Journal of Physics G: Nuclear and Particle Physics最新文献

{"title":"Heavy quark energy loss through polarization and radiation in the hot QCD medium","authors":"Jai Prakash, Mohammad Yousuf Jamal","doi":"10.1088/1361-6471/ad10c9","DOIUrl":"https://doi.org/10.1088/1361-6471/ad10c9","url":null,"abstract":"We present a comparative study on the heavy quarks energy loss through medium polarization and gluon radiation in the quark-gluon plasma. To do so, we investigated the energy loss per unit length and drag coefficient for both cases. To have better contrast, we also obtained the nuclear modification factor employing Langevin dynamics. The comparison shows that the polarization effect dominates at lower momentum. The medium temperature also plays an important role in the comparison.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"16 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139093778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Probing beyond the standard model physics with double-beta decays","authors":"Elisabetta Bossio, Matteo Agostini","doi":"10.1088/1361-6471/ad11f9","DOIUrl":"https://doi.org/10.1088/1361-6471/ad11f9","url":null,"abstract":"Nuclear double-beta decays are a unique probe to search for new physics beyond the standard model. Hypothesized particles, non-standard interactions, or the violation of fundamental symmetries would affect the decay kinematics, creating detectable and characteristic experimental signatures. In particular, the energy distribution of the electrons emitted in the decay gives an insight into the decay mechanism and has been studied in several isotopes and experiments. No deviations from the prediction of the standard model have been reported yet. However, several new experiments are underway or in preparation and will soon increase the sensitivity of these beyond-the-standard-model physics searches, exploring uncharted parts of the parameter space. This review brings together phenomenological and experimental aspects related to new-physics searches in double-beta decay experiments, focusing on the testable models, the most-sensitive detection techniques, and the discovery opportunities of this field.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139093733","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Isoscaling in dilute warm nuclear systems","authors":"Alex Rebillard-Soulié, Rémi Bougault, Helena Pais, Bernard Borderie, Abdelouahad Chbihi, Caterina Ciampi, Quentin Fable, John Frankland, Emmanuelle Galichet, Tom Génard, Diégo Gruyer, Nicolas Le Neindre, Ivano Lombardo, Olivier Lopez, Loredana Manduci, Marian Pârlog, Giuseppe Verde","doi":"10.1088/1361-6471/ad0edd","DOIUrl":"https://doi.org/10.1088/1361-6471/ad0edd","url":null,"abstract":"Heavy-ion collisions are a good tool to explore hot nuclear matter below saturation density, <italic toggle=\"yes\">ρ</italic>\u0000₀. It has been established that if a nuclear system reaches the thermal and chemical equilibrium, this leads to scaling properties in the isotope production when comparing two systems which differ in proton fraction. This article presents a study of the isoscaling properties of an expanding gas source exploring different thermodynamic states (density, temperature, proton fraction). This experimental work highlights the existence of an isoscaling relationship for hydrogen and ³He, ⁴He helium isotopes which agrees with the hypothesis of thermal and chemical equilibrium. Moreover, this work reveals the limitations of isoscaling when the two systems differ slightly in total mass and temperature. Also, a discrepancy has been observed for the ⁶He isotope, which could be explained by finite size effects or by the specific halo nature of this cluster.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"32 4 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Effects of the quark flavour thresholds in the hadronic vacuum polarization contributions to the muon anomalous magnetic moment","authors":"A V Nesterenko","doi":"10.1088/1361-6471/ad0b33","DOIUrl":"https://doi.org/10.1088/1361-6471/ad0b33","url":null,"abstract":"The equivalent representations for the hadronic vacuum polarization contributions to the muon anomalous magnetic moment <inline-formula>\u0000<tex-math>\u0000<?CDATA ${a}_{mu }^{mathrm{HVP}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msubsup><mml:mrow><mml:mi>a</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>HVP</mml:mi></mml:mrow></mml:msubsup></mml:math>\u0000<inline-graphic xlink:href=\"jpgad0b33ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> in the presence of the quark flavour thresholds are studied. Specifically, the explicit relations between the contributions given by the integration over a finite kinematic interval to <inline-formula>\u0000<tex-math>\u0000<?CDATA ${a}_{mu }^{mathrm{HVP}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msubsup><mml:mrow><mml:mi>a</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>HVP</mml:mi></mml:mrow></mml:msubsup></mml:math>\u0000<inline-graphic xlink:href=\"jpgad0b33ieqn2.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> expressed in terms of the hadronic vacuum polarization function, Adler function, and the <italic toggle=\"yes\">R</italic>-ratio of electron–positron annihilation into hadrons are derived. It is shown that the quark flavour thresholds of the hadronic vacuum polarization function generate additional contributions to <inline-formula>\u0000<tex-math>\u0000<?CDATA ${a}_{mu }^{mathrm{HVP}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msubsup><mml:mrow><mml:mi>a</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>HVP</mml:mi></mml:mrow></mml:msubsup></mml:math>\u0000<inline-graphic xlink:href=\"jpgad0b33ieqn3.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> expressed in terms of the Adler function and the <italic toggle=\"yes\">R</italic>-ratio and the explicit expressions for such contributions are obtained. The commonly employed dispersion relations, which bind together hadronic vacuum polarization function, Adler function, and <italic toggle=\"yes\">R</italic>-ratio, are extended to account for the effects due to the quark flavour thresholds. The examined additional contributions due to the heavy quark thresholds to <inline-formula>\u0000<tex-math>\u0000<?CDATA ${a}_{mu }^{mathrm{HVP}}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msubsup><mml:mrow><mml:mi>a</mml:mi></mml:mrow><mml:mrow><mml:mi>μ</mml:mi></mml:mrow><mml:mrow><mml:mi>HVP</mml:mi></mml:mrow></mml:msubsup></mml:math>\u0000<inline-graphic xlink:href=\"jpgad0b33ieqn4.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> expressed in terms of the <italic toggle=\"yes\">R</italic>-ratio appear to be quite sizable, that can be of a particular relevance for the data-driven method of assessment of the hadronic part of the muon anomalous magnetic moment.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"12 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138689403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Solution of lepton g-2 anomalies with nonlocal QED","authors":"Hang Li, P. Wang","doi":"10.1088/1361-6471/acf4ad","DOIUrl":"https://doi.org/10.1088/1361-6471/acf4ad","url":null,"abstract":"\u0000 The explanation for lepton $g-2$ anomalies is provided with the nonlocal QED which is the simple extension of the standard model. This solution is based on the same gauge symmetry as QED without introducing any new particles and interactions. The correlation functions in the nonlocal strength tension and lepton-photon interaction make it possible to explain the discrepancies of both $Delta a_mu$ and $Delta a_e$. With the same approach, the discrepancy of anomalous magnetic moment of $tau$ lepton from standard model is estimated in the range $1.19times10^{-5}$ to $3.21times10^{-3}$ which is covered by the current experimental uncertainty.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45643930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"The charge and mass symmetry breaking in the $KKbar{K}$ system","authors":"I. Filikhin, R. Kezerashvili, B. Vlahovic","doi":"10.1088/1361-6471/ad133c","DOIUrl":"https://doi.org/10.1088/1361-6471/ad133c","url":null,"abstract":"In the framework of the Faddeev equations in configuration space, we investigate the $K$(1460) meson as a resonant state of the $KKbar{K}$ kaonic system. We perform calculations for the particle configurations $% K^{0}K^{+}K^{-}$ and $K^{0}K^{+}overline{{K}^{0}}$ within two models: the $% ABC $ model, in which all three particles are distinguishable, and the $AAC$ model when two particles are identical. The models differ in their treatment of the kaon mass difference and the attractive Coulomb force between the $% K^{+}K^{-}$ pair. We found that the Coulomb shift adds over 1 MeV to the three-body binding energy. The expected correction to the binding energy due to mass redistribution from $AA$ to $AB$ is found to be negligible, up to a maximum of 6% of the relative mass correction. At the same time, the symmetry of the wave function is distorted depending on the mass ratio value. We found that the repulsive $KK$ interaction plays essential role in the binding energy of the $KKbar K$ system and report the mass of 1461.8 or 1464.1 MeV for the neutral $K^{0}$(1460) and 1466.5 or 1468.8 MeV for the charged $K^{+}$(1460) resonances, respectively, depending on the parameter sets for $KK$ and $Kbar{K}$ interactions.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"18 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139351610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Radiative B to tensor meson decays at NLO in SCET","authors":"Arslan Sikandar, M. Aslam","doi":"10.1088/1361-6471/aceb7c","DOIUrl":"https://doi.org/10.1088/1361-6471/aceb7c","url":null,"abstract":"\u0000 The radiative $B$ to tensor $left(K_2^*(1430),; f_2(1270),; a_2(1320)right)$ meson decays are studied at next-to-leading order (NLO) in soft-collinear effective theory (SCET). The SCET allows the systematic treatment of factorizable and non-factorizable contributions along with the resummation of large perturbative logarithms. We performed a two step matching and determined the soft-overlap function $zeta^perp_{T}$ and branching ratios for these $B$ to tensor meson decays. In the case of $Bto K_2^*(1430)gamma$, the numerical value of the branching ratio lies close to its experimental measurements. The estimated values of the branching ratios of CKM suppressed decays $B to left(a_2(1320),; f_2(1270)right)gamma$ are significant small compared to that of $Bto K_2^*(1430)gamma$, but still could be measured in some ongoing and future $B$ physics experiments.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45499375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Reply to comment on ‘Alpha decay of thermally excited nuclei’","authors":"J. Pérez Velásquez, N. Kelkar, O. L. Caballero","doi":"10.1088/1361-6471/ace63b","DOIUrl":"https://doi.org/10.1088/1361-6471/ace63b","url":null,"abstract":"A recent Comment by P Mohr has discussed our results for 212Po within the statistical approach, presented in our paper. Following the comment, we have recalculated the 212Po half-lives at elevated temperatures and confirm that there is indeed a decrease in the half-lives with increasing ambient temperatures, however, it is not as large as we reported for this approach. The overestimate was due to a numerical error in one of the calculations. In this reply we provide further discussions, and a new table has been provided here and in a corrigendum.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44623467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Comment on ‘Alpha decay of thermally excited nuclei’","authors":"P. Mohr","doi":"10.1088/1361-6471/ace63a","DOIUrl":"https://doi.org/10.1088/1361-6471/ace63a","url":null,"abstract":"\u0000 In a recent study, Perez Velasquez, Caballero, and Kelkar report a dramatically enhanced α decay rate of the nucleus 212Po at high temperatures which reaches almost five orders of magnitude at a temperature of 2 Giga-Kelvin. Contrary to that finding, only a moderate enhancement by a factor of three is found in the present comment which is based on a careful study of the properties of excited states in 212Po.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46791700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Influence of single-particle energy on inclusive electron scattering","authors":"Hongkai Wang, Q. Su, Chang Xu, Zhongzhou Ren, Jian Liu","doi":"10.1088/1361-6471/ace6c3","DOIUrl":"https://doi.org/10.1088/1361-6471/ace6c3","url":null,"abstract":"\u0000 Extensive stuides have been carried out over the past decades to explore the impacts of nucleon momentum distributions (NMDs) on the inclusive electron scattering (e, e′) process. Nevertheless, there remains limited research about the effects of the single-particle energy level distributions Es.p.(β) on (e, e′) reaction. For a given nucleus, the Es.p.(β) of different deformations exhibits distinct changes. In this paper, we investigate the influences of the Es.p.(β) of distinct deformations on (e, e′) process. Using the plane-wave impulse approximation method, we calculate the (e, e′) cross sections of different deformed configurations. The corresponding Es.p.(β) and NMDs are obtained from the deformed relativistic mean-field model. It is found that the theoretical (e, e′) cross sections show moderate dependence on the Es.p.(β) of distinct deformations. This is due to the conservation of energy, which restricts the number of nucleons participating in the (e, e′) process of diverse deformed configurations. The studies in this paper can provide useful guides for future lepton-nucleus scattering experiments.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48833496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}