HEP Phenomenology·hep-ph

Mon·Feb 22, 2016Monday·February 22, 2016

15 papers—12 primary·3 cross-listed·reconstructed*

01*
Probing the Higgs Sector of the Minimal Left-Right Symmetric Model at Future Hadron Colliders
P. S. Bhupal Dev🇩🇪 · Rabindra N. Mohapatra🇺🇸 · Yongchao Zhang🇧🇪
If neutrino masses arise from a TeV-scale minimal Left-Right seesaw model, the ensuing extended Higgs sector with neutral, singly and doubly-charged scalars has a plethora of implications for new Higgs boson searches beyond the Standard Model at future hadron colliders, such as the $s = 14$ TeV High-Luminosity Large Hadron Collider (HL-LHC) and the proposed $s = 100$ TeV collider (FCC-hh or SPPC). In this article, we provide a glimpse of this new physics in the Higgs sector. Our discussion focuses on the minimal non-supersymmetric version of the Left-Right model with high-scale parity breaking but TeV-scale $S U (2)_{R}$ -breaking, a property desirable to suppress the type-II seesaw contribution to neutrino masses. We analyze the masses and couplings of the physical Higgs bosons in this model, and discuss their dominant production and decay modes at hadron colliders. We identify the best discovery channels for each of the non-SM Higgs bosons and estimate the expected SM backgrounds in these channels to derive the sensitivity reaches for the new Higgs sector at future hadron colliders under discussion. Following a rather conservative approach, we estimate that the heavy Higgs sector can be effectively probed up to 15 TeV at the $s = 100$ TeV machine. We also discuss how the LR Higgs sector can be distinguished from other extended Higgs sectors.
hep-phhep-exJHEP(2016)·124 citations
02*
Gamma-ray Limits on Neutrino Lines
Farinaldo S. Queiroz🇩🇪 · Carlos E. Yaguna🇩🇪 · Christoph Weniger🇳🇱
MMonochromatic neutrinos from dark matter annihilations ( $χχ \to ν ν ˉ$ ) are always produced in association with a gamma-ray spectrum generated by electroweak bremsstrahlung. Consequently, these neutrino lines can be searched for not only with neutrino detectors but also indirectly with gamma-ray telescopes. Here, we derive limits on the dark matter annihilation cross section into neutrinos based on recent Fermi-LAT and HESS data. We find that, for dark matter masses above 200 GeV, gamma-ray data actually set the most stringent constraints on neutrino lines from dark matter annihilation and, therefore, an upper bound on the dark matter total annihilation cross section. In addition, we point out that gamma-ray telescopes, unlike neutrino detectors, have the potential to distinguish the flavor of the final state neutrino. Our results indicate that we have already entered into a new era where gamma-ray telescopes are more sensitive than neutrino detectors to neutrino lines from dark matter annihilation.
hep-phastro-ph.HEhep-exJCAP(2016)·43 citations
03*
Bounds on the electromagnetic dipole moments through the single top production at the CLIC
M Koksal🇹🇷 · A. A. Billur🇹🇷 · A. Gutierrez-Rodriguez🇲🇽
We obtain bounds on the anomalous magnetic and electric dipole moments of the $t$ -quark from a future high-energy and high-luminosity linear electron positron collider, such as the CLIC, with unpolarized and polarized electron beams which are a powerful tool to determine new physics. We consider the processes $γ e^{-} \to t ˉ b ν_{e}$ ( $γ$ is the Compton backscattering photon) and $e^{+} e^{-} \to e^{-} γ^{*} e^{+} \to t ˉ b ν_{e} e^{+}$ ( $γ^{*}$ is the Weizsacker-Williams photon) which are one of the most important sources of single top quark production. For the systematic uncertainties of $δ_{sy s} = 0%, 5%$ , $b - \mbox t a g g in g e f f i c i e n cy = 0.8$ , center-of-mass energy of $s = 3 T e V$ , integrated luminosity of $L = 2 a b^{- 1}$ and $2 σ (3 σ)$ C.L. the future $e^{+} e^{-}$ collider may put bounds on the electromagnetic dipole moments $a^_{V}$ and $a^_{A}$ of the top quark of the order of $O (1 0^{- 2} - 1 0^{- 1})$ , which are highly competitive with those recently reported in previous studies.
hep-phAdv.High Energy Phys.(2017)·22 citations
04*
Quark number holonomy and confinement-deconfinement transition
Kouji Kashiwa🇯🇵 · Akira Ohnishi🇯🇵
We propose a new quantity which describes the confinement-deconfinement transition based on topological properties of QCD. The quantity which we call the quark number holonomy is defined as the integral of the quark number susceptibility along the closed loop of $θ$ where $θ$ is the dimensionless imaginary chemical potential. Expected behavior of the quark number holonomy at finite temperature is discussed and its asymptotic behaviors are shown.
hep-phhep-lathep-thPRD(2016)·28 citations
05*
Pion production off the nucleon
M. Rafi Alam🇮🇳 · M. Sajjad Athar🇮🇳 · Shikha Chauhan🇮🇳 · S. K. Singh🇮🇳
We have studied charged current neutrino/antineutrino induced weak pion production from nucleon. For the present study, contributions from $Δ (1232)$ -resonant term, non-resonant background terms as well as contribution from higher resonances viz. $P_{11}$ (1440), $D_{13}$ (1520), $S_{11}$ (1535), $S_{11}$ (1650) and $P_{13}$ (1720) are taken. To write the hadronic current for the non-resonant background terms, a microscopic approach based on SU(2) non-linear sigma model has been used. The vector form factors for the resonances are obtained from the helicity amplitudes provided by MAID. Axial coupling in the case of $Δ (1232)$ resonance is obtained by fitting the ANL and BNL $ν$ -deuteron reanalyzed scattering data. The results of the cross sections are presented and discussed for all the possible channels of single pion production induced by charged current interaction.
hep-phJPS Conf.Proc.(2016)·2 citations
06*
Instanton effects on the heavy-quark static potential
U. Yakhshiev🇰🇷 · Hyun-Chul Kim🇰🇷 · B. Turimov🇰🇷 · M.M. Musakhanov🇺🇿 · Emiko Hiyama🇯🇵
We investigate the instanton effects on the heavy-quark potential,including its spin-dependent part, based on the instanton liquid model. Starting with the central potential derived from the instanton vacuum, we obtain the spin-dependent part of the heavy-quark potential. We discuss the results of the heavy-quark potential from the instanton vacuum. We finally solve the nonrelativistic two-body problem, associating with the heavy-quark potential from the instanton vacuum. The instanton effects on the quarkonia spectra are marginal but are required for quantitative description of the spectra.
hep-phhep-exhep-latCPC(2017)·38 citations
07*
Updated determination of chiral couplings and vacuum condensates from hadronic tau decay data
A. Rodríguez-Sánchez🇪🇸 · M. González-Alonso🇫🇷 · A. Pich🇪🇸
We analyze the lowest spectral moments of the left-right two-point correlation function, using all known short-distance constraints and the recently updated ALEPH V-A spectral function from tau decays. This information is used to determine the low-energy couplings L10 and C87 of chiral perturbation theory and the lowest-dimensional contributions to the Operator Product Expansion of the left-right correlator. A detailed statistical analysis is implemented to assess the theoretical uncertainties, including violations of quark-hadron duality.
hep-phPRD(2016)·48 citations
08*
Monopole-center vortex chains in $S U (2)$ gauge theory
Seyed Mohsen Hosseini Nejad🇮🇷 · Sedigheh Deldar (University of Tehran)🇮🇷
We study the relation between center vortex fluxes and monopole fluxes for $S U (2)$ gauge group in a model. This model is the same as thick center vortex model but we use monopole-antimonopole configurations instead of center vortices in the vacuum. Monopole-antimonopole configurations are line-like similar to center vortices. The group factor and potential for the fundamental representation of these configurations are studied and compared with those of center vortices. As a result, we obtain monopole-vortex chains which appear in lattice Monte Carlo simulations, as well. If these monopole-vortex chains intersect the large Wilson loop in two points, screening is observed for the potential in the fundamental representation at large distances and confinement is observed when one leg of the chain intersects the Wilson loop.
hep-phPTEP(2016)·1 citation
09*
Impact of leptonic $τ$ decays on the distribution of $B \to P μ ν ˉ$ decays
Marzia Bordone🇨🇭 · Gino Isidori🇨🇭 · Danny van Dyk (Zurich U.)🇨🇭
We calculate the fully-differential rate of the decays $B \to P τ (\to μ ν ˉ ν) ν ˉ$ where $P = D, π$ , which is a background to the semimuonic decays $B \to P μ ν ˉ$ . The decays with a $3 ν$ final state can have a sizeable impact on the experimental analyses of the ratios $R_{D}$ and $R_{π}$ , depending on the event selection in the analysis. We outline a strategy which permits the extraction of $R_{P} B (τ \to μ ν ˉ ν)$ from the neutrino-inclusive rate. Our analytic results can also be used to test both existing and upcoming experimental analyses. We further provide Monte Carlo samples of the 5D rate of the neutrino-inclusive decays $B \to P μ X_{ν ˉ}$ .
hep-phEPJC(2016)·27 citations
10*
Vacuum energy in some particular quantum field theories
Renata Jora🇷🇴
We study the properties of a class of quantum field theories endowed with an equal number of anti commuting and commuting field variables, the most common example being the supersymmetric models. Based on the scaling properties of the partition function we find that these theories have the quantum energy momentum tensor associated to dilatations and thus the vacuum energy equal to zero.
hep-phhep-thProc. Romanian Academy A, 18, no. 2, 124-…·0 citations
11*
Enhancing the Higgs associated production with a top quark pair
Marcin Badziak🇵🇱 · Carlos E.M. Wagner🇺🇸
It is pointed out that in a wide class of models reminiscent of type-II Two-Higgs-Doublet Models (2HDM) the signal of the Higgs produced in association with a top-antitop quark pair ( $tt h$ ) and decaying into gauge bosons can be significantly larger than the Standard Model (SM) prediction without violating any experimental constraints. The crucial feature of these models is enhanced (suppressed) Higgs coupling to top (bottom) quarks and existence of light colored particles that give negative contribution to the effective Higgs coupling to gluons resulting in the gluon fusion rates in the gauge boson decay channels close to SM predictions. We demonstrate this mechanism in NMSSM with light stops and show that $tt h$ signal in the $W W$ decay channel can be two times larger than the SM prediction, as suggested by the excesses observed by ATLAS and CMS, provided that the Higgs-singlet superpotential coupling $λ ≳ 0.8$ and the MSSM-like Higgs boson masses are in the range of 160 to 300 GeV.
hep-phhep-exJHEP(2016)·15 citations
12*
Discrete Symmetries CP, T, CPT
J. Bernabeu (Valencia U. and Valencia U., IFIC)🇪🇸
The role of Symmetry Breaking mechanisms to search for New Physics is of highest importance. We discuss the status and prospects of the Discrete Symmetries CP, T, CPT looking for their separate Violation in LHC experiments and meson factories.
hep-phActa Phys.Polon.B(2016)·1 citation
13*
The Birth of $E_{8}$ out of the Spinors of the Icosahedron
Pierre-Philippe Dechant🇬🇧
$E_{8}$ is prominent in mathematics and theoretical physics, and is generally viewed as an exceptional symmetry in an eight-dimensional space very different from the space we inhabit; for instance the Lie group $E_{8}$ features heavily in ten-dimensional superstring theory. Contrary to that point of view, here we show that the $E_{8}$ root system can in fact be constructed from the icosahedron alone and can thus be viewed purely in terms of three-dimensional geometry. The $240$ roots of $E_{8}$ arise in the 8D Clifford algebra of 3D space as a double cover of the $120$ elements of the icosahedral group, generated by the root system $H_{3}$ . As a by-product, by restricting to even products of root vectors (spinors) in the 4D even subalgebra of the Clifford algebra, one can show that each 3D root system induces a root system in 4D, which turn out to also be exactly the exceptional 4D root systems. The spinorial point of view explains their existence as well as their unusual automorphism groups. This spinorial approach thus in fact allows one to construct all exceptional root systems within the geometry of three dimensions, which opens up a novel interpretation of these phenomena in terms of spinorial geometry.
↳ math-phhep-phhep-thmath.MP+1Proc.Roy.Soc.Lond.A(2016)·7 citations
14*
Chiral Primordial Gravitational Waves from Dilaton Induced Delayed Chromo-natural Inflation
Ippei Obata🇯🇵 · Jiro Soda🇯🇵
We study inflation driven by a dilaton and an axion, both of which are coupled to a SU(2) gauge field. We find that the inflation driven by the dilaton occurs in the early stage of inflation during which the gauge field grows due to the gauge kinetic function. When the energy density of magnetic fields catches up with that of electric fields, chromo-natural inflation takes over in the late stage of inflation, which we call delayed chromo-natural inflation. Thus, the delayed chromo-natural inflation driven by the axion and the gauge field is induced by the dilaton. The interesting outcome of the model is generation of chiral primordial gravitational waves on small scales. Since the gauge field is inert in the early stage of inflation, it is viable in contrast to the conventinal chromo-natural inflation. We find the parameter region where chiral gravitational waves are generated in a frequency range higher than nHz, which are potentially detectable in future gravitational wave interferometers and pulsar timing arrays such as DECIGO, eLISA and SKA.
↳ hep-thastro-ph.COgr-qchep-phPRD(2016)·98 citations
15*
Massive Gauge-flation
Carlos M. Nieto (1,2)🇮🇹 · Yeinzon Rodriguez (2,3,4) ((1) Scuola Internazionale Superiore di Studi Avanzati, (2) The Abdus Salam International Centre for Theoretical Physics, (3) Universidad Antonio Narino, (4) Universidad Industrial de Santander)🇨🇴
Gauge-flation model at zeroth order in cosmological perturbation theory offers an interesting scenario for realizing inflation within a particle physics context, allowing us to investigate interesting possible connections between inflation and the subsequent evolution of the Universe. Difficulties, however, arise at the perturbative level, thus motivating a modification of the original model. In order to agree with the latest Planck observations, we modify the model such that the new dynamics can produce a relation between the spectral index $n_{s}$ and the tensor-to-scalar ratio $r$ allowed by the data. By including an identical mass term for each of the fields of the system, we find interesting dynamics leading to slow-roll inflation of the right length. The presence of the mass term has the potential to modify the $n_{s}$ vs. $r$ relation so as to agree with the data. As a first step, we study the model at zeroth order in cosmological perturbation theory, finding the conditions required for slow-roll inflation and the number of e-foldings of inflation. Numerical solutions are used to explore the impact of the mass term. We conclude that the massive version of Gauge-flation offers a viable inflationary model.
↳ gr-qcastro-ph.COhep-phMod.Phys.Lett.A(2016)·34 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.