ApJ 954 (2023) 205 Recently, the region surrounding eHWC J1842-035 has been studied extensively
by gamma-ray observatories due to its extended emission reaching up to a few
hundred TeV and potential ...as a hadronic accelerator. In this work, we use 1,910
days of cumulative data from the High Altitude Water Cherenkov (HAWC)
observatory to carry out a dedicated systematic source search of the eHWC
J1842-035 region. During the search we have found three sources in the region,
namely, HAWC J1844-034, HAWC J1843-032, and HAWC J1846-025. We have identified
HAWC J1844-034 as the extended source that emits photons with energies up to
175 TeV. We compute the spectrum for HAWC J1844-034 and by comparing with the
observational results from other experiments, we have identified HESS
J1843-033, LHAASO J1843-0338, and TASG J1844-038 as very-high-energy gamma-ray
sources with a matching origin. Also, we present and use the multi-wavelength
data to fit the hadronic and leptonic particle spectra. We have identified four
pulsar candidates in the nearby region from which PSR J1844-0346 is found to be
the most likely candidate due to its proximity to HAWC J1844-034 and the
computed energy budget. We have also found SNR G28.6-0.1 as a potential
counterpart source of HAWC J1844-034 for which both leptonic and hadronic
scenarios are feasible.
We discuss flavor-violating constraints and consequently possible charged Higgs boson phenomenology emerging from a four-zero Yukawa texture embedded within the Type-III 2-Higgs Doublet Model ...(2HDM-III). Firstly, we show in detail how we can obtain several kinds of 2HDMs when some parameters in the Yukawa texture are absent. Secondly, we present a comprehensive study of the main B-physics constraints on such parameters induced by flavor-changing processes, in particular on the off-diagonal terms of such a texture: i.e., from \(\mu -e\) universality in \(\tau\) decays, several leptonic B-decays (\(B \to \tau \nu\), \(D \to \mu \nu\) and \(D_s \to {l} \nu\)), the semi-leptonic transition \(B\to D \tau \nu\), plus \(B \to X_s \gamma\), including \(B^0-\bar B^0\) mixing, \(B_s \to \mu^+ \mu^-\) and the radiative decay \(Z\to b \bar{b}\). Thirdly, having selected the surviving 2HDM-III parameter space, we show that the \(H^- c \bar{b}\) coupling can be very large over sizable expanses of it, in fact, a very different situation with respect to 2HDMs with a flavor discrete symmetry (i.e., \({\mathcal{Z}}_2\)) and very similar to the case of the Aligned-2HDM (A2HDM) as well as of models with three or more Higgs doublets. Fourthly, we study in detail the ensuing \(H^\pm\) phenomenology at the Large Hadron Collider (LHC), chiefly the \(c\bar b \to H^+\) production mode and the \(H^+\to c\bar b\) decay channel while assuming \(\tau^+\nu_\tau\) decays in the former and \(t\to bH^+\) production in the latter, showing that significant scope exists in both cases.
In this letter we analyse, in the context of the general 2-Higgs Doublet Model, the structure of the Yukawa matrices, \(\widetilde{ \bf Y}_{ _{1,2} }^{q}\), by assuming a four-zero texture ansatz for ...their definition. In this framework, we obtain compact expressions for \(\widetilde{ \bf Y}_{ _{1,2} }^{q}\), which are reduced to the Cheng and Sher ansatz with the difference that they are obtained naturally as a direct consequence of the invariants of the fermion mass matrices. Furthermore, in order to avoid large flavour violating effects coming from charged Higgs exchange, we consider the main flavour constraints on the off-diagonal terms of Yukawa texture {{\(\left( \widetilde{\chi}_{j}^q \right)_{kl}\)}} (\(k\neq l\)). We perform a \(\chi^2\)-fit based on current experimental data on the quark masses and the Cabibbo-Kobayashi-Maskawa mixing matrix \({ \bf V}_{\rm CKM }\). Hence, we obtain the allowed ranges for the parameters \(\widetilde{ \bf Y}_{ _{1,2} }^{q}\) at 1\(\sigma\) for several values of \(\tan \beta\). The results are in complete agreement with the bounds obtained taking into account constraints on Flavour Changing Neutral Currents reported in the literature.
We update the flavor-violating constraints on the charged Higgs sector of the 2-Higgs Doublet Model Type-III (2HDM-III), using a four-zero texture in the Yukawa matrices. We give a generic Lagrangian ...of the 2HDM-III. In order to show the relevance of the off-diagonal terms of such a texture, we utilize the main constraints from \(B\)-physics, \(\mu -e\) universality in \(\tau\) decays and the radiative decay \(Z\to b \bar{b}\) presented recently in arXiv:1212.6818 hep-ph. In particular, we show that the \(H^- c \bar{b}\) coupling can be very large and very different with respect to 2HDMs with a flavor discrete symmetry (i.e., \({\mathcal{Z}}_2\)). We also discuss the possible enhancements of the vertices \(H^\pm W^\mp V\) (\(V=Z, \gamma\)) that arise at one-loop level.
Recently, the region surrounding eHWC J1842-035 has been studied extensively by gamma-ray observatories due to its extended emission reaching up to a few hundred TeV and potential as a hadronic ...accelerator. In this work, we use 1,910 days of cumulative data from the High Altitude Water Cherenkov (HAWC) observatory to carry out a dedicated systematic source search of the eHWC J1842-035 region. During the search we have found three sources in the region, namely, HAWC J1844-034, HAWC J1843-032, and HAWC J1846-025. We have identified HAWC J1844-034 as the extended source that emits photons with energies up to 175 TeV. We compute the spectrum for HAWC J1844-034 and by comparing with the observational results from other experiments, we have identified HESS J1843-033, LHAASO J1843-0338, and TASG J1844-038 as very-high-energy gamma-ray sources with a matching origin. Also, we present and use the multi-wavelength data to fit the hadronic and leptonic particle spectra. We have identified four pulsar candidates in the nearby region from which PSR J1844-0346 is found to be the most likely candidate due to its proximity to HAWC J1844-034 and the computed energy budget. We have also found SNR G28.6-0.1 as a potential counterpart source of HAWC J1844-034 for which both leptonic and hadronic scenarios are feasible.
The Two Higgs Doublets Model (2HDM) has provided a very useful way to describe a minimal extension of the scalar sector of the Standard Model. In this work, it is shown a scheme that we call Partial ...Aligned Two Higgs Doublet Model (PA-2HDM) which allows a description of the distinct versions of the 2HDM in a simple way, including those with flavor symmetries. In addition, it is shown a method to diagonalize Yukawa matrices of four-zero texture coming from the 2HDM-III. We provide some phenomenological applications in order to show the model's predictive power.
We discuss the implications of assuming a four-zero Yukawa texture for the properties of the charged Higgs boson within the context of the general 2-Higgs Doublet Model of Type III. We present the ...charged Higgs boson couplings with heavy quarks and the resulting pattern for its decays, including the decay \(H^+ \to W^+ \gamma\) at 1-loop level. The parameters chosen can still avoid the \(B \to X_s \gamma\) constraint, the perturbativity and \(\rho_0\) bound. Also, we present the constraints of \( B0-\bar{B}0\) mixing and of the radiative corrections to the \(Z b \bar{b}\) vertex in the regime small \( \tan \beta\). The production of charged Higgs bosons is also sensitive to the modifications of its couplings, so that we also evaluate the resulting effects on `direct' \(c\bar{b}\to H^++c. c.\) and `indirect' \(q\bar q,gg\to \bar t b H^++c. c.\) production. Significant scope exists at the Large Hadron Collider for several \(H^\pm\) production and decay channels combined to enable one to distinguish between such a model and alternative 2-Higgs doublet scenarios.
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