We consider a three Higgs doublet model with an S 3 symmetry in which beside the SM-like doublet there are two fermiophobic doublets. Due to the new charged scalars there is an enhancement in the two-photon decay while the other channels have the same decay widths that the SM neutral Higgs. The fermiophobic scalars are mass degenerated unless soft terms breaking the S 3 symmetry are added.
Viral diseases are among the most limiting factors in the production of potato in Colombia and the rest of the world. The best strategy to control plant viruses consists on the use of certified seed tubers, control of arthropod vectors and the use of adequate crop management practices that reduce mechanical transmission and the presence of viral reservoirs like weeds and volunteer plants. However, the successful implementation of these practices relies on the availability of highly sensitive techniques that allow for the asymptomatic detection of viruses. In this work, we tested the performance of Next-generation sequencing (NGS) and real time RT-PCR (RT-qPCR) on a single volunteer potato plant (cv. Diacol-Capiro) growing naturally in a seed-tuber storage facility in Yarumal (Antioquia). Our NGS results demonstrate a mixed infection with Potato virus Y (PVY) and Potato leafroll virus (PLRV). RT-qPCR was performed in roots, main stolons, crown (root collar) and upper, middle and lower leaves using specific primers for PVY, PLRV, Potato virus S (PVS), Potato virus V (PVV), Potato virus X (PVX) and Potato yellow vein virus (PYVV). Only PVY and PLRV were detected in good agreement with the NGS data. This work demonstrates the usefulness of both techniques for supporting integrated management of plant viruses in potato, including virus detection in natural reservoirs such as volunteer plants and weeds.
The D0 experiment has reported a direct search for a charged Higgs boson produced by qq annihilation and decaying to tb final state, in the 180 ≤ M H + ≤ 300 GeV mass range. The analysis has lead to upper limits on the production cross section in the framework of the two Higgs doublet model types I, II and III. We compare the predictions of two different scenarios in the framework of the two Higgs doublet type III to the cross section limits reported by D0 collaboration, and we obtain constraints on the charged Higgs mass, for the case when the charged Higgs mass is bigger than the top quark mass. Also, searches for the charged Higgs boson with a mass smaller than top quark mass are considered, we discuss the possible limits on the charged Higgs boson mass obtained from measurements of the ratio R σ = σ l+jets tt /σ dileptons tt within the two Higgs doublet model type III.
The most commonly used parameterizations of the Yukawa couplings in the two Higgs doublet model are revisited. Their similitudes and differences are emphasized and relations between the different notations used in the literature are derived. Using these relations, bounds on the space of parameters of the charged Higgs sector of the two Higgs doublet model are obtained. These constraints are obtained from flavor observables like the measurement of B → X s γ and the recent measurement of B s → µ + µ − from LHCb. The ratio R H + = B(H + → τ +ν τ )/B(H + → tb) is evaluated for the two Higgs doublet model type-III and type-II, and their differences are quantified.One simple framework beyond the standard model (SM) consists in adding a Higgs doublet, leading to a rich Higgs sector spectrum and therefore, giving a richer phenomenology than in the SM [1,2]. This model is usually called the Two Higgs doublet Model (THDM). In the THDM there are three Goldstone bosons that give masses to the gauge bosons and there are also five Higgs bosons: two CP-even neutral Higgs bosons, one CP-odd neutral Higgs boson and two charged Higgs bosons.There are multiple ways to implement this kind of SM extension. These ways depend on how the couplings between the Higgs bosons and the fermions are chosen. They should be chosen carefully in order to avoid Flavor Changing Neutral Currents (FCNC) which are generated at the tree level in the most general version of the THDM, the so called type-III THDM. In contrast, models like the type-I and II THDM impose an additional discrete symmetry in order to avoid the FCNC at tree level [2]. In the type-I model, the couplings between the Higgs bosons and the fermions are chosen such that only one Higgs doublet couples to the SM fermions, whereas in the type-II model, one doublet couples with the up quark sector and the another one with the down quark sector. In the type-III model, although both Higgs doublets couple with the SM fermions, the model is still phenomenologically possible if the FCNC at tree level are suppressed [3].The THDM type-II has been studied more extensively in the literature, motivated by its similarities in the Higgs sector at tree level with the Minimal Supersymmetric Standard Model (MSSM), which requires a second Higgs doublet. However, due to quantum loop corrections, the Higgs sector will actually be described by an effective potential which is similar to the most general version of the THDM, the so-called type-III.From a phenomenological point of view, it is important to study the properties of the most general THDM. In this model, there are two Yukawa matrices per fermion type (up or down type quarks and leptons) which cannot be diagonalized simultaneously. There are two different ways to deal with the 1 arXiv:1205.5726v1 [hep-ph]
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