Publications (100)273.27 Total impact
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ABSTRACT: Within the Inert Doublet Model (IDM) there is a viable dark matter candidate. This simple model can provide a strong enough first order phase transition, which is required in order to account for the matterantimatter asymmetry in the Universe (BAU). However, another necessary ingredient is missing, as there is no additional source of CP violation in the IDM, besides the standard CKM phase from the Standard Model. Additional CP violating phase can appear if a complex singlet of $SU(3)_C \times SU(2)_W \times U(1)_Y$ with a nonzero vacuum expectation value is added to the scalar sector of the IDM. We construct the scalar potential of the inert doublet plus singlet model (IDMS), assuming an exact $Z_2$ symmetry, with singlet being $Z_2$even. To simplify the model we use a softly broken $U(1)$ symmetry, which allows a reduction of the number of free parameters in the potential. We study the masses and interactions of scalar particles for a few benchmark scenarios. Constraints from collider physics, in particular from the Higgs signal observed at LHC with $M_h\approx 125$ GeV are discussed, as well as constraints from the dark matter experiments. 
Dataset: PRD 89, 093014 (2014)

Article: The oneloop decays ${A^0} \to ZZ, Z\gamma, \gamma\gamma$ within the 2HDM and its search at the LHC
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ABSTRACT: The general twohiggs doublet model (2HDM) contains a rich spectrum of neutral and charged Higgs bosons, whose detection would be a clear signal of new physics. When the Higgs potential is CPconserving, the spectrum includes a pseudoscalar mass eigenstate $A^{0}$, which does not couple to vector bosons at treelevel. However, fermionic loops (top and bottom mainly) induce the coupling $AVV'$ (with $V,V'=\gamma, Z$) at higher orders. We evaluate the amplitude for the decays ${A^0} \to ZZ, Z\gamma, \gamma\gamma$, including a generic fermionic loop contribution, and present results on the branching ratios for 2HDMI,II and III. Current LHC searches on heavy Higgs bosons are used as an estimate to constrain the allowed mass range for $A^0$.  [Show abstract] [Hide abstract]
ABSTRACT: The heaviness of the top quark makes its 2body decay mode $t \to bW^+$ to be dominant, at such level that hardly any other decay mode reaches a detectable branching ratio (BR) within the SM. Here we study the decay $t \to bW^+\ell^\ell^+$ ($\ell=e, \mu, \tau$), which diverges for massless leptons, and it can reach a BR $\sim \mathcal{O}(10^{5}\sim 10^{6})$ for reasonable values of the low energy cut in the leptonpair invariant mass. This rate surpasses almost any other rare decays such as $t \to cX$ ($X=\gamma,Z,g,H, W^+W^$), and thus offers the possibility of being detectable. Furthermore, the estimate of this channel is relevant because it can mimic the signal arising from the lepton number violating decay $t\to bW^\ell^+\ell^+$, when the $W$ boson decays into lepton channels.  [Show abstract] [Hide abstract]
ABSTRACT: We study the phenomena of flavor violation, and its implications for Higgs signals, within the context of the TwoHiggs doublet model with Textures (2HDMTx). Unlike previous works, where the set of Yukawa matrices are assumed to have the same form (parallel textures), we study combinations of Yukawa matrices with different textures (complementary textures) that produce a hermitian mass matrix with a specific fourzero texture type. In this case, the size of Flavor Violation depends on the parameters tan beta(= v_2/v_1) and gamma (0 < gamma < 1), that appears in the relation between the top mass and the 33 entry of the mass matrix. We find that in order to satisfy current experimental bounds from KK mixing, B_s > mu^+ mu^ and tau > mu mu mu, only restricted values of gamma and tan beta are allowed. Furthermore, we also study the constraints that arise from imposing current LHC bounds on the Higgs boson couplings. The predictions of our study include the Flavor Violating decays (h > tau mu) and t > c h, which reach Branching ratios that could be tested at the LHC in the coming era of precision Flavor Higgs physics.  [Show abstract] [Hide abstract]
ABSTRACT: The recent discovery of a new boson at the LHC, which resembles a SMlike Higgs boson with m h =125 GeV, is starting to provide strong guidelines into SUSY model building. For instance, the identification of such a state with the lightest CPeven Higgs boson of the MSSM ( h 0), requires large values of tan β and/or heavy sfermions. One outcome of this result is the possibility to solve the SUSY flavor and CP problems by decoupling, which points towards some realization of Splitinspired SUSY scenarios, in which scalars are much heavier than gauginos and higgsinos. However, we argue here that the remaining Higgs bosons of the MSSM ( H 0, A 0, H ±) do not have to be as heavy as the sfermions, and having them with masses near the EW scale does not pose any conflict with current MSSM constraints. We discuss then some SUSY scenarios with heavy sfermions, from a bottomup approach, which contain the full Higgs sector, as well as a possible dark matter candidate, with masses near the EW scale, and identify distinctive signals from these scenarios that could be searched at the LHC.  [Show abstract] [Hide abstract]
ABSTRACT: Models with extra gauge bosons often require an extended Higgs sector, which contains a rich spectrum of Higgs bosons with properties that deviate from the Standard Model (SM). Such Higgs bosons could be searched using standard mechanisms similar to the SM. However, the existence of the new gauge bosons could provide new production mechanisms, which could probe the nonstandard origin of the Higgs particle. In this paper we study how the Z' from a model with extra U(1)' could be used as a source of Higgs bosons. We study 3bodies decays of the Z' into a Higgs boson and a top antitop pair or WW pair, namely Z'\to t\bar{t} h, WW h. We find that it is possible to get {\Br'}s as high as 10^{2} for these modes, which could be studied at future colliders. We also study the production of the Higgs bosons in association with the Z vector boson at a linear collider, through the reaction e^+ e^ \to Z, Z'\to Z+h, including both the resonant and the nonresonant effects.  [Show abstract] [Hide abstract]
ABSTRACT: The ATLAS and CMS collaborations have observed independently a new Higgslike particle with a mass $M_h \sim$ 125 GeV. It is of great interest nowadays to understand the origin and identity of such a particle, whether it comes from the Standard Model (SM) or from some extension of it, such as Supersymmetry (SUSY).The simplest SUSY extension of the SM, the socalled Minimal Supersymmetric Standard Model (MSSM), predicts the treelevel mass relation $M_h\leq M_Z$, so that significant radiative corrections, coming from heavy stop masses and/or large values of $\tan\beta$, are required in order to reach a 125 GeV Higgs boson mass, as well known. Literature already exists within the MSSM also for the case of attempting to explain other ATLAS and CMS results, in particular, an apparent excess in the $gg$induced $\gamma\gamma$ channel, over and above the SM predictions in presence of a Higgs boson. Here, we are interested in evaluating the modifications on these (CPconserving) MSSM results that appear within the CPviolating version of the MSSM. Namely, we will evaluate the role of the complex phases of the soft SUSY terms and the $\mu$ parameter on both the mass of the light Higgs boson, $h_1$, and their effects on the rates for the process $gg \rightarrow h_1 \rightarrow \gamma \gamma$. 
Article: Slim SUSY
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ABSTRACT: The new SMlike Higgs boson discovered recently at the LHC, with mass $m_h \simeq$ 125 GeV, as well as the direct LHC bounds on the mass of superpartners, which are entering into the TeV range, suggest that the minimal surviving supersymmetric extension of the SM (MSSM), should be characterized by a heavy SUSYbreaking scale. Several variants of the MSSM have been proposed to account for this result, which vary according to the accepted degree of finetuning. We propose an alternative scenario here, Slim SUSY, which contains sfermions with multiTeV masses and gauginos/higgsinos near the EW scale, but it includes the heavy MSSM Higgs bosons ($H^0$, $A^0$, $H^\pm$) near the EW scale too. We discuss first the formulation and constraints of the Slim SUSY scenario, and then identify distinctive heavy Higgs signals that could be searched at the LHC, within scenarios with the minimal number of superpartners with masses near the EW scale.  [Show abstract] [Hide abstract]
ABSTRACT: Multi Higgs doublet models are interesting extensions of the Standard Model that can be related to flavor. The reason is that most flavor models usually involve the presence of several additional scalar fields. In this work we present an analysis that shows that for renormalizable flavor models based on the cyclic group of order $N$, if there is one flavored SU(2) double Higgs per generation, the smallest $N$ that can be used to reproduce the NearestNeighborInteraction texture for the quark mass matrices is N=5. Results for the Higgs spectrum and consistency under $K  \bar{K}$ mixing in a specific model with $Z_5$ are also presented.  [Show abstract] [Hide abstract]
ABSTRACT: The rare top decay t> c l+l, which involves flavor violation, is studied as a possible probe of new physics. This decay is analyzed with the simplest Standard Model extensions with additional gauge symmetry formalism. The considered extension is the LeftRight Symmetric Model, including a new neutral gauge boson Z' that allows to obtain the decay at tree level through Flavor Changing Neutral Currents (FCNC) couplings. The neutral gauge boson couplings are considered diagonal but family nonuniversal in order to induce these FCNC. We find the $BR(t> c l+l)~10^{13} for a range 1 TeV < M_{Z'} < 3 TeV.  [Show abstract] [Hide abstract]
ABSTRACT: Dark Matter direct detection experiments are able to exclude interesting parameter space regions of particle models which predict an important amount of thermal relics. We use recent data to constrain the branon model and to compute the region that is favored by CDMS measurements. Within this work, we also update present colliders constraints with new studies coming from the LHC. Despite the present low luminosity, it is remarkable that for heavy branons, CMS and ATLAS measurements are already more constraining than previous analyses performed with TEVATRON and LEP data.  [Show abstract] [Hide abstract]
ABSTRACT: The minimal Higgs sectors of Supersymmetric Grand Unified Theories (SGUT's) can be extended by introducing higher dimensional (anomaly free) representations. We have found models with different anomaly free combinations of SU(5) representations which are different in terms or their &pbeta; functions. It is also interesting to consider the RGE effect associated with the Yukawa coupling that involve the additional Higgs representations. In order to do this we shall consider the 2loop &pbeta; functions for the gauge coupling, but will keep only the 1loop RGE for the new Yukawa couplings, in a SU(5) SGUT model. 
Article: Dark VectorGaugeBoson Model
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ABSTRACT: A model based on $SU(3{)}_{C}\ifmmode\times\else\texttimes\fi{}SU(2{)}_{L}\ifmmode\times\else\texttimes\fi{}U(1{)}_{Y}\ifmmode\times\else\texttimes\fi{}SU(2{)}_{N}$ has recently been proposed, where the $SU(2{)}_{N}$ vector gauge bosons are neutral, so that a vector darkmatter candidate is possible and constrained by data to be less than about 1 TeV. We explore further implications of this model, including a detailed study of its Higgs sector. We improve on its darkmatter phenomenology, as well as its discovery reach at the Large Hadron Collider.  [Show abstract] [Hide abstract]
ABSTRACT: A scenario is presented where the $s$, $c$, and $b$ quark fusion Higgs production cross sections are enhanced with respect to those of the Standard Model. In particular the $c$ quark fusion production is very important and can account for a significant contribution at the Large Hadron Collider. The light Higgs couplings to vector bosons are sufficiently suppressed to allow its mass to lie below the LEP bound of 115 GeV and due to enhanced couplings to second family fermions, the Higgs decay to $\mu$ pairs is large enough to be detectable. This is accomplished with a model incorporating three Higgs doublets charged under a flavor symmetry. 
Article: Neutral SU(2) gauge extension of the standard model and a vectorboson darkmatter candidate
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ABSTRACT: If the standard model of particle interactions is extended to include a neutral SUN(2) gauge factor, with SUC(3)×SUL(2)×UY(1)×SUN(2) embedded in E6 or 3[SU(3)], a conserved generalized R parity may appear. As a result, apart from the recent postulate of a separate nonAbelian gauge factor in the hidden sector, we have the first example of a possible darkmatter candidate X1 which is a nonAbelian vector boson coming from a known unified model. Using current data, its mass is predicted to be less than about 1 TeV. The associated Z′ of this model, as well as some signatures of the Higgs sector, should then be observable at the LHC (Large Hadron Collider).  [Show abstract] [Hide abstract]
ABSTRACT: We discuss the most general formulation of the TwoHiggs doublet model, which incorporates flavor changing neutral scalar interactions (FCNSI) and CP violation (CPV) from several sources. CP violation can arise either from Yukawa terms or from the Higgs potential, be it explicit or spontaneous. We show how the model, which is denoted as 2HDMX, reduces to some versions known in the literature (2HDMI,II,III), as well as some of their variants (top, lepton, dark) denoted here as 2HDMIV. We also discuss another limit that includes CPV and Yukawa four textures to control FCNSI, which we denote as 2HDMV. We evaluate the CPV asymmetry for the decay $h\to bcW$, which may allow to test the patterns of FCNSI and CPV, that arises in these models.  [Show abstract] [Hide abstract]
ABSTRACT: Supersymmetric Grand Unified Theories (SGUTs) have achieved some degree of success, already present in the minimal models (with SU(5) or SO(10)). However, there are open problems that suggest the need to incorporate more elaborate constructions, specifically the use of higherdimensional representations in the Higgs sector. For example, a $45$ representation of SU(5) is often included to obtain correct mass relations for the first and second families of dtype quarks and leptons. When one adds these higherdimensional Higgs representations one must verify the cancellation of anomalies associated to their fermionic partners. One possible choice, free of anomalies, include both $45,\overline{45}$ representations to cancel anomalies. We review the necessary conditions for the cancellation of anomalies and discuss the different possibilities for supersymmetric SU(5) models. Alternative anomalyfree combinations of Higgs representations, beyond the usual vectorlike choice, are identified, and it is shown that their corresponding $\beta$ functions are not equivalent. Although the unification of gauge couplings is not affected, the introduction of multidimensional representations leads to different scenarios for the perturbative validity of the theory up to the Planck scale. We study the effect on the evolution of the gauge coupling up to the Planck scale due to the different sets of fields and representations that can render an anomalyfree model.  [Show abstract] [Hide abstract]
ABSTRACT: We explore in detail the Higgs phenomenology that results in a model where righthanded neutrinos have a mass scale of the order of the electroweak scale. In this model all scales arise from spontaneous symmetry breaking, and this is achieved with a Higgs sector that includes an extra Higgs singlet in addition to the standard model Higgs doublet. The scalar spectrum includes two neutral CPeven states ($h$ and $H$ with $m_{h} < m_{H}$)and a neutral CPodd state ($\sigma$) that can be identified as a pseudoMajoron. The parameter of the Higgs potential are constrained using a perturbativity criteria. Higgs BR and crosssections are discussed, with special emphasis on the detection at the LHC.  [Show abstract] [Hide abstract]
ABSTRACT: In the recently proposed dark leftright gauge model of particle interactions, the lefthanded fermion doublet $(\nu,e)_L$ is connected to its righthanded counterpart $(n,e)_R$ through a scalar bidoublet, but $\nu_L$ couples to $n_R$ only through $\phi_1^0$ which has no vacuum expectation value. The usual R parity, i.e. $R = ()^{3B+L+2j}$, can be defined for this nonsupersymmetric model so that both $n$ and $\Phi_1$ are odd together with $W_R^\pm$. The lightest $n$ is thus a viable darkmatter candidate (scotino). Here we explore the phenomenology associated with the $SU(2)_R$ gauge group of this model, which allows it to appear at the TeV energy scale. The exciting possibility of $Z' \to 8$ charged leptons is discussed. Comment: 12 pages, 2 figures
Publication Stats
1k  Citations  
273.27  Total Impact Points  
Top Journals
Institutions

19972014

Meritorious Autonomous University of Puebla
 Facultad de Ciencias Físico Matemáticas
Ejido Puebla, Baja California, Mexico


20072010

Universidad de Colima
 Faculty of Science
Colima, Colima, Mexico


20002001

Lawrence Berkeley National Laboratory
Berkeley, California, United States


19921993

Autonomous University of Barcelona
Cerdanyola del Vallès, Catalonia, Spain
