We present one-loop formulas for the decay of CP-odd Higgs $A^0 rightarrow ell bar{ell } V$ with ℓ ≡ e, μ and V ≡ γ, Z in Higgs Extensions of the Standard Model, considering two higgs doublet model with an extra complex (and real) scalar, two higgs doublet model as well as triplet higgs model. Analytic results for one-loop amplitudes are expressed in terms of the basic Passarino-Veltman functions following the standard notations of LoopTools. As a result, physical results can be generated numerically by using the package. In phenomenological results, the total decay widths and the differential decay rates with respect to the invariant mass of lepton pair are analyzed for two typical models such as two higgs doublet model and triplet higgs model.
我们提出了 CP-odd 希格斯粒子 $A^0 rightarrow ell bar{ell } 的衰变一回路公式。V$ ，其中ℓ ≡ e, μ 和 V ≡ γ, Z 在标准模型的希格斯扩展模型中，考虑了带有额外复数（和实数）标量的两个希格斯双t模型、两个希格斯双t模型以及三重希格斯模型。一回路振幅的分析结果是按照 LoopTools 的标准符号用基本帕萨里诺-韦尔曼函数表示的。因此，使用该软件包可以数值生成物理结果。在现象学结果中，分析了两个典型模型（如两个希格斯双t模型和三重希格斯模型）的总衰变宽度和与轻子对不变质量有关的差分衰变率。
{"title":"One-loop contributions for A0 → ℓℓV with ℓ ≡ e, μ and V ≡ γ, Z in higgs extensions of the standard model","authors":"Khiem Hong Phan, Dzung Tri Tran, Thanh Huy Nguyen","doi":"10.1093/ptep/ptae103","DOIUrl":"https://doi.org/10.1093/ptep/ptae103","url":null,"abstract":"We present one-loop formulas for the decay of CP-odd Higgs $A^0 rightarrow ell bar{ell } V$ with ℓ ≡ e, μ and V ≡ γ, Z in Higgs Extensions of the Standard Model, considering two higgs doublet model with an extra complex (and real) scalar, two higgs doublet model as well as triplet higgs model. Analytic results for one-loop amplitudes are expressed in terms of the basic Passarino-Veltman functions following the standard notations of LoopTools. As a result, physical results can be generated numerically by using the package. In phenomenological results, the total decay widths and the differential decay rates with respect to the invariant mass of lepton pair are analyzed for two typical models such as two higgs doublet model and triplet higgs model.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141577350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Correction to: Cosmological gravity probes: Connecting recent theoretical developments to forthcoming observations","authors":"","doi":"10.1093/ptep/ptae104","DOIUrl":"https://doi.org/10.1093/ptep/ptae104","url":null,"abstract":"","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141850591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Using unitarity, unlike the approaches available in the literature, we have constructed 9 independent representations of CKM matrix starting with each of the 9 elements of the matrix. The relationship of these independently constructed representations with the already available ones in the literature has been compared and discussed. Further, the implications of these representations have been explored for some of the CKM parameters such as δ, J and εk. Interestingly, we find that the PDG representation which is equivalent to our first representation seems to be most appropriate to incorporate the hierarchy of the elements of the CKM matrix as well as to describe the related phenomenology.
{"title":"Revisiting representations of quark mixing matrix","authors":"Gurjit Kaur, Aakriti Bagai, Gulsheen Ahuja, Manmohan Gupta","doi":"10.1093/ptep/ptae101","DOIUrl":"https://doi.org/10.1093/ptep/ptae101","url":null,"abstract":"Using unitarity, unlike the approaches available in the literature, we have constructed 9 independent representations of CKM matrix starting with each of the 9 elements of the matrix. The relationship of these independently constructed representations with the already available ones in the literature has been compared and discussed. Further, the implications of these representations have been explored for some of the CKM parameters such as δ, J and εk. Interestingly, we find that the PDG representation which is equivalent to our first representation seems to be most appropriate to incorporate the hierarchy of the elements of the CKM matrix as well as to describe the related phenomenology.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Asymptotic WGC has been proposed as a special case of the tower WGC that probes infinite distances in the moduli space corresponding to weakly coupled gauge regimes. The conjecture has been studied in M-theory on Calabi-Yau threefold (CY3) with finite volume inducing a 5D effective QFT. In this paper, we extend the scope of the previous study to encompass lower dimensions, particularly we generalise the obtained 5D asymptotic WGC to the effective field theory (EFT$_{3D}$) coupled to 3D gravity that descends from M-theory compactified on Calabi-Yau fourfold with an emphasis on $K3times K3$. We find that the CY4 has three fibration structures labelled as line Type-$mathbb {T}^{2}$, surface Type-$mathbb {S}$ and bulk Type-$mathbb {V}$. The emergent EFT$_{3D}$ is shown to have 2+2 towers of particles states termed as the BPS $mathcal {T}_{M_{mathrm{k}}rightarrow 0}^{rm{small {BPS}}}$ and $mathcal {T}_{M_{mathrm{k}}rightarrow infty }^{rm{small {BPS}}}$ as well as the non-BPS $mathcal {T}_{M_{mathrm{k}}rightarrow 0}^{rm{small {N-BPS}}}$ and $mathcal {T}_{M_{mathrm{k}}rightarrow infty }^{rm{small {N-BPS}}}$. To ensure the viability of the 3D Asymptotic WGC, we give explicit calculations to thoroughly test the swampland constraint for both the weakly and strongly gauge coupled regimes. Additional aspects, including the gauge symmetry breaking and duality symmetry are also investigated.
{"title":"Asymptotic Weak Gravity Conjecture in M-theory on K3 × K3","authors":"M Charkaoui, R Sammani, E H Saidi, R Ahl Laamara","doi":"10.1093/ptep/ptae100","DOIUrl":"https://doi.org/10.1093/ptep/ptae100","url":null,"abstract":"The Asymptotic WGC has been proposed as a special case of the tower WGC that probes infinite distances in the moduli space corresponding to weakly coupled gauge regimes. The conjecture has been studied in M-theory on Calabi-Yau threefold (CY3) with finite volume inducing a 5D effective QFT. In this paper, we extend the scope of the previous study to encompass lower dimensions, particularly we generalise the obtained 5D asymptotic WGC to the effective field theory (EFT$_{3D}$) coupled to 3D gravity that descends from M-theory compactified on Calabi-Yau fourfold with an emphasis on $K3times K3$. We find that the CY4 has three fibration structures labelled as line Type-$mathbb {T}^{2}$, surface Type-$mathbb {S}$ and bulk Type-$mathbb {V}$. The emergent EFT$_{3D}$ is shown to have 2+2 towers of particles states termed as the BPS $mathcal {T}_{M_{mathrm{k}}rightarrow 0}^{rm{small {BPS}}}$ and $mathcal {T}_{M_{mathrm{k}}rightarrow infty }^{rm{small {BPS}}}$ as well as the non-BPS $mathcal {T}_{M_{mathrm{k}}rightarrow 0}^{rm{small {N-BPS}}}$ and $mathcal {T}_{M_{mathrm{k}}rightarrow infty }^{rm{small {N-BPS}}}$. To ensure the viability of the 3D Asymptotic WGC, we give explicit calculations to thoroughly test the swampland constraint for both the weakly and strongly gauge coupled regimes. Additional aspects, including the gauge symmetry breaking and duality symmetry are also investigated.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
A closed string worldsheet of genus g with n punctures can be presented as a contact interaction in which n semi-infinite cylinders are glued together in a specific way via the Strebel differential on it, if n ≥ 1, 2g − 2 + n > 0. We construct a string field theory of closed strings such that all the Feynman diagrams are represented by such contact interactions. In order to do so, we define off-shell amplitudes in the underlying string theory using the combinatorial Fenchel-Nielsen coordinates to describe the moduli space and derive a recursion relation satisfied by them. Utilizing the Fokker-Planck formalism, we construct a string field theory from which the recursion relation can be deduced through the Schwinger-Dyson equation. The Fokker-Planck Hamiltonian consists of kinetic terms and three string interaction terms.
如果n≥1，2g - 2 + n > 0，则一个具有n个穿刺的g属封闭弦世界表可以呈现为一个接触相互作用，其中n个半无限圆柱体通过其上的斯特雷贝尔微分以特定方式粘合在一起。我们构建了一个封闭弦的弦场理论，使得所有费曼图都由这种接触相互作用表示。为此，我们在底层弦理论中定义了壳外振幅，使用组合芬切尔-尼尔森坐标来描述模空间，并推导出它们所满足的递推关系。利用福克-普朗克形式主义，我们构建了弦场论，并通过施温格-戴森方程推导出递归关系。福克-普朗克哈密顿由动力学项和三个弦相互作用项组成。
{"title":"Strebel differentials and string field theory","authors":"Nobuyuki Ishibashi","doi":"10.1093/ptep/ptae099","DOIUrl":"https://doi.org/10.1093/ptep/ptae099","url":null,"abstract":"A closed string worldsheet of genus g with n punctures can be presented as a contact interaction in which n semi-infinite cylinders are glued together in a specific way via the Strebel differential on it, if n ≥ 1, 2g − 2 + n > 0. We construct a string field theory of closed strings such that all the Feynman diagrams are represented by such contact interactions. In order to do so, we define off-shell amplitudes in the underlying string theory using the combinatorial Fenchel-Nielsen coordinates to describe the moduli space and derive a recursion relation satisfied by them. Utilizing the Fokker-Planck formalism, we construct a string field theory from which the recursion relation can be deduced through the Schwinger-Dyson equation. The Fokker-Planck Hamiltonian consists of kinetic terms and three string interaction terms.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500708","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
We consider an Einstein-Dirac-Maxwell system with two charged massless spinors coupled with an electromagnetic field, and construct a family of exact solutions to the system. The solution spacetime is an anisotropic generalization of the static Einstein universe which has a global cosmic magnetic field generated by the current of the spinors. The magnetic field is a force-free field that has played an important role in the study of cosmic magnetic fields. Our exact solution is regarded as a toy model which describes global cosmic magnetic phenomena in the early universe. The spinors are induced from Sasakian quasi-Killing spinors, and the total Dirac current flows along fibers of the Hopf-fibration. The magnetic field is a contact magnetic field.
{"title":"Anisotropic einstein universes with a global magetic field and SqK-spinors","authors":"Satsuki Matsuno, Fumihiro Ueno","doi":"10.1093/ptep/ptae098","DOIUrl":"https://doi.org/10.1093/ptep/ptae098","url":null,"abstract":"We consider an Einstein-Dirac-Maxwell system with two charged massless spinors coupled with an electromagnetic field, and construct a family of exact solutions to the system. The solution spacetime is an anisotropic generalization of the static Einstein universe which has a global cosmic magnetic field generated by the current of the spinors. The magnetic field is a force-free field that has played an important role in the study of cosmic magnetic fields. Our exact solution is regarded as a toy model which describes global cosmic magnetic phenomena in the early universe. The spinors are induced from Sasakian quasi-Killing spinors, and the total Dirac current flows along fibers of the Hopf-fibration. The magnetic field is a contact magnetic field.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
A simple procedure is established to optimize fundamental design parameters of a high-intensity hadron linac where interparticle Coulomb interaction plays a crucial role. Based on the recently proposed semi-empirical resonance condition, a stability map is constructed which reveals potentially dangerous operating regions in tune space. The map is shown to be consistent with numerical data obtained from more complicated approaches. The effectiveness of the new design scheme is demonstrated through systematic particle-in-cell simulations assuming the most typical structure of an Alvarez-type drift tube linac. The present results suggest that the so-called equipartitioning condition, which has often been taken very seriously in high-intensity linac designs, is not necessarily met to guarantee the best machine performance. The basic design concept described here can be applied not only to linacs but also to circular machines.
{"title":"Simple design criterion for high-intensity hadron linacs","authors":"A. Kasagaki, H. Okamoto","doi":"10.1093/ptep/ptae090","DOIUrl":"https://doi.org/10.1093/ptep/ptae090","url":null,"abstract":"\u0000 A simple procedure is established to optimize fundamental design parameters of a high-intensity hadron linac where interparticle Coulomb interaction plays a crucial role. Based on the recently proposed semi-empirical resonance condition, a stability map is constructed which reveals potentially dangerous operating regions in tune space. The map is shown to be consistent with numerical data obtained from more complicated approaches. The effectiveness of the new design scheme is demonstrated through systematic particle-in-cell simulations assuming the most typical structure of an Alvarez-type drift tube linac. The present results suggest that the so-called equipartitioning condition, which has often been taken very seriously in high-intensity linac designs, is not necessarily met to guarantee the best machine performance. The basic design concept described here can be applied not only to linacs but also to circular machines.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141344661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
Tahira Yasmeen, Ishtiaq Ahmed, Saba Shafaq, Muhammad Arslan, Muhammad Jamil Aslam
The experimental studies of the observables associated with the b → c transitions in the semileptonic B − meson decays at BaBar, Belle and LHCb have shown some deviations from the Standard Model (SM) predictions, consequently, providing a handy tool to probe the possible new physics (NP). In this context, we have first revisited the impact of recent measurements of R(D(*)) and R(Λc) on the parametric space of the NP scenarios. In addition, we have included the R(J/ψ) data in the analysis and found that their influence on the best-fit points and the parametric space is mild. Using the recent HFLAV data, after validating the well established sum rule of R(Λc), we derived the similar sum rule for R(J/ψ). Furthermore, according to the updated data, we have modified the correlation among the different observables, giving us their interesting interdependence. Finally, to discriminate the various NP scenarios, we have plotted the different angular observables and their ratios for B → D*τντ against the transfer momentum square (q2), using the 1σ and 2σ parametric space of considered NP scenarios. By implementing the collider bounds on NP Wilson coefficients, we find that, in the parametric space of some NP WCs is significantly restrained. To see the clear influence of NP on the amplitude of the angular observables, we have also calculated their numerical values in different q2 bins and shown them through the bar plots. We hope their precise measurements will help to discriminate various NP scenarios.
{"title":"Probing New Physics in light of recent developments in b → cℓν transitions","authors":"Tahira Yasmeen, Ishtiaq Ahmed, Saba Shafaq, Muhammad Arslan, Muhammad Jamil Aslam","doi":"10.1093/ptep/ptae086","DOIUrl":"https://doi.org/10.1093/ptep/ptae086","url":null,"abstract":"The experimental studies of the observables associated with the b → c transitions in the semileptonic B − meson decays at BaBar, Belle and LHCb have shown some deviations from the Standard Model (SM) predictions, consequently, providing a handy tool to probe the possible new physics (NP). In this context, we have first revisited the impact of recent measurements of R(D(*)) and R(Λc) on the parametric space of the NP scenarios. In addition, we have included the R(J/ψ) data in the analysis and found that their influence on the best-fit points and the parametric space is mild. Using the recent HFLAV data, after validating the well established sum rule of R(Λc), we derived the similar sum rule for R(J/ψ). Furthermore, according to the updated data, we have modified the correlation among the different observables, giving us their interesting interdependence. Finally, to discriminate the various NP scenarios, we have plotted the different angular observables and their ratios for B → D*τντ against the transfer momentum square (q2), using the 1σ and 2σ parametric space of considered NP scenarios. By implementing the collider bounds on NP Wilson coefficients, we find that, in the parametric space of some NP WCs is significantly restrained. To see the clear influence of NP on the amplitude of the angular observables, we have also calculated their numerical values in different q2 bins and shown them through the bar plots. We hope their precise measurements will help to discriminate various NP scenarios.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}
We propose a minimal extended seesaw scheme based on the discrete symmetry A4 × Z4 × Z2 × Z8 which can successfully address neutrino phenomenology and keV sterile neutrino dark matter. The lepton mass hierarchy is naturally achieved. Active neutrino mixing angles can reached the best-fit points with the predictive Dirac CP violation phase. The active-sterile mixing matrix elements are small enough to access the observed cosmological dark matter abundance constraint with keV sterile neutrino dark matter. The effective neutrino masses are predicted to be in the ranges of the recent experimental limits.
{"title":"Neutrino phenomenology and keV dark matter in 2HDM with A4 symmetry","authors":"V V Vien","doi":"10.1093/ptep/ptae089","DOIUrl":"https://doi.org/10.1093/ptep/ptae089","url":null,"abstract":"We propose a minimal extended seesaw scheme based on the discrete symmetry A4 × Z4 × Z2 × Z8 which can successfully address neutrino phenomenology and keV sterile neutrino dark matter. The lepton mass hierarchy is naturally achieved. Active neutrino mixing angles can reached the best-fit points with the predictive Dirac CP violation phase. The active-sterile mixing matrix elements are small enough to access the observed cosmological dark matter abundance constraint with keV sterile neutrino dark matter. The effective neutrino masses are predicted to be in the ranges of the recent experimental limits.","PeriodicalId":20710,"journal":{"name":"Progress of Theoretical and Experimental Physics","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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