Thu·Dec 26, 2019Thursday·December 26, 2019

1. 01*

   Cornering Spontaneous CP Violation with Charged-Higgs Searches

   Ulrich Nierste🇩🇪 · Mustafa Tabet🇩🇪 · Robert Ziegler🇩🇪

   Decades of precision measurements have firmly established the Kobayashi-Maskawa phase as the dominant source of the CP violation observed in weak quark decays. However, it is still unclear whether CP violation is explicitly encoded in complex Yukawa matrices or instead stems from spontaneous symmetry breaking with underlying CP-conserving Yukawa and Higgs sectors. Here we study the latter possibility for the case of a generic two-Higgs-doublet model. We find that theoretical constraints limit the ratio $t_{\beta }$ of the vacuum expectation values to the range $0.22\le t_{\beta }\le 4.5$ and imply the upper bounds $M_{H^{\pm }}\le 435$ GeV, $M_{H_2^0}\le 485$ GeV and $M_{H_3^0}\le 545$ GeV for the charged and extra neutral Higgs masses. We derive lower bounds on charged-Higgs couplings to bottom quarks which provide a strong motivation to study the non-standard production and decay signatures $pp\to qb{H}^{\pm }(\to q^{\prime }b)$ with all flavors $q,q^{\prime }=u,c,t$ in the search for the charged Higgs boson. We further present a few benchmark scenarios with interesting discovery potential in collider analyses.

   hep-phPRL(2020)·24 citations
2. 02*

   Breaking of the tetra-maximal neutrino mixing pattern

   Newton Nath🇲🇽

   We make an attempt to study the present status of the tetra-maximal neutrino mixing (TMM) pattern. It predicts all the three leptonic mixing angles ${\theta }_{13}\approx 8.4^{\circ },{\theta }_{12}\approx 30.4^{\circ },$ and ${\theta }_{23}=45^{\circ }$ together with the three CP-violating phases $-\delta =\rho =\sigma =90^{\circ }$. However, the latest global analysis of neutrino oscillation data prefer relatively higher best-fit value of ${\theta }_{12}$ as well as non-maximal values of both ${\theta }_{23},\delta$. In order to explain the realistic data, we study the breaking of TMM pattern. We first examine the breaking of TMM due to renormalization group (RG) running effects and then study the impact of explicit breaking terms. We also examine the effect of RG-induced symmetry breaking on the effective Majorana neutrino mass in neutrinoless double beta decay experiments.

   hep-phNPB(2020)·1 citation
3. 03*

   The $\sigma$ and $\rho$ coupling constants for the charmed and beauty mesons

   Hee-Jin Kim🇰🇷 · Hyun-Chul Kim

   We investigate the $\sigma$ and $\rho$ coupling constants for the $DD$ and $D^{\ast }{D}^{\ast }$ interactions, based on correlated $2\pi$ exchange in the $DD$ and $D^{\ast }{D}^{\ast }$ interactions. Starting from the $D\bar{D}\to \pi \pi$ and $D^{\ast }{\bar{D}}^{\ast }\to \pi \pi$ amplitudes derived in the pseudophysical region ($4m_{\pi }^2\le t\le 52m_{\pi }^2$) with the $S$- and $P$-wave $2\pi$ correlations considered, we obtain the spectral functions for the $DD\to DD$ and $D^{\ast }{D}^{\ast }\to D^{\ast }{D}^{\ast }$ amplitude with correlated $S$- and $P$-wave $2\pi$ exchanges. Using the pole approximation, we estimate the $DD\sigma$, $DD\rho$, $D^{\ast }{D}^{\ast }\sigma$, and $D^{\ast }{D}^{\ast }\rho$ coupling constants. We extended phenomenologically the present results to the region in $t\le 0$ and compare them with those from lattice QCD. The results are also compared with those of other models. We also present the results of the $BB\sigma$, $BB\rho$, $B^{\ast }{B}^{\ast }\sigma$, and $B^{\ast }{B}^{\ast }\rho$ coupling constants. We observe that it is unlikely that the $\sigma$ and $\rho$ coupling constants for the $B$ and $B^{\ast }$ mesons are the same as those for the $D$ and $D^{\ast }$ mesons. On the contrary, they are quite larger than those for the charmed mesons.

   hep-phhep-exhep-latnucl-thPRD(2020)·9 citations
4. 04*

   The pseudoscalar meson and baryon octet interaction in the unitary coupled-channel approximation

   Bao-Xi Sun🇨🇳 · Zheng-Ran Zhang🇨🇳 · Hai-Lin Wu🇨🇳 · Si-Yu Zhao🇨🇳 · Fang-Yong Dong🇨🇳

   The pseudoscalar meson-baryon octet interaction is studied within a nonlinear realized Lagrangian, and then the Bethe-Salpeter equation is solved in the unitary coupled-channel approximation. In sector of strangeness $S=-1$ and isospin $I=0$, only one pole is generated dynamically in the 1400MeV region, which might correspond to the $\Lambda (1405)$ particle. When the case of strangeness zero is studied, the $s-$ and $u-$ potentials are taken into account in the kernel, and a resonance state is produced in the 1500MeV region, which might be a counterpart of the N(1535) particle.

   hep-ph0 citations
5. 05*

   Holographic Technicolor Model and Dark Matter

   Yidian Chen🇨🇳 · Xiao-Jun Bi🇨🇳 · Mei Huang🇨🇳

   We investigate the strongly coupled minimal walking technicolor model (MWT) in the framework of a bottom-up holographic model, where the global $SU(4)$ symmetry breaks to $SO(4)$ subgroup. In the holographic model, we found that 125GeV composite Higgs particles and small Peskin-Takeuchi $S$ parameter can be achieved simultaneously. In addition, the model predicts a large number of particles at the TeV scale, including dark matter candidate Technicolor Interacting Massive Particles (TIMPs). If we consider the dark matter nuclear spin-independent cross-section in the range of $10^{-45}\sim 10^{-48}$cm${}^2$, which can be detected by future experiments, the mass range of TIMPs predicted by the holographic technicolor model is 2 $\sim$ 4 TeV.

   hep-phCPC(2020)·1 citation
6. 06*

   Implications of last NA64 results and the electron $g_e-2$ anomaly for the X(16.7) boson survival

   N.V. Krasnikov🇷🇺

   We point out that last NA64 bound on coupling constant of hypothetical $X(16.7MeV)$ vector boson with electrons plus the recent value of the anomalous electron magnetic moment exclude at 90 \% C.L. purely vector or axial vector couplings of $X(16.7)$ boson with electrons. Models with nonzero $V\pm A$ coupling constant with electron survive and they can explain both the electron and muon $g-2$ anomalies.

   hep-phMod.Phys.Lett.A(2020)·11 citations
7. 07*

   Probing vacuum polarization effects with high-intensity lasers

   Felix Karbstein🇩🇪

   These notes provide a pedagogical introduction to the theoretical study of vacuum polarization effects in strong electromagnetic fields as provided by state-of-the-art high-intensity lasers. Quantum vacuum fluctuations give rise to effective couplings between electromagnetic fields, thereby supplementing Maxwell's linear theory of classical electrodynamics with nonlinearities. Resorting to a simplified laser pulse model allowing for explicit analytical insights, we demonstrate how to efficiently analyze all-optical signatures of these effective interactions in high-intensity laser experiments. Moreover, we highlight several key features relevant for the accurate planning and quantitative theoretical analysis of quantum vacuum nonlinearities in the collision of high-intensity laser pulses.

   hep-phParticles(2020)·75 citations
8. 08*

   Prospects for improving cosmological parameter estimation with gravitational-wave standard sirens from Taiji

   Ze-Wei Zhao🇨🇳 · Ling-Feng Wang🇨🇳 · Jing-Fei Zhang🇨🇳 · Xin Zhang🇨🇳

   Taiji, a space-based gravitational-wave observatory, consists of three satellites forming an equilateral triangle with arm length of $3\times 10^6$ km, orbiting around the Sun. Taiji is able to observe the gravitational-wave standard siren events of massive black hole binary (MBHB) merger, which is helpful in probing the expansion of the universe. In this paper, we preliminarily forecast the capability of Taiji for improving cosmological parameter estimation with the gravitational-wave standard siren data. We simulate five-year standard siren data based on three fiducial cosmological models and three models of MBHB's formation and growth. It is found that the standard siren data from Taiji can effectively break the cosmological parameter degeneracies generated by the cosmic microwave background (CMB) anisotropies data, especially for dynamical dark energy models. The constraints on cosmological parameters are significantly improved by the data combination CMB+Taiji, compared to the CMB data alone. Compared to the current optical cosmological observations, Taiji can still provide help in improving the cosmological parameter estimation to some extent. In addition, we consider an ideal scenario to investigate the potential of Taiji on constraining cosmological parameters. We conclude that the standard sirens of MBHB from Taiji will become a powerful cosmological probe in the future.

   ↳ astro-ph.COgr-qchep-phSci.Bull.(2020)·74 citations
9. 09*

   Subgroup Of Finite Renormalizations, Conserving The NSVZ Relation In $\mathcal{N}=1$ SQED

   I.O.Goriachuk🇷🇺 · A.L.Kataev🇷🇺

   In supersymmetric quantum electrodynamics there is the exact relation between the expressed through the unrenormalized coupling gauge beta-function and the anomalous dimension of matter superfields. In the present report we describe the subgroup of general renormalization group transformations, conserving this relation exactly in all orders of the perturbation theory in terms of the renormalized coupling constant.

   ↳ hep-thhep-ph2 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.