中国物理C最新文献

{"title":"Jet modification in absence of QGP-medium: the role of multiparton interactions and color reconnection","authors":"Prottoy Das, Abhi Modak, Debjani Banerjee, Rathijit Biswas, Supriya Das, Sanjay Kumar Ghosh, Sibaji Raha, Sidharth Kumar Prasad","doi":"10.1088/1674-1137/ad0b6c","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0b6c","url":null,"abstract":"Abstract Recent studies of high-multiplicity events in small collision systems (proton-proton and proton-lead) have drawn research interest towards the possibility of the formation of partonic medium in such systems. One of the important consequences of the formation of dense partonic medium is quenching of high-momentum final-state particles resulting in several experimental observations such as suppression in nuclear modification factor $R_{rm AA}$, modification of jet shape observable $rho(r)$ and jet fragmentation ($z^{rm ch}$) distributions, etc. In this work, we study $rho(r)$ and $z^{rm ch}$ for inclusive charged-particle jets in proton-proton (pp) collisions at $sqrt{s}$~=~13~TeV using PYTHIA~8 Monash~2013 Monte Carlo simulation. We show that the color reconnection (CR) and multiparton interaction (MPI) mechanisms in PYTHIA~8 can lead to an increased rate of jet production. We also find that the mechanisms of MPI and CR and change in the gluonic contribution in high-multiplicity events result in significant modification of $rho(r)$ and $z^{rm ch}$ compared to those in minimum bias events for 10~$<p_{rm T,,jet}^{rm ch}<$~20~GeV/$c$. We notice a direct connection of $langle N_{rm MPI}rangle$ and gluonic contribution with the amount of modification in $rho(r)$ -- the larger the number of MPIs and/or gluonic contribution, the larger the amount of modification of $rho(r)$. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"11 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Further monopole effects in neutron-rich Sb isotopes","authors":"Han Kui Wang, Yule Sun, bowen Jiang, Feifan Zeng, Minliang Liu","doi":"10.1088/1674-1137/ad0b6b","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0b6b","url":null,"abstract":"Abstract The level spectra of neutron-rich Sb isotopes have been investigated within a shell-model space containing cross-shell excitations and the intruder orbit $i_{13/2}$.&amp;#xD;High-spin levels (27/2$^-$) and (29/2$^-$) in $^{135}$Sb are taken over by monopole effect induced by the orbit $i_{13/2}$.&amp;#xD;The ground state and excited levels in $^{136}$Sb are well improved by considering monopole correction between neutron orbits $f_{7/2}$ and $h_{9/2}$.&amp;#xD;The energy shrinking of the first excited state 5/2$^+$ in $^{135,137}$Sb isotopes is explained by&amp;#xD;the $pi d_{5/2}$ shift due to the attractive $pi d_{5/2} nu f_{7/2}$ monopole interaction when more and more neutrons occupy the orbit $f_{7/2}$.&amp;#xD;The ground state of $^{139}$Sb is predicted as 5/2$^+$: due to the shrinking of states 5/2$^+$ in Sb isotopes that causes ground state inversion when N = 88.&amp;#xD;These further monopole effects extend the applicable range of present Hamiltonian to nuclei with more neutrons above N = 82 shell.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"19 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135092542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal analysis and Joule-Thomson expansion of black hole exhibiting metric-affine gravity","authors":"Muhammad Yasir, Xia Tie Cheng, Faisal Javed, Ghulam Mustafa","doi":"10.1088/1674-1137/ad0962","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0962","url":null,"abstract":"Abstract This study examines a recently hypothesized black hole, which is a perfect solution of metric-affine gravity with a positive cosmological constant, and its thermodynamic features as well as the Joule-Thomson expansion. We develop some thermodynamical quantities, such as volume, Gibbs free energy, and heat capacity, using the entropy and Hawking temperature. We also examine the first law of thermodynamics and thermal fluctuations, which might eliminate certain black hole instabilities. In this regard, a phase transition from unstable to stable is conceivable when the first law order corrections are present. Besides that, we study the efficiency of this system as a heat engine and the effect of metric-affine gravity for physical parameters $q_e$, $q_m$, $kappa_{mathrm{s}}$, $kappa_{mathrm{d}}$ and $kappa_{mathrm{sh}}$. Further, we study the Joule-Thomson coefficient, and the inversion temperature and also observed the isenthalpic curves in the $T_i -P_i$ plane. In metric-affine gravity, a comparison is made between the Van der Waals fluid and the black hole to study their similarities and differences.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"27 115","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135820862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phantom cosmologies from the simplest parameterization of the DE model using observational data in a BI type universe","authors":"H. Hossienkhani, F. Mahmoodi, V. Fayaz, S.A.A. Terohid, N. Azimi, Z. Zarei","doi":"10.1088/1674-1137/acf2fb","DOIUrl":"https://doi.org/10.1088/1674-1137/acf2fb","url":null,"abstract":"Abstract To scrutinize the nature of dark energy, many equations of state have been proposed. In this context, we examine the simplest parameterization of the equation of state parameter of dark energy in an anisotropic Bianchi type I universe compared with the ΛCDM model. Using different combinations of data samples, including Pantheon and Pantheon + H ( z ), alongside applying the minimization of the <?CDATA $ chi^2 $?> function of the distance modulus of data samples, we obtain the constrained values of cosmographic parameters in the parameterization of the dark energy scenario. One condition of the phantom barrier crossing is acquired. Several physical properties of the universe are discussed by considering the anisotropy effect and different observational data points. One should note that the deductions of the cosmological parameter verify recent observational data.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"47 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136372517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermodynamics under the impact of thermal fluctuations and quasi-normal modes of Euler-Heisenberg AdS BH in the framework of NLED","authors":"R. H. Ali, G. Abbas","doi":"10.1088/1674-1137/acf2fc","DOIUrl":"https://doi.org/10.1088/1674-1137/acf2fc","url":null,"abstract":"Abstract We study the impact of thermal fluctuations on the thermodynamics, quasi-normal modes, and phase transitions of an anti-de Sitter Euler-Heisenberg black hole (BH) with a nonlinear electrodynamic field. An anti-de Sitter Euler-Heisenberg BH with a nonlinear electrodynamic field is composed of four parameters: the mass, electric charge, cosmological constant, and Euler-Heisenberg parameter. We calculate thermodynamic variables such as Hawking temperature, entropy, volume, and specific heat, which comply with the first law of thermodynamics. First, we use this BH to determine the thermodynamics and thermal fluctuations with the Euler-Heisenberg parameter to distinguish their effect on uncorrected and corrected thermodynamical quantities. We derive the expression for corrected entropy to study the impact of thermal fluctuation with simple logarithmic corrections on unmodified thermodynamical potentials, including Helmholtz energy, pressure, Gibbs free energy, and enthalpy. The Euler-Heisenberg parameter improves BH stability at large radii. Second, we analyze the local stability of the proposed BH, and the phase shifts of the BH are also investigated using temperature and specific heat. When there is a decrease in charge and an increase in <?CDATA $ r_{+} $?> and α , the temperature shifts from an unstable region to a stable one. Similarly, increases in local stability are observed with each of these parameters. Third, we use null geodesics to deal with the effects of nonlinear electrodynamics on the quasi-normal modes of the Euler-Heisenberg anti-de Sitter BH. The null geodesics provide the angular velocity and Lyapunov exponent of the photon sphere, which are the same as the real and imaginary parts of the quasi-normal modes in the eikonal limit.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"8 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135111757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical predictions on cluster radioactivity of superheavy nuclei with Z=119, 120","authors":"Jiejie Liu, Zhen Wang, hantao zhang, Zhong-Zhou Ren","doi":"10.1088/1674-1137/ad0827","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0827","url":null,"abstract":"In this work we investigate cluster radioactivity (CR) of new superheavy elements with $Z=119$ and 120 based on two successful theoretical methods with modified parameters, the density-dependent cluster model (DDCM) and the unified decay formula (UDF). Firstly we employ the DDCM and UDF to accurately reproduce the experimental half-lives of cluster emissions, which demonstrates high reliability of our theoretical methods. Then we systematically predict probable cluster modes of $^{293-311}$119 and $^{293-302}$120 as well as their corresponding decay energies and half-lives. The half-lives of cluster decay derived from DDCM are consistent with those from UDF. As a result, our results reveal that the cluster emission of $^{8}$Be, emitted from the $Z=$119 and 120 isotopic chains, exhibits the minimum half-life for cluster emission, thereby $^{8}$Be emission is considered as the most probable cluster decay mode. Moreover, we explore the competition between $alpha$ decay and CR and find that $alpha$ decay may be the dominant decay mode against CR. Furthermore, a good linear relationship between the decay energy and the number of $alpha$ particles within the emitted cluster is extended to range of superheavy nuclei (SHN). We anticipate that our theoretical predictions for CR will provide valuable references for the experimental synthesis of new SHN.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"12 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135872383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantum calculation of axion-photon transition in electromagnetodynamics for cavity haloscope","authors":"Tong Li, Rui-Jia Zhang","doi":"10.1088/1674-1137/ad0620","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0620","url":null,"abstract":"Abstract The Witten effect implies the presence of electric charge of magnetic monople and the possible relationship between axion and dyon. The axion-dyon dynamics can be reliably built based on the quantum electromagnetodynamics (QEMD) which was developed by Schwinger and Zwanziger in 1960's.&amp;#xD;A generic low-energy axion-photon effective field theory can also be realized in the language of ``generalized symmetries'' with higher-form symmetries and background gauge fields.&amp;#xD;In this work, we implement the quantum calculation of the axion-single photon transition rate inside a homogeneous electromagnetic field in terms of the new axion interaction Hamiltonian in QEMD. This quantum calculation can clearly imply the enhancement of conversion rate through resonant cavity in axion haloscope experiments. We also show the promising potentials on the cavity search of new axion-photon couplings. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135265622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Holographic Schwinger effect in spinning black hole backgrounds","authors":"Yi-Ze Cai, Zi-qiang Zhang","doi":"10.1088/1674-1137/ad061f","DOIUrl":"https://doi.org/10.1088/1674-1137/ad061f","url":null,"abstract":"Abstract We perform the potential analysis for the holographic Schwinger&amp;#xD;effect in spinning Myers-Perry black holes. We compute the&amp;#xD;potential between the produced pair by evaluating the classical&amp;#xD;action of a string attaching on a probe D3-brane sitting at an&amp;#xD;intermediate position in the AdS bulk. It turns out that&amp;#xD;increasing the angular momentum reduces the potential barrier thus&amp;#xD;enhancing the Schwinger effect, consistent with previous findings&amp;#xD;obtained from the local Lorentz transformation. In particular,&amp;#xD;these effects are more visible for the particle pair lying in the&amp;#xD;transversal plane compared with that along the longitudinal&amp;#xD;orientation. In addition, we discuss how the Schwinger effect&amp;#xD;changes with the shear viscosity to entropy density ratio at&amp;#xD;strong coupling under the influence of angular momentum.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"38 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135266492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Elastic scattering and total reaction cross sections of $^{6}$Li studied with a microscopic continuum discretized coupled channels model","authors":"Wendi Chen, Dan-Yang 庞丹阳 Pang, Hairui Guo, Tao Ye, Weili Sun, Yangjun Ying","doi":"10.1088/1674-1137/ad0453","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0453","url":null,"abstract":"Abstract We present a systematic study of $^{6}$Li elastic scattering and total reaction cross sections at incident energies around the Coulomb barrier within the continuum discretized coupled-channels (CDCC) framework, where $^{6}$Li is treated in an $alpha$+$d$ two-body model. Collisions with $^{27}$Al, $^{64}$Zn, $^{138}$Ba and $^{208}$Pa are analyzed. The microscopic optical potentials (MOP) based on Skyrme nucleon-nucleon interaction for $alpha$ and $d$ are adopted in CDCC calculations and satisfactory agreement with the experimental data is obtained without any adjustment on MOPs. For comparison, the $alpha$ and $d$ global phenomenological optical potentials (GOP) are also used in CDCC analysis and a reduction no less than 50$%$ on the surface imaginary part of deuteron GOP is required for describing the data. In all cases, the $^6$Li breakup effect is significant and provides repulsive correction to the folding model potential. The reduction on the surface imaginary part of GOP of deuteron reveals a strong suppression of the reaction probability of deuteron as a component of $^{6}$Li as compared with that of a free deuteron. A further investigation is made by taking the $d$ breakup process into account equivalently within the dynamic polarization potential approach and it shows that $d$ behaves like a tightly bound nucleus in $^{6}$Li induced reactions.","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135824090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bethe-Heitler lepton pair production in the deuteron breakup reaction","authors":"Mengchu Cai, Tianbo Liu, Bo-Qiang 马伯强 Ma","doi":"10.1088/1674-1137/ad0375","DOIUrl":"https://doi.org/10.1088/1674-1137/ad0375","url":null,"abstract":"Abstract We study the lepton pair production via the Bethe-Heitler mechanism in the deuteron breakup reaction. The complete seven-fold differential cross section is calculated with final state interactions taken into account. The deuteron bound state is described by a relativistic covariant deuteron-nucleon vertex. With numerical results, we find that the differential cross section has strong dependence on the lepton azimuthal angle in the small polar angle region and sharp peaks appear in the dependence on the invariant mass of the produced lepton pair or the two nucleons in the final state. We demonstrate that such nearly singular feature originates from the collinearity between the produced lepton or antilepton and the incident photon, and it is physically regularized by the lepton mass in our calculation. The final state interaction between the knocked-out nucleon and the recoil nucleon redistributes the differential cross section over the missing momentum, with a significant enhancement at large missing momentum and a suppression in the intermediate region. With a further decomposition of the final state interaction contribution, it is found that the on-shell term dominates the near quasi-elastic region while the off-shell term dominates the other end. In addition, we examine the contribution from the interference between the proton amplitude and the neutron amplitude, which as expected is found negligible even if the proton-neutron rescattering is included. The result in this work can serve as an input for the analysis and background estimation of multiple exclusive measurements at Jefferson Lab and future electron-ion colliders. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd","PeriodicalId":10250,"journal":{"name":"中国物理C","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136078445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}