Fri·Mar 24, 2017Friday·March 24, 2017

1. 01*

   Modification of Higgs Couplings in Minimal Composite Models

   Da Liu🇺🇸 · Ian Low🇺🇸 · Carlos E. M. Wagner🇺🇸

   We present a comprehensive study of the modifications of Higgs couplings in the SO(5)/SO(4) minimal composite model. We focus on three couplings of central importance to Higgs phenomenology at the LHC: the couplings to top and bottom quarks and the coupling to two gluons. We consider three possible embeddings of the fermionic partners in 5, 10 and 14 of SO(5) and find tth and bbh couplings to be always suppressed in 5 and 10, while in 14 they can be either enhanced or suppressed. Assuming partial compositeness, we analyze the interplay between the tth coupling and the top sector contribution to the Coleman-Weinberg potential for the Higgs boson, and the correlation between tth and ggh couplings. In particular, if the electroweak symmetry breaking is triggered radiatively by the top sector, we demonstrate that the ratio of the tth coupling in composite Higgs models over the Standard Model expectation is preferred to be less than the corresponding ratio of the ggh coupling.

   hep-phPRD(2017)·31 citations
2. 02*

   On NMSSM Higgs Search Strategies at the LHC and the Mono-Higgs Signature in Particular

   Sebastian Baum🇸🇪 · Katherine Freese🇸🇪 · Nausheen R. Shah🇺🇸 · Bibhushan Shakya🇺🇸

   We study the collider phenomenology of the extended Higgs sector of the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The region of NMSSM parameter space favored by a 125\,GeV SM-like Higgs and naturalness generically features a light Higgs and neutralino spectrum as well as a large $\mathcal{O}(1)$ coupling between the Higgs doublets and the NMSSM singlet fields. In such regimes, the heavier Higgs bosons can decay dominantly into lighter Higgs bosons and neutralinos. We study the prospects of observing such decays at the 13\,TeV LHC, focusing on mono-Higgs signatures as probes of such regions of parameter space. We present results in a model-independent framework as well as in the NMSSM. In the NMSSM, we find that the mono-Higgs channel can probe TeV scale Higgs bosons and has sensitivity even in the low tan$\beta$, large $m_A$ regime that is difficult to probe in the MSSM. Unlike for many conventional Higgs searches, the reach of the mono-Higgs channel will improve significantly with the increased luminosity expected to be collected at the LHC in the ongoing and upcoming runs.

   hep-phhep-exPRD(2017)·35 citations
3. 03*

   Study of the homogeneous Bethe-Salpeter equation in the 2+1 Minkowski space

   V. Gigante🇧🇷 · J. H. Alvarenga Nogueira🇧🇷 · E. Ydrefors🇧🇷 · C. Gutierrez🇧🇷

   The problem of a relativistic bound-state system consisting of two scalar bosons interacting through the exchange of another scalar boson, in 2+1 space-time dimensions, has been studied. The Bethe-Salpeter equation (BSE) was solved by adopting the Nakanishi integral representation (NIR) and the Light-Front projection. The NIR allows us to solve the BSE in Minkowski space, which is a big and important challenge, since most of non-perturbative calculations are done in Euclidean space, e.g. Lattice and Schwinger-Dyson calculations. We have in this work adopted an interaction kernel containing the ladder and cross-ladder exchanges. In order to check that the NIR is also a good representation in 2+1, the coupling constants and Wick-rotated amplitudes have been computed and compared with calculations performed in Euclidean space. Very good agreement between the calculations performed in the Minkowski and Euclidean spaces has been found. This is an important consistence test that allows Minkowski calculations with the Nakanishi representation in 2+1 dimensions. This relativistic approach will allow us to perform applications in condensed matter problems in a near future.

   hep-phcond-mat.str-elInt.J.Mod.Phys.Conf.Ser.(2017)·1 citation
4. 04*

   Heavy-heavy and heavy-light quarks interactions generated by QCD vacuum

   Mirzayusuf Musakhanov🇺🇿

   The QCD vacuum is populated by instantons that correspond to the tunneling processes in the vacuum. This mechanism creates the strong vacuum gluon fields. As result, the QCD vacuum instantons induce very strong interactions between light quarks, initially almost massless. Such a strong interactions bring a large dynamical mass M of the light quarks and bound them to produce almost massless pions in accordance with the spontaneous breaking of the chiral symmetry (SBCS). On the other hand, the QCD vacuum instantons also interact with heavy quarks and responsible for the generation of the heavy-heavy and heavy-light quarks interactions, with a traces of the SBCS. If we take the average instanton size \rho=0.33 fm, and the average inter-instanton distance R=1 fm we obtain the dynamical light quark mass to be M = 365 MeV and the instanton media contribution to the heavy quark mass \Delta M=70 MeV. These factors define the coupling between heavy-light and heavy-heavy quarks induced by the QCD vacuum instantons. We consider first the instanton effects on the heavy-heavy quarks potential, including its spin-dependent part. We also discuss those effects on the masses of the charmonia and their hyperfine mass splittings. At the second part we discuss the interaction between a heavy and light quarks generated by instantons and it's effects.

   hep-phEPJ Web Conf.(2017)·6 citations
5. 05*

   Heavy neutral pseudoscalar decays into gauge bosons in the Littlest Higgs Model

   J. I. Aranda🇲🇽 · E. Cruz-Albaro🇲🇽 · D. Espinosa-Gómez🇲🇽 · J. Montaño🇲🇽 · F. Ramírez-Zavaleta🇲🇽 · E. S. Tututi🇲🇽

   We study two-body decays of a new neutral pseudoscalar into gauge bosons within the context of the Littlest Higgs model. Concretely, the ${\Phi }^P\to WW,VV,gg$ processes induced at the one-loop level, with $V=\gamma ,Z$, are considered. Since the branching ratios of the ${\Phi }^P\to VV$ decays result very suppressed, only the ${\Phi }^P\to WW,gg$ processes are thoroughly studied. The branching ratios for the ${\Phi }^P\to gg$ and ${\Phi }^P\to WW$ decays are of the order of $10^{-4}$ and $10^{-6}$, respectively, for $f$ around 2 TeV, which represents the global symmetry breaking scale of the theory. The production cross section of the ${\Phi }^P$ boson via gluon fusion at LHC is estimated.

   hep-phJ.Phys.G(2017)·4 citations
6. 06*

   The Two Higgs-Doublet Extension of the Standard Model and S3 Symmetry

   Chilong Lin🇹🇼 · Chien-Er Lee🇹🇼 · Yeou-Wei Yang🇹🇼

   (This is a recompiled version of $Chin.J.ofPhys.,Vol.26,No.4,180$ since the previous available electronic document on web was unreadable) We impose a permutation symmetry S3 upon the two Higgs doublet extension of the SU(2) x U( 1) standard model, and then break S3 symmetry spontaneously. A mass relation is obtained from which the mass of the top quark is predicted to be 39 Gev at 1 Gev renormalization scale, if the relative strength between the coupling of the first Higgs field with the up-type quarks is assumed to be the same as that with the down-type quarks. We find that in our model the flavor changing neutral currents vanish automatically.

   hep-phJ.Phys.C(1988)·5 citations
7. 07*

   Generalized fermion symmetry, its currents algebra and Ward-Takahashi identities

   Amir H. Fariborz🇺🇸 · Renata Jora🇷🇴

   We introduce a new local symmetry into the fermion sector of a gauge invariant Lagrangian which may or may not contain a scalar or spontaneous symmetry breaking. The Standard Model in the unitary gauge and QCD are particular cases where this symmetry may apply. We determine the associated vector and axial vector currents and their conservation laws. We show that a single current conservation law may lead to multiple Ward-Takahashi identities. Our results can potentially have important consequences for effective models of low-energy QCD and hadron structure. As an specific example, we discuss the construction of tetraquark states within a generalized linear sigma model and show that this new symmetry probes the tetraquarks in a manner that is consistent with the large $N_c$ limit of QCD.

   hep-phPRD(2017)·1 citation
8. 08*

   The rapidity dependence of the average transverse momentum in p+p and p+Pb collisions - revisited

   Katarzyna Deja🇵🇱 · Krzysztof Kutak🇵🇱

   We revisit the rapidity dependence of the average transverse momentum $⟨p_T⟩$ in a $pp$ and $pA$ collision, using the high energy factorization (HEF). We update previous predictions for the $⟨p_T⟩$ both in central and forward rapidity region using parton densities following from extended BK and BFKL evolution equations to account for corrections of higher orders as well as one obtained by Sudakov resummation. Furthermore, we demonstrate that in the mid rapidity region the saturation based formalisms predict increase of the transversal momentum while in the forward rapidity region the $⟨p_T(y)⟩$ decreases.

   hep-phPRD(2017)·2 citations
9. 09*

   Improving Fine-tuning in Composite Higgs Models

   Avik Banerjee🇮🇳 · Gautam Bhattacharyya🇮🇳 · Tirtha Sankar Ray🇮🇳

   In this paper we investigate the next-to-minimal composite Higgs model with a SO(6)/SO(5) coset, whose pNGB sector includes a Standard Model singlet in addition to the usual Higgs doublet. The fermions are embedded in the representation 6 of SO(6). We study the region of parameter space of the model where the radiatively generated potential has global minima with both the doublet and the singlet fields developing vacuum expectation values. We investigate the consequences of kinetic and mass mixing between the Higgs and the singlet scalar that arise in this framework. We demonstrate that the ensuing doublet-singlet mixing can provide a handle to accommodate heavier resonances (top-partners) for a given compositeness scale as compared to the minimal composite Higgs model, thus relaxing the tension with the direct LHC bounds. The main phenomenological consequence of this is a sizable deviation of the Higgs couplings from the Standard Model predictions. While the present experimental precision in the measurement of the Higgs couplings still allows for considerable release of this tension, future measurements of the Higgs branching ratios with increased precision would lead to stringent constraints on this setup.

   hep-phPRD(2017)·21 citations
10. 10*

    The Heisenberg-Euler effective action in slowly varying electric field inhomogeneities of Lorentzian shape

    Felix Karbstein🇩🇪

    We use a locally constant field approximation (LCFA) to study the one-loop Heisenberg-Euler effective action in a particular class of slowly varying inhomogeneous electric fields of Lorentzian shape with $0\le d\le 4$ inhomogeneous directions. We show that for these fields, the LCFA of the Heisenberg-Euler effective action can be represented in terms of a single parameter integral, with the constant field effective Lagrangian with rescaled argument as integration kernel. The imaginary part of the Heisenberg-Euler effective action contains information about the instability of the quantum vacuum towards the formation of a state with real electrons and positrons. Here, we in particular focus on the dependence of the instantaneous vacuum decay rate on the dimension $d$ of the field inhomogeneity. Specifically for weak fields, we find an overall parametric suppression of the effect with $(E_0/E_{\mathrm{cr}}{)}^{d/2}$, where $E_0$ is the peak field strength of the inhomogeneity and $E_{\mathrm{cr}}$ the critical electric field strength.

    hep-phhep-thPRD(2017)·17 citations
11. 11*

    Review of Higgs-to-light-Higgs searches at the LHC

    R. Aggleton🇬🇧 · D. Barducci🇮🇹 · N-E. Bomark🇳🇴 · S. Moretti🇬🇧 · C. Shepherd-Themistocleous🇬🇧

    We review the most relevant LHC searches at $\sqrt{s}$ = 8 TeV looking for low mass bosons arising from exotic decay of the Standard Model Higgs and highlighting their impact on both supersymmetric and not supersymmetric Beyond the Standard Model scenarios.

    hep-ph0 citations
12. 12*

    The MSSM without Gluinos; an Effective Field Theory for the Stop Sector

    Jason Aebischer🇨🇭 · Andreas Crivellin🇨🇭 · Christoph Greub🇨🇭 · Youichi Yamada🇯🇵

    In this article we study the MSSM with stops and Higgs scalars much lighter than gluinos and squarks of the first two generations. In this setup, one should use an effective field theory with partial supersymmetry in which the gluino and heavy squarks are integrated out in order to connect SUSY parameters (given at a high scale) to observables in the stop sector. In the construction of this effective theory, valid below the gluino mass scale, we take into account $O({\alpha }_3)$ and $O(Y_{t,b}^2)$ effects and calculate the matching as well as the renormalization group evolution. As a result, the running of the parameters for the stop sector is modified with respect to the full MSSM and SUSY relations between parameters are broken. We show that for some couplings sizable numerical differences exist between the effective field theory approach and the naive calculation based on the MSSM running.

    hep-phEPJC(2017)·11 citations
13. 13*

    Quantum field-theoretical description of neutrino and neutral kaon oscillations

    Igor P. Volobuev🇷🇺

    It is shown that the neutrino and neutral kaon oscillation processes can be consistently described in quantum field theory using only the mass eigenstates of neutrinos and neutral kaons. The distance-dependent and time-dependent parts of the amplitudes of these processes are calculated and the results turn out to be in accord with those of the standard quantum mechanical description of these processes based on the notion of neutrino flavor states and neutral kaon states with definite strangeness. However, the physical picture of the phenomena changes radically: now there are no oscillations of flavor or definite strangeness states, but, instead of it, there is an interference of amplitudes due to different virtual mass eigenstates.

    hep-phhep-thInt.J.Mod.Phys.A(2018)·21 citations
14. 14*

    Charmonium spectrum with a Dirac potential model in the momentum space

    D. Molina🇨🇴 · M. De Sanctis🇨🇴 · C. Fernandez-Ramirez🇲🇽

    We study the charmonium spectrum using a complete one gluon exchange approach based on a phenomenological relativistic $q\bar{q}$ potential model with Dirac spinors in momentum space. We use phenomenological screening factors to include vacuum quantum effects. Our formulation does not rely on nonrelativistic approximations. We fit the lowest-lying charmonia (below the $D\bar{D}$ threshold) and predict the higher-lying resonances of the spectrum. In general, we reproduce the overall structure of the charmonium spectrum and, in particular, we can reasonably describe the $X(3872)$ resonance mass as (mostly) a $c\bar{c}$ state. The numerical values of the free parameters of the model are determined taking into account also the experimental uncertainties of the resonance energies. In this way, we are able to obtain the uncertainties of the theoretical resonance masses and the correlation among the free parameters of the model.

    hep-phnucl-thPRD(2017)·17 citations
15. 15*

    Left-right model with TeV fermionic dark matter and unification

    Triparno Bandyopadhyay (Calcutta Univ.)🇮🇳 · Amitava Raychaudhuri (Calcutta Univ.)🇮🇳

    The ingredients for a model with a TeV right-handed scale, gauge coupling unification, and suitable dark matter candidates lie at the heart of left-right symmetry with broken D-parity. After detailing the contents of such a model, with SU(2)R self-conjugate fermions at the right-handed scale aiding in unification of couplings, we explore its dark matter implications and collider signatures.

    hep-phhep-exPLB(2017)·22 citations
16. 16*

    Fermionic triplet dark matter in an $SO(10)$-inspired left right model

    Carolina Arbeláez🇨🇱 · Martin Hirsch🇪🇸 · Diego Restrepo🇨🇴

    We study a left right (LR) extension of the Standard Model (SM) where the Dark Matter (DM) candidate is composed of a set of fermionic Majorana triplets. The DM is stabilized by a remnant $Z_2$ symmetry from the breaking of the LR group to the SM. Two simple scenarios where the DM particles plus a certain set of extra fields lead to gauge coupling unification with a low LR scale are explored. The constraints from relic density and predictions for direct detection are discussed for both scenarios. The first scenario with a $SU(2{)}_R$ vectorlike fermion triplet contains a DM candidate which is almost unconstrained by current direct detection experiments. The second scenario, with an additional $SU(2{)}_R$ triplet, opens up a scalar portal leading to direct detection constraints which are similar to collider limits for right gauge bosons. The DM parameter space consistent with phenomenological requirements can also lead to successful gauge coupling unification in a $SO(10)$ setup.

    hep-phPRD(2017)·11 citations
17. 17*

    Effects of magnetic field on the plasma evolution in relativistic heavy-ion collisions

    Arpan Das🇮🇳 · Shreyansh S. Dave🇮🇳 · P. S. Saumia🇮🇳 · Ajit M. Srivastava🇮🇳

    Very strong magnetic fields can arise in non-central heavy-ion collisions at ultrarelativistic energies, which may not decay quickly in a conducting plasma. We carry out relativistic magnetohydrodynamics (RMHD) simulations to study the effects of this magnetic field on the evolution of the plasma and on resulting flow fluctuations in the ideal RMHD limit. Our results show that magnetic field leads to enhancement in elliptic flow for small impact parameters while it suppresses it for large impact parameters (which may provide a signal for initial stage magnetic field). Interestingly, we find that magnetic field in localized regions can temporarily increase in time as evolving plasma energy density fluctuations lead to reorganization of magnetic flux. This can have important effects on chiral magnetic effect. Magnetic field has non-trivial effects on the power spectrum of flow fluctuations. For very strong magnetic field case one sees a pattern of even-odd difference in the power spectrum of flow coefficients arising from reflection symmetry about the magnetic field direction if initial state fluctuations are not dominant. We discuss the situation of nontrivial magnetic field configurations arising from collision of deformed nuclei and show that it can lead to anomalous elliptic flow. Special (crossed body-body) configurations of deformed nuclei collision can lead to presence of quadrupolar magnetic field which can have very important effects on the rapidity dependence of transverse expansion (similar to {\it beam focusing} from quadrupole fields in accelerators).

    hep-phnucl-thphysics.plasm-phPRC(2017)·77 citations
18. 18*

    Improved determination of the Higgs mass in the MSSM with heavy superpartners

    Emanuele Bagnaschi🇩🇪 · Javier Pardo Vega🇮🇹 · Pietro Slavich🇫🇷

    We present several advances in the effective field theory calculation of the Higgs mass in MSSM scenarios with heavy superparticles. In particular, we compute the dominant two-loop threshold corrections to the quartic Higgs coupling for generic values of the relevant SUSY-breaking parameters, including all contributions controlled by the strong gauge coupling and by the third-family Yukawa couplings. We also study the effects of a representative subset of dimension-six operators in the effective theory valid below the SUSY scale. Our results will allow for an improved determination of the Higgs mass and of the associated theoretical uncertainty.

    hep-phEPJC(2017)·76 citations
19. 19*

    Do non-relativistic neutrinos oscillate?

    Evgeny Akhmedov🇩🇪

    We study the question of whether oscillations between non-relativistic neutrinos or between relativistic and non-relativistic neutrinos are possible. The issues of neutrino production and propagation coherence and their impact on the above question are discussed in detail. It is demonstrated that no neutrino oscillations can occur when neutrinos that are non-relativistic in the laboratory frame are involved, except in a strongly mass-degenerate case. We also discuss how this analysis depends on the choice of the Lorentz frame. Our results are for the most part in agreement with Hinchliffe's rule.

    hep-phastro-ph.SRhep-exJHEP(2017)·19 citations
20. 20*

    Model-Independent Extraction of $|V_{cb}|$ from $\bar{B}\to D^{\ast }\ell \overline{\nu }$

    Benjamin Grinstein🇺🇸 · Andrew Kobach🇺🇸

    We fit the unfolded data of ${\bar{B}}^0\to D^{\ast +}\ell \overline{\nu }$ from the Belle experiment, where $\ell \equiv e,\mu$, using a method independent of heavy quark symmetry to extrapolate to zero-recoil and extract the value of $|V_{cb}|$. This results in $|V_{cb}|=(41.9_{-1.9}^{+2.0})\times 10^{-3}$, which is robust to changes in the theoretical inputs and very consistent with the value extracted from inclusive semileptonic $B$ decays.

    hep-phPLB(2017)·147 citations
21. 21*

    Thermal spectrum of pseudo-scalar glueballs and Debye screening mass from holography

    Nelson R. F. Braga🇧🇷 · Luiz F. Ferreira🇧🇷

    The finite temperature spectrum of pseudo-scalar glueballs in a plasma is studied using a holographic model. The $0^{-+}$ glueball is represented by a pseudo-scalar (axion) field living in a five dimensional geometry that comes from a solution of Einstein equations for gravity coupled with a dilaton scalar field. The spectral function obtained from the model shows a clear peak corresponding to the quasi-particle ground state. Analysing the variation of the position of the peak with temperature, we describe the thermal behavior of the Debye screening mass of the plasma. As a check of consistency, the zero temperature limit of the model is also investigated. The glueball masses obtained are consistent with previous lattice results.

    ↳ hep-thhep-phEPJC(2017)·6 citations
22. 22*

    Three-body bound states with zero-range interaction in the Bethe-Salpeter approach

    E. Ydrefors🇧🇷 · J. H. Alvarenga Nogueira🇧🇷 · V. Gigante🇧🇷 · T. Frederico🇧🇷 · V.A. Karmanov🇷🇺

    The Bethe-Salpeter equation for three bosons with zero-range interaction is solved for the first time. For comparison the light-front equation is also solved. The input is the two-body scattering length and the outputs are the three-body binding energies, Bethe-Salpeter amplitudes and light-front wave functions. Three different regimes are analyzed: ({\it i}) For weak enough two-body interaction the three-body system is unbound. ({\it ii}) For stronger two-body interaction a three-body bound state appears. It provides an interesting example of a deeply bound Borromean system. ({\it iii}) For even stronger two-body interaction this state becomes unphysical with a negative mass squared. However, another physical (excited) state appears, found previously in light-front calculations. The Bethe-Salpeter approach implicitly incorporates three-body forces of relativistic origin, which are attractive and increase the binding energy.

    ↳ nucl-thhep-phPLB(2017)·15 citations
23. 23*

    Dynamical evolution of critical fluctuations and its observation in heavy ion collisions

    Miki Sakaida🇯🇵 · Masayuki Asakawa🇯🇵 · Hirotsugu Fujii🇯🇵 · Masakiyo Kitazawa🇯🇵

    We study time evolution of critical fluctuations of conserved charges near the QCD critical point in the context of relativistic heavy ion collisions. A stochastic diffusion equation is employed in order to describe the diffusion property of the critical fluctuation arising from the coupling of the order parameter field to conserved charges. We show that the diffusion property gives rise to a possibility of probing the early time fluctuations through the rapidity window dependence of the second-order cumulant and correlation function of conserved charges. It is pointed out that their non-monotonic behaviors as functions of the rapidity interval are robust experimental signals for the existence of the critical enhancement around the QCD critical point.

    ↳ nucl-thhep-phnucl-exPRC(2017)·44 citations
24. 24*

    Inflationary Perturbations in No-Scale Theories

    Alberto Salvio🇨🇭

    We study the inflationary perturbations in general (classically) scale-invariant theories. Such scenario is motivated by the hierarchy problem and provides natural inflationary potentials and dark matter candidates. We analyse in detail all sectors (the scalar, vector and tensor perturbations) giving general formulae for the potentially observable power spectra, as well as for the curvature spectral index $n_s$ and the tensor-to-scalar ratio $r$. We show that the conserved Hamiltonian for all perturbations does not feature negative energies even in the presence of the Weyl-squared term if the appropriate quantization is performed and argue that this term does not lead to phenomenological problems at least in some relevant setups. The general formulae are then applied to a concrete no-scale model, which includes the higgs and a scalar, "the planckion", whose vacuum expectation value generates the Planck mass. Inflation can be triggered by a combination of the planckion and the Starobinsky scalar and we show that no tension with observations is present even in the case of pure planckion-inflation, if the coefficient of the Weyl-squared term is large enough. In general, even quadratic inflation is allowed in this case. Moreover, the Weyl-squared term leads to an isocurvature mode, which currently satisfies the observational bounds, but may be detectable with future experiments.

    ↳ astro-ph.COgr-qchep-phhep-thEPJC(2017)·90 citations
25. 25*

    Solar $\gamma$-rays as a Complementary Probe of Dark Matter

    Chiara Arina🇧🇪 · Mihailo Backović🇧🇪 · Jan Heisig🇩🇪 · Michele Lucente🇧🇪

    We show that observations of solar $\gamma$-rays offer a novel probe of dark matter in scenarios where interactions with the visible sector proceed via a long-lived mediator. As a proof of principle, we demonstrate that there exists a class of models which yield solar $\gamma$-ray fluxes observable with the next generation of $\gamma$-ray telescopes, while being allowed by a variety of current experimental constraints. The parameter space allowed by big bang nucleosynthesis and beam dump experiments naturally leads to mediator lifetimes sufficient to produce observable solar $\gamma$-ray signals. The model allows for solar $\gamma$-ray fluxes up to orders of magnitude larger compared to dwarf spheroidal galaxies, without reaching equilibrium between dark matter annihilation and capture rate. Our results suggest that solar $\gamma$-ray observations are complementary, and in some cases superior, to existing and future dark matter detection efforts.

    ↳ astro-ph.HEhep-phPRD(2017)·61 citations
26. 26*

    Search for Gamma Ray Bursts with the ARGO-YBJ Detector in Shower Mode

    B. Bartoli🇮🇹 · P. Bernardini🇮🇹 · X. J. Bi🇨🇳 · Z. Cao🇨🇳 · S. Catalanotti🇮🇹 · S. Z. Chen · T. L. Chen · S. W. Cui🇨🇳 · B. Z. Dai🇨🇳 · A. D Amone · Danzeng Luobu · I. De Mitri🇮🇹 and 60 other authors

    The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a full coverage air shower array dedicated to gamma ray astronomy and cosmic ray studies. The wide field of view (~ 2 sr) and high duty cycle (> 86%), made ARGO-YBJ suitable to search for short and unexpected gamma ray emissions like gamma ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view. A search for possible emission associated to these GRBs has been made in the two energy ranges 10-100 GeV and 10-1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a time window of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at 99% of confidence level have been evaluated,with values ranging from ~ 10-5 erg cm-2 to ~10-1 erg cm-2.

    ↳ astro-ph.HEhep-phApJ(2017)·19 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.