Fri·Oct 16, 2015Friday·October 16, 2015

1. 01*

   Testing Pomeron flavour symmetry with diffractive W charge asymmetry

   Annabelle Chuinard🇨🇦 · Christophe Royon🇺🇸 · Rafal Staszewski🇵🇱

   This study focuses on hard diffractive events produced in proton-proton collision at LHC exhibiting one intact proton in the final state which can be tagged by forward detectors. We report prospective results on the W boson charge asymmetry measured for such events, which allow to constrain the quark diffractive density functions in the Pomeron.

   hep-phJHEP(2016)·15 citations
2. 02*

   Global analysis of $b\to s\ell \ell$ anomalies

   Sébastien Descotes-Genon🇫🇷 · Lars Hofer🇪🇸 · Joaquim Matias🇪🇸 · Javier Virto🇩🇪

   We present a detailed discussion of the current theoretical and experimental situation of the anomaly in the angular distribution of $B\to K^{\ast }(\to K\pi ){\mu }^{+}{\mu }^{-}$, observed at LHCb in the $1{\text{fb}}^{-1}$ dataset and recently confirmed by the $3{\text{fb}}^{-1}$ dataset. The impact of this data and other recent measurements on $b\to s{\ell }^{+}{\ell }^{-}$ transitions ($\ell =e,\mu$) is considered. We review the observables of interest, focusing on their theoretical uncertainties and their sensitivity to New Physics, based on an analysis employing the QCD factorisation approach including several sources of hadronic uncertainties (form factors, power corrections, charm-loop effects). We perform fits to New Physics contributions including experimental and theoretical correlations. The solution that we proposed in 2013 to solve the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ anomaly, with a contribution ${\mathcal{C}}_9^{\mathrm{NP}}\simeq -1$, is confirmed and reinforced. A wider range of New-Physics scenarios with high significances (between 4 and 5 $\sigma$) emerges from the fit, some of them being particularly relevant for model building. More data is needed to discriminate among them conclusively. The inclusion of $b\to s{e}^{+}{e}^{-}$ observables increases the significance of the favoured scenarios under the hypothesis of New Physics breaking lepton flavour universality. Several tests illustrate the robustness of our conclusions.

   hep-phJHEP(2016)·511 citations
3. 03*

   Unbiased polarized PDFs upgraded with new inclusive DIS data

   Emanuele R. Nocera🇬🇧

   I present a determination of longitudinally-polarized parton distribution functions of the proton from inclusive deep-inelastic scattering data: NNPDFpol1.0+. This determination, based on the NNPDF methodology, upgrades a previous analysis, NNPDFpol1.0, in two respects: first, it includes all new data sets which have recently become available from the COMPASS experiment at CERN and from the E93-009, EG1-DVCS and E06-014 experiments at JLAB; second, it uses the state-of-the-art unpolarized parton set NNPDF3.0 as a baseline for the reconstruction of fitted observables and for the determination of positivity constraints. I discuss the impact of both these new inputs on the uncertainty of parton distribution functions.

   hep-phJ.Phys.Conf.Ser.(2016)·6 citations
4. 04*

   Large muon $(g-2)$ from TeV-scale MSSM with infinite $\tan \beta$

   Markus Bach🇩🇪 · Jae-hyeon Park🇪🇸 · Dominik Stöckinger🇩🇪 · Hyejung Stöckinger-Kim🇩🇪

   The muon anomalous magnetic moment $a_{\mu }$ is studied in the infinite $\tan \beta$ limit of the MSSM. Since the muon mass arises completely from loop effects, large corrections to $a_{\mu }$ are expected in comparison to the usual case with moderately high $\tan \beta$. Due to the qualitatively different parameter dependence, the gap between the experimental value and the Standard Model prediction can be filled only in parameter volumes in which a mass hierarchy suppresses the chargino loop in favour of the neutralino contribution. Two such possibilities are found to have either large Higgsino mass or large muon sneutrino mass. Supersymmetric particles even at the TeV scale can lead to the best fit of $a_{\mu }$.

   hep-phPoS(2015)·1 citation
5. 05*

   Limits on Neutrinophilic Two-Higgs-Doublet Models from Flavor Physics

   Enrico Bertuzzo🇧🇷 · Yuber F. Perez G.🇧🇷 · Olcyr Sumensari🇫🇷 · Renata Zukanovich Funchal🇧🇷

   We derive stringent limits on neutrinophilic two-Higgs-doublet models from low-energy observables after the discovery of the Higgs boson and of the mixing angle ${\theta }_{13}$. These decays can constrain the plane spanned by $m_{H^{\pm }}$, the mass of the new charged Higgs, and $v_2$, the vacuum expectation value of the new neutrinophilic scalar doublet. Lepton flavor conserving decays are not able to set meaningful bounds, since they depend strongly on the unknown neutrino absolute mass scale. On the other hand, loop induced lepton flavor violating decays, such as $\mu \to e\gamma$, $\mu \to 3e$ or $\mu \to e$ in nuclei are currently responsable for the best limits today. If $v_2\lesssim 1(0.1)$ eV we get $m_{H^{\pm }}\gtrsim 250(2500)$ GeV at 90% CL. In the foreseen future these limits can improve by at least a factor of 100.

   hep-phJHEP(2016)·40 citations
6. 06*

   Bringing Isolated Dark Matter Out of Isolation: Late-time Reheating and Indirect Detection

   Adrienne L. Erickcek🇺🇸 · Kuver Sinha🇺🇸 · Scott Watson🇺🇸

   In standard cosmology, the growth of structure becomes significant following matter-radiation equality. In non-thermal histories, where an effectively matter-dominated phase occurs due to scalar oscillations prior to Big Bang Nucleosynthesis, a new scale at smaller wavelengths appears in the matter power spectrum. Density perturbations that enter the horizon during the matter-dominated phase grow linearly with the scale factor prior to the onset of radiation domination, which leads to enhanced inhomogeneity on small scales if dark matter thermally and kinetically decouples during the matter-dominated phase. The microhalos that form from these enhanced perturbations significantly boost the self-annihilation rate for dark matter. This has important implications for indirect detection experiments: the larger annihilation rate will result in observable signals from dark matter candidates that are usually deemed untestable. As a proof of principle, we consider Binos in heavy supersymmetry with an intermediate extended Higgs sector and all other superpartners decoupled. We find that these isolated Binos, which lie under the neutrino floor, can account for the dark matter relic density while also leading to observable predictions for Fermi-LAT. Current limits on the annihilation cross section from Fermi-LAT's observations of dwarf spheroidal galaxies may already constrain Bino dark matter up to masses $\mathcal{O}(300)$ GeV, depending on the internal structure of the microhalos. More extensive constraints are possible with improved gamma-ray bounds and boost calculations from $N$-body simulations.

   hep-phastro-ph.COhep-thPRD(2016)·57 citations
7. 07*

   A Review of WIMP Baryogenesis Mechanisms

   Yanou Cui🇺🇸

   It was recently proposed that weakly interacting massive particles (WIMP) may provide new ways of generating the observed baryon asymmetry in the early universe, as well as addressing the cosmic coincidence between dark matter and baryon abundances. This suggests a new possible connection between weak scale new particle physics and modern cosmology. This review summarizes the general ideas and simple model examples of the two recently proposed WIMP baryogenesis mechanisms: baryogenesis from WIMP dark matter annihilation during thermal freezeout, and baryogenesis from metastable WIMP decay after thermal freezeout. This letter also discusses the interesting phenomenology of these models, in particular the experimental signals that can be probed in the intensity frontier experiments and the Large Hadron Collider (LHC) experiments.

   hep-phastro-ph.COhep-exhep-thMod.Phys.Lett.A(2015)·37 citations
8. 08*

   Quarkonium Hybrids with Nonrelativistic Effective Field Theories

   Matthias Berwein🇩🇪 · Nora Brambilla🇩🇪 · Jaume Tarrus Castella🇩🇪 · Antonio Vairo🇩🇪

   We construct a nonrelativistic effective field theory description of heavy quarkonium hybrids from QCD. We identify the symmetries of the system made of a heavy quark, a heavy antiquark, and glue in the static limit. Corrections to this limit can be obtained order by order in an expansion in the inverse of the mass $m$ of the heavy quark. At order $1/m$ in the expansion, we obtain at the level of potential Non-Relativistic QCD a system of coupled Schrödinger equations that describes hybrid spin-symmetry multiplets, including the mixing of different static energies into the hybrid states, an effect known as $\Lambda$-doubling in molecular physics. In the short distance, the static potentials depend on two nonperturbative parameters, the gluelump mass and the quadratic slope, which can be determined from lattice calculations. We adopt a renormalon subtraction scheme for the calculation of the perturbative part of the potential. We numerically solve the coupled Schrödinger equations and obtain the masses for the lowest lying spin-symmetry multiplets for $c\bar{c}$, $b\bar{c}$, and $b\bar{b}$ hybrids. The $\Lambda$-doubling effect breaks the degeneracy between opposite parity spin-symmetry multiplets and lowers the mass of the multiplets that get mixed contributions of different static energies. We compare our findings to the experimental data, direct lattice computations, sum rules calculations, and discuss the relation to the Born-Oppenheimer approximation.

   hep-phhep-latPRD(2015)·159 citations
9. 09*

   Conformal Complex Singlet Extension of the Standard Model: Scenario for Dark Matter and a Second Higgs Boson

   Zhi-Wei Wang🇨🇦 · T.G. Steele🇨🇦 · T. Hanif🇧🇩 · R.B. Mann🇨🇦

   We consider a conformal complex singlet extension of the Standard Model with a Higgs portal interaction. The global $U(1)$ symmetry of the complex singlet can be either broken or unbroken and we study each scenario. In the unbroken case, the global $U(1)$ symmetry protects the complex singlet from decaying, leading to an ideal cold dark matter candidate with approximately 100 GeV mass along with a significant proportion of thermal relic dark matter abundance. In the broken case, we have developed a renormalization-scale optimization technique to significantly narrow the parameter space and in some situations, provide unique predictions for all the model's couplings and masses. We have found there exists a second Higgs boson with a mass of approximately $550\mathrm{GeV}$ that mixes with the known $125\mathrm{GeV}$ Higgs with a large mixing angle $\sin \theta \approx 0.47$ consistent with current experimental limits. The imaginary part of the complex singlet in the broken case could provide axion dark matter for a wide range of models. Upon including interactions of the complex scalar with an additional vector-like fermion, we explore the possibility of a diphoton excess in both the unbroken and the broken cases. In the unbroken case, the model can provide a natural explanation for diphoton excess if extra terms are introduced providing extra contributions to the singlet mass. In the broken case, we find a set of coupling solutions that yield a second Higgs boson of mass $720\mathrm{GeV}$ and an $830\mathrm{GeV}$ extra vector-like fermion $F$, which is able to address the $750\mathrm{GeV}$ LHC diphoton excess. We also provide criteria to determine the symmetry breaking pattern in both the Higgs and hidden sectors.

   hep-phJHEP(2016)·41 citations
10. 10*

    Disambiguating Seesaw Models using Invariant Mass Variables at Hadron Colliders

    P. S. Bhupal Dev🇬🇧 · Doojin Kim🇺🇸 · Rabindra N. Mohapatra🇺🇸

    We propose ways to distinguish between different mechanisms behind the collider signals of TeV-scale seesaw models for neutrino masses using kinematic endpoints of invariant mass variables. We particularly focus on two classes of such models widely discussed in literature: (i) Standard Model extended by the addition of singlet neutrinos and (ii) Left-Right Symmetric Models. Relevant scenarios involving the same "smoking-gun" collider signature of dilepton plus dijet with no missing transverse energy differ from one another by their event topology, resulting in distinctive relationships among the kinematic endpoints to be used for discerning them at hadron colliders. These kinematic endpoints are readily translated to the mass parameters of the on-shell particles through simple analytic expressions which can be used for measuring the masses of the new particles. A Monte Carlo simulation with detector effects is conducted to test the viability of the proposed strategy in a realistic environment. Finally, we discuss the future prospects of testing these scenarios at the $\sqrt{s}=14$ and 100 TeV hadron colliders.

    hep-phhep-exJHEP(2016)·71 citations
11. 11*

    Curing the acausal behavior of the sound velocity in an excluded volume hadron resonance gas model

    Guru Prakash Kadam🇮🇳

    We improve the excluded volume hadron resonances gas model (EHRG) to cure the acausal behavior of the sound velocity which is typical of excluded volume models. We achieve this by including temperature (T) and density ({\mu}) dependent hadron masses in the partition function of EHRG. The temperature and density dependent masses of the constituent quarks (u,d,s) and the light mesons are obtained within Nambu-Jona-Lasinio model while for the heavy hadrons we use linear scaling rule in terms of constituent quarks. With this improvement, we observe that the velocity of sound flattens at high temperature unlike old EHRG models where the sound velocity rises very rapidly at high temperatures which is the indication of its super-luminal behavior.

    hep-ph7 citations
12. 12*

    Determination of $|V_{ub}|$ from exclusive baryonic $B$ decays

    Y.K. Hsiao🇨🇳 · C.Q. Geng🇨🇳

    We use the exclusive baryonic $B$ decays to determine the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{ub}$. From the relation $|V_{ub}{|}^2/|V_{cb}{|}^2=({\mathcal{B}}_{\pi }/{\mathcal{B}}_D){\mathcal{R}}_{ff}$ based on $B^{-}\to p\bar{p}{\pi }^{-}$ and ${\bar{B}}^0\to p\bar{p}{D}^0$ decays, where $|V_{cb}|$ and ${\mathcal{B}}_{\pi }/{\mathcal{B}}_D\equiv \mathcal{B}(B^{-}\to p\bar{p}{\pi }^{-})/\mathcal{B}({\bar{B}}^0\to p\bar{p}{D}^0)$ are the data input parameters, while ${\mathcal{R}}_{ff}$ is the one fixed by the $B\to p\bar{p}$ transition matrix elements, we find $|V_{ub}|=(3.48_{-0.63}^{+0.87}\pm 0.40\pm 0.07)\times 10^{-3}$ with the errors corresponding to the uncertainties from ${\mathcal{R}}_{ff}$, ${\mathcal{B}}_{\pi }/{\mathcal{B}}_D$ and $|V_{cb}|$, respectively. Being independent of the previous results, our determination of $|V_{ub}|$ has the central value close to those from the exclusive $\bar{B}\to \pi \ell {\bar{\nu }}_{\ell }$ and ${\Lambda }_b\to p{\mu }^{-}{\bar{\nu }}_{\mu }$ decays, but overlaps the one from the inclusive $\bar{B}\to X_u\ell {\bar{\nu }}_{\ell }$ with the current uncertainties. The extraction of $|V_{ub}|$ in the baryonic $B$ decays is clearly very useful for the complete determination of the CKM matrix elements as well as the exploration of new physics.

    hep-phhep-exPLB(2016)·6 citations
13. 13*

    Combined chiral and diquark fluctuations along QCD critical line and enhanced baryon production with parity doubling

    Zhao Zhang🇨🇳 · Teiji Kunihiro🇯🇵

    We argue that there should exist the large combined fluctuations of chiral and diquark condensates along the phase boundary of QCD at moderately high density and relatively low temperature. Such fluctuations might lead to anomalous production of nucleons and its parity partner, which we propose to detect at NICA.

    hep-phEPJA(2016)·3 citations
14. 14*

    Primordial monopoles, proton decay, gravity waves and GUT inflation

    Vedat Nefer Şenoğuz🇹🇷 · Qaisar Shafi🇺🇸

    We consider non-supersymmetric GUT inflation models in which intermediate mass monopoles may survive inflation because of the restricted number of e-foldings experienced by the accompanying symmetry breaking. Thus, an observable flux of primordial magnetic monopoles, comparable to or a few orders below the Parker limit, may be present in the galaxy. The mass scale associated with the intermediate symmetry breaking is $10^{13}$ GeV for an observable flux level, with the corresponding monopoles an order of magnitude or so heavier. Examples based on $SO(10)$ and $E_6$ yield such intermediate mass monopoles carrying respectively two and three units of Dirac magnetic charge. For GUT inflation driven by a gauge singlet scalar field with a Coleman-Weinberg or Higgs potential, compatibility with the Planck measurement of the scalar spectral index yields a Hubble constant (during horizon exit of cosmological scales) $H\sim 7$--$9\times 10^{13}$ GeV, with the tensor to scalar ratio $r$ predicted to be $\gtrsim 0.02$. Proton lifetime estimates for decays mediated by the superheavy gauge bosons are also provided.

    hep-phastro-ph.COPLB(2016)·35 citations
15. 15*

    Thermalization of a boost-invariant non-Abelian plasma: Holographic approach with boundary sourcing

    Loredana Bellantuono🇮🇹 · Pietro Colangelo🇮🇹 · Fulvia De Fazio🇮🇹 · Floriana Giannuzzi🇮🇹

    In a holographic approach, the evolution of a 4D strongly coupled non-Abelian plasma towards equilibrium can be studied investigating a 5D gravitational dual. The process driving the plasma out-of-equilibrium can be described by boundary sourcing, a deformation of the boundary metric; the analysis of the late-time dynamics allows to understand how the hydrodynamic regime settles in. We apply the method to a boost-invariant case, considering the effects of different quenches, solving the Einstein equations in the bulk and studying the time-dependence of observables such as the effective temperature, the energy density and the pressures. The main outcome is that, if the effective temperature of the system when the quench is switched off is $T_{eff}({\tau }^{\ast })=500$ MeV, thermalization is reached within a time of $\mathcal{O}$(1 fm/c), an important information if the case of the QCD plasma produced in relativistic heavy ion collisions is considered.

    hep-phhep-thnucl-thPoS(2015)·1 citation
16. 16*

    Medium-induced jet evolution: multiple branching and thermalization

    Edmond Iancu🇫🇷 · Bin Wu🇨🇳

    For an energetic jet propagating through a weakly-coupled quark-gluon plasma, we present the physical picture of jet quenching in longitudinal phase-space, as emerging from the interplay between the medium-induced, quasi-democratic, branchings and the elastic collisions responsible for the thermalization of the soft branching products.

    hep-phNucl.Part.Phys.Proc.(2016)·2 citations
17. 17*

    Momentum transfer dependence of gpds

    O.V. Selyugin🇷🇺

    Based on the factorization representation of the General Parton Distributions (GPDs) the momentum transfer dependence was determined by the analysis of the different representations of parton distribution functions (PDFs) and all possible experimental data of the electromagnetic form factors of the proton and neutron. The obtained $t$-dependence of the GPDs is checked by analysis of the different hadronic reactions (including exclusive and elastic hadron scattering) in a wide energy region with minimum free fitting parameters.

    hep-phhep-exJ.Phys.Conf.Ser.(2016)·1 citation
18. 18*

    Toward verification of electroweak baryogenesis by electric dipole moments

    Kaori Fuyuto🇯🇵 · Junji Hisano🇯🇵 · Eibun Senaha🇹🇼

    We study general aspects of the CP-violating effects on the baryon asymmetry of the Universe (BAU) and electric dipole moments (EDMs) in models extended by an extra Higgs doublet and a singlet, together with electroweak-interacting fermions. In particular, the emphasis is on the structure of the CP-violating interactions and dependences of the BAU and EDMs on masses of the relevant particles. In a concrete mode, we investigate a relationship between the BAU and the electron EDM for a typical parameter set. As long as the BAU-related CP violation predominantly exists, the electron EDM has a strong power in probing electroweak baryogenesis. However, once a BAU-unrelated CP violation comes into play, the direct correlation between the BAU and electron EDM can be lost. Even in such a case, we point out that verifiability of the scenario still remains with the help of Higgs physics.

    hep-phPLB(2016)·41 citations
19. 19*

    Higher-order QCD corrections to triple collinear splitting functions

    German F. R. Sborlini🇦🇷 · Daniel de Florian🇦🇷 · German Rodrigo🇪🇸

    We present splitting functions in the triple collinear limit at next-to-leading order in the strong coupling. We performed the computation in the context of massless QCD+QED, and consider first collinear processes which include at least one photon. The IR divergent structure of the multi-partonic splitting functions agrees with the Catani's formula. Consistency checks based on symmetry arguments have been implemented and results for different configurations have been cross-checked. Studying photon-started processes, we obtained very compact results: this allowed us to simplify the expressions for the remaining splitting functions.

    hep-phhep-thPoS(2015)·2 citations
20. 20*

    Renormalization of the energy-momentum tensor on the lattice

    Michele Pepe (INFN, Milan Bicocca)🇮🇹 · Leonardo Giusti (Milan Bicocca U. & INFN, Milan Bicocca)🇮🇹

    We present the calculation of the non-perturbative renormalization constants of the energy-momentum tensor in the SU(3) Yang-Mills theory. That computation is carried out in the framework of shifted boundary conditions, where a thermal quantum field theory is formulated in a moving reference frame. The non-perturbative renormalization factors are then used to measure the Equation of State of the SU(3) Yang-Mills theory. Preliminary numerical results are presented and discussed.

    hep-phPoS(2015)·1 citation
21. 21*

    Direct detection prospects of dark vectors with xenon-based dark matter experiments

    Haipeng An🇺🇸 · Kaixuan Ni🇺🇸 · Maxim Pospelov🇨🇦 · Josef Pradler🇦🇹 · Adam Ritz🇨🇦

    Dark matter experiments primarily search for the scattering of WIMPs on target nuclei of well shielded underground detectors. The results from liquid scintillator experiments furthermore provide precise probes of very light and very weakly coupled particles that may be absorbed by electrons. In these proceedings we summarize previously obtained constraints on long-lived dark matter vector particles $V$ (dark photons) in the $0.01-100$ keV mass range. In addition, we provide a first projected sensitivity reach for the upcoming XENON1T dark matter search to detect dark photons.

    hep-phPoS(2015)·1 citation
22. 22*

    Kinetic approach to a relativistic Bose-Einstein condensate

    Alex Meistrenko🇩🇪 · Hendrik van Hees🇩🇪 · Kai Zhou🇩🇪 · Carsten Greiner🇩🇪

    We apply a Boltzmann approach to the kinetic regime of a relativistic Bose-Einstein condensate of scalar bosons by decomposing the one-particle distribution function in a condensate part and a non-zero momentum part of excited modes, leading to a coupled set of evolution equations which are then solved efficiently with an adaptive higher order Runge-Kutta scheme. We compare our results to the partonic cascade Monte-Carlo simulation BAMPS for a critical but far from equilibrium case of massless bosons. Motivated by the color glass condensate initial conditions in QCD with a strongly overpopulated initial glasma state, we also discuss the time evolution starting from an overpopulated initial distribution function of massive scalar bosons. In this system a self-similar evolution of the particle cascade with a non-relativistic turbulent scaling in the infrared sector is observed as well as a relativistic exponent for the direct energy cascade, confirming a weak wave turbulence in the ultraviolet region.

    hep-phPRE(2016)·7 citations
23. 23*

    Sensitivities of Prospective Future e+e- Colliders to Decoupled New Physics

    John Ellis🇬🇧 · Tevong You🇬🇧

    We explore the indirect sensitivities to decoupled new physics of prospective precision electroweak measurements, triple-gauge-coupling measurements and Higgs physics at future $e^{+}{e}^{-}$ colliders, with emphasis on the ILC250 and FCC-ee. The Standard Model effective field theory (SM EFT) is adopted as a model-independent approach for relating experimental precision projections to the scale of new physics, and we present prospective constraints on the Wilson coefficients of dimension-6 operators. We find that in a marginalised fit ILC250 EWPT measurements may be sensitive to new physics scales $\Lambda =\mathcal{O}(10)$~TeV, and FCC-ee EWPT measurements may be sensitive to $\Lambda =\mathcal{O}(30)$~TeV. The prospective sensitivities of Higgs and TGC measurements at the ILC250 (FCC-ee) are to $\Lambda =\mathcal{O}(1)$~TeV ($\Lambda =\mathcal{O}(2)$~TeV).

    hep-phhep-exJHEP(2016)·77 citations
24. 24*

    Subleading processes in production of $W^{+}{W}^{-}$ pairs in proton-proton collisions

    Antoni Szczurek🇵🇱 · Marta Luszczak🇵🇱

    We discuss new subleading processes for inclusive production of $W^{+}{W}^{-}$ pairs. We focus mainly on photon-photon induced processes. We include elastic-elastic, elastic-inelastic, inelastic-elastic and inelastic-inelastic contributions. The inelastic photon distributions in the proton are calculated in two different ways: naive approach used already in the literature and using photon distributions by solving special evolution equations with the photon being a parton in the proton. The results strongly depend on the approach used. The resolved photon contribution was calculated in addition and found to be small. We also calculate the cross section for single-diffractive production of $W^{+}{W}^{-}$ pairs including pomeron and reggeon exchanges in the Ingelman-Schlein model. Finally we only mention here about double parton contribution which is interesting by itself.

    hep-phPoS(2015)·1 citation
25. 25*

    One-Family Walking Technicolor in Light of LHC Run-II

    Shinya Matsuzaki🇯🇵

    The LHC Higgs can be identified as the technidilaton, a composite scalar, arising as a pseudo Nambu-Goldstone boson for the spontaneous breaking of scale symmetry in walking technicolor. One interesting candidate for the walking technicolor is the QCD with the large number of fermion flavors, involving the one-family model having the eight-fermion flavors. The smallness of the technidilaton mass can be ensured by the generic walking feature, Miransky scaling, and the presence of the "anti-Veneziano limit" characteristic to the large-flavor walking scenario. To tell the standard-model Higgs from the technidilaton, one needs to wait for the precise estimate of the Higgs couplings to the standard model particles, which is expected at the ongoing LHC-Run II. In this talk the technidilaton phenomenology in comparison with the LHC Run-I data is summarized with the special emphasis placed on the presence of the anti-Veneziano limit supporting the lightness of technidilaton. Besides the technidilaton, the walking technicolor predicts the rich particle spectrum such as technipions and technirho mesons, arising as composite particles formed by technifermions. The LHC phenomenology of those technihadrons and the discovery channels are also discussed, which are smoking-guns of the walking technicolor, to be accessible at the LHC-Run II.

    hep-phInt.J.Mod.Phys.A(2017)·4 citations
26. 26*

    On $B\to K^{(\ast )}\bar{\nu }\nu$ decays in and beyond the Standard Model

    Christoph Niehoff🇩🇪

    In this talk an analysis of the rare exclusive $B$ decays $B\to K\nu \bar{\nu }$ and $B\to K^{\ast }\nu \bar{\nu }$ within and beyond the Standard Model is presented. Combining new form factor determinations from lattice QCD with light-cone sum rule results and including complete two-loop electroweak corrections to the SM Wilson coefficient, precise Standard Model predictions will be given. Beyond the SM, we make use of an effective theory with dimension-six operators invariant under the SM gauge symmetries to relate NP effects in $b\to s\bar{\nu }\nu$ transitions to $b\to s{\ell }^{+}{\ell }^{-}$ transitions and use the wealth of experimental data on $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and related modes to constrain NP effects in $B\to K^{(\ast )}\nu \bar{\nu }$. We then consider leptoquark models as a showcase for models where in principle large effects are possible.

    hep-phPoS(2015)·2 citations
27. 27*

    Lepton flavour universality violation from composite muons

    Peter Stangl🇩🇪

    We describe a possibility to explain the $2.6\sigma$ deviation from lepton flavour universality observed by the LHCb collaboration in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays in the context of minimal composite Higgs models. We find that a sizable degree of compositeness of partially composite muons can lead to a good agreement with the experimental data. Our construction predicts a new physics contribution to $B_s$-${\bar{B}}_s$ mixing. Additionally, it accounts for the deficit in the invisible $Z$ width measured at LEP.

    hep-phPoS(2015)·1 citation
28. 28*

    Leptogenesis in natural low-scale seesaw mechanisms

    Michele Lucente🇫🇷

    We explore the hypothesis of having an approximate lepton number conservation as a way to achieve a successful leptogenesis in low-scale seesaw mechanisms. The smallness of the active neutrino masses, as well as a strong degeneracy in the mass spectrum of the heavy sterile states, are both consequence of the assumed approximate symmetry. We propose a minimal extension of the Standard Model in order to implement the idea, and perform an analytical and numerical study to determine the viable solutions in the model and the testability of this leptogenesis scenario in future experiments.

    hep-phastro-ph.COPoS(2015)·0 citations
29. 29*

    Possible pentaquarks with heavy quarks

    Hongxia Huang🇨🇳 · Chengrong Deng🇨🇳 · Jialun Ping🇨🇳 · Fan Wang🇨🇳

    Inspired by the discovery of two pentaquarks $P_c(4380)$ and $P_c(4450)$ at the LHCb detector, we study possible hidden-charm molecular pentaquarks in the framework of quark delocalization color screening model. Our results suggest that both $N{\eta }_c$ with $I{J}^P=\frac{1}{2}{\frac{1}{2}}^{-}$ and $NJ/\psi$ with $I{J}^P=\frac{1}{2}{\frac{3}{2}}^{-}$ are bounded by channels coupling. However, $NJ/\psi$ with $I{J}^P=\frac{1}{2}{\frac{3}{2}}^{-}$ may be a resonance state in the $D-$wave $N{\eta }_c$ scattering process. Moreover, $P_c(4380)$ can be explained as the molecular pentaquark of ${\Sigma }_c^{\ast }D$ with quantum numbers $I{J}^P=\frac{1}{2}{\frac{3}{2}}^{-}$. The state ${\Sigma }_c^{\ast }{D}^{\ast }$ with $I{J}^P=\frac{1}{2}{\frac{5}{2}}^{-}$ is a resonance, it may not be a good candidate of the observed $P_c(4450)$ because of the opposite parity of the state to $P_c(4380)$, although the mass of the state is not far from the experimental value. In addition, the calculation is extended to the hidden-bottom pentaquarks, the similar properties as that of hidden-charm pentaquarks system are obtained.

    hep-phEPJC(2016)·133 citations
30. 30*

    Out-of-equilibrium energy flow and steady state configurations in AdS/CFT

    Eugenio Megias🇩🇪

    We study out-of-equilibrium energy flow in a strongly coupled system by using the AdS/CFT correspondence. In particular, we describe the appearance of a steady state connecting two asymptotic equilibrium systems. We obtain results within the linear response regime.

    ↳ hep-thcond-mat.stat-mechcond-mat.str-elhep-phPoS(2015)·8 citations
31. 31*

    Influence of finite volume and magnetic field effects on the QCD phase diagram

    Niseem Magdy🇺🇸 · M. Csanád🇭🇺 · Roy A. Lacey🇺🇸

    The Polyakov linear sigma model (PLSM) is used to investigate the respective influence of a finite volume and a magnetic field on the quark-hadron phase boundary in the plane of baryon chemical potential (${\mu }_B$) vs. temperature ($T$) of the QCD phase diagram. The calculated results indicate sizable shifts of the quark-hadron phase boundary to lower values of $({\mu }_B\text{and}T)$ for increasing magnetic field strength, and an opposite shift to higher values of $({\mu }_B\text{and}T)$ for decreasing system volume. Such shifts could have important implications for extraction of the thermodynamic properties of the QCD phase diagram from heavy ion data.

    ↳ nucl-thhep-phJ.Phys.G(2017)·33 citations
32. 32*

    Accelerator-based Short-baseline Neutrino Oscillation Experiments

    Sowjanya Gollapinni (for the MicroBooNE Collaboration)🇺🇸

    Over the last two decades, several experiments have reported anomalous results that could be hinting at the exciting possibility of sterile neutrino states in the $e{V}^2$ mass scale. Liquid Argon Time Projection Chambers (LArTPCs) are a particularly promising technology to explore this physics due to their fine-grained tracking and exceptional calorimetric capabilities. The MicroBooNE experiment, a 170 ton LArTPC scheduled to start taking data very soon with Fermilab's Booster Neutrino Beam (BNB), will combine LArTPC development with the main physics goal of understanding the low-energy electromagnetic anomaly seen by the MiniBooNE experiment. Looking towards the future, MicroBooNE will become a part of the \textit{short-baseline neutrino} program which expands the physics capabilities of the BNB in many important ways by adding additional LArTPC detectors to search for light sterile neutrinos and bring a definitive resolution to the set of existing experimental anomalies. This paper will give an overview of the accelerator-based short-baseline neutrino oscillation program with a focus on the MicroBooNE experiment while highlighting the prospects for further addressing the short-baseline anomalies in the near future.

    ↳ hep-exhep-phphysics.ins-det14 citations
33. 33*

    Measuremements of the top-quark mass and polarization at the Tevatron

    Boris Tuchming🇫🇷

    We present the most recent and sensitive measurements of the top quark mass, performed by the Tevatron experiments, D0 and CDF, using ppbar collision data at sqrt(s) = 1.96 TeV. We also present the first measurement of the top quark polarization at Tevatron, obtained by the D0 Collaboration in the dilepton channels.

    ↳ hep-exhep-phPoS(2015)·1 citation
34. 34*

    Precision physics with heavy-flavoured hadrons

    Patrick Koppenburg🇳🇱 · Vincenzo Vagnoni🇮🇹

    The understanding of flavour dynamics is one of the key aims of elementary particle physics. The last 15 years have witnessed the triumph of the Kobayashi-Maskawa mechanism, which describes all flavour changing transitions of quarks in the Standard Model. This important milestone has been reached owing to a series of experiments, in particular to those operating at the so-called $B$ factories, at the Tevatron, and now at the LHC. We briefly review status and perspectives of flavour physics, highlighting the results where the LHC has given the most significant contributions, notably including the recent observation of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ decay

    ↳ hep-exhep-phAdv.Ser.Direct.High Energy Phys.(2015)·6 citations
35. 35*

    Pion Photo- and Electroproduction and the Chiral MAID Interface

    M. Hilt🇩🇪 · B. C. Lehnhart🇩🇪 · S. Scherer🇩🇪 · L. Tiator🇩🇪

    We discuss the extended on-mass-shell scheme for manifestly Lorentz-invariant baryon chiral perturbation theory. We present a calculation of pion photo- and electroproduction up to and including order $q^4$. The low-energy constants have been fixed by fitting experimental data in all available reaction channels. Our results can be accessed via a web interface, the so-called chiral MAID (http://www.kph.uni-mainz.de/MAID/chiralmaid/).

    ↳ nucl-thhep-phnucl-exJPS Conf.Proc.(2016)·1 citation

* 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.