Pub Date : 2024-06-11DOI: 10.1088/1361-6471/ad4efd
B M Loizos, X G Wang, A W Thomas, M J White and A G Williams
We revisit the standard model fit to electroweak precision observables (EWPO) using the latest data and the particle data group value of the mass of the W boson. This analysis is repeated for the value reported by CDF. The constraints on the parameter space for dark photons arising from these EWPO are then evaluated for both values of the W boson mass. We also extend previous work by placing the first electroweak precision observable constraints on the coupling of dark photons to the fermionic dark matter sector.
我们利用最新数据和粒子数据组的 W 玻色子质量值，重新审视了标准模型与电弱精密观测指标（EWPO）的拟合。对于 CDF 报告的值，我们重复了这一分析。然后针对 W 玻色子质量的两个值，评估这些 EWPO 对暗光子参数空间的约束。我们还扩展了先前的工作，对暗光子与费米暗物质部门的耦合首次施加了电弱精确可观测约束。
{"title":"Constraints on the dark sector from electroweak precision observables","authors":"B M Loizos, X G Wang, A W Thomas, M J White and A G Williams","doi":"10.1088/1361-6471/ad4efd","DOIUrl":"https://doi.org/10.1088/1361-6471/ad4efd","url":null,"abstract":"We revisit the standard model fit to electroweak precision observables (EWPO) using the latest data and the particle data group value of the mass of the W boson. This analysis is repeated for the value reported by CDF. The constraints on the parameter space for dark photons arising from these EWPO are then evaluated for both values of the W boson mass. We also extend previous work by placing the first electroweak precision observable constraints on the coupling of dark photons to the fermionic dark matter sector.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"98 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509388","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}
The cross-section measurement of 144Sm(p, γ)145Eu (T1/2 = 5.93(4) days) reaction has been performed at proton energies around 2.6–6.8 MeV using the activation technique. Molecular deposition technique was used to prepare the 144Sm targets having thickness between 100 and 350 μg cm−2 on Al backing. The astrophysical S-factor of this reaction has been measured for the first time at Epcm= 2.57 ± 0.13 MeV, S-factor = 2.542 ± 1.152(×1010) MeV-b. Cross-section data were compared with the previously measured experimental data (2.8–7.5 MeV) from literature and the theoretical predictions obtained using Hauser-Feshbach statistical model. Obtained results were utilised to predict the reaction rates for 144Sm (p, γ) and 145Eu (γ, p) reactions.
{"title":"Measurement of 144Sm(p,γ) cross-section at Gamow energies","authors":"Tanmoy Bar, Dipali Basak, Lalit Kumar Sahoo, Sukhendu Saha, Jagannath Datta, Sandipan Dasgupta, Chinmay Basu","doi":"10.1088/1361-6471/ad4d06","DOIUrl":"https://doi.org/10.1088/1361-6471/ad4d06","url":null,"abstract":"The cross-section measurement of <sup>144</sup>Sm(p, <italic toggle=\"yes\">γ</italic>)<sup>145</sup>Eu (T<sub>1/2</sub> = 5.93(4) days) reaction has been performed at proton energies around 2.6–6.8 MeV using the activation technique. Molecular deposition technique was used to prepare the <sup>144</sup>Sm targets having thickness between 100 and 350 <italic toggle=\"yes\">μ</italic>g cm<sup>−2</sup> on Al backing. The astrophysical <italic toggle=\"yes\">S</italic>-factor of this reaction has been measured for the first time at <inline-formula>\u0000<tex-math>\u0000<?CDATA ${{rm{E}}}_{p}^{mathrm{cm}}=$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:msubsup><mml:mi mathvariant=\"normal\">E</mml:mi><mml:mi>p</mml:mi><mml:mi>cm</mml:mi></mml:msubsup><mml:mo>=</mml:mo></mml:math>\u0000<inline-graphic xlink:href=\"jpgad4d06ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> 2.57 ± 0.13 MeV, <italic toggle=\"yes\">S</italic>-factor = 2.542 ± 1.152(×10<sup>10</sup>) MeV-b. Cross-section data were compared with the previously measured experimental data (2.8–7.5 MeV) from literature and the theoretical predictions obtained using Hauser-Feshbach statistical model. Obtained results were utilised to predict the reaction rates for <sup>144</sup>Sm (<italic toggle=\"yes\">p</italic>, <italic toggle=\"yes\">γ</italic>) and <sup>145</sup>Eu (<italic toggle=\"yes\">γ</italic>, <italic toggle=\"yes\">p</italic>) reactions.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"12 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141509397","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}
Pub Date : 2024-06-10DOI: 10.1088/1361-6471/ad4d07
Sakshi Shukla, Praveen C Srivastava, Deepak Patel
In this work, we have performed systematic shell-model (SM) calculations for Bi isotopes with A = 204–213 using KHH7B and KHM3Y effective interactions. We have reported yrast and non-yrast SM states corresponding to the available experimental data. From the comparison with the experimental data, we could assign spin and parity of several unconfirmed states. We have also calculated electromagnetic properties and compared them with the available experimental data and predicted where experimental data are not available. This study also includes a detailed discussion of multiple isomeric states based on computed SM configurations and their respective half-lives.
在这项工作中，我们利用 KHH7B 和 KHM3Y 有效相互作用，对 A = 204-213 的 Bi 同位素进行了系统的壳模型（SM）计算。我们报告了与现有实验数据相对应的慢速和非慢速 SM 状态。通过与实验数据的比较，我们可以确定几个未经证实的态的自旋和奇偶性。我们还计算了电磁特性，并将其与现有的实验数据进行了比较，同时在没有实验数据的地方进行了预测。本研究还根据计算的 SM 构型及其各自的半衰期详细讨论了多种异构态。
{"title":"Systematic shell-model study of structure and isomeric states in 204–213Bi isotopes","authors":"Sakshi Shukla, Praveen C Srivastava, Deepak Patel","doi":"10.1088/1361-6471/ad4d07","DOIUrl":"https://doi.org/10.1088/1361-6471/ad4d07","url":null,"abstract":"In this work, we have performed systematic shell-model (SM) calculations for Bi isotopes with <italic toggle=\"yes\">A</italic> = 204–213 using KHH7B and KHM3Y effective interactions. We have reported yrast and non-yrast SM states corresponding to the available experimental data. From the comparison with the experimental data, we could assign spin and parity of several unconfirmed states. We have also calculated electromagnetic properties and compared them with the available experimental data and predicted where experimental data are not available. This study also includes a detailed discussion of multiple isomeric states based on computed SM configurations and their respective half-lives.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"43 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141529817","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}
Pub Date : 2024-06-06DOI: 10.1088/1361-6471/ad3f34
H Abouabid, A Arhrib, R Benbrik, M Boukidi, J El Falaki
The CDF collaboration has released a new measurement of the W boson mass using their complete data set with 8.8 fb−1 in pp¯ collisions. This result deviates from the Standard Model prediction by around 7σ. We explain how the two Higgs doublet model (2HDM) with vector-like quarks (VLQs) is affected by the recently discovered W boson mass. In our study, we include both theoretical constraints such as perturbative unitarity and vacuum stability as well as a number of experimental constraints. We also look into how the effective mixing angle, measured by the SLD collaboration in addition to the CDF W-boson mass, is used to determine the S and T parameters. In the alignment limit, we investigate the case where the lighter CP-even neutral Higgs boson of the 2HDM is the one found at the LHC and demonstrate how the parameter space of the 2HDM type II in the presence of VLQs is constrained. It is found that in most cases, there is a cancellation between the 2HDM and VLQs contributions, which enlarges the parameter space of both models.
CDF 合作组织利用他们在 pp¯ 对撞中获得的 8.8 fb-1 的完整数据集，发布了对 W 玻色子质量的新测量结果。这一结果与标准模型的预言偏差约为 7σ。我们解释了具有类矢量夸克（VLQs）的双希格斯双t模型（2HDM）如何受到最近发现的W玻色子质量的影响。在我们的研究中，既包括理论约束，如微扰单位性和真空稳定性，也包括一些实验约束。除了 CDF W 玻色子质量之外，我们还研究了 SLD 协作测量的有效混合角是如何用于确定 S 和 T 参数的。在对齐极限中，我们研究了 2HDM 中较轻的 CP 偶中性希格斯玻色子是在大型强子对撞机上发现的希格斯玻色子的情况，并演示了如何约束存在 VLQ 的 2HDM II 型的参数空间。研究发现，在大多数情况下，2HDM 和 VLQs 的贡献是相互抵消的，这就扩大了两个模型的参数空间。
{"title":"The oblique parameters in the 2HDM with vector-like quarks: confronting M W CDF-II anomaly","authors":"H Abouabid, A Arhrib, R Benbrik, M Boukidi, J El Falaki","doi":"10.1088/1361-6471/ad3f34","DOIUrl":"https://doi.org/10.1088/1361-6471/ad3f34","url":null,"abstract":"The CDF collaboration has released a new measurement of the <italic toggle=\"yes\">W</italic> boson mass using their complete data set with 8.8 fb<sup>−1</sup> in <inline-formula>\u0000<tex-math>\u0000<?CDATA $pbar{p}$?>\u0000</tex-math>\u0000<mml:math overflow=\"scroll\"><mml:mi>p</mml:mi><mml:mover accent=\"true\"><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mo>¯</mml:mo></mml:mrow></mml:mover></mml:math>\u0000<inline-graphic xlink:href=\"jpgad3f34ieqn1.gif\" xlink:type=\"simple\"></inline-graphic>\u0000</inline-formula> collisions. This result deviates from the Standard Model prediction by around 7<italic toggle=\"yes\">σ</italic>. We explain how the two Higgs doublet model (2HDM) with vector-like quarks (VLQs) is affected by the recently discovered <italic toggle=\"yes\">W</italic> boson mass. In our study, we include both theoretical constraints such as perturbative unitarity and vacuum stability as well as a number of experimental constraints. We also look into how the effective mixing angle, measured by the SLD collaboration in addition to the CDF <italic toggle=\"yes\">W</italic>-boson mass, is used to determine the <italic toggle=\"yes\">S</italic> and <italic toggle=\"yes\">T</italic> parameters. In the alignment limit, we investigate the case where the lighter CP-even neutral Higgs boson of the 2HDM is the one found at the LHC and demonstrate how the parameter space of the 2HDM type II in the presence of VLQs is constrained. It is found that in most cases, there is a cancellation between the 2HDM and VLQs contributions, which enlarges the parameter space of both models.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"3 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516936","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}
Pub Date : 2024-06-06DOI: 10.1088/1361-6471/ad4d08
Maxim Dvornikov
We study the formation of a superfluid condensate of neutrinos inside a neutrino cluster. The attractive interaction between neutrinos is mediated by a scalar boson which is lighter than a neutrino. We consider the appearance of neutrino bound states consisting of particles with oppositely directed spins. The gap equation for such a system is derived. Based on numerical simulations of the neutrino distribution in a cluster, we find the phase transition temperature and the coherence length inside such a cluster for various parameters of the system. The constraints on the parameters of the Yukawa interaction, resulting in the neutrino superfluidity, are derived. We obtain that the cosmic neutrino background can contribute to the superfluid condensate inside a neutrino cluster having realistic characteristics. The mechanism of the neutrino cluster cooling in the early universe, based on the plasmons Čerenkov radiation, is proposed.
{"title":"Superfluidity in neutrino clusters","authors":"Maxim Dvornikov","doi":"10.1088/1361-6471/ad4d08","DOIUrl":"https://doi.org/10.1088/1361-6471/ad4d08","url":null,"abstract":"We study the formation of a superfluid condensate of neutrinos inside a neutrino cluster. The attractive interaction between neutrinos is mediated by a scalar boson which is lighter than a neutrino. We consider the appearance of neutrino bound states consisting of particles with oppositely directed spins. The gap equation for such a system is derived. Based on numerical simulations of the neutrino distribution in a cluster, we find the phase transition temperature and the coherence length inside such a cluster for various parameters of the system. The constraints on the parameters of the Yukawa interaction, resulting in the neutrino superfluidity, are derived. We obtain that the cosmic neutrino background can contribute to the superfluid condensate inside a neutrino cluster having realistic characteristics. The mechanism of the neutrino cluster cooling in the early universe, based on the plasmons Čerenkov radiation, is proposed.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"107 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516937","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}
Pub Date : 2024-05-26DOI: 10.1088/1361-6471/ad4379
Karim Ghorbani
We consider a dark matter (DM) model with a singlet scalar, χ, as our DM candidate, which is secluded from the standard model (SM) and annihilates to the singlet scalar, ϕ, via a contact interaction. The singlet scalar, ϕ, has a leptophilic interaction with the SM leptons and may decay leptonically at tree level, and decays into a pair of photons at loop level. The focus of this work is to consider DM masses below 10 GeV. A viable secluded region is found in the parameter space after imposing the observed relic density. There is a one-loop interaction between scalar DM and the atomic electron in this model. We then apply the available direct detection bounds from Xenon10, Xenon1T and DarkSide on the DM-electron elastic scattering cross section. While the model can explain the muon anomalous magnetic moment, we apply bounds from current and future lepton collider experiments.
{"title":"Secluded scalar dark matter and the muon anomalous magnetic moment","authors":"Karim Ghorbani","doi":"10.1088/1361-6471/ad4379","DOIUrl":"https://doi.org/10.1088/1361-6471/ad4379","url":null,"abstract":"We consider a dark matter (DM) model with a singlet scalar, χ, as our DM candidate, which is secluded from the standard model (SM) and annihilates to the singlet scalar, ϕ, via a contact interaction. The singlet scalar, ϕ, has a leptophilic interaction with the SM leptons and may decay leptonically at tree level, and decays into a pair of photons at loop level. The focus of this work is to consider DM masses below 10 GeV. A viable secluded region is found in the parameter space after imposing the observed relic density. There is a one-loop interaction between scalar DM and the atomic electron in this model. We then apply the available direct detection bounds from Xenon10, Xenon1T and DarkSide on the DM-electron elastic scattering cross section. While the model can explain the muon anomalous magnetic moment, we apply bounds from current and future lepton collider experiments.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"24 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141172164","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}
Pub Date : 2024-05-13DOI: 10.1088/1361-6471/ad3e96
Dipali Basak, Tanmoy Bar, Lalit Kumar Sahoo, Sukhendu Saha, T K Rana, C Bhattacharya, S Manna, Samir Kundu, J K Sahoo, J K Meena, A K Saha, Ashok Kumar Mondal and Chinmay Basu
The α-optical potential is one of the key input parameters used to measure the reaction rate of the (γ, α)-process using the Hauser-Feshbach statistical model and the principle of detailed balance. α-elastic scattering experiment on 113In p-nucleus was carried out in the energy range Elab = 26−32 MeV. The vacuum evaporation technique was used to prepare the 113In target (∼86 μg cm−2). An energy-dependent local optical potential parameters set was obtained by analysing the experimental elastic scattering angular distribution data. The local potential parameters are extrapolated for lower energies and are used to calculate the 113In(α, γ) reaction cross-section.
α光势是利用豪瑟-费斯巴赫统计模型和详细平衡原理测量（γ，α）过程反应速率的关键输入参数之一。在 Elab = 26-32 MeV 的能量范围内对 113In p 核进行了 α 弹性散射实验。实验采用真空蒸发技术制备 113In 靶件（∼86 μg cm-2）。通过分析实验弹性散射角分布数据，获得了与能量相关的局部光学势参数集。在较低能量下推导出的局部光势参数用于计算 113In(α, γ)反应截面。
{"title":"Study of 113In(α, α) elastic scattering to determine α-optical potential relevant for astrophysical γ-process","authors":"Dipali Basak, Tanmoy Bar, Lalit Kumar Sahoo, Sukhendu Saha, T K Rana, C Bhattacharya, S Manna, Samir Kundu, J K Sahoo, J K Meena, A K Saha, Ashok Kumar Mondal and Chinmay Basu","doi":"10.1088/1361-6471/ad3e96","DOIUrl":"https://doi.org/10.1088/1361-6471/ad3e96","url":null,"abstract":"The α-optical potential is one of the key input parameters used to measure the reaction rate of the (γ, α)-process using the Hauser-Feshbach statistical model and the principle of detailed balance. α-elastic scattering experiment on 113In p-nucleus was carried out in the energy range Elab = 26−32 MeV. The vacuum evaporation technique was used to prepare the 113In target (∼86 μg cm−2). An energy-dependent local optical potential parameters set was obtained by analysing the experimental elastic scattering angular distribution data. The local potential parameters are extrapolated for lower energies and are used to calculate the 113In(α, γ) reaction cross-section.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"129 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141058778","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}
Pub Date : 2024-05-12DOI: 10.1088/1361-6471/ad3f35
S Spor
In a model-independent way, we explore the potential of photon-induced interactions with the process γ*γ* → ZZ to investigate CP-conserving and CP-violating dimension-six operators of Higgs-gauge boson couplings using the standard model effective field theory. The existence of anomalous Hγγ and HZZ couplings is discussed at 3 TeV compact linear collider (CLIC) and 10 TeV muon collider (MuC) with integrated luminosities of 5 and 10 ab−1, respectively. All signal and relevant background events are generated in MadGraph and passed through PYTHIA for parton showering and hadronization. The detector effects are evaluated using CLIC and MuC detector cards tuned in Delphes. We report the 95% confidence level limits on the Wilson coefficients , , , , , and and compare them with the experimental and phenomenological limits.
{"title":"Study on the sensitivity of the Higgs boson couplings in photon–photon collision at CLIC and muon collider","authors":"S Spor","doi":"10.1088/1361-6471/ad3f35","DOIUrl":"https://doi.org/10.1088/1361-6471/ad3f35","url":null,"abstract":"In a model-independent way, we explore the potential of photon-induced interactions with the process γ*γ* → ZZ to investigate CP-conserving and CP-violating dimension-six operators of Higgs-gauge boson couplings using the standard model effective field theory. The existence of anomalous Hγγ and HZZ couplings is discussed at 3 TeV compact linear collider (CLIC) and 10 TeV muon collider (MuC) with integrated luminosities of 5 and 10 ab−1, respectively. All signal and relevant background events are generated in MadGraph and passed through PYTHIA for parton showering and hadronization. The detector effects are evaluated using CLIC and MuC detector cards tuned in Delphes. We report the 95% confidence level limits on the Wilson coefficients , , , , , and and compare them with the experimental and phenomenological limits.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"131 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140931886","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}
Pub Date : 2024-05-06DOI: 10.1088/1361-6471/ad33e2
Liam Hockley, Waseem Kamleh, Derek Leinweber and Anthony Thomas
We present a lattice QCD analysis of the Δ-baryon spectrum, with the goal of finding the position of the 2s radial excitation of the Δ(1232) ground state. Using smeared three-quark operators in a correlation matrix analysis, we report masses for the ground, first and second excited states of the JP = 3/2+ spectrum across a broad range of . We identify the lowest lying state as being a 1s state, consistent with the well known Δ(1232). The first excitation is identified as a 2s state, but is found to have a mass of approximately 2.15 GeV on our ∼3 fm lattice, which does not appear to be associated with the Δ(1600) resonance in a significant manner. We also report on the spin-1/2 and odd-parity states accessible via our methods. The large excitation energies of the radial excitations provide a potential resolution to the long-standing missing baryon resonances problem.
{"title":"Searching for the first radial excitation of the Δ(1232) in lattice QCD","authors":"Liam Hockley, Waseem Kamleh, Derek Leinweber and Anthony Thomas","doi":"10.1088/1361-6471/ad33e2","DOIUrl":"https://doi.org/10.1088/1361-6471/ad33e2","url":null,"abstract":"We present a lattice QCD analysis of the Δ-baryon spectrum, with the goal of finding the position of the 2s radial excitation of the Δ(1232) ground state. Using smeared three-quark operators in a correlation matrix analysis, we report masses for the ground, first and second excited states of the JP = 3/2+ spectrum across a broad range of . We identify the lowest lying state as being a 1s state, consistent with the well known Δ(1232). The first excitation is identified as a 2s state, but is found to have a mass of approximately 2.15 GeV on our ∼3 fm lattice, which does not appear to be associated with the Δ(1600) resonance in a significant manner. We also report on the spin-1/2 and odd-parity states accessible via our methods. The large excitation energies of the radial excitations provide a potential resolution to the long-standing missing baryon resonances problem.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"10 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140883404","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}
Pub Date : 2024-04-28DOI: 10.1088/1361-6471/ad3975
Peng-Cheng Chu, He Liu, Xiao-Hua Li, Min Ju, Xu-Hao Wu and Xiao-Min Zhang
The properties of strange quark matter (SQM) and color-flavor-locked (CFL) quark matter are investigated in quark stars (QSs) at zero temperature case within confined-isospin-density-dependent-mass (CIDDM) model. The mass–radius relation of QSs are also studied by considering newly proposed mass–radius constraints in CFL phase. Our results indicate that we can obtain more stable and stiffer equation of state (EOS) by considering CFL phase within CIDDM model at zero temperature. While the GW190814's secondary component with a mass around 2.6 M⊙ cannot be QSs within CIDDM model in SQM case, it can be well described as QSs by considering CFL phase within CIDDM model in this work. In particular, we further construct a density-dependent pairing energy gap to connect the EOS of SQM and CFL quark matter with constant pairing energy gap Δ, and the results indicate that by extending the paring energy gap to include density dependence, the mass–radius lines within CIDDM model can satisfy most of the mass–radius region constraints in recent pulsar observations.
{"title":"Quark star matter in the color-flavor-locked state with a density-dependent quark mass model","authors":"Peng-Cheng Chu, He Liu, Xiao-Hua Li, Min Ju, Xu-Hao Wu and Xiao-Min Zhang","doi":"10.1088/1361-6471/ad3975","DOIUrl":"https://doi.org/10.1088/1361-6471/ad3975","url":null,"abstract":"The properties of strange quark matter (SQM) and color-flavor-locked (CFL) quark matter are investigated in quark stars (QSs) at zero temperature case within confined-isospin-density-dependent-mass (CIDDM) model. The mass–radius relation of QSs are also studied by considering newly proposed mass–radius constraints in CFL phase. Our results indicate that we can obtain more stable and stiffer equation of state (EOS) by considering CFL phase within CIDDM model at zero temperature. While the GW190814's secondary component with a mass around 2.6 M⊙ cannot be QSs within CIDDM model in SQM case, it can be well described as QSs by considering CFL phase within CIDDM model in this work. In particular, we further construct a density-dependent pairing energy gap to connect the EOS of SQM and CFL quark matter with constant pairing energy gap Δ, and the results indicate that by extending the paring energy gap to include density dependence, the mass–radius lines within CIDDM model can satisfy most of the mass–radius region constraints in recent pulsar observations.","PeriodicalId":16766,"journal":{"name":"Journal of Physics G: Nuclear and Particle Physics","volume":"46 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2024-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140810328","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}
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