model parameters. Furthermore, we investigate the evolution of the Universe using various cosmographic parameters and conduct diagnostic analyses, including the statefinder and ( O_m ) diagnostics. Using various statistical metrics, we compare both models against the standard (Lambda )CDM model and find that all are well-supported by current data. Notably, the DCMPM parameterization within Einstein gravity emerges as a promising extension to the standard (Lambda )CDM framework.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14056-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740820","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

Investigating the glueball-like particle X(2370) in B meson decays

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-31 DOI: 10.1140/epjc/s10052-025-13874-y

Xiao-Tong Li, Guang-Yu Wang, Qi-An Zhang

{"title":"Investigating the glueball-like particle X(2370) in B meson decays","authors":"Xiao-Tong Li, Guang-Yu Wang, Qi-An Zhang","doi":"10.1140/epjc/s10052-025-13874-y","DOIUrl":"10.1140/epjc/s10052-025-13874-y","url":null,"abstract":"<div>Based on the collected data on (J/psi rightarrow gamma K_S^0K_S^0eta '), the Beijing Spectrometer (BESIII) experiment has conducted an analysis of the mass and spin parity of the X(2370) particle. The findings areconsistent with the characteristics expected of the lightest pseudoscalar glueball. We point out that further exploration of this particle’s nature can be pursued through investigations of heavy bottom meson decays. Assuming the identity of X(2370) as a pseudoscalar glueball, we compute the form factors for (Brightarrow X(2370)) transitions in the factorization approach. With these results, the estimated branching fractions for semileptonic B decays into X(2370) can reach the order of (10^{-6}) and those for nonleptonic decays can reach the order (10^{-8}). These results suggest that decays of B mesons into X(2370) are detectable at experimental facilities like Belle-II. Future experimental endeavors hold promise in expanding our understanding of glueball physics, contributing to the ongoing exploration of this intriguing particle.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13874-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740819","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

Interplay of intrinsic motion of partons and soft gluon emissions in Drell–Yan production studied with PYTHIA

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-30 DOI: 10.1140/epjc/s10052-025-14066-4

I. Bubanja, H. Jung, N. Raičević, S. Taheri Monfared

{"title":"Interplay of intrinsic motion of partons and soft gluon emissions in Drell–Yan production studied with PYTHIA","authors":"I. Bubanja, H. Jung, N. Raičević, S. Taheri Monfared","doi":"10.1140/epjc/s10052-025-14066-4","DOIUrl":"10.1140/epjc/s10052-025-14066-4","url":null,"abstract":"<div>Understanding the intrinsic transverse momentum (intrinsic-(k_textrm{T})) of partons within colliding hadrons, typically modeled with a Gaussian distribution characterized by a specific width (the intrinsic-(k_textrm{T})width), has been an extremely challenging issue. This difficulty arises because event generators like Pythia8 require an intrinsic-(k_textrm{T}) width that unexpectedly varies with collision energy, reaching unphysical values at high energies. This paper investigates the underlying physics behind this energy dependence in Pythia8, revealing that it arises from an interplay between two non-perturbative processes: the internal transverse motion of partons and non-perturbative soft gluon emissions. These contributions are most constrained in the production of Drell–Yan pairs with very low transverse momentum, where soft gluon effects become increasingly prominent with rising collision energy-contrary to initial expectations. Through a detailed analysis of the Sudakov form factor and its influence on intrinsic-(k_textrm{T}) width, we clarify the observed energy scaling behavior in Pythia8, providing insight into a longstanding issue in parton shower modeling.\u0000\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14066-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143740774","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

The Einstein Telescope standard siren simulations for f(Q) cosmologies

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-29 DOI: 10.1140/epjc/s10052-025-14077-1

Xianfu Su, Dongze He, Yi Zhang

引用次数: 0

Deuteron gravitational form factors, generalized parton distributions, and charge density in the framework of the soft-wall AdS/QCD model

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-29 DOI: 10.1140/epjc/s10052-025-14063-7

Shahin Mamedov, Minaya Allahverdiyeva, Narmin Akbarova

引用次数: 0

Universal thermodynamic topological classes of black holes in a perfect fluid dark matter background

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-29 DOI: 10.1140/epjc/s10052-025-14070-8

Muhammad Rizwan, Mubasher Jamil, M. Z. A. Moughal

{"title":"Universal thermodynamic topological classes of black holes in a perfect fluid dark matter background","authors":"Muhammad Rizwan, Mubasher Jamil, M. Z. A. Moughal","doi":"10.1140/epjc/s10052-025-14070-8","DOIUrl":"10.1140/epjc/s10052-025-14070-8","url":null,"abstract":"<div>In this paper, we study the universal thermodynamic topological classes of a family of black holes in a perfect fluid dark matter (PFDM) background. Recent research on black hole thermodynamics suggests that all black holes can be cast into four universal thermodynamic classes, denoted by (W^{1-}), (W^{0+}), (W^{0-}), and (W^{1+}). Our study reveals that the Schwarzschild black hole in PFDM belongs to the (W^{1-}) class, and the independence of black hole size is thermodynamically unstable in both the low- and high-temperature limits. The Reissner–Nordström, Kerr, and Kerr–Newman black holes in the PFDM background belong to the same universal thermodynamic class, (W^{0+}), which represents small-stable black holes and large-unstable black holes at low-temperature limits, whereas no black hole state exists at high temperatures. The AdS black holes behave differently when compared to their counterparts in PFDM. The Schwarzschild–AdS black hole belongs to the (W^{0-}) class, indicating that no black hole state exists at low temperatures, but small-unstable and large-stable black hole states exist at high temperatures. Furthermore, the Kerr–AdS black hole belongs to the (W^{1+}) class, characterized by small-stable black holes at low temperatures, large-stable black holes at high temperatures, and unstable intermediate-sized black holes at both low and high temperatures. Thus, the presence of PFDM does not affect the stability of the black hole. These findings uncover the universal topological classifications underlying black hole thermodynamics, offering profound insights into the fundamental principles of quantum gravity.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14070-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726706","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

Proton spin in double-logarithmic approximation

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-29 DOI: 10.1140/epjc/s10052-025-14067-3

B. I. Ermolaev

{"title":"Proton spin in double-logarithmic approximation","authors":"B. I. Ermolaev","doi":"10.1140/epjc/s10052-025-14067-3","DOIUrl":"10.1140/epjc/s10052-025-14067-3","url":null,"abstract":"<div>Proton is a composite particle, so its spin (S_P) is made from the spins of the partons which the proton consists of the discrepancy between (S_P= 1/2) and the experimentally detected sum of the parton spins was named Proton Spin Puzzle. Solution to this problem includes formulae for the parton helicities valid in the whole range of x. There are approaches in the literature for calculating the helicities. As a theoretical basis they apply evolution equations of different types. Despite these equations are constructed for operating in widely different regions of x and account for different contributions, all of them equally well suited for solving the proton spin problem. Our explanation of this situation is that the main impact on values of the parton spin contributions should be brought not by the evolution equations themselves but by phenomenological fits for initial parton distributions. We suggest a more theoretically grounded approach to description of the parton helicities and apply it to solving the proton spin problem. It combines the total resummation of double logarithms (DL), accounting for the running (alpha _s) effects and DGLAP formulae, leading to expressions for the helicities valid at arbitrary x. As a consequence, the set of involved phenomenological parameters in our approach is minimal and its influence on the helicity behaviour is weak. We apply our approach to solve the proton spin problem in a straightforward way and make an estimate, demonstrating that the RHIC data complemented by the DL contributions from the regions of x beyond the RHIC scope are well compatible with the value (S_P = 1/2).\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14067-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735383","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

The mixed phase quark core in massive hybrid stars

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-29 DOI: 10.1140/epjc/s10052-025-14088-y

Xuhao Wu, Peng-Cheng Chu, Min Ju, He Liu

{"title":"The mixed phase quark core in massive hybrid stars","authors":"Xuhao Wu, Peng-Cheng Chu, Min Ju, He Liu","doi":"10.1140/epjc/s10052-025-14088-y","DOIUrl":"10.1140/epjc/s10052-025-14088-y","url":null,"abstract":"<div>We investigate the properties of hybrid star and the mixed phase core to explore the radius ratio of the mixed phase in hybrid star. In the context of observed massive neutron stars (NSs), we examine the internal structure, phase transitions, and the impacts of the equation of state (EOS) in maximum hybrid star. We investigate the stiffness changes in the EOS during the hadron-quark phase transition within the hybrid stars. The relativistic mean-field (RMF) model is used to describe hadronic matter, while to the represent quark matter, the Nambu–Jona–Lasinio (NJL) model is applied. We explore the strength of vector coupling in quark matter, which delays the onset density of the mixed phase and reduces the size of the mixed-phase core in a hybrid star, but does not exhibit a clear correlation with the central density. In a hybrid star with a maximum mass of approximately 2 solar masses ((M_odot )), a mixed-phase core of (sim ) 5 km may exist, comprising about (40%) of the total radius. However, our results do not support the existence of a sizable quark core containing the mixed phase ((R_mathrm{{MP}}>1/2~R_mathrm{{total}})) for the maximum-mass hybrid star or for a 2 (M_odot ) massive star.\u0000</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14088-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735384","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

Frozen Bardeen-Dirac stars and light ball

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-28 DOI: 10.1140/epjc/s10052-025-13929-0

Long-Xing Huang, Shi-Xian Sun, Yong-Qiang Wang

{"title":"Frozen Bardeen-Dirac stars and light ball","authors":"Long-Xing Huang, Shi-Xian Sun, Yong-Qiang Wang","doi":"10.1140/epjc/s10052-025-13929-0","DOIUrl":"10.1140/epjc/s10052-025-13929-0","url":null,"abstract":"<div>In this paper, we study solutions of a static spherically symmetric system, which is composed of the coupling with the Bardeen action and two Dirac fields. For the case where only the Bardeen action is present, the magnetic charge q can be infinite, then when the magnetic charge is greater than a certain value (q_b), there exists a black hole solution, which is called the Bardeen black hole (BBH). However, if the Dirac field is introduced, we find that the magnetic charge can only be smaller than the critical value (q_b), in which there is no black hole solution. Moreover, in the region (q<q_b), we find that if the magnetic charge exceeds another critical value (q_c) (i.e., (q_c<q<q_b)), the frequency of the Dirac field can approach zero, and the solution where a critical horizon appears is similar to an extremal black hole outside the critical horizon but has a nonsingular interior. The Dirac fields are also almost concentrated within it. In fact, this is a frozen star solution, we call such solutions frozen Bardeen-Dirac stars (FBDSs). We analyze the light rings of FBDSs and find that there exists a “true” light ring outside the critical horizon, but inside it, the velocity of photons is very close to zero, which leads to the formation of a “light ball” inside the critical horizon.</div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 3","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13929-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143726697","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

Genuine four-partite Bell nonlocality in the curved spacetime

IF 4.2 2区物理与天体物理

The European Physical Journal C Pub Date : 2025-03-28 DOI: 10.1140/epjc/s10052-025-14076-2

Guang-Wei Mi, Xiaofen Huang, Shao-Ming Fei, Tinggui Zhang

引用次数: 0