PaperPanorama

HEP Phenomenology·hep-ph

Mon·May 7, 2018

24 papers—17 primary·7 cross-listed·reconstructed*

  1. 01*

    Dark matter in the KL moduli stabilization scenario with SUSY breaking sector from SQCD

    Thaisa C. da C. Guio🇩🇪 · Ernany R. Schmitz🇩🇪

    We investigate neutralino dark matter from a string/M-theory perspective. Using the Kallosh-Linde (KL) scenario to stabilize the string moduli requires supersymmetry breaking for uplifting to a de Sitter vacuum. We consider the free magnetic dual description of SUSY QCD with massive flavours, the Intriligator-Seiberg-Shih model (ISS), as an F-term dynamical SUSY breaking sector. This framework allows for a gravitino mass in the TeV range. Moreover, due to the plethora of particles from the ISS sector, we investigate the consequences of coupling the MSSM with the KL-ISS setup to obtain constraints from both late entropy production and the dark matter relic density. In addition to thermal neutralino production, we consider neutralino production via the decays of gravitinos and ISS fields.

    hep-phhep-thJHEP(2019)·4 citations
  2. 02*

    The importance of ln(1/x) resummation: a new QCD analysis of HERA data

    Francesco Giuli🇬🇧

    In this contribution, I present a new QCD fit to final combined HERA deep-inelastic scattering cross-section data incorporating -resummation terms. This fit has been performed within the xFitter framework. The main effect of including such resummed terms results not only in a better description of the low- and low- data, but also in a steeply rising gluon PDF at low x for low scales. Furthermore, the kinematic region where this resummation is important is delineated. This contribution is based on the results presented in arXiv:1802.00064.

    hep-ph0 citations
  3. 03*

    Pion masses under intense magnetic fields within the NJL model

    M. Coppola🇦🇷 · D. Gomez Dumm🇦🇷 · N.N. Scoccola🇦🇷

    The behavior of charged and neutral pion masses in the presence of a static uniform magnetic field is studied in the framework of the two-flavor Nambu-Jona-Lasinio (NJL) model. Analytical calculations are carried out employing the Ritus eigenfunction method. Numerical results are obtained for definite model parameters, comparing the predictions of the model with present lattice QCD (LQCD) results.

    hep-ph1 citation
  4. 04*

    Pair production of Higgs boson in NMSSM at the LHC with next-to-lightest CP-even Higgs boson being SM-like

    Zhaoxia Heng🇨🇳 · Xue Gong🇨🇳 · Haijing Zhou🇨🇳

    The next-to-minimal supersymmetric standard model (NMSSM) more naturally accommodates a Higgs boson with a mass of approximately 125 GeV than the minimal supersymmetric standard model (MSSM). In this work, we assume that the next-to-lightest CP-even Higgs boson is the SM-like Higgs boson , whereas the lightest CP-even Higgs boson is dominantly singlet-like. We discuss the , , and pair production processes via gluon-gluon fusion at the LHC for an collision energy of 14 TeV, and we consider the cases in which one Higgs boson decays to and the other one decays to or . We find that, for 62 GeV, the cross section of the process is relatively large and maximally reaches 5400 fb, and the production rate of the final state can reach 1500 fb, which make the detection of this final state possible for future searches of an integrated luminosity of 300 and 3000 . This is mainly due to the contributions from the resonant production process and the relatively large branching ratio of and . The cross sections of the and production processes maximally reach 28 fb and 133 fb, respectively.

    hep-phCPC(2018)·12 citations
  5. 05*

    Matching the Nonequilibrium Initial Stage of Heavy Ion Collisions to Hydrodynamics with QCD Kinetic Theory

    Aleksi Kurkela🇨🇭 · Aleksas Mazeliauskas🇩🇪 · Jean-François Paquet🇺🇸 · Sören Schlichting🇺🇸 · Derek Teaney🇺🇸

    High-energy nuclear collisions produce a nonequilibrium plasma of quarks and gluons which thermalizes and exhibits hydrodynamic flow. There are currently no practical frameworks to connect the early particle production in classical field simulations to the subsequent hydrodynamic evolution. We build such a framework using nonequilibrium Green's functions, calculated in QCD kinetic theory, to propagate the initial energy-momentum tensor to the hydrodynamic phase. We demonstrate that this approach can be easily incorporated into existing hydrodynamic simulations, leading to stronger constraints on the energy density at early times and the transport properties of the QCD medium. Based on (conformal) scaling properties of the Green's functions, we further obtain pragmatic bounds for the applicability of hydrodynamics in nuclear collisions.

    hep-phnucl-thPRL(2019)·256 citations
  6. 06*

    An extended gauge mediation for muon explanation

    Gautam Bhattacharyya🇮🇳 · Tsutomu T. Yanagida🇯🇵 · Norimi Yokozaki🇯🇵

    It is increasingly becoming difficult, within a broad class of supersymmetric models, to satisfactorily explain the discrepancy between the measured and its standard model prediction, and at the same time satisfy all the other constraints. In this paper we propose a new scheme of gauge mediation by introducing new soft supersymmetry breaking mass parameters for the Higgs sector in a minimal setup containing only a pair of messenger fields of SU(5). This enables us to explain the discrepancy while avoiding all the existing constraints. We also provide possible dynamical origin of the new soft mass parameters. The wino and higgsino weighing below 500 GeV constitute the smoking gun signal at the (high luminosity) LHC.

    hep-phhep-exPLB(2018)·19 citations
  7. 07*

    Living Orthogonally: Quasi-universal Extra Dimensions

    Mathew Thomas Arun🇮🇳 · Debajyoti Choudhury🇮🇳 · Divya Sachdeva🇮🇳

    The minimal Universal Extra Dimension scenario is highly constrained owing to opposing constraints from the observed relic density on the one hand, and the non-observation of new states at the LHC on the other. Simple extensions in five-dimensions can only postpone the inevitable. Here, we propose a six-dimensional alternative with the key feature being that the SM quarks and leptons are localized on orthogonal directions whereas gauge bosons traverse the entire bulk. Several different realizations of electroweak symmetry breaking are possible, while maintaining agreement with low energy observables. This model is not only consistent with all the current constraints opposing the minimal Universal Extra Dimension scenario but also allows for a multi-TeV dark matter particle without the need for any fine-tuning. In addition, it promises a plethora of new signatures at the LHC and other future experiments.

    hep-phJHEP(2019)·9 citations
  8. 08*

    Measuring the ratio of and couplings through production

    Cheng-Wei Chiang🇹🇼 · Xiao-Gang He🇹🇼 · Gang Li🇹🇼

    For a generic Higgs boson, measuring the relative sign and magnitude of its couplings with the and bosons is essential in determining its origin. Such a test is also indispensable for the 125-GeV Higgs boson. We propose that the ratio of the and couplings can be directly determined through the production, where denotes a generic Higgs boson, owing to the tree-level interference effect. While this is impractical at the LHC due to the limited sensitivity, it can be done at future colliders, such as a 500-GeV ILC with the beam polarization in the and channels. The discovery potential of a general ratio and the power to discriminate it from the SM value are studied in detail. Combining the cross section of with the measurements of coupling at the HL-LHC, one can further improve the sensitivity of .

    hep-phJHEP(2018)·12 citations
  9. 09*

    Nonlinear trident pair production in an arbitrary plane wave: a focus on the properties of the transition amplitude

    F. Mackenroth🇩🇪 · A. Di Piazza🇩🇪

    The process of nonlinear electron-positron pair production by an electron colliding with an arbitrary plane wave electromagnetic field (nonlinear trident pair production) is studied analytically and numerically. Special emphasis is put on the properties of the transition amplitude. In fact, its original expression as resulting from applying the Wick's theorem turns out to be divergent and not to manifestly fulfill gauge invariance. By restoring the latter, the amplitude is regularized and investigated in different regimes. In particular, the amplitude is divided into a two-step and a one-step contributions, depending on the scaling dependence on the laser pulse duration. The corresponding contributions to the positron angular distribution spectra and the resulting interference terms are studied numerically emphasizing the possibility of measuring experimentally the contribution of the one-step contribution.

    hep-phquant-phPRD(2018)·53 citations
  10. 10*

    On the systematic uncertainties in DUNE and their role in New Physics studies

    Davide Meloni🇮🇹

    In the recent years experiments have established the existence of neutrino oscillations and most of the oscillation parameters have been measured with a good accuracy. The search for New Physics in neutrino oscillation will be an experimental concrete possibility in the next future. In this paper we investigate the ability of the DUNE facility to search for Non Standard Interaction (NSI) in neutrino propagation in matter, emphasizing the role of different assumptions on the shape and absolute normalization errors of both and signals. We also study in detail the effects of NSI and systematics in the extraction of standard oscillation parameters.

    hep-phJHEP(2018)·22 citations
  11. 11*

    Coherent axion-photon transformations in the forward scattering on atoms

    V.V. Flambaum🇦🇺 · I.B. Samsonov🇦🇺 · H.B. Tran Tan🇦🇺 · D. Budker🇩🇪

    In certain laboratory experiments the production and/or detection of axions is due to the photon-axion transformations in a strong magnetic field. This process is coherent, and the rate of the transformation is proportional to the length and magnitude of the magnetic field squared, . In the present paper, we consider coherent production of axions due to the forward scattering of photons on atoms or molecules. This process may be represented as being due to an effective electromagnetic field which converts photons to axions. We present analytical expressions for such effective magnetic and electric fields induced by resonant atomic M0 and M1 transitions, as well as give some numerical estimates for these fields. The corresponding experiments would allow one to measure the electron-axion coupling constant in the same way as the photon-axion coupling is studied.

    hep-phphysics.atom-phPRD(2018)·8 citations
  12. 12*

    Prospects for exploring New Physics in Coherent Elastic Neutrino-Nucleus Scattering

    Julien Billard🇫🇷 · Joseph Johnston🇺🇸 · Bradley J. Kavanagh🇳🇱

    Coherent Elastic Neutrino-Nucleus Scattering (CENS) is a Standard Model process that, although predicted for decades, has only been detected recently by the COHERENT collaboration. Now that CENS has been discovered, it provides a new probe for physics beyond the Standard Model. We study the potential to probe New Physics with CENS through the use of low temperature bolometers at a reactor source. We consider contributions to CENS due to a neutrino magnetic moment (NMM), Non-Standard Interactions (NSI) that may or may not change flavor, and simplified models containing a massive scalar or vector mediator. Targets consisting of Ge, Zn, Si, CaWO, and AlO are examined. We show that by reaching a percentage-level precision measurement on the CENS energy spectrum down to eV, forthcoming experiments will improve by two orders of magnitude both the CENS-based NMM limit and the search for new massive mediators. Additionally, we demonstrate that such dedicated low-threshold CENS experiments will lead to unprecedented constraints on NSI parameters (particularly when multiple targets are combined) which will have major implications for the global neutrino physics program.

    hep-phhep-exJCAP(2018)·149 citations
  13. 13*

    Invisible neutrino decay in the light of NOvA and T2K data

    Sandhya Choubey🇮🇳 · Debajyoti Dutta🇮🇳 · Dipyaman Pramanik🇮🇳

    We probe for evidence of invisible neutrino decay in the latest NOvA and T2K data. It is seen that both NOvA and T2K data sets are better fitted when one allows for invisible neutrino decay. We consider a scenario where only the third neutrino mass eigenstate is unstable and decays into invisible components. The best-fit value for the lifetime is obtained as s/eV from the analysis of the NOvA neutrino data and s/eV from the analysis of the T2K neutrino and anti-neutrino data. The combined analysis of NOvA and T2K gives s/eV as the best-fit lifetime. However, the statistical significance for this preference is weak with the no-decay hypothesis still allowed at close to 1.5 C.L. from the combined data sets, while the two experiment individually are consistent with no-decay even at the 1 C.L. At 3 C.L., the NOvA and T2K data give a lower limit on the neutrino lifetime of is s/eV and s/eV, respectively, while NOvA and T2K combined constrain s/eV. We also show that in presence of decay the best-fit value in the vs plane changes significantly and the allowed regions increase significantly towards higher .

    hep-phJHEP(2018)·63 citations
  14. 14*

    Three-loop neutrino masses via new massive gauge bosons from GUT

    Bhaskar Dutta🇺🇸 · Sumit Ghosh🇺🇸 · Ilia Gogoladze🇺🇸 · Tianjun Li🇨🇳

    We propose an model arising from grand unified theory. We show that the tiny neutrino masses in this model can be generated at the three-loop involving the gauge bosons. With Yukawa couplings around 0.01 or larger and TeV-scale gauge bosons, we show that the neutrino oscillation data can be explained naturally by presenting a concrete benchmark set of input parameters. All new particles are around the TeV scale. Thus our model can be tested at the ongoing/future collider experiments.

    hep-phPRD(2018)·15 citations
  15. 15*

    Probing a simplified, model of anomalies using -tags, leptons and missing energy

    Mohammad Abdullah🇺🇸 · Julian Calle🇨🇴 · Bhaskar Dutta🇺🇸 · Andrés Flórez🇨🇴 · Diego Restrepo🇨🇴

    We study the LHC sensitivity to a produced via bottom and charm quarks and decaying to flavor leptons in the mass range 200-1000 GeV. We show that the extra quarks necessitated by the production mechanism can improve the background rejection compared to an inclusive analysis relying solely on -tagging and . We present prospective limits on the couplings and compare them to the best fit to the anomalies in meson decays.

    hep-phPRD(2018)·53 citations
  16. 16*

    Black hole interference patterns in flavour oscillations

    Jean Alexandre🇬🇧 · Katy Clough🇩🇪

    Motivated by neutrino astronomy, we consider a plane wave of coupled and massive flavours, scattered by a static black hole, and describe analytically and numerically the corresponding oscillation probability in the surrounding space. Both the interpretation as particles travelling along geodesics and as scattered waves are studied, and consistently show a non-trivial and potentially long range interference pattern, in contrast to the spatially uniform transition probability in a flat spacetime. We introduce a numerical method for studying the oscillations around black holes, which accounts for the full curved geometry and flavour wave mixing. Whilst limited to the region immediately around the black hole, this numerical approach has the potential to be used in more general contexts, revealing the complex interference patterns which defy analytic methods.

    hep-phgr-qcPRD(2018)·33 citations
  17. 17*

    Rare decay in the relativistic quark model

    R. N. Faustov🇷🇺 · V. O. Galkin🇷🇺

    The relativistic quark model based on the quasipotential approach with the QCD-motivate potential is employed for the calculation of the form factors of the rare weak transitions. Their momentum dependence is explicitly determined without additional assumptions and extrapolations in the whole kinematical range of the momentum transfer squared . The differential decay branching fractions and angular distributions are calculated on the basis of these form factors. Both the perturbative and effective Wilson coefficients, which include contributions of vector meson resonances, are used. The calculated branching fraction of the rare decay is well consistent with the experimental upper limit very recently set by the LHCb Collaboration.

    hep-phhep-exEPJC(2018)·22 citations
  18. 18*

    Where are the Ultra High Energy Cosmic Ray (UHECR) originated?

    Daniele Fargion🇮🇹 · Pier Giorgio De Sanctis Lucentini🇷🇺 · Maxim Yu. Khlopov🇷🇺

    We consider the recent results on UHECR (Ultra High Energy Cosmic Ray) composition and their distribution in the sky from ten EeV energy (the dipole anisotropy) up to the highest UHECR energies and their clustering maps: UHECR have been found mostly made by light and lightest nuclei. We summarized the arguments that favor a few localized nearby extragalactic sources for most UHECR as CenA, NG 253, M82. We comment also on the possible partial role of a few remarkable galactic UHECR sources. Finally we revive the eventual role of a relic neutrino eV mass in dark hot halo (hit by ZeV neutrinos) to explain the new UHECR clustering events centered around a very far cosmic AGN sources as 3C 454.

    ↳ astro-ph.HEgr-qchep-phPoS(2018)·2 citations
  19. 19*

    Nonlinear Compton scattering of an ultra-intense laser pulse in a plasma

    F. Mackenroth🇩🇪 · N. Kumar🇩🇪 · N. Neitz🇩🇪 · C.H. Keitel🇩🇪

    Laser pulses traveling through a plasma can feature group velocities significantly differing from the speed of light in vacuum. This modifies the well-known Volkov states of an electron inside a strong laser-field from the vacuum case and consequently all quantum electrodynamical effects triggered by the electron. Here we present an in-depth study of the basic process of photon emission by an electron scattered from an intense short laser pulse inside a plasma, labeled nonlinear Compton scattering, based on modified Volkov solutions derived from first principles. Consequences of the nonlinear, plasma-dressed laser dispersion on the Compton spectra of emitted photons and implications for high-intensity laser-plasma experiments are pointed out.

    ↳ physics.plasm-phhep-phPRE(2019)·23 citations
  20. 20*

    Complete integration-by-parts reductions of the non-planar hexagon-box via module intersections

    Janko Boehm🇩🇪 · Alessandro Georgoudis🇸🇪 · Kasper J. Larsen🇬🇧 · Hans Schoenemann🇩🇪 · Yang Zhang🇨🇭

    We present the powerful module-intersection integration-by-parts (IBP) method, suitable for multi-loop and multi-scale Feynman integral reduction. Utilizing modern computational algebraic geometry techniques, this new method successfully trims traditional IBP systems dramatically to much simpler integral-relation systems on unitarity cuts. We demonstrate the power of this method by explicitly carrying out the complete analytic reduction of two-loop five-point non-planar hexagon-box integrals, with degree-four numerators, to a basis of master integrals.

    ↳ hep-thhep-phmath.AGJHEP(2018)·89 citations
  21. 21*

    Liberated N=1 Supergravity

    Fotis Farakos🇧🇪 · Alex Kehagias🇬🇷 · Antonio Riotto🇨🇭

    We discuss a new interaction for chiral models in four-dimensional supergavity. It contains a new arbitrary function in addition to the Kähler potential and superpotential. Its features include linearly realized off-shell supersymmetry, Kähler-Weyl invariance and broken supersymmetry. The corresponding scalar potential is augmented by the arbitrary function which allows freedom in constructing low-energy phenomenological models and inflationary models rooted in supergravity.

    ↳ hep-thhep-phJHEP(2018)·30 citations
  22. 22*

    Solar Corona Heating by the Axion Quark Nugget Dark Matter

    Nayyer Raza🇨🇦 · Ludovic van Waerbeke🇨🇦 · Ariel Zhitnitsky🇨🇦

    In this work we advocate for the idea that two seemingly unrelated 80-year-old mysteries - the nature of dark matter and the high temperature of the million degree solar corona - may have resolutions that lie within the same physical framework. The current paradigm is that the corona is heated by nanoflares, which were originally proposed as miniature versions of the observed solar flares. It was recently suggested that the nanoflares could be identified as annihilation events of the nuggets from the Axion Quark Nugget (AQN) dark matter model. This model was invented as an explanation of the observed ratio , based only on cosmological and particle physics considerations. In this new paradigm, the AQN particles moving through the coronal plasma and annihilating with normal matter can lead to the drastic change of temperatures seen in the Sun's Transition Region (TR), and significantly contribute to the extreme ultraviolet (EUV) excess of . To test this proposal, we perform numerical simulations with a realistically modeled AQN particle distribution and explore how the nuggets interact with the coronal plasma. Remarkably, our simulations predict the correct energy budget for the solar corona, and show that the energy injection mostly occurs at an altitude of around 2000 km, which is where the TR lies. Therefore, we propose that these long unresolved mysteries could be two sides of the same coin. We make several predictions based on this proposal, some of which could be tested by the recently launched NASA mission, the Parker Solar Probe.

    ↳ astro-ph.SRastro-ph.COastro-ph.HEhep-phPRD(2018)·48 citations
  23. 23*

    Statistical hadron-gas treatment of systems created in proton-proton interactions at CERN SPS

    V. V. Begun🇵🇱 · V. Vovchenko🇩🇪 · M. I. Gorenstein🇺🇦 · H. Stoecker🇩🇪

    We analyze the newest data from the NA61/SHINE collaboration which, in addition to previous results on pions and kaons, include mean multiplicities of , , and -mesons produced in inelastic proton-proton (p+p) interactions at ~GeV. The canonical ensemble formulation of the ideal hadron resonance gas (HRG) model is used with exact conservation of net baryon number , electric charge , and strangeness . The chemical freeze-out parameters in p+p interactions are obtained and compared to those in central nucleus-nucleus collisions. Several features of p+p interactions at the CERN SPS within a statistical model are studied: 1) the inclusion of the -meson yields in thermal fits worsens significantly the fit quality; 2) the data show large event-by-event multiplicity fluctuations in inelastic p+p interactions which can not be explained by a single fireball described by a statistical model; 3) the fits within the canonical ensemble formulation of HRG do not give any improvement over the fits within the grand canonical ensemble formulation, i.e., there are no indications for existence of a single statistical system in p+p inelastic interactions in the considered energy range.

    ↳ nucl-thhep-exhep-phnucl-exPRC(2018)·17 citations
  24. 24*

    Finite temperature corrections to the energy-momentum tensor at one-loop in static space-times

    Franco D. Albareti🇪🇸 · Antonio L. Maroto🇪🇸 · Francisco Prada🇪🇸

    Finite temperature corrections to the effective potential and the energy-momentum tensor of a scalar field are computed in a perturbed Minkoswki space-time. We consider the explicit mode decomposition of the field in the perturbed geometry and obtain analytical expressions in the non-relativistic and ultra-relativistic limits to first order in scalar metric perturbations. In the static case, our results are in agreement with previous calculations based on the Schwinger-De Witt expansion which indicate that thermal effects in a curved space-time can be encoded in the local Tolman temperature at leading order in perturbations and in the adiabatic expansion. We also study the shift of the effective potential minima produced by thermal corrections in the presence of static gravitational fields. Finally we discuss the dependence on the initial conditions set for the mode solutions.

    ↳ hep-thgr-qchep-phPRD(2018)·0 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.