In this work, we have implemented $A_4$ modular symmetry in the left-right symmetric linear seesaw model. Interestingly, such modular symmetry restricts the proliferation of flavon fields, and as a result, the predictibility of the model is enhanced. The fermion sector of the model comprises of quarks, leptons and a sterile fermion in each generation, while the scalar sector consists of Higgs doublets and bidoublets. We investigate numerically various Yukawa coupling co-efficients, the neutrino masses and mixing parameters in our intended model and predictions become consistent with $3sigma$ range of current neutrino oscillation data. We also studied the non-unitarity, effects on lepton flavor violation in our model and evolution of lepton asymmetry to explain the current baryon asymmetry of the universe.
{"title":"Neutrino Model in Left-Right Symmetric Linear Seesaw Augmented with $A_4$ Modular Group","authors":"Raktima Kalita, Mahadev Patgiri","doi":"arxiv-2409.10195","DOIUrl":"https://doi.org/arxiv-2409.10195","url":null,"abstract":"In this work, we have implemented $A_4$ modular symmetry in the left-right\u0000symmetric linear seesaw model. Interestingly, such modular symmetry restricts\u0000the proliferation of flavon fields, and as a result, the predictibility of the\u0000model is enhanced. The fermion sector of the model comprises of quarks, leptons\u0000and a sterile fermion in each generation, while the scalar sector consists of\u0000Higgs doublets and bidoublets. We investigate numerically various Yukawa\u0000coupling co-efficients, the neutrino masses and mixing parameters in our\u0000intended model and predictions become consistent with $3sigma$ range of\u0000current neutrino oscillation data. We also studied the non-unitarity, effects\u0000on lepton flavor violation in our model and evolution of lepton asymmetry to\u0000explain the current baryon asymmetry of the universe.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258870","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}
Domain walls are topological defects produced by the spontaneous symmetry-breaking of discrete symmetry during cosmological phase transitions. The horizon-size domain wall can significantly contribute to the energy density in the late-evolution stage. We propose that the density perturbations from the fluctuations in the number density of the horizon-size domain wall could collapse to form primordial black holes. This mechanism becomes effective when the domain wall energy density ratio to that of the radiation reaches about 0.1 in the radiation-dominated universe. We find that models with $Z_2$ symmetry are excluded for interpreting pulsar timing array observations on the nano-Hz gravitational wave background since this model's domain wall number density fluctuations could lead to an overabundance of the primordial black holes. Moreover, models with $Nsim 10$ domain walls also suffer strong constraints from the overabundance of primordial black holes.
{"title":"Primordial black hole from domain wall fluctuations","authors":"Bo-Qiang Lu, Cheng-Wei Chiang, Tianjun Li","doi":"arxiv-2409.09986","DOIUrl":"https://doi.org/arxiv-2409.09986","url":null,"abstract":"Domain walls are topological defects produced by the spontaneous\u0000symmetry-breaking of discrete symmetry during cosmological phase transitions.\u0000The horizon-size domain wall can significantly contribute to the energy density\u0000in the late-evolution stage. We propose that the density perturbations from the\u0000fluctuations in the number density of the horizon-size domain wall could\u0000collapse to form primordial black holes. This mechanism becomes effective when\u0000the domain wall energy density ratio to that of the radiation reaches about 0.1\u0000in the radiation-dominated universe. We find that models with $Z_2$ symmetry\u0000are excluded for interpreting pulsar timing array observations on the nano-Hz\u0000gravitational wave background since this model's domain wall number density\u0000fluctuations could lead to an overabundance of the primordial black holes.\u0000Moreover, models with $Nsim 10$ domain walls also suffer strong constraints\u0000from the overabundance of primordial black holes.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258931","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}
The masses, the fine-structure splitting, and two-photon decay widths of the higher $nP$-charmonium states are calculated in the relativistic string model, reduced to the spinless Salpeter equation, where the static potential has no fitting parameters and the $c-$quark mass has the physical value. The resulting masses of $h_c(3P)$, $chi_{c1}(3P)$, $chi_{c0}(4P)$, $chi_{c0}(5P)$, $chi_{c1}(5P)$ are obtained in a good agreement with the experimental masses of the LHCb resonances: $h_c(4300)$, $chi_{c1}(4274)$, $X(4500)$, $X(4700)$, $X(4685)$. To test sensitivity of results to a chosen gluon-exchange (GE) potential, three types of $V_{ge}(r)$ are considered. In first case the non-screened GE potential with large vector coupling at asymptotic, $alpha_{rm V}(rm asym.)=0.635$, and the $c$-quark mass $m_c=1.430$ GeV are taken; in second case a screened $V_{ge}$ and $m_c=1.385$ are investigated, and in third case the GE potential is totally suppressed, $V_{ge}=0$, and $m_c=1.32$ GeV. The agreement with experiment is reached only if the same (universal) flattened confining potential, introduced in the analysis of the radial Regge trajectories of light mesons, is used. The unobserved $6P,0^+$ resonance with the mass $cong 4.81$ GeV, near $J/psiphi(1680)$ threshold, is predicted. Our analysis shows that the screening of the GE potential is possible but weakly affects the physical results obtained. The calculated two-photon decay widths weakly differ in the three cases but may become an important factor, which distinguishes $cbar c$ and four-quark states.
{"title":"The higher $χ_{cJ}(nP)$, $h_c(nP)$ states and the role of the gluon-exchange potential","authors":"A. M. Badalian","doi":"arxiv-2409.10761","DOIUrl":"https://doi.org/arxiv-2409.10761","url":null,"abstract":"The masses, the fine-structure splitting, and two-photon decay widths of the\u0000higher $nP$-charmonium states are calculated in the relativistic string model,\u0000reduced to the spinless Salpeter equation, where the static potential has no\u0000fitting parameters and the $c-$quark mass has the physical value. The resulting\u0000masses of $h_c(3P)$, $chi_{c1}(3P)$, $chi_{c0}(4P)$, $chi_{c0}(5P)$,\u0000$chi_{c1}(5P)$ are obtained in a good agreement with the experimental masses\u0000of the LHCb resonances: $h_c(4300)$, $chi_{c1}(4274)$, $X(4500)$, $X(4700)$,\u0000$X(4685)$. To test sensitivity of results to a chosen gluon-exchange (GE)\u0000potential, three types of $V_{ge}(r)$ are considered. In first case the\u0000non-screened GE potential with large vector coupling at asymptotic,\u0000$alpha_{rm V}(rm asym.)=0.635$, and the $c$-quark mass $m_c=1.430$ GeV are\u0000taken; in second case a screened $V_{ge}$ and $m_c=1.385$ are investigated, and\u0000in third case the GE potential is totally suppressed, $V_{ge}=0$, and\u0000$m_c=1.32$ GeV. The agreement with experiment is reached only if the same\u0000(universal) flattened confining potential, introduced in the analysis of the\u0000radial Regge trajectories of light mesons, is used. The unobserved $6P,0^+$\u0000resonance with the mass $cong 4.81$ GeV, near $J/psiphi(1680)$ threshold, is\u0000predicted. Our analysis shows that the screening of the GE potential is\u0000possible but weakly affects the physical results obtained. The calculated\u0000two-photon decay widths weakly differ in the three cases but may become an\u0000important factor, which distinguishes $cbar c$ and four-quark states.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258811","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}
We present a new, simple approach to the study of semileptonic $B to D^* ell nu_ell$ decays based on the angular distributions of the final state particles only. Our approach is model independent and never requires the knowledge of $vert V_{cb}vert$. By studying such distributions in the case of light leptons, a comparison between results from different data sets from the Belle and BelleII Collaborations and between data and Standard Model calculations is also given for several interesting quantities. A good consistency is observed between some of the experimental results and the theoretical predictions.
我们提出了一种研究半轻子$B to D^*ell nu_ell$ 衰变的新的、简单的方法，它只基于终态粒子的角分布。我们的方法与模型无关，而且从来不需要知道$vert V_{cb}vert$。通过研究飞行轻子的这种分布，还给出了贝勒和贝勒II合作组不同数据集的结果之间的比较，以及数据和标准模型计算之间的比较，并给出了几个有趣的量。在一些实验结果和理论预测之间观察到了良好的一致性。
{"title":"What we can learn from the angular differential rates (only) in semileptonic $B to D^* ell ν_ell$ decays","authors":"G. Martinelli, S. Simula, L. Vittorio","doi":"arxiv-2409.10492","DOIUrl":"https://doi.org/arxiv-2409.10492","url":null,"abstract":"We present a new, simple approach to the study of semileptonic $B to D^*\u0000ell nu_ell$ decays based on the angular distributions of the final state\u0000particles only. Our approach is model independent and never requires the\u0000knowledge of $vert V_{cb}vert$. By studying such distributions in the case of\u0000light leptons, a comparison between results from different data sets from the\u0000Belle and BelleII Collaborations and between data and Standard Model\u0000calculations is also given for several interesting quantities. A good\u0000consistency is observed between some of the experimental results and the\u0000theoretical predictions.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"203 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258865","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}
Kimihiro Nomura, Jiro Soda, Kazushige Ueda, Ziwei Wang
We study conversion processes between gravitons and dark photons and reveal the effects of dark photons on the polarization of gravitational waves. Considering cosmological dark magnetic fields, we investigate the evolution of the intensity and polarization of gravitational waves through the conversion. Specifically, we demonstrate that for minimal coupling between gravitons and dark photons, the intensity, circular polarization, and linear polarization evolve separately. We derive explicit formulas for the statistical mean and variance of the intensity and polarization when the gravitational waves pass through magnetic fields with random orientation. The formulas capture how the initial polarization of dark photons will be imprinted on the observed gravitational wave background.
{"title":"Imprints of Dark Photons on Gravitational Wave Polarizations","authors":"Kimihiro Nomura, Jiro Soda, Kazushige Ueda, Ziwei Wang","doi":"arxiv-2409.10471","DOIUrl":"https://doi.org/arxiv-2409.10471","url":null,"abstract":"We study conversion processes between gravitons and dark photons and reveal\u0000the effects of dark photons on the polarization of gravitational waves.\u0000Considering cosmological dark magnetic fields, we investigate the evolution of\u0000the intensity and polarization of gravitational waves through the conversion.\u0000Specifically, we demonstrate that for minimal coupling between gravitons and\u0000dark photons, the intensity, circular polarization, and linear polarization\u0000evolve separately. We derive explicit formulas for the statistical mean and\u0000variance of the intensity and polarization when the gravitational waves pass\u0000through magnetic fields with random orientation. The formulas capture how the\u0000initial polarization of dark photons will be imprinted on the observed\u0000gravitational wave background.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258929","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}
A very pressing question in contemporary physics is the identity of Dark Matter (DM), and one that has not been answered affirmatively to any degree so far. Primordial Black Holes (PBHs) are one of the most well-motivated DM candidates. Light enough PBHs have been constrained by either the non-detection of their Hawking radiation itself, or by the non-observation of any measurable effects of this radiation on astrophysical and cosmological observables. We constrain the PBH density by their Hawking radiation effect on the intergalactic medium (IGM) temperature evolution. We use the latest deductions of IGM temperature from Lyman-$alpha$ forest observations. We put constraints on the fraction of PBH DM with masses $5 times 10^{15}$ g - $10^{17}$ g separately for spinning and non-spinning BHs. We derive constraints by dealing with the heating effects of the astrophysical reionization of the IGM in two ways. In one way, we completely neglect this heating due to astrophysical sources, thus giving us weaker constraints, but completely robust to the reionization history of the universe. In the second way, we utilise some modelling of the ionization and temperature history, and use it to derive more stringent constraints. We find that for non-spinning PBHs of mass $10^{16}$ g, the current measurements can constrain the PBH-density to be $lesssim$ 0.1% of the total DM. We find that these constraints from the latest Lyman-$alpha$ forest temperature measurements are competitive, and hence provide a new observable to probe the nature of PBH DM. The systematics affecting Lyman-$alpha$ forest measurements are different from other constraining observations, and thus this is a complementary probe.
当代物理学中一个非常紧迫的问题是暗物质（DarkMatter，DM）的身份，而这个问题迄今为止还没有得到任何肯定的答案。原始黑洞（PBHs）是动机最充分的暗物质候选者之一。由于没有探测到霍金辐射本身，或者没有观测到这种辐射对天体物理和宇宙学观测指标的任何可测量的影响，足够轻的原始黑洞一直受到限制。我们通过霍金辐射对银河系间介质（IGM）温度演化的影响来约束 PBH 密度。我们使用了从莱曼-$alpha$森林观测中对IGM温度的最新推导。我们分别对自旋和非自旋BH的质量为5乘以10^{15}$ g - 10^{17}$ g的PBH DM的比例进行了约束。我们通过两种方式来处理IGM的天体物理再电离的加热效应，从而得出约束条件。一种方法是，我们完全忽略天体物理源引起的加热效应，从而得到较弱的约束条件，但对宇宙的电离历史具有完全的稳健性。第二种方法是，我们利用电离和温度历史的一些模型，并利用它得出更严格的约束条件。我们发现，对于质量为10^{16}$ g的非自旋PBH，目前的测量结果可以将PBH密度约束为DM总量的0.1%。我们发现，这些来自最新莱曼-$α-森林温度测量的约束是有竞争力的，从而为探测PBH DM的性质提供了一个新的观测指标。影响莱曼-阿尔法森林测量的系统性与其他约束观测结果不同，因此这是一个补充性的探测结果。
{"title":"Hunting Primordial Black Hole Dark Matter in Lyman-$α$ Forest","authors":"Akash Kumar Saha, Abhijeet Singh, Priyank Parashari, Ranjan Laha","doi":"arxiv-2409.10617","DOIUrl":"https://doi.org/arxiv-2409.10617","url":null,"abstract":"A very pressing question in contemporary physics is the identity of Dark\u0000Matter (DM), and one that has not been answered affirmatively to any degree so\u0000far. Primordial Black Holes (PBHs) are one of the most well-motivated DM\u0000candidates. Light enough PBHs have been constrained by either the non-detection\u0000of their Hawking radiation itself, or by the non-observation of any measurable\u0000effects of this radiation on astrophysical and cosmological observables. We\u0000constrain the PBH density by their Hawking radiation effect on the\u0000intergalactic medium (IGM) temperature evolution. We use the latest deductions\u0000of IGM temperature from Lyman-$alpha$ forest observations. We put constraints\u0000on the fraction of PBH DM with masses $5 times 10^{15}$ g - $10^{17}$ g\u0000separately for spinning and non-spinning BHs. We derive constraints by dealing\u0000with the heating effects of the astrophysical reionization of the IGM in two\u0000ways. In one way, we completely neglect this heating due to astrophysical\u0000sources, thus giving us weaker constraints, but completely robust to the\u0000reionization history of the universe. In the second way, we utilise some\u0000modelling of the ionization and temperature history, and use it to derive more\u0000stringent constraints. We find that for non-spinning PBHs of mass $10^{16}$ g,\u0000the current measurements can constrain the PBH-density to be $lesssim$ 0.1% of\u0000the total DM. We find that these constraints from the latest Lyman-$alpha$\u0000forest temperature measurements are competitive, and hence provide a new\u0000observable to probe the nature of PBH DM. The systematics affecting\u0000Lyman-$alpha$ forest measurements are different from other constraining\u0000observations, and thus this is a complementary probe.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258806","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}
Super-Kamiokande's spallation backgrounds - the delayed beta decays of nuclides following cosmic-ray muons - are nearly all produced by the small fraction of muons with hadronic showers. We show that these hadronic showers also produce neutrons; their captures can be detected with high efficiency due to the recent addition of dissolved gadolinium to Super-Kamiokande. We show that new cuts based on the neutron tagging of showers could reduce spallation backgrounds by a factor of at least four beyond present cuts. With further work, this could lead to a near-elimination of detector backgrounds above about 6 MeV, which would significantly improve the sensitivity of Super-Kamiokande. These findings heighten the importance of adding gadolinium to Hyper-Kamiokande, which is at a shallower depth. Further, a similar approach could be used in other detectors, for example, the JUNO liquid-scintillator detector, which is also at a shallower depth.
{"title":"Neutron Tagging Can Greatly Reduce Spallation Backgrounds in Super-Kamiokande","authors":"Obada Nairat, John F. Beacom, Shirley Weishi Li","doi":"arxiv-2409.10611","DOIUrl":"https://doi.org/arxiv-2409.10611","url":null,"abstract":"Super-Kamiokande's spallation backgrounds - the delayed beta decays of\u0000nuclides following cosmic-ray muons - are nearly all produced by the small\u0000fraction of muons with hadronic showers. We show that these hadronic showers\u0000also produce neutrons; their captures can be detected with high efficiency due\u0000to the recent addition of dissolved gadolinium to Super-Kamiokande. We show\u0000that new cuts based on the neutron tagging of showers could reduce spallation\u0000backgrounds by a factor of at least four beyond present cuts. With further\u0000work, this could lead to a near-elimination of detector backgrounds above about\u00006 MeV, which would significantly improve the sensitivity of Super-Kamiokande.\u0000These findings heighten the importance of adding gadolinium to\u0000Hyper-Kamiokande, which is at a shallower depth. Further, a similar approach\u0000could be used in other detectors, for example, the JUNO liquid-scintillator\u0000detector, which is also at a shallower depth.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"1200 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258812","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}
Pedro Bicudo, Marina Krstic Marinkovic, Lasse Müller, Marc Wagner
We report on our ongoing lattice QCD computation of antistatic-antistatic potentials in the presence of two light quarks using the CLS $N_f=2$ gauge configurations and the OpenQ*D codebase. We utilize a set of 16 creation operators, corresponding to 8 sectors characterized by angular momentum and parity quantum numbers for light quarks $qq = (ud - du) / sqrt{2}$ (isospin $0$), $qq in { uu , (ud + du) / sqrt{2}, dd }$ (isospin $1$) and $qq in { us , ds }$ (isospin $1/2$ and strangeness $-1$). We improve on previous work by considering a large number of off-axis separations of the static antiquarks and by using tree-level improvement. The resulting potentials provide vague indication for one-pion exchange at $bar Q bar Q$ separations $r gtrapprox$ 0.5 fm.
{"title":"Antistatic-antistatic $bar Q bar Q qq$ potentials for $u$, $d$ and $s$ light quarks from lattice QCD","authors":"Pedro Bicudo, Marina Krstic Marinkovic, Lasse Müller, Marc Wagner","doi":"arxiv-2409.10786","DOIUrl":"https://doi.org/arxiv-2409.10786","url":null,"abstract":"We report on our ongoing lattice QCD computation of antistatic-antistatic\u0000potentials in the presence of two light quarks using the CLS $N_f=2$ gauge\u0000configurations and the OpenQ*D codebase. We utilize a set of 16 creation\u0000operators, corresponding to 8 sectors characterized by angular momentum and\u0000parity quantum numbers for light quarks $qq = (ud - du) / sqrt{2}$ (isospin\u0000$0$), $qq in { uu , (ud + du) / sqrt{2}, dd }$ (isospin $1$) and $qq in {\u0000us , ds }$ (isospin $1/2$ and strangeness $-1$). We improve on previous work\u0000by considering a large number of off-axis separations of the static antiquarks\u0000and by using tree-level improvement. The resulting potentials provide vague\u0000indication for one-pion exchange at $bar Q bar Q$ separations $r gtrapprox$\u00000.5 fm.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"195 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258816","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}
Gauri DeviBanaras Hindu University, Varanasi, India, B. K. SinghBanaras Hindu University, Varanasi, India, Discipline of Natural Sciences, PDPM Indian Institute of Information Technology Design & Manufacturing, Jabalpur, India
For the present work, we have used the HYDJET++ model to explore the production of pure multi-strange hadrons in Pb+Pb collisions at $sqrt{s_{NN}}$= 2.76 TeV and $sqrt{s_{NN}}$= 5.02 TeV collision energies, respectively. We have simulated the $p_{T}$-spectra and elliptic flow ($v_{2}$) of $phi$-meson and $Omega$-baryons comparing our results with ALICE experimental data and several phenomenological models (HIJING/$Boverline{B}$, VISHNU, EPOS, AMPT, and Krakow) across various centrality intervals. Additionally, we have calculated the nuclear modification factors ($R_{AA}$ and $R_{CP}$), which provide a perception of jet quenching phenomena. Hence, our findings enable the study of the energy and system dependence of $phi$ and $Omega$ hadrons production over a wide range of ultra-relativistic collision energies. We also present the particle ratios ($Omega/phi$, $overline{Omega}^{+}/Omega^{-}$, $Omega/pi$, and $phi/pi$), offering insights on the strangeness enhancement and chemical properties of the medium at both LHC collision energies.
{"title":"A study of pure multi-strange hadrons production in Pb+Pb collisions at LHC energies using HYDJET++ model","authors":"Gauri DeviBanaras Hindu University, Varanasi, India, B. K. SinghBanaras Hindu University, Varanasi, India, Discipline of Natural Sciences, PDPM Indian Institute of Information Technology Design & Manufacturing, Jabalpur, India","doi":"arxiv-2409.10435","DOIUrl":"https://doi.org/arxiv-2409.10435","url":null,"abstract":"For the present work, we have used the HYDJET++ model to explore the\u0000production of pure multi-strange hadrons in Pb+Pb collisions at\u0000$sqrt{s_{NN}}$= 2.76 TeV and $sqrt{s_{NN}}$= 5.02 TeV collision energies,\u0000respectively. We have simulated the $p_{T}$-spectra and elliptic flow ($v_{2}$)\u0000of $phi$-meson and $Omega$-baryons comparing our results with ALICE\u0000experimental data and several phenomenological models (HIJING/$Boverline{B}$,\u0000VISHNU, EPOS, AMPT, and Krakow) across various centrality intervals.\u0000Additionally, we have calculated the nuclear modification factors ($R_{AA}$ and\u0000$R_{CP}$), which provide a perception of jet quenching phenomena. Hence, our\u0000findings enable the study of the energy and system dependence of $phi$ and\u0000$Omega$ hadrons production over a wide range of ultra-relativistic collision\u0000energies. We also present the particle ratios ($Omega/phi$,\u0000$overline{Omega}^{+}/Omega^{-}$, $Omega/pi$, and $phi/pi$), offering\u0000insights on the strangeness enhancement and chemical properties of the medium\u0000at both LHC collision energies.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258874","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}
Samuel Goldstein, Fiona McCarthy, Cristina Mondino, J. Colin Hill, Junwu Huang, Matthew C. Johnson
The resonant conversion of cosmic microwave background (CMB) photons into axions within large-scale structure induces an anisotropic spectral distortion in CMB temperature maps. Applying state-of-the-art foreground cleaning techniques to $textit{Planck}$ CMB observations, we construct maps of axion-induced "patchy screening" of the CMB. We cross-correlate these maps with data from the $textit{unWISE}$ galaxy survey and find no evidence of axions. We constrain the axion-photon coupling, $g_{agammagamma} lesssim 2 times 10^{-12}~{rm GeV}^{-1}$, at the 95% confidence level for axion masses in the range $10^{-13}~{rm eV} lesssim m_a lesssim 10^{-12}~{rm eV}$. These constraints are competitive with the tightest astrophysical axion limits in this mass range and are inferred from robust population-level statistics, which makes them complementary to existing searches that rely on modeling of individual systems.
{"title":"Constraints on axions from patchy screening of the cosmic microwave background","authors":"Samuel Goldstein, Fiona McCarthy, Cristina Mondino, J. Colin Hill, Junwu Huang, Matthew C. Johnson","doi":"arxiv-2409.10514","DOIUrl":"https://doi.org/arxiv-2409.10514","url":null,"abstract":"The resonant conversion of cosmic microwave background (CMB) photons into\u0000axions within large-scale structure induces an anisotropic spectral distortion\u0000in CMB temperature maps. Applying state-of-the-art foreground cleaning\u0000techniques to $textit{Planck}$ CMB observations, we construct maps of\u0000axion-induced \"patchy screening\" of the CMB. We cross-correlate these maps with\u0000data from the $textit{unWISE}$ galaxy survey and find no evidence of axions.\u0000We constrain the axion-photon coupling, $g_{agammagamma} lesssim 2 times\u000010^{-12}~{rm GeV}^{-1}$, at the 95% confidence level for axion masses in the\u0000range $10^{-13}~{rm eV} lesssim m_a lesssim 10^{-12}~{rm eV}$. These\u0000constraints are competitive with the tightest astrophysical axion limits in\u0000this mass range and are inferred from robust population-level statistics, which\u0000makes them complementary to existing searches that rely on modeling of\u0000individual systems.","PeriodicalId":501067,"journal":{"name":"arXiv - PHYS - High Energy Physics - Phenomenology","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142258926","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}
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