Pub Date : 2020-11-25DOI: 10.1007/978-981-33-4408-2_34
N. Kumar
{"title":"Flavor Violation at LHC in Events with Two Opposite Sign Leptons and a B-Jet","authors":"N. Kumar","doi":"10.1007/978-981-33-4408-2_34","DOIUrl":"https://doi.org/10.1007/978-981-33-4408-2_34","url":null,"abstract":"","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88697375","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}
Pub Date : 2020-11-25DOI: 10.1103/PHYSREVD.103.075024
M. Bauer, P. Foldenauer, Martin Mosny
Extensions of the Standard Model with an abelian gauge group are constrained by gauge anomaly cancellation, so that only a limited number of possible charge assignments is allowed without the introduction of new chiral fermions. For flavour universal charges, couplings of the associated hidden photon to Standard Model fermions are flavour conserving at tree-level. We show explicitly that even the flavour specific charge assignments allowed by anomaly cancellation condition lead to flavour conserving tree-level couplings of the hidden photon to quarks and charged leptons emph{if} the CKM or PMNS matrix can be successfully reconstructed. Further, loop-induced flavour changing couplings are strongly suppressed. As a consequence, the structure of the Majorana mass matrix is constrained and flavour changing tree-level couplings of the hidden photon to neutrino mass eigenstates are identified as a means to distinguish the $U(1)_{B-L}$ gauge boson from any other anomaly-free extension of the Standard Model without new chiral fermions. We present a comprehensive analysis of constraints and projections for future searches for a $U(1)_{B-3L_i}$ gauge boson, calculate the reach of resonance searches in $B$ meson decays and comment on the implications for non-standard neutrino interactions.
{"title":"Flavor structure of anomaly-free hidden photon models","authors":"M. Bauer, P. Foldenauer, Martin Mosny","doi":"10.1103/PHYSREVD.103.075024","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.075024","url":null,"abstract":"Extensions of the Standard Model with an abelian gauge group are constrained by gauge anomaly cancellation, so that only a limited number of possible charge assignments is allowed without the introduction of new chiral fermions. For flavour universal charges, couplings of the associated hidden photon to Standard Model fermions are flavour conserving at tree-level. We show explicitly that even the flavour specific charge assignments allowed by anomaly cancellation condition lead to flavour conserving tree-level couplings of the hidden photon to quarks and charged leptons emph{if} the CKM or PMNS matrix can be successfully reconstructed. Further, loop-induced flavour changing couplings are strongly suppressed. As a consequence, the structure of the Majorana mass matrix is constrained and flavour changing tree-level couplings of the hidden photon to neutrino mass eigenstates are identified as a means to distinguish the $U(1)_{B-L}$ gauge boson from any other anomaly-free extension of the Standard Model without new chiral fermions. We present a comprehensive analysis of constraints and projections for future searches for a $U(1)_{B-3L_i}$ gauge boson, calculate the reach of resonance searches in $B$ meson decays and comment on the implications for non-standard neutrino interactions.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84274185","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}
Pub Date : 2020-11-25DOI: 10.1103/PhysRevC.104.015204
Jiayu Wu, Yanbing Cai, W. Xiang
The inclusive $J/Psi$, $Psi(2S)$ and $Upsilon(1S)$ direct and resolved photoproduction are investigated by including the quark subprocesses in the framework of non-relativistic quantum chromodynamics (NRQCD). We find that the theoretical total cross section of heavy quarkonium productions are in good agreement with the data available at HERA, once the $gamma q$, $qg$ and $qq$ subprocesses in the heavy quark pair productions are taken into account. The inclusive diffractive rapidity and transverse momentum distributions of $J/Psi$, $Psi(2S)$ and $Upsilon(1S)$ in $pp$, $pPb$ and $PbPb$ collisions at LHC are also studied by our quark improved NRQCD model combined with the resolved pomeron model. We find that the contributions from the quark involved subprocesses can reach to $8%$ in the rapidity distribution and $6%$ in the transverse momentum distribution. The numerical results show that the contributions from quark involved subprocesses are significant in heavy quarkonium photoprodution.
{"title":"Inclusive diffractive heavy quarkonium photoproduction including quark subprocesses","authors":"Jiayu Wu, Yanbing Cai, W. Xiang","doi":"10.1103/PhysRevC.104.015204","DOIUrl":"https://doi.org/10.1103/PhysRevC.104.015204","url":null,"abstract":"The inclusive $J/Psi$, $Psi(2S)$ and $Upsilon(1S)$ direct and resolved photoproduction are investigated by including the quark subprocesses in the framework of non-relativistic quantum chromodynamics (NRQCD). We find that the theoretical total cross section of heavy quarkonium productions are in good agreement with the data available at HERA, once the $gamma q$, $qg$ and $qq$ subprocesses in the heavy quark pair productions are taken into account. The inclusive diffractive rapidity and transverse momentum distributions of $J/Psi$, $Psi(2S)$ and $Upsilon(1S)$ in $pp$, $pPb$ and $PbPb$ collisions at LHC are also studied by our quark improved NRQCD model combined with the resolved pomeron model. We find that the contributions from the quark involved subprocesses can reach to $8%$ in the rapidity distribution and $6%$ in the transverse momentum distribution. The numerical results show that the contributions from quark involved subprocesses are significant in heavy quarkonium photoprodution.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88512465","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}
T. P. Nguyen, T. T. Thuc, D. T. Si, T.T.Hong, L. T. Hue
An extension of the two Higgs doublet model including inverse seesaw neutrinos and neutral Higgs bosons was constructed based on the $A_4$ symmetry in order to explain the recent neutrino oscillation data. This model can distinguish two well-known normal and inverted order schemes of neutrino data once both the effective masses $m_{beta}$ in tritium beta decays and $langle mrangle$ in the neutrinoless double beta decay are observed. The lepton flavor violating decays of the charged leptons $e_brightarrow e_agamma$, $murightarrow3e$, the Standard model-like Higgs boson decays $hrightarrow e_be_a$, and the $mu$-e conversions in some nuclei arise from loop corrections. The experimental data of the branching ratio Br$(murightarrow egamma, 3e)$ predicts that the upper bounds of Br$(tau rightarrow mugamma,egamma)$ and Br$(hrightarrow e_{a}e_b)$ are much smaller than the planned experimental sensitivities. In contrast, the $mu$-e conversions are the promising signals for experiments.
{"title":"Low energy phenomena of the lepton sector in an $A_4$ symmetry model with heavy inverse seesaw neutrinos","authors":"T. P. Nguyen, T. T. Thuc, D. T. Si, T.T.Hong, L. T. Hue","doi":"10.1093/ptep/ptac002","DOIUrl":"https://doi.org/10.1093/ptep/ptac002","url":null,"abstract":"An extension of the two Higgs doublet model including inverse seesaw neutrinos and neutral Higgs bosons was constructed based on the $A_4$ symmetry in order to explain the recent neutrino oscillation data. This model can distinguish two well-known normal and inverted order schemes of neutrino data once both the effective masses $m_{beta}$ in tritium beta decays and $langle mrangle$ in the neutrinoless double beta decay are observed. The lepton flavor violating decays of the charged leptons $e_brightarrow e_agamma$, $murightarrow3e$, the Standard model-like Higgs boson decays $hrightarrow e_be_a$, and the $mu$-e conversions in some nuclei arise from loop corrections. The experimental data of the branching ratio Br$(murightarrow egamma, 3e)$ predicts that the upper bounds of Br$(tau rightarrow mugamma,egamma)$ and Br$(hrightarrow e_{a}e_b)$ are much smaller than the planned experimental sensitivities. In contrast, the $mu$-e conversions are the promising signals for experiments.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90028978","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}
Pub Date : 2020-11-22DOI: 10.1103/PHYSREVD.103.L021501
Bo Wang, L. Meng, Shi-Lin Zhu
We study the newly observed charmoniumlike state $Z_{cs}(3985)$ in the framework of chiral effective field theory. The interaction kernel of the $bar{D}_sD^ast/bar{D}^ast_sD$ system is calculated up to the next-to-leading order with the explicit chiral dynamics. With the fitted parameters extracted from the $Z_c(3900)$ data as inputs, the mass, width and event distributions of the $Z_{cs}(3985)$ are very consistent with the experimental measurements. Our studies strongly support the $Z_{cs}(3985)$ as the partner of the $Z_c(3900)$ in the SU(3)$_f$ symmetry and the $bar{D}_sD^ast/bar{D}^ast_sD$ molecular resonance with the same dynamical origin as the other charged heavy quarkoniumlike states. We precisely predict the resonance parameters of the unobserved states in $bar{D}_s^ast D^ast$, $B^ast_s bar{B}/B_sbar{B}^ast$ and $B_s^astbar{B}^ast$ systems, and establish a complete spectrum of the charged charmoniumlike and bottomoniumlike states with the $I(J^P)$ quantum numbers $1(1^+)$ and $frac{1}{2}(1^+)$, respectively.
{"title":"Decoding the nature of \u0000Zcs(3985)\u0000 and establishing the spectrum of charged heavy quarkoniumlike states in chiral effective field theory","authors":"Bo Wang, L. Meng, Shi-Lin Zhu","doi":"10.1103/PHYSREVD.103.L021501","DOIUrl":"https://doi.org/10.1103/PHYSREVD.103.L021501","url":null,"abstract":"We study the newly observed charmoniumlike state $Z_{cs}(3985)$ in the framework of chiral effective field theory. The interaction kernel of the $bar{D}_sD^ast/bar{D}^ast_sD$ system is calculated up to the next-to-leading order with the explicit chiral dynamics. With the fitted parameters extracted from the $Z_c(3900)$ data as inputs, the mass, width and event distributions of the $Z_{cs}(3985)$ are very consistent with the experimental measurements. Our studies strongly support the $Z_{cs}(3985)$ as the partner of the $Z_c(3900)$ in the SU(3)$_f$ symmetry and the $bar{D}_sD^ast/bar{D}^ast_sD$ molecular resonance with the same dynamical origin as the other charged heavy quarkoniumlike states. We precisely predict the resonance parameters of the unobserved states in $bar{D}_s^ast D^ast$, $B^ast_s bar{B}/B_sbar{B}^ast$ and $B_s^astbar{B}^ast$ systems, and establish a complete spectrum of the charged charmoniumlike and bottomoniumlike states with the $I(J^P)$ quantum numbers $1(1^+)$ and $frac{1}{2}(1^+)$, respectively.","PeriodicalId":8457,"journal":{"name":"arXiv: High Energy Physics - Phenomenology","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79030285","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}