Wed·Apr 13, 2016Wednesday·April 13, 2016

1. 01*

   Exploring the Inert Doublet Model through the dijet plus missing transverse energy channel at the LHC

   P. Poulose🇮🇳 · Shibananda Sahoo🇮🇳 · K. Sridhar🇮🇳

   In this study of the Inert Doublet Model (IDM), we propose that the dijet + missing transverse energy channel at the Large Hadron Collider (LHC) will be an effective way of searching for the scalar particles of the IDM. This channel receives contributions from gauge boson fusion, and $t-$channel production, along with contributions from $H^{+}$ associated production. We perform the analysis including study of the Standard Model (SM) background with assumed systematic uncertainty, and optimise the selection criteria employing suitable cuts on the kinematic variables to maximise the signal significance. We find that with high luminosity option of the LHC, this channel has the potential to probe the IDM in the mass range of up to about 400 GeV, which is not accessible through other leptonic channels. In a scenario with light dark matter of mass about 65 GeV, charged Higgs in the mass range of around 200 GeV provides the best possibility with a signal significance of about $2\sigma$ at an integrated luminosity of about 3000 fb${}^{-1}$.

   hep-phPLB(2017)·75 citations
2. 02*

   Non-abelian gauge extensions for B-decay anomalies

   Sofiane M. Boucenna🇮🇹 · Alejandro Celis🇩🇪 · Javier Fuentes-Martin🇪🇸 · Avelino Vicente🇪🇸 · Javier Virto🇩🇪

   We study the generic features of minimal gauge extensions of the Standard Model in view of recent hints of lepton-flavor non-universality in semi-leptonic $b\to s{\ell }^{+}{\ell }^{-}$ and $b\to c\ell \nu$ decays. We classify the possible models according to the symmetry-breaking pattern and the source of flavor non-universality. We find that in viable models the ${\mathrm{SU}(2)}_L$ factor is embedded non-trivially in the extended gauge group, and that gauge couplings should be universal, hinting to the presence of new degrees of freedom sourcing non-universality. Finally, we provide an explicit model that can explain the $B$-decay anomalies in a coherent way and confront it with the relevant phenomenological constraints.

   hep-phhep-exPLB(2016)·200 citations
3. 03*

   The Gauge-Higgs Legacy of the LHC Run I

   Anja Butter🇩🇪 · Oscar J. P. Éboli🇧🇷 · J. Gonzalez-Fraile🇩🇪 · M. C. Gonzalez-Garcia🇪🇸 · Tilman Plehn🇩🇪 · Michael Rauch🇩🇪

   The effective Lagrangian expansion provides a framework to study effects of new physics at the electroweak scale. To make full use of LHC data in constraining higher-dimensional operators we need to include both the Higgs and the electroweak gauge sector in our study. We first present an analysis of the relevant di-boson production LHC results to update constraints on triple gauge boson couplings. Our bounds are several times stronger than those obtained from LEP data. Next, we show how in combination with Higgs measurements the triple gauge vertices lead to a significant improvement in the entire set of operators, including operators describing Higgs couplings.

   hep-phhep-exJHEP(2016)·180 citations
4. 04*

   Searching for Additional Higgs Bosons via Higgs Cascades

   Christina Gao🇺🇸 · Markus A. Luty🇺🇸 · Michael Mulhearn🇺🇸 · Nicolás A. Neill🇺🇸 · Zhangqier Wang🇺🇸

   The discovery of a 125 GeV Higgs boson at the Large Hadron Collider strongly motivates direct searches for additional Higgs bosons. In a type I two Higgs doublet model there is a large region of parameter space at $\tan \beta >5$ that is currently unconstrained experimentally. We show that the process $gg\to H\to AZ\to ZZh$ can probe this region, and can be the discovery mode for an extended Higgs sector at the LHC. We analyze 9 promising decay modes for the $ZZh$ state, and we find that the most sensitive final states are $\ell \ell \ell \ell bb$, $\ell \ell jjbb$, $\ell \ell \nu \nu \gamma \gamma$ and $\ell \ell \ell \ell +$missing energy.

   hep-phPRD(2018)·9 citations
5. 05*

   A planar four-loop form factor and cusp anomalous dimension in QCD

   Johannes M. Henn🇩🇪 · Alexander V. Smirnov🇷🇺 · Vladimir A. Smirnov🇷🇺 · Matthias Steinhauser🇩🇪

   We compute the fermionic contribution to the photon-quark form factor to four-loop order in QCD in the planar limit in analytic form. From the divergent part of the latter the cusp and collinear anomalous dimensions are extracted. Results are also presented for the finite contribution. We briefly describe our method to compute all planar master integrals at four-loop order.

   hep-phhep-thJHEP(2016)·97 citations
6. 06*

   Sensitivity to Majorana neutrinos in $\Delta L=2$ decays of $B_c$ meson at LHCb

   Diego Milanes🇨🇴 · Nestor Quintero🇨🇴 · Carlos E. Vera🇨🇴

   The possible existence of Majorana neutrinos can be tested through the study of processes where the total lepton number $L$ is violated by two units ($\Delta L=2$). In this work, the production of an on-shell Majorana neutrino with a mass around $\sim$ 0.2 GeV to a few GeV is studied in $\Delta L=2$ decays of the $B_c$ meson. We focus on the same-sign di-muon channels: three-body $B_c^{-}\to {\pi }^{+}{\mu }^{-}{\mu }^{-}$ and four-body $B_c^{-}\to J/\psi {\pi }^{+}{\mu }^{-}{\mu }^{-}$ and their experimental sensitivity at the LHCb. In both channels, we find that sensitivities on the branching fraction of the order $\lesssim 10^{-7}(10^{-8})$ might be accessible at the LHC run 2 (future LHC run 3), allowing us to set additional and complementary constraints on the parameter space associated with the mass and mixings of the Majorana neutrino. In particular, bounds can be obtained on the mixing $|V_{\mu N}{|}^2\sim \mathcal{O}(10^{-5}-10^{-4})$ that are similar or better than the ones obtained from heavy meson $\Delta L=2$ decays: $D_{(s)}^{-}\to {\pi }^{+}{\mu }^{-}{\mu }^{-}$ and $B^{-}\to {\pi }^{+}{\mu }^{-}{\mu }^{-}(D^0{\pi }^{+}{\mu }^{-}{\mu }^{-})$.

   hep-phhep-exPRD(2016)·52 citations
7. 07*

   The spin dependent odderon in the diquark model

   Lech Szymanowski🇵🇱 · Jian Zhou🇨🇳

   In this short note, we report a di-quark model calculation for the spin dependent odderon and demonstrate that the asymmetrical color source distribution in the transverse plane of a transversely polarized hadron plays an essential role in yielding the spin dependent odderon. This calculation confirms the earlier finding that the spin dependent odderon is closely related to the parton orbital angular momentum.

   hep-phPLB(2016)·25 citations
8. 08*

   Remark on Structure of Expectation Values of Flavor-Lepton Numbers with respect to Neutrino-Source Hadron States: Deviation from Fermi's Golden Relatio

   Kanji Fujii🇯🇵 · Norihito Toyota🇯🇵

   In our preceeding reports, we have pointed out that a unified description of weak decays accompanying neutrinos and the oscillation process is obtained on the basis of the expectation values of flavor-neutrino numbers with respect to the neutrino-source hadron state. In the present report, we investigate the effect on the expectation values due to the deviation from Fermi's golden relation, and give concrete features of these deviations in the case of ${\pi }^{+}$ and $K^{+}$-decays under the simple situation with the $3$-momentum $\overrightarrow{p_A}=0$ for $A={\pi }^{+}$, $K^{+}$. %numerical results under simple situations.

   hep-ph0 citations
9. 09*

   Lepton flavor violating decay of SM-like Higgs in a radiative neutrino mass model

   T. T. Thuc🇻🇳 · L. T. Hue🇻🇳 · H. N. Long🇻🇳 · T. Phong Nguyen🇻🇳

   The lepton flavor violating decay of the Standard Model-like Higgs (LFVHD) is discussed in the framework of the radiative neutrino mass model built in \cite{Kenji}. The branching ratio (BR) of the LFVHD are shown to reach $10^{-5}$ in the most interesting region of the parameter space shown in \cite{Kenji}. The dominant contributions come from the singly charged Higgs mediations, namely the coupling of $h_2^{\pm }$ with exotic neutrinos. Furthermore, if doubly charged Higgs is heavy enough to allow the mass of $h_2^{\pm }$ around 1 TeV, the mentioned BR can reach $10^{-4}$. Besides, we have obtained that the large values of the Br$(h\to \mu \tau )$ leads to very small ones of the Br$(h\to e\tau )$, much smaller than various sensitivity of current experiments.

   hep-phPRD(2016)·29 citations
10. 10*

    Weak Decays of $J/\psi$ and ${\rm Y}(1S)$

    Tianhong Wang🇨🇳 · Yue Jiang🇨🇳 · Han Yuan🇨🇳 · Kan Chai🇨🇳 · Guo-Li Wang🇨🇳

    In this paper we study the weak decays of $J/\psi$ and ${\rm Y}(1S)$. Using the Bethe-Salpeter method, we calculate the hadronic transition amplitude and give the form factors. We find that two new form factors $h_1$ and $h_2$, which do not appear in existing literature, have contributions in $1^{-}\to 1^{-}$ decays. They affect the branching ratios of semi-leptonic and non-leptonic decays by the rate of $3\%\sim 6\%$ and $2\%\sim 14\%$, respectively, so their contributions can not be ignored and should be considered. Our results show that, for the semi-leptonic decay modes, the largest branching ratios are of the order of $10^{-10}$ both for $J/\psi$ and ${\rm Y}(1S)$ decays, and the largest branching ratios of non-leptonic decays are of the order of $10^{-9}$ for $J/\psi$ and $10^{-10}$ for ${\rm Y}(1S)$.

    hep-phhep-exJ.Phys.G(2017)·36 citations
11. 11*

    Thoughts on heavy-ion physics in the high luminosity era: the soft sector

    Federico Antinori🇮🇹 · Francesco Becattini🇮🇹 · Peter Braun-Munzinger🇩🇪 · Tatsuya Chujo🇯🇵 · Hideki Hamagaki🇯🇵 · John Harris🇺🇸 · Ulrich Heinz🇺🇸 · Boris Hippolyte🇫🇷 · Tetsufumi Hirano🇯🇵 · Barbara Jacak🇺🇸 · Dmitri Kharzeev🇺🇸 · Constantin Loizides🇺🇸 and 19 other authors

    This document summarizes thoughts on opportunities in the soft-QCD sector from high-energy nuclear collisions at high luminosities.

    hep-phnucl-th11 citations
12. 12*

    Occam's Razor in Lepton Mass Matrices - The Sign of Universe's Baryon Asymmetry -

    Yuya Kaneta🇯🇵 · Yusuke Shimizu🇯🇵 · Morimitsu Tanimoto🇯🇵 · Tsutomu T. Yanagida🇯🇵

    We discuss the neutrino mass matrix based on the Occam's Razor approach in the framework of the seesaw mechanism. We impose four zeros in the Dirac neutrino mass matrix, which give the minimum number of parameters needed for the observed neutrino masses and lepton mixing angles, while the charged lepton mass matrix and the right-handed Majorana neutrino mass matrix are taken to be real diagonal ones. The low-energy neutrino mass matrix has only seven physical parameters. We show successful predictions for the mixing angle ${\theta }_{13}$ and the CP violating phase ${\delta }_{CP}$ with the normal mass hierarchy of neutrinos by using the experimental data on the neutrino mass squared differences, the mixing angles ${\theta }_{12}$ and ${\theta }_{23}$. The most favored region of $\sin {\theta }_{13}$ is around $0.13\sim 0.15$, which is completely consistent with the observed value. The CP violating phase ${\delta }_{CP}$ is favored to be close to $\pm \pi /2$. We also discuss the Majorana phases as well as the effective neutrino mass for the neutrinoless double-beta decay $m_{ee}$, which is around $7\sim 8$ meV. It is extremely remarkable that we can perform a "complete experiment" to determine the low-energy neutrino mass matrix, since we have only seven physical parameters in the neutrino mass matrix. In particular, two CP violating phases in the neutrino mass matrix are directly given by two CP violating phases at high energy. Thus, assuming the leptogenesis we can determine the sign of the cosmic baryon in the universe from the low-energy experiments for the neutrino mass matrix.

    hep-phPTEP(2016)·8 citations
13. 13*

    Axion Inflation with an SU(2) Gauge Field: Detectable Chiral Gravity Waves

    Azadeh Maleknejad🇮🇷

    We study a single field axion inflation model in the presence of an SU(2) gauge field with a small vev. In order to make the analysis as model-independent as possible, we consider an arbitrary potential for the axion that is able to support the slow-roll inflation. The gauge field is coupled to the axion with a Chern-Simons interaction $\frac{\lambda }{f}{F}_{\mu \nu }^a{\tilde{F}}_a^{\mu \nu }$ where $\frac{\lambda }{f}\sim \mathcal{O}(10)$. It has a negligible effect on the background evolution, $\frac{{\rho }_{{}_{\mathrm{YM}}}}{M_{\mathrm{Pl}}^2{H}^2}\lesssim {ϵ}^2$. However, its quantum fluctuations make a significant contribution to the cosmic perturbation. In particular, the gauge field has a spin-2 fluctuation which explicitly breaks the parity between the left- and right-handed polarization states. The chiral tensor modes are linearly coupled to the gravitational waves and lead to a circularly polarized tensor power spectrum comparable to the unpolarized vacuum power spectrum. Moreover, the scalar sector is modified by the linear scalar fluctuations of the gauge field. Since the spin-0 and spin-2 fluctuations of the SU(2) gauge field are independent, the gauge field can, at the same time, generate a detectable chiral gravitational wave signal and have a negligible contribution to the scalar fluctuations, in agreement with the current CMB observations.

    hep-phhep-thJHEP(2016)·149 citations
14. 14*

    Fermion mass matrices, textures and beyond

    Manmohan Gupta🇮🇳 · Priyanka Fakay🇮🇳 · Samandeep Sharma🇮🇳 · Gulsheen Ahuja🇮🇳

    The issue of texture specific fermion mass matrices have been examined briefly from the `bottom-up' perspective. In case no conditions are imposed, the texture ansatze leads to a large number of viable possibilities. However, besides textures, if in case one incorporates the ideas of `natural mass matrices' and uses the facility of Weak Basis Transformations, then one is able to arrive at a minimal finite set of viable mass matrices in the case of quarks.

    hep-phMod.Phys.Lett.A(2015)·8 citations
15. 15*

    General lepton textures and their implications

    Gulsheen Ahuja🇮🇳 · Samandeep Sharma🇮🇳 · Priyanka Fakay🇮🇳 · Manmohan Gupta🇮🇳

    The present work attempts to provide an overview of texture specific lepton mass matrices. In particular, we summarize the findings of some recent analyses carried out within non flavor basis, wherein a parallel texture structure for the lepton and neutrino mass matrices is considered.

    hep-phMod.Phys.Lett.A(2015)·10 citations
16. 16*

    Track 3: Computations in theoretical physics -- techniques and methods

    Gionata Luisoni🇨🇭 · Stanislav Poslavsky🇷🇺 · York Schroder🇨🇱

    Here, we attempt to summarize the activities of Track 3 of the 17th International Workshop on Advanced Computing and Analysis Techniques in Physics Research (ACAT 2016).

    hep-phJ.Phys.Conf.Ser.(2016)·4 citations
17. 17*

    Renormalizable SU(5) Unification

    Pavel Fileviez Perez🇩🇪 · Clara Murgui🇩🇪

    We propose a simple renormalizable grand unified theory based on the $SU(5)$ gauge symmetry where the neutrino masses are generated at the quantum level through the Zee mechanism. In this model the same Higgs needed to correct the mass relation between charged leptons and down-type quarks plays a crucial role to generate neutrino masses. We show that in this model one can satisfy the constrains coming from the unification of gauge couplings and the mechanism for neutrino masses is discussed in detail. The predictions for proton decay are discussed in order to understand the testability at current and future experiments such as Hyper-Kamiokande. This simple theory predicts a light colored octet which could give rise to exotic signatures at the LHC.

    hep-phhep-exhep-thPRD(2016)·53 citations
18. 18*

    Alleviating the $\bar{B}\to D\tau \nu$ and $\bar{B}\to D^{\ast }\tau {\nu }_{\tau }$ puzzle in the MSSM

    D. Boubaa🇬🇧 · S. Khalil🇪🇬 · S. Moretti🇬🇧

    We show that Supersymmetric effects driven by penguin contributions to the $b\to c\tau {\nu }_{\tau }$ transition are able to account simultaneously for a sizeable increase of both branching ratios of $\bar{B}\to D\tau {\bar{\nu }}_{\tau }$ and $\bar{B}\to D^{\ast }\tau {\bar{\nu }}_{\tau }$ with respect to the Standard Model predictions, thereby approaching their experimentally measured values. We emphasise that a light chargino and neutralino, with masses less than 300 GeV, in addition to a large stau/snueutrino mass and a large $\tan \beta$, are essential for enhancing the effect of the lepton penguin $\tau {\nu }_{\tau }{W}^{\pm }$, which is responsible for the improved theoretical predictions with respect to current data.

    hep-phInt.J.Mod.Phys.A(2019)·12 citations
19. 19*

    The interaction region of high energy protons

    I.M. Dremin🇷🇺 · S.N. White🇨🇭

    The spatial view of the interaction region of colliding high energy protons (in terms of impact parameter) is considered. It is shown that the region of inelastic collisions has a very peculiar shape. It saturates for central collisions at an energy of 7 TeV. We speculate on the further evolution with energy, which is contrasted to the "black disk" picture.

    hep-phhep-exnucl-exnucl-th9 citations
20. 20*

    From perturbative calculations of the QCD static potential towards four-loop pole-running heavy quarks masses relation

    A.L. Kataev🇷🇺 · V.S. Molokoedov🇷🇺

    The summary of the available semi-analytical results for the three-loop corrections to the QCD static potential and for the $\mathcal{O}({\alpha }_s^4)$ contributions to the ratio of the running and pole heavy quark masses are presented. The procedure of the determination of the dependence of the four-loop contribution to the pole-running heavy quarks mass ratio on the number of quarks flavours, based on application of the least squares method is described. The necessity of clarifying the reason of discrepancy between the numerical uncertainties of the ${\alpha }_s^4$ coefficients in the mass ratio, obtained by this mathematical method by the direct numerical calculations is emphasised.

    hep-phJ.Phys.Conf.Ser.(2016)·4 citations
21. 21*

    Affleck-Dine Baryogenesis in Type IIB String Models

    Rouzbeh Allahverdi🇺🇸 · Michele Cicoli🇮🇹 · Francesco Muia🇮🇹

    We present a viable string embedding of Affleck-Dine baryogenesis in type IIB sequestered models where the late-time decay of the lightest modulus reheats the universe to relatively low temperatures. We show that if inflation is driven by a blow-up Kaehler modulus, the Affleck-Dine field can become tachyonic during inflation if the Kaehler metric for matter fields has an appropriate inflaton-dependent contribution. We find that the Affleck-Dine mechanism can generate the observed baryon asymmetry for natural values of the underlying parameters which lead also to successful inflation and low-energy gaugino masses in a split supersymmetry scenario. The reheating temperature from the lightest modulus decay is high enough to allow thermal Higgsino-like dark matter.

    ↳ hep-thgr-qchep-phJHEP(2016)·23 citations
22. 22*

    Experimental overview on quarkonium production

    Roberta Arnaldi🇮🇹

    Quarkonium production in heavy-ion collisions is a well-known signature of the formation of a plasma of quarks and gluons (QGP). After thirty years from the first measurements at SPS energies, a large wealth of results is now accessible from high-energy experiments at RHIC and LHC, and these new data are contributing to sharpen the picture of the quarkonium behaviour in A-A collisions. In this paper, an overview of the main results on both charmonium and bottomonium production in p-A and A-A collisions is presented, focussing on the most recent achievements from the RHIC and LHC experiments.

    ↳ hep-exhep-phNPA(2016)·6 citations
23. 23*

    Estimation of the Shear Viscosity from 3FD Simulations of Au+Au Collisions at $\sqrt{s_{NN}}=$ 3.3--39 GeV

    Yu. B. Ivanov🇷🇺 · A. A. Soldatov🇷🇺

    An effective shear viscosity in central Au+Au collisions is estimated in the range of incident energies 3.3 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The simulations are performed within a three-fluid model employing three different equations of state with and without the deconfinement transition. In order to estimate this effective viscosity, we consider the entropy produced in the 3FD simulations as if it is generated within the conventional one-fluid viscous hydrodynamics. It is found that the effective viscosity within different considered scenarios is very similar at the expansion stage of the collision: as a function of temperature ($T$) the viscosity-to-entropy ratio behaves as $\eta /s\sim 1/T^4$; as a function of net-baryon density ($n_B$), $\eta /s\sim 1/s$, i.e. it is mainly determined by the density dependence of the entropy density. The above dependencies take place along the dynamical trajectories of Au+Au collisions. At the final stages of the expansion the $\eta /s$ values are ranged from $\sim$0.05 at highest considered energies to $\sim$0.5 at the lowest ones.

    ↳ nucl-thhep-phEPJA(2016)·13 citations
24. 24*

    Meson cloud effects in nucleon resonances at low and intermediate energies

    Bojan Golli🇸🇮

    We review some results obtained by the Coimbra-Ljubljana collaboration that reveal the important role of the pion cloud in the low- and intermediate-energy nucleon and delta resonances.

    ↳ nucl-thhep-phActa Phys.Polon.Supp.(2015)·0 citations
25. 25*

    Exotic vector charmonium and its leptonic decay width

    Ying Chen🇨🇳 · Wei-Feng Chiu🇨🇳 · Ming Gong🇨🇳 · Long-Cheng Gui🇨🇳 · Zhaofeng Liu🇨🇳

    We propose a novel type of interpolating field operators, which manifests the hybrid-like configuration that the charm quark-antiquark pair recoils against gluonic degrees of freedom. A heavy vector charmonium-like state with a mass of $4.33(2)\mathrm{GeV}$ is disentangled from the conventional charmonium states in the quenched approximation. This state has affinity for the hybrid-like operators but couples less to the relevant quark bilinear operator. We also try to extract its leptonic decay constant and give a tentative upper limit that it is less than one tenth of that of $J/\psi$, which corresponds to a leptonic decay width about dozens of eV. The connection of this state with $X(4260)$ is also discussed.

    ↳ hep-lathep-phnucl-exCPC(2016)·32 citations
26. 26*

    Charge symmetry breaking in the A=4 hypernuclei

    Daniel Gazda🇸🇪 · Avraham Gal🇮🇱

    Charge symmetry breaking (CSB) in the $\Lambda$-nucleon strong interaction generates a charge dependence of $\Lambda$ separation energies in mirror hypernuclei, which in the case of the $A=4$ mirror hypernuclei $0^{+}$ ground states is sizable, $\Delta B_{\Lambda }^{J=0}\equiv B_{\Lambda }^{J=0}{(}_{\Lambda }^4\mathrm{He})-B_{\Lambda }^{J=0}{(}_{\Lambda }^4\mathrm{H})=230\pm 90$ keV, and of opposite sign to that induced by the Coulomb repulsion in light hypernuclei. Recent ab-initio calculations of the (${}_{\Lambda }^4\mathrm{H},{}_{\Lambda }^4\mathrm{He}$) mirror hypernuclei $0_{g.s.}^{+}$ and $1_{\mathrm{exc}}^{+}$ levels have demonstrated that a $\Lambda -{\Sigma }^0$ mixing CSB model due to Dalitz and von Hippel (1964) is capable of reproducing this large value of $\Delta B_{\Lambda }^{J=0}$. These calculations are discussed here with emphasis placed on the leading-order chiral EFT hyperon-nucleon strong-interaction Bonn-Juelich potential model used and the no-core shell-model calculational scheme applied. The role of one-pion exchange in producing sizable CSB level splittings in the $A=4$ mirror hypernuclei is discussed.

    ↳ nucl-thhep-phnucl-exNPA(2016)·40 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.