Tue·Oct 13, 2015Tuesday·October 13, 2015

1. 01*

   Minimal Vector-like leptonic Dark Matter and Signatures at the LHC

   Subhaditya Bhattacharya🇮🇳 · Nirakar Sahoo🇮🇳 · Narendra Sahu🇮🇳

   We propose a minimal vector-like leptonic dark matter (DM) with renormalisable interaction in a beyond the Standard Model (SM) scenario, where the SM is augmented with a vector-like doublet and a singlet leptons. The additional fermions are odd under a discrete $Z_2$ symmetry, while the rest of the SM particles are singlets, and thus providing stability to the DM. In this scenario, we show that, the DM emerges as an admixture of the neutral component of the vector-like doublet and the singlet leptons. The singlet-doublet mixing ($\sin \theta$) plays a crucial role in yielding the correct relic density as well as in obtaining null direct DM search results through an interplay of interactions via $Z$ and Higgs mediation. The mixing is also strongly constrained from the invisible Z and Higgs decay width. We found that the correct relic abundance of DM can be obtained in a large region of parameter space for DM-mass larger than $M_Z/2$ and $\sin \theta \le 0.1$. The details of model phenomenology with collider signatures at the Large hadron Collider (LHC) are discussed. In particular, we show that for $\sin \theta \le 0.01$, the charged companion of the DM can give rise to an observable displaced vertex signature, marking a significant departure from other fermionic DM scenarios, while keeping the relic abundance intact.

   hep-phPRD(2016)·68 citations
2. 02*

   Predictions of covariant chiral perturbation theory for nucleon polarisabilities and polarised Compton scattering

   Vadim Lensky🇩🇪 · Judith A. McGovern🇬🇧 · Vladimir Pascalutsa🇩🇪

   We update the predictions of the SU(2) baryon chiral perturbation theory for the dipole polarisabilities of the proton, $\{{\alpha }_{E1},{\beta }_{M1}{\}}_p=\{11.2(0.7),3.9(0.7)\}\times 10^{-4}$fm${}^3$, and obtain the corresponding predictions for the quadrupole, dispersive, and spin polarisabilities: $\{{\alpha }_{E2},{\beta }_{M2}{\}}_p=\{17.3(3.9),-15.5(3.5)\}\times 10^{-4}$fm${}^5$, $\{{\alpha }_{E1\nu },{\beta }_{M1\nu }{\}}_p=\{-1.3(1.0),7.1(2.5)\}\times 10^{-4}$fm${}^5$, and $\{{\gamma }_{E1E1},{\gamma }_{M1M1},{\gamma }_{E1M2},{\gamma }_{M1E2}{\}}_p=\{-3.3(0.8),2.9(1.5),0.2(0.2),1.1(0.3)\}\times 10^{-4}$fm${}^4$. The results for the scalar polarisabilities are in significant disagreement with semi-empirical analyses based on dispersion relations, however the results for the spin polarisabilities agree remarkably well. Results for proton Compton-scattering multipoles and polarised observables up to the Delta(1232) resonance region are presented too. The asymmetries ${\Sigma }_3$ and ${\Sigma }_{2x}$ reproduce the experimental data from LEGS and MAMI. Results for ${\Sigma }_{2z}$ agree with a recent sum rule evaluation in the forward kinematics. The asymmetry ${\Sigma }_{1z}$ near the pion production threshold shows a large sensitivity to chiral dynamics, but no data is available for this observable. We also provide the predictions for the polarisabilities of the neutron: $\{{\alpha }_{E1},{\beta }_{M1}{\}}_n=\{13.7(3.1),4.6(2.7)\}\times 10^{-4}$fm${}^3$, $\{{\alpha }_{E2},{\beta }_{M2}{\}}_n=\{16.2(3.7),-15.8(3.6)\}\times 10^{-4}$fm${}^5$, $\{{\alpha }_{E1\nu },{\beta }_{M1\nu }{\}}_n=\{0.1(1.0),7.2(2.5)\}\times 10^{-4}$fm${}^5$, and $\{{\gamma }_{E1E1},{\gamma }_{M1M1},{\gamma }_{E1M2},{\gamma }_{M1E2}{\}}_n=\{-4.7(1.1),2.9(1.5),0.2(0.2),1.6(0.4)\}\times 10^{-4}$fm${}^4$. The neutron dynamical polarisabilities and multipoles are examined too. We also discuss subtleties related to matching dynamical and static polarisabilities.

   hep-phnucl-thEPJC(2015)·58 citations
3. 03*

   Standard Model vacuum stability in the presence of gauge invariant nonrenormalizable operators

   Zygmunt Lalak🇵🇱 · Marek Lewicki🇵🇱 · Paweł Olszewski🇵🇱

   Analysis of the Standard Model effective potential can reveal certain properties of the UV completion of SM. We discuss the issue of stability of the SM potential after inclusion of new nonrenormalizable interactions. We present the map of lifetimes resulting from different configurations of the new operators. The key result is proof of gauge independence of our results after inclusion of nonrenormalizable operators. We also discuss the consequences of RGE improvement of the potential.

   hep-phPoS(2015)·3 citations
4. 04*

   Realistic estimate of valence transversity from dihadron production

   Marco Radici🇮🇹

   We have updated our extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. The most recent COMPASS data for proton and deuteron targets, complemented by previous HERMES data on the proton, make it possible to perform a flavor separation of the valence components of the transversity distribution, using di-hadron fragmentation functions taken from the semi-inclusive production of two pion pairs in back-to-back jets in $e^{+}{e}^{-}$ annihilation. The $e^{+}{e}^{-}$ data from BELLE have been reanalyzed to reach a more realistic estimate of the uncertainties on the chiral-odd interference fragmentation function. Our results represent the most accurate estimate of the uncertainties on the valence components of the transversity distribution currently available.

   hep-phhep-exnucl-exnucl-th0 citations
5. 05*

   Timelike Compton scattering off the neutron

   Marie Boër🇫🇷 · Michel Guidal🇫🇷 · Marc Vanderhaeghen🇩🇪

   We study the exclusive photoproduction of an electron-positron pair on a neutron target in the Jefferson Lab energy domain. The reaction consists of two processes: the Bethe-Heitler and the Timelike Compton Scattering. The latter process provides potentially access to the Generalized Parton Distributions (GPDs) of the nucleon. We calculate all the unpolarized, single- and double-spin observables of the reaction and study their sensitivities to GPDs.

   hep-phEPJA(2016)·15 citations
6. 06*

   Perturbative and non-perturbative QCD effects in transverse momentum distributions

   Umberto D'Alesio🇮🇹 · Miguel G. Echevarria🇳🇱 · Stefano Melis🇮🇹 · Ignazio Scimemi🇪🇸

   The recent formulation of the factorization theorem for transverse momentum spectra in terms of well-defined transverse momentum dependent distributions (TMDs), allows for a better understanding of the role of the perturbative and non-perturbative QCD contributions and their interplay. In particular, non-perturbative effects are often included both in the evolution of the TMDs and in the modeling of their scale-independent part. Using the available Drell-Yan and $Z$-production data at low and high energy we show that, for the currently available dilepton invariant mass values, the TMD evolution is driven mainly by its perturbative contribution, while the needed non-perturbative correction is scale independent. We then detail the difference between the scale dependences in the high and low boson transverse momentum regime and discuss the related theoretical errors.

   hep-ph0 citations
7. 07*

   Neutron-Antineutron transitions from exotic instantons: how fast they might be and further implications

   Andrea Addazi🇮🇹

   We discuss implications of open string theory in B-violating low energy physics. In particular, exotic instantons can dynamically generate effective six quarks' operator, leading to a neutron-antineutron transition. Proton is not destabilized and flavor changing neutral currents are under control.

   hep-ph13 citations
8. 08*

   Top reduced cross section behavior at the LHeC kinematic range

   G.R. Boroun🇮🇷

   The linear and non-linear behavior of the top reduced cross section in the LHeC region is considered concerning the boson-gluon fusion (BGF) model at the deep inelastic scattering leptoproduction. We will show that the nonlinear behavior, at this region, for the $t\overline{t}$ production is very small. Also the behavior of the top reduced cross section and the ratio $R^t$ in this processes is considered.

   hep-phCPC(2017)·7 citations
9. 09*

   Lepton polarization and CP-violating effects in $\overline{B}\to {\overline{K}}_0^{\ast }(1430){\ell }^{+}{\ell }^{-}$ Decay in Standard and Two Higgs Doublet Model

   F. Falahati🇮🇷 · S. M. Zebarjad🇮🇷 · S. Naeimipour🇮🇷

   In this paper we analyze the dilepton mass square $q^2$ dependency of single lepton polarization asymmetries and CP violation for $\overline{B}\to {\overline{K}}_0^{\ast }(1430){\ell }^{+}{\ell }^{-},\ell =\mu ,\tau )$ in the 2HDM context. Also, we study the averages of these asymmetries in the domain $4m_{\ell }^2<q^2<(m_B-m_{K_0^{\ast }}{)}^2$. Our study manifests that the investigation of the above-mentioned asymmetries for $\overline{B}\to {\overline{K}}_0^{\ast }(1430){\ell }^{+}{\ell }^{-}$ processes could provide useful information for probing new Higgs bosons in the future B-physics experiments.

   hep-phPRD(2016)·2 citations
10. 10*

    Transport Theory from the Nambu-Jona-Lasinio Lagrangian

    R. Marty🇫🇷 · J. M. Torres-Rincon🇫🇷 · E. Bratkovskaya🇩🇪 · J. Aichelin🇫🇷

    Starting from the (Polyakov-) Nambu-Jona-Lasinio Lagrangian, (P)NJL, we formulate a transport theory which allows for describing the expansion of a quark-antiquark plasma and the subsequent transition to the hadronic world --without adding any new parameter to the standard (P)NJL approach, whose parameters are fixed to vacuum physics. This transport theory can be used to describe ultrarelativistic heavy-ion reaction data as well as to study the (first-order) phase transition during the expansion of the plasma. (P)NJL predicts such a phase transition for finite chemical potentials. In this contribution we give an outline of the necessary steps to obtain such a transport theory and present first results.

    hep-phJ.Phys.Conf.Ser.(2016)·4 citations
11. 11*

    125 GeV Higgs boson mass from 5D gauge-Higgs unification

    Jason Carson🇺🇸 · Nobuchika Okada🇺🇸

    In the context of a simple gauge-Higgs unification (GHU) scenario based on the gauge group SU(3)$\times$U(1)${}^{\prime }$ in a 5-dimensional flat space-time, we investigate a possibility to reproduce the observed Higgs boson mass of around 125 GeV. We introduce bulk fermion multiplets with a bulk mass and a (half) periodic boundary condition. In our analysis, we adopt a low energy effective theoretical approach of the GHU scenario, where the running Higgs quartic coupling is required to vanish at the compactification scale. Under this "gauge-Higgs condition," we investigate the renormalization group evolution of the Higgs quartic coupling and find a relation between the bulk mass and the compactification scale so as to reproduce the 125 GeV Higgs boson mass. Through quantum corrections at the one-loop level, the bulk fermions contribute to the Higgs boson production and decay processes and deviate the Higgs boson signal strengths at the Large Hadron Collider (LHC) experiments from the Standard Model (SM) predictions. Employing the current experimental data which show the the Higgs boson signal strengths for a variety of Higgs decay modes are consistent with the SM predictions, we obtain lower mass bounds on the lightest mode of the bulk fermions.

    hep-phhep-exPTEP(2018)·6 citations
12. 12*

    Transverse Force on Quarks in DIS

    Matthias Burkardt (New Mexico State University)🇺🇸

    Generalized Parton Distributions (GPDs) provide information on the distribution of quarks in impact paarmeter space. For transversely polarized nucleons, these impact parameter distributions are transversely distorted and this deviation from axial symmetry leads on average to a net transverse force from the spectators on the active quark in a DIS experiment. %The strength of that force can be related to twist-3 PDFs. This force when acting along the whole trajectory of the active quark leads to a transverse single-spin asymmetries. For a longitudinally polarized nucleon target, the transverse force implies a torque acting on the quark Orbital Angular Momentum (OAM). The resulting change in OAM as the quark leaves the target equals the difference between the Jaffe-Manohar and Ji OAMs.

    hep-phPoS(2015)·2 citations
13. 13*

    Low-energy signals of strongly-coupled electroweak symmetry-breaking scenarios

    Antonio Pich🇪🇸 · Ignasi Rosell🇪🇸 · Joaquin Santos🇪🇸 · Juan Jose Sanz-Cillero🇪🇸

    The non-observation of new particles at the LHC suggests the existence of a mass gap above the electroweak scale. This situation is adequately described through a general electroweak effective theory with the established fields and Standard Model symmetries. Its couplings contain all information about the unknown short-distance dynamics which is accessible at low energies. We consider a generic strongly-coupled scenario of electroweak symmetry breaking, with heavy states above the gap, and analyze the imprints that its lightest bosonic excitations leave on the effective Lagrangian couplings. Different quantum numbers of the heavy states imply different patterns of low-energy couplings, with characteristic correlations which could be identified in future data samples. The predictions can be sharpened with mild assumptions about the ultraviolet behaviour of the underlying fundamental theory.

    hep-phPRD(2016)·40 citations
14. 14*

    Fractality in momentum space: a signal of criticality in nuclear collisions

    Nikolaos G. Antoniou🇬🇷 · Nikolaos Davis🇬🇷 · Fotios K. Diakonos🇬🇷

    We show that critical systems of finite size develop a fractal structure in momentum space with anomalous dimension given in terms of the isotherm critical exponent delta of the corresponding infinite system. The associated power laws of transverse momentum correlations, in high-energy nuclear collisions, provide us with a signature of a critical point in strongly interacting matter according to the laws of QCD.

    hep-phPRC(2016)·31 citations
15. 15*

    Gauge Mediation in the NMSSM with a Light Singlet: Sparticles within the Reach of LHC Run II

    Ben Allanach🇬🇧 · Marcin Badziak🇵🇱 · Cyril Hugonie🇫🇷 · Robert Ziegler🇫🇷

    Relatively light stops in gauge mediation models are usually made compatible with the Higgs mass of 125 GeV by introducing direct Higgs-messenger couplings. We show that such couplings are not necessary in a simple and predictive model that combines minimal gauge mediation and the next-to-minimal supersymmetric standard model (NMSSM). We show that one can obtain a 125 GeV Standard Model-like Higgs boson with stops as light as 1.1 TeV, thanks to the mixing of the Higgs with a singlet state at $\mathcal{O}(90-100)$ GeV that can explain the LEP excess. In this scenario the singlet-higgs-higgs superfields coupling $\lambda$ is small and $\tan \beta$ large. Sparticle searches at the LHC may come with additional $b-$jets or taus and may involve displaced vertices. The sparticle production cross-section at the 13 TeV LHC can be $\mathcal{O}(10-100)$ fb, leading to great prospects for discovery in the early phase of LHC Run II.

    hep-phPoS(2015)·4 citations
16. 16*

    Time Evolution of Temperature Fluctuation in a Non-Equilibrated System

    Trambak Bhattacharyya🇮🇳 · Prakhar Garg🇮🇳 · Raghunath Sahoo🇮🇳 · Prasant Samantray🇮🇳

    The evolution equation for inhomogeneous and anisotropic temperature fluctuation inside a medium is derived within the ambit of Boltzmann Transport Equation (BTE) for a hot gas of massless particles. Also, specializing to a situation created after heavy-ion collision (HIC), we analyze the Fourier space variation of temperature fluctuation of the medium using its temperature profile. The effect of viscosity on the variation of fluctuations in the latter case is investigated and possible implications for early universe cosmology, and its connection with HICs are also explored.

    hep-phnucl-thEPJA(2016)·28 citations
17. 17*

    ${\bar{B}}^0$, $B^{-}$ and ${\bar{B}}_s^0$ decays into $J/\psi$ and $K\bar{K}$ or $\pi \eta$

    Wei-Hong Liang🇨🇳 · Ju-Jun Xie🇨🇳 · E. Oset🇪🇸

    We study the ${\bar{B}}_s^0\to J/\psi K^{+}{K}^{-}$, ${\bar{B}}^0\to J/\psi K^{+}{K}^{-}$, $B^{-}\to J/\psi K^0{K}^{-}$, ${\bar{B}}^0\to J/\psi {\pi }^0\eta$ and $B^{-}\to J/\psi {\pi }^{-}\eta$ decays and compare their mass distributions with those obtained for the ${\bar{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ and ${\bar{B}}^0\to J/\psi {\pi }^{+}{\pi }^{-}$. The approach followed consist in a factorization of the weak part and the hadronization part into a factor which is common to all the processes. Then what makes the reactions different are some trivial Cabibbo-Kobayashi-Maskawa matrix elements and the weight by which the different pairs of mesons appear in a primary step plus their final state interaction. These elements are part of the theory and thus, up to a global normalization factor, all the invariant mass distributions are predicted with no free parameters. Comparison is made with the limited experimental information available. Further comparison of these results with coming LHCb measurements will be very valuable to make progress in our understanding of the meson-meson interaction and the nature of the low lying scalar meson resonances, $f_0(500),f_0(980)$ and $a_0(980)$.

    hep-phhep-exEPJC(2015)·29 citations
18. 18*

    A new phenomenological Investigation of $KMR$ and $MRW$ $unintegrated$ parton distribution functions

    Majid Modarres🇮🇷 · Hossein Hossenikhani🇮🇷 · Naeimeh Olanj🇮🇷 · Mohammadreza Masouminia🇮🇷

    The longitudinal proton structure function, $F_L(x,Q^2)$, from the $k_t$ factorization formalism by using the unintegrated parton distribution functions (UPDF) which are generated through the KMR and MRW procedures. The LO UPDF of the KMR prescription is extracted, by taking into account the PDF of Martin et al, i.e. MSTW2008-LO and MRST99-NLO and next, the NLO UPDF of the MRW scheme is generated through the set of MSTW2008-NLO PDF as the inputs. The different aspects of $F_L(x,Q^2)$ in the two approaches, as well as its perturbative and non-perturbative parts are calculated. Then the comparison of $F_L(x,Q^2)$ is made with the data given by the ZEUS and H1 collaborations. It is demonstrated that the extracted $F_L(x,Q^2)$ based on the UPDF of two schemes, are consistent to the experimental data, and by a good approximation, they are independent to the input PDF. But the one developed from the KMR prescription, have better agreement to the data with respect to that of MRW. As it has been suggested, by lowering the factorization scale or the Bjorken variable in the related experiments, it may be possible to analyze the present theoretical approaches more accurately.

    hep-phEPJC(2015)·20 citations
19. 19*

    Vacuum Birefringence as a Vacuum Emission Process

    Felix Karbstein🇩🇪

    We argue that the phenomenon of vacuum birefringence in strong inhomogeneous electromagnetic fields can be most efficiently analyzed in terms of a vacuum emission process. In this contribution, we exemplarily stick to the case of vacuum birefringence in a stationary perpendicularly directed, purely magnetic background field extending over a finite spatial extent. Similar field configurations are realized in the BMV and PVLAS experiments. We demonstrate that we can reproduce the conventional constant field result. Our focus is on effects which arise when the probe photons originate in the field free region, are directed towards the magnetic field region, and detected well after the interaction with the magnetic field has taken place, again at zero field.

    hep-phquant-ph17 citations
20. 20*

    GravitinoPack and late decays involving gravitinos

    Helmut Eberl🇦🇹 · Vassilis C. Spanos🇬🇷

    In this talk, we present the package GravitinoPack that calculates decays of unstable supersymmetric particles, involving gravitinos in the final or initial state. If the gravitino is the dark matter particle and therefore stable, the package calculates the decays of the lightest neutralino, and the lighter stau or stop NLSP into the gravitino LSP and one or two Standard Model particles. On the other hand, assuming that the gravitino is unstable, GravitinoPack calculates all its two-body and the three-body decay widths to the neutralino LSP and Standard Model particles. Since all these decays, involving the gravitino, are of gravitational nature, the lifetime of the decaying particle can be of the order of seconds are more, hence called "late decays". The precise knowledge of all these partial decay widths enables the user to apply accurately the relevant cosmological constraints.

    hep-phastro-ph.COastro-ph.HEPoS(2015)·2 citations
21. 21*

    Investigating the effects of the QCD dynamics in the neutrino absorption by the Earth's interior at ultrahigh energies

    V. P. Goncalves🇧🇷 · D. R. Gratieri🇧🇷

    The opacity of the Earth to incident ultra high energy neutrinos is directly connected with the behaviour of the neutrino - nucleon (${\sigma }^{\nu N}$) cross sections in a kinematic range utterly unexplored. In this work we investigate how the uncertainties in ${\sigma }^{\nu N}$ due the different QCD dynamic models modify the neutrino absorption while they travel across the Earth. In particular, we compare the predictions of two extreme scenarios for the high energy behaviour of the cross section, which are consistent with the current experimental data. The first scenario considered is based on the solution of the linear DGLAP equations at small-$x$ and large-$Q^2$, while the second one take into account the unitarity effects in the neutrino - nucleon cross section by the imposition of the Froissart bound behaviour in the nucleon structure functions at large energies. Our results indicate that probability of absorption and the angular distribution of neutrino events are sensitive to the the QCD dynamics at ultra high energies.

    hep-phastro-ph.HEhep-exPRD(2015)·11 citations
22. 22*

    Generalized CP and $\Delta (3n^2)$ Family Symmetry for Semi-Direct Predictions of the PMNS Matrix

    Gui-Jun Ding🇨🇳 · Stephen F. King🇬🇧

    The generalized CP transformations can only be consistently defined in the context of $\Delta (3n^2)$ lepton symmetry if a certain subset of irreducible representations are present in a model. We perform a comprehensive analysis of the possible automorphisms and the corresponding CP transformations of the $\Delta (3n^2)$ group. It is sufficient to only consider three automorphisms if $n$ is not divisible by 3 while additional eight types of CP transformations could be imposed for the case of $n$ divisible by 3. We study the lepton mixing patterns which can be derived from the $\Delta (3n^2)$ family symmetry and generalized CP in the semi-direct approach. The PMNS matrix is determined to be the trimaximal pattern for all the possible CP transformations, and it can only take two distinct forms.

    hep-phPRD(2016)·53 citations
23. 23*

    The 1-loop self-energy of an electron in a strong external magnetic field revisited

    Bruno Machet🇫🇷

    I calculate the 1-loop self-energy of the lowest Landau level an electron of mass m in a strong, constant and uniform external magnetic field B, beyond its always used truncation at (ln L)^2, L=|e|B/m^2. This is achieved by evaluating the integral deduced in 1953 by Demeur and incompletely calculated in 1969 by Jancovici, which I recover from Schwinger's techniques of calculation. It yields \delta m \simeq (\alpha*m/(4*\pi))*[(\ln L -\gamma_E -3/2)^2 -9/4 +\pi/(\beta-1) + \pi^2/6 +\pi*\Gamma[1-\beta]/L^{\beta-1} +(1/L)*(\pi/(2-\beta)-5) +{\cal O}(1/L^{>= 2})] with \beta \approx 1.175 for 75 =< L =< 10000. . The (\ln L)^2 truncation exceeds the precise estimate by 45% at L=100 and by more at lower values of L, due to neglecting, among others, the single logarithmic contribution. This is doubly unjustified because it is large and because it is needed to fulfill appropriate renormalization conditions. Technically challenging improvements look therefore necessary, for example when resumming higher loops and incorporating the effects of large B on the photonic vacuum polarization, like investigated in recent years.

    hep-phInt.J.Mod.Phys.(2016)·10 citations
24. 24*

    NuWro Monte Carlo generator of neutrino interactions - first electron scattering results

    Jakub Zmuda🇵🇱 · Krzysztof M. Graczyk🇵🇱 · Cezary Juszczak🇵🇱 · Jan T. Sobczyk🇵🇱

    NuWro Monte Carlo generator of events is presented. It is a numerical environment containing all necessary ingredients to simulate interactions of neutrinos with nucleons and nuclei in realistic experimental situation in wide neutrino energy range. It can be used both for data analysis as well as studies of nuclear effects in neutrino interactions. The first results and functionalities of eWro - module of NuWro dedicated to electron nucleus scattering - are also presented.

    hep-phnucl-exnucl-thActa Phys.Polon.B(2015)·30 citations
25. 25*

    Resolution of a conflict between Laser and Elementary Particle Physics

    Elliot Leader🇬🇧

    The claim some years ago, contrary to all textbooks, that the angular momentum of a photon (and gluon) can be split in a gauge-invariant way into an orbital and spin term, sparked a major controversy in the Particle Physics community. A further cause of upset was the realization that the gluon polarization in a nucleon, a supposedly physically meaningful quantity, corresponds only to the gauge-variant gluon spin derived from Noether's theorem, evaluated in a particular gauge. On the contrary, Laser Physicists have, for decades, been happily measuring physical quantities which correspond to orbital and spin angular momentum evaluated in a particular gauge. This paper reconciles the two points of view.

    hep-phphysics.opticsquant-phPLB(2016)·30 citations
26. 26*

    Thermal photon and dilepton production and electric charge transport in a baryon rich strongly coupled QGP from holography

    Stefano Ivo Finazzo (Sao Paulo, IFT)🇧🇷 · Romulo Rougemont (Sao Paulo U.)🇧🇷

    We obtain the thermal photon and dilepton production rates in a strongly coupled quark-gluon plasma (QGP) at both zero and nonzero baryon chemical potential using a bottom-up Einstein-Maxwell-Dilaton (EMD) holographic model that is in good quantitative agreement with the thermodynamics of $(2+1)$-flavor lattice QCD around the crossover transition for baryon chemical potentials up to 400 MeV, which may be reached in the beam energy scan (BES) at RHIC. We find that increasing the temperature $T$ and the baryon chemical potential ${\mu }_B$ enhances the peak present in both spectra. We also obtain the electric charge susceptibility, the DC and AC electric conductivities and the electric charge diffusion as functions of $T$ and ${\mu }_B$. We find that electric diffusive transport is suppressed as one increases ${\mu }_B$. At zero baryon density, we compare our results for the DC electric conductivity and the electric charge diffusion with the latest lattice data available for these observables and find reasonable agreement around the crossover transition. Therefore, our holographic results may be used to constraint the magnitude of the thermal photon and dilepton production rates in a strongly coupled QGP, which we found to be at least one order of magnitude below perturbative estimates.

    hep-phhep-thnucl-thPRD(2016)·49 citations
27. 27*

    Implications of heavy flavour measurements

    Ulrich Haisch🇬🇧

    A personal account of possible implications of recent heavy flavour measurements is given.

    hep-phhep-ex1 citation
28. 28*

    Glueball spectra and Regge trajectories from a modified holographic softwall model

    Eduardo Folco Capossoli🇧🇷 · Henrique Boschi-Filho🇧🇷

    In this work we propose a modified holographic softwall model, analytically solvable, to calculate the masses of lightest scalar glueball and its radial excitations and of higher spin glueball states for both even and odd spins. From these results we obtain their respective Regge trajectories, associated with the pomeron for even spins and with the odderon for odd spins. These results are in agreement with those calculated using other approaches.

    hep-phhep-thPLB(2016)·56 citations
29. 29*

    Search for non Standard Model Higgs boson decays in events with displaced muon-jets

    Sven Dildick🇺🇸 · Teruki Kamon🇺🇸 · Slava Krutelyov🇺🇸 · Yuriy Pakhotin🇺🇸 · Anthony Rose🇺🇸 · Alexei Safonov🇺🇸 · Aysen Tatarinov🇺🇸 · Othmane Bouhali🇶🇦 · Alfredo Martin Castaneda Hernandez (for the CMS Collaboration)🇶🇦

    New light bosons that couple weakly to the standard model (SM) particles are predicted in various extensions of the standard model (BSM). Examples include supersymmetric (SUSY) theories with extended Higgs sectors or with a hidden valleys (dark SUSY). In these models the light bosons can be produced directly in the decay of a Higgs boson, or as part of the decay chain of SUSY particles. Depending on the branching fraction, the exotic decays of the SM-Higgs can be undetected in standard analysis techniques or due to its modified production cross section of the Higgs bosons at the LHC. Therefore, direct searches for non-SM decays of the Higgs boson are the fastest way to understand the nature of the Higgs boson. Either it will confirm its SM character, or it will rule out a whole array of BSM scenarios. We present status of the search at CMS for non-SM Higgs boson decays in events with displaced muon-jets.

    ↳ hep-exhep-ph0 citations
30. 30*

    Structure of the neutral pion and its electromagnetic transition form factor

    K. Raya🇲🇽 · L. Chang🇨🇳 · A. Bashir🇲🇽 · J. J. Cobos-Martinez🇲🇽 · L. X. Gutiérrez-Guerrero🇲🇽 · C. D. Roberts🇺🇸 · P. C. Tandy🇺🇸

    The ${\gamma }^{\ast }\gamma \to {\pi }^0$ transition form factor, $G(Q^2)$, is computed on the entire domain of spacelike momenta using a continuum approach to the two valence-body bound-state problem in relativistic quantum field theory: the result agrees with data obtained by the CELLO, CLEO and Belle Collaborations. The analysis unifies this prediction with that of the pion's valence-quark parton distribution amplitude (PDA) and elastic electromagnetic form factor, and demonstrates, too, that a fully self-consistent treatment can readily connect a pion PDA that is a broad, concave function at the hadronic scale with the perturbative QCD prediction for the transition form factor in the hard photon limit. The normalisation of that limit is set by the scale of dynamical chiral symmetry breaking, which is a crucial feature of the Standard Model. Understanding of the latter will thus remain incomplete until definitive transition form factor data is available on $Q^2>10$GeV${}^2$.

    ↳ nucl-thhep-exhep-lathep-ph+1PRD(2016)·131 citations
31. 31*

    Gaussian fidelity distorted by external fields

    Jonas F. G. Santos🇧🇷 · Alex E. Bernardini🇧🇷

    Gaussian state decoherence aspects due to interacting magnetic-like and gravitational fields are quantified through the quantum fidelity and Shannon entropy in the scope of the phase-space representation of elementary quantum systems. For Gaussian Wigner functions describing harmonic oscillator states, an interacting external field destroys the quantum fidelity and introduces a quantum beating behavior. Likewise, it introduces harmonic profiles for free particle systems. Some aspects of quantum decoherence for the quantum harmonic oscillator and for the free particle limit are also quantified through the Shannon entropy. For the gravitational quantum well, the effect of a magnetic-like field on the quantum fidelity is suppressed by the linear term of the gravitational potential. To conclude, one identifies a fine formal connection of the quantum decoherence aspects discussed here with the noncommutative quantum mechanics.

    ↳ quant-phhep-phPhysica A(2016)·6 citations
32. 32*

    High Energy Scattering in Higher Dimensional Theories

    Jnanadeva Maharana🇮🇳

    The high energy behavior of scattering amplitudes in spacetime dimensions, $D>4$, is investigated. The bound on total cross sections, ${\sigma }_t\le Constant(loss{)}^{D-2}$, $D\ge 4$ has been obtained in the past under usual assumptions. I derive new bound on scattering amplitudes in the region $|t|<T_0$, $t$ being momentum transfer squared. and $T_0$ is a constant. The existence of a zero-free region for the amplitude in complex t-plane, is proved. I prove stronger upper and lower bounds for the absorptive amplitude in the domain $0<t<T_0$.

    ↳ math-phhep-phmath.MPJ.Math.Phys.(2015)·3 citations
33. 33*

    Hadrons with c-s content: past, present and future

    Elisabetta Prencipe🇩🇪

    The PANDA detector at FAIR aims to conduct an antiproton-proton experiment with a very high rate capability. It is expected to feature high mass resolution, more than 20 times better than achieved at B-factories. PANDA is in a unique position to perform highly resolved mass scan, and to measure the width of very narrow charm and charmonium-like states, whose nature is still unknown, 12 years after their discovery. In this report, we present a method to determine the width of the $D_{s0}^{\ast }(2317{)}^{+}$. We discuss the future perspectives of PANDA, based on our present simulations, in relation with the recent measurements performed by LHCb and the performances in this field at the B factories.

    ↳ hep-exhep-ph5 citations
34. 34*

    Gravity Resonance Spectroscopy and Einstein-Cartan Gravity

    Hartmut Abele🇦🇹 · Andrei Ivanov🇦🇹 · Tobias Jenke🇦🇹 · Mario Pitschmann🇦🇹 · Peter Geltenbort🇫🇷

    The qBounce experiment offers a new way of looking at gravitation based on quantum interference. An ultracold neutron is reflected in well-defined quantum states in the gravity potential of the Earth by a mirror, which allows to apply the concept of gravity resonance spectroscopy (GRS). This experiment with neutrons gives access to all gravity parameters as the dependences on distance, mass, curvature, energy-momentum as well as on torsion. Here, we concentrate on torsion.

    ↳ gr-qchep-ph5 citations
35. 35*

    Multiplicity fluctuations in heavy-ion collisions using canonical and grand-canonical ensemble

    P. Garg🇮🇳 · D. K. Mishra🇮🇳 · P. K. Netrakanti🇮🇳 · A. K. Mohanty🇮🇳

    We report the higher order cumulants and their ratios for baryon, charge and strangeness multiplicity in canonical and grand-canonical ensembles in ideal thermal model including all the resonances. When the number of conserved quanta is small, an explicit treatment of these conserved charges is required, which leads to a canonical description of the system and the fluctuations are significantly different from the grand canonical ensemble. Cumulant ratios of total charge and net-charge multiplicity as a function of collision energies are also compared in grand canonical ensemble.

    ↳ nucl-thhep-phnucl-exEPJA(2016)·3 citations
36. 36*

    Rare Decays Probing Physics Beyond the Standard Theory

    Frederic Teubert🇨🇭

    In the last 50 years we have seen how an initially ad-hoc and not widely accepted theory of the strong and electroweak interactions (Standard Theory: ST) has correctly predicted the entire accelerator based experimental observations with incredible accuracy (with the important exception of neutrino oscillation experiments). Decays of the ST particles (quarks and leptons), which are rare due to some symmetry of the theory, have played an important role in the formalism of the ST. These rare decays have been powerful tools to search for new particle interactions with the ST particles, which may not necessarily have the same symmetries. In this article, I will describe the indirect search for evidence of new physics (NP) using quark and lepton flavour changing neutral decays, which are highly suppressed within the ST, and constitute strong probes of potential new flavour structures.

    ↳ hep-exhep-phAdv.Ser.Direct.High Energy Phys.(2016)·0 citations
37. 37*

    The long and winding road from chiral effective Lagrangians to nuclear structure

    Ulf-G Meißner🇩🇪

    I review the chiral dynamics of nuclear physics. In the first part, I discuss the new developments in the construction of the forces between two, three and four nucleons which have been partly carried out to fifth order in the chiral expansion. It is also shown that based on these forces in conjunction with the estimation of the corresponding theoretical uncertainties, the need for three-nucleon forces in few nucleon systems can be unambiguously established. I also introduce the lattice formulation of these forces, which allow for truly ab initio calculations of nuclear structure and reactions. I present some pertinent results of the nuclear lattice approach. Finally, I discuss how few-nucleon systems and nuclei can be used to explore symmetries and physics within and beyond the Standard Model.

    ↳ nucl-thhep-lathep-phnucl-exPhys.Scripta(2016)·37 citations
38. 38*

    Review on High energy String Scattering Amplitudes and Symmetries of String Theory

    Jen-Chi Lee🇹🇼 · Yi Yang🇹🇼

    We review high energy symmetries of string theory at both the fixed angle or Gross regime (GR) and the fixed momentum transfer or Regge regime (RR). We calculated in details high energy string scattering amplitudes at arbitrary mass levels for both regimes. We discovered infinite linear relations among fixed angle string amplitudes conjectured by Gross in 1988 from decoupling of high energy zero-norm states (ZNS), and infinite recurrence relations among Regge string amplitudes from Kummer function U and Appell function F_1. However, the linear relations we obtained in the GR corrected [27-32] the saddle point calculations of Gross, Gross and Mende and Gross and Manes [1-5]. Our results were consistent with the decoupling of high energy ZNS or unitarity of the theory while those of them were not. In addition, for the case of high energy closed string scatterings, our results [36] differ from theirs by an oscillating prefactor which was crucial to recover the KLT relation valid for all energies. In the GR/RR regime, all high energy string amplitudes can be solved by these linear/recurrence relations so that all GR/RR string amplitudes can be expressed in terms of one single GR/RR string amplitude. In addition, we found an interesting link between string amplitudes of the two regimes, and discovered that at each mass level the ratios among fixed angle amplitudes can be extracted from Regge string scattering amplitudes. This result enables us to argue that the known SL(5,C) dynamical symmetry of the Appell function F_1 is crucial to probe high energy spacetime symmetry of string theory.

    ↳ hep-thhep-phmath-phmath.MP28 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.