HEP Phenomenology·hep-ph

Thu·Sep 1, 2016Thursday·September 1, 2016

27 papers—19 primary·8 cross-listed·reconstructed*

01*
Invisible Decays in Higgs Pair Production
Shankha Banerjee🇫🇷 · Brian Batell🇺🇸 · Michael Spannowsky🇬🇧
Observation of Higgs pair production is an important long term objective of the LHC physics program as it will shed light on the scalar potential of the Higgs field and the nature of electroweak symmetry breaking. While numerous studies have examined the impact of new physics on di-Higgs production, little attention has been given to the well-motivated possibility of exotic Higgs decays in this channel. Here we investigate the consequences of exotic invisible Higgs decays in di-Higgs production. We outline a search sensitive to such invisible decays in the $b b ˉ + \neq E_{T}$ channel. We demonstrate that probing invisible branching ratios of order 10 $%$ during the LHC's high-luminosity run will be challenging, but in resonance enhanced di-Higgs production, this final state can become crucial to establish the existence of physics beyond the Standard Model at collider energies. We also briefly discuss the outlook for other exotic Higgs decay modes and the potential to observe such exotic decays in the di-Higgs channel.
hep-phhep-exPRD(2017)·30 citations
02*
Low Scale Inflation at High Energy Colliders and Meson Factories
Joseph Bramante🇺🇸 · Jessica Cook🇺🇸 · Antonio Delgado🇺🇸 · Adam Martin🇺🇸
Inflation occurring at energy densities less than (10 $^{14}$ GeV) $^{4}$ produces tensor perturbations too small to be measured by cosmological surveys. However, we show that it is possible to probe low scale inflation by measuring the mass of the inflaton at low energy experiments. Detection prospects and cosmological constraints are determined for low scale quartic hilltop models of inflation paired with a curvaton field, which imprints the spectrum of scalar perturbations observed in large scale structure and on the cosmic microwave background. With cosmological constraints applied, low scale quartic inflation at energies GeV--PeV, can be mapped to an MeV--TeV mass inflaton resonance, discoverable through a Higgs portal coupling at upcoming collider and meson decay experiments. It is demonstrated that low scale inflatons can have detectably large couplings to Standard Model particles through a Higgs portal, permitting prompt reheating after inflation, without spoiling, through radiative corrections to the inflaton's self-coupling, the necessary flatness of a low scale inflationary potential. A characteristic particle spectrum for a quartic inflaton-curvaton pair is identified: to within an order of magnitude, the mass of the curvaton can be predicted from the mass of the inflaton, and vice-versa. Low scale inflation Higgs portal sensitivity targets are found for experiments like the LHC, SHiP, BEPC, and KEKB.
hep-phastro-ph.COhep-exhep-thPRD(2016)·17 citations
03*
Dark Sectors 2016 Workshop: Community Report
Jim Alexander🇺🇸 · Marco Battaglieri🇮🇹 · Bertrand Echenard🇺🇸 · Rouven Essig🇺🇸 · Matthew Graham🇺🇸 · Eder Izaguirre🇨🇦 · John Jaros🇺🇸 · Gordan Krnjaic🇺🇸 · Jeremy Mardon🇺🇸 · David Morrissey🇨🇦 · Tim Nelson🇺🇸 · Maxim Perelstein🇺🇸 and 192 other authors
This report, based on the Dark Sectors workshop at SLAC in April 2016, summarizes the scientific importance of searches for dark sector dark matter and forces at masses beneath the weak-scale, the status of this broad international field, the important milestones motivating future exploration, and promising experimental opportunities to reach these milestones over the next 5-10 years.
hep-phastro-ph.COhep-exnucl-ex755 citations
04*
Search for sharp and smooth spectral signatures of $μν$ SSM gravitino dark matter with Fermi-LAT
German A. Gomez-Vargas🇨🇱 · Daniel E. Lopez-Fogliani🇦🇷 · Carlos Munoz🇪🇸 · Andres D. Perez🇦🇷 · Roberto Ruiz de Austri🇪🇸
The $μν$ SSM solves the $μ$ problem of supersymmetric models and reproduces neutrino data, simply using couplings with right-handed neutrinos $ν$ 's. Given that these couplings break explicitly $R$ parity, the gravitino is a natural candidate for decaying dark matter in the $μν$ SSM. In this work we carry out a complete analysis of the detection of $μν$ SSM gravitino dark matter through $γ$ -ray observations. In addition to the two-body decay producing a sharp line, we include in the analysis the three-body decays producing a smooth spectral signature. We perform first a deep exploration of the low-energy parameter space of the $μν$ SSM taking into account that neutrino data must be reproduced. Then, we compare the $γ$ -ray fluxes predicted by the model with Fermi-LAT observations. In particular, with the 95 $%$ CL upper limits on the total diffuse extragalactic $γ$ -ray background using 50 months of data, together with the upper limits on line emission from an updated analysis using 69.9 months of data. For standard values of bino and wino masses, gravitinos with masses larger than about 4 GeV, or lifetimes smaller than $1 0^{28}$ s, produce too large fluxes and are excluded as dark matter candidates. However, when limiting scenarios with large and close values of the gaugino masses are considered, the constraints turn out to be less stringent, excluding masses larger than 17 GeV and lifetimes smaller than $4 \times 1 0^{25}$ s.
hep-phastro-ph.HEJCAP(2017)·36 citations
05*
Neutrino masses in the $S U (4)_{L} \otimes U (1)_{X}$ electroweak extension of the standard model
Guillermo Palacio🇨🇴
We study the neutrino mass generation in the $S U (4)_{L} \otimes U (1)_{X}$ electroweak extension of the standard model by considering non-renormalizable dimension five effective operators. It is shown that there exist two topologies for the realizations of such an operator at the tree-level and for one of the three-family models is explore the neutrino phenomenology after extending its particle content with an $S U (4)_{L}$ fermion singlet and a scalar decuplet. Constraints in the available parameters space of the model are partially discussed.
hep-phInt.J.Mod.Phys.A(2016)·9 citations
06*
Probing nuclear gluons with heavy quarks at EIC
E. Chudakov🇺🇸 · D. Higinbotham🇺🇸 · Ch. Hyde🇺🇸 · S. Furletov🇺🇸 · Yu. Furletova🇺🇸 · D. Nguyen🇺🇸 · M. Stratmann🇩🇪 · M. Strikman🇺🇸 · C. Weiss🇺🇸 · R. Yoshida🇺🇸
We explore the feasibility of direct measurements of nuclear gluon densities using heavy-quark production (open charm, beauty) at a future Electron-Ion Collider (EIC). We focus on the regions x > 0.3 (EMC effect) and x ~ 0.05-0.1 (antishadowing), where the nuclear modifications of the gluon density offer insight into non-nucleonic degrees of freedom and the QCD structure of nucleon-nucleon interactions. We describe the charm production rates and momentum distributions in nuclear deep-inelastic scattering (DIS) at large x_B, and comment on the possible methods for charm reconstruction using next-generation detectors at the EIC (pi/K identification, tracking, vertex detection).
hep-phhep-exPoS(2016)·10 citations
07*
QCD monopole and sigma meson coupling
Aiichi Iwazaki🇯🇵
Under the assumption of the Abelian dominance in QCD, we show that chiral condensate is locally present around a QCD monopole. The appearance of the chiral condensate around a GUT monopole was shown in the previous analysis of the Rubakov effect. We apply a similar analysis to the QCD monopole. It follows that the condensation of the monopole carrying the chiral condensate leads to the chiral symmetry breaking as well as quark confinement. To realize the result explicitly, we present a phenomenological linear sigma model coupled with the monopoles, in which the monopole condensation causes the chiral symmetry breaking as well as confinement. The monopoles are assumed to be described by a model of dual superconductor. Because the monopoles couple with mesons, we point out the presence of an observable color singlet monopole coupled with the mesons.
hep-phInt.J.Mod.Phys.A(2017)·3 citations
08*
Phenomenology of pseudotensor mesons and the pseudotensor glueball
Adrian Koenigstein🇩🇪 · Francesco Giacosa🇩🇪
We study the decays of the pseudotensor mesons $[π_{2} (1670), K_{2} (1770), η_{2} (1645), η_{2} (1870)]$ interpreted as the ground-state nonet of $1^{1} D_{2}$ $q ˉ q$ states using interaction Lagrangians which couple them to pseudoscalar, vector, and tensor mesons. While the decays of $π_{2} (1670)$ and $K_{2} (1770)$ can be well described, the decays of the isoscalar states $η_{2} (1645)$ and $η_{2} (1870)$ can be brought in agreement with experimental data only if the mixing angle between nonstrange and strange states is surprisingly large (about $- 4 2^{\circ}$ , similar to the mixing in the pseudoscalar sector, in which the chiral anomaly is active). Such a large mixing angle is however at odd with all other conventional quark-antiquark nonets: if confirmed, a deeper study of its origin will be needed in the future. Moreover, the $q ˉ q$ assignment of pseudotensor states predicts that the ratio $[η_{2} (1870) \to a_{2} (1320) π] / [η_{2} (1870) \to f_{2} (1270) η]$ is about $23.5$ . This value is in agreement with Barberis et al., ( $20.4 \pm 6.6$ ), but disagrees with the recent reanalysis of Anisovich et al., ( $1.7 \pm 0.4$ ). Future experimental studies are necessary to understand this puzzle. If Anisovich's value shall be confirmed, a simple nonet of pseudoscalar mesons cannot be able to describe data (different assignments and/or additional state, such as an hybrid state, will be needed). In the end, we also evaluate the decays of a pseudoscalar glueball into the aforementioned conventional $q ˉ q$ states: a sizable decay into $K_{2}^{*} (1430) K$ and $a_{2} (1230) π$ together with a vanishing decay into pseudoscalar-vector pairs [such as $ρ (770) π$ and $K^{*} (892) K$ ] are expected. This information can be helpful in future studies of glueballs at the ongoing BESIII and at the future PANDA experiments.
hep-phEPJA(2016)·31 citations
09*
Distinguishing between MSSM and NMSSM through $Δ F = 2$ processes
Jacky Kumar🇮🇳 · Michael Paraskevas🇬🇷
We study deviations between MSSM and $Z_{3}$ -invariant NMSSM, with respect to their predictions in $Δ F = 2$ processes. We find that potentially significant effects arise either from the well known double-penguin diagrams, due to the extra scalar NMSSM states, or from neutralino-gluino box contributions, due to the extended neutralino sector. Both are discussed to be effective in the large $tan β$ regime. Enhanced genuine-NMSSM contributions in double penguins are expected for a light singlet spectrum (CP-even,CP-odd), while the magnitude of box effects is primarily controlled through singlino mixing. The latter is found to be typically subleading (but non-negligible) for $λ ≲ 0.5$ , however it can become dominant for $λ \sim O (1)$ . We also study the low $tan β$ regime, where a distinction between MSSM and NMSSM can come instead due to experimental constraints, acting differently on the allowed parameter space of each model. To this end, we incorporate the LHC Run-I limits from $H \to Z Z$ , $A \to h Z$ and $H^{\pm} \to τ ν$ non-observation along with Higgs observables and set (different) upper bounds for new physics contributions in $Δ F = 2$ processes. We find that a $\sim 25%$ contribution in $Δ M_{s (d)}$ is still possible for MFV models, however such a large effect is nowadays severely constrained for the case of MSSM, due to stronger bounds on the charged Higgs masses.
hep-phhep-exJHEP(2016)·7 citations
10*
Gravitational relaxation of electroweak hierarchy problem
Hiroki Matsui🇯🇵 · Yoshio Matsumoto🇯🇵
In the present paper, we discuss gravitational relaxation models for the electroweak hierarchy problem. We show that modified gravity can naturally relax the electroweak hierarchy problem where conformal transformation provides a crucial rule about what modified gravity theories are favored to relax the electroweak hierarchy. The conformal transformation connects different gravitational theories and rescaling the metric changes the dimensional parameters like the Higgs mass or the cosmological constant in different frames drastically. When the electroweak scale is naturally realized by dynamical and running behavior of dilatonic scalar field or scaling parameter, the modified gravity theories can relax the electroweak hierarchy problem. We discuss the theoretical and phenomenological validity of the gravitational relaxation models.
hep-phgr-qchep-thInt.J.Theor.Phys.(2022)·4 citations
11*
Phenomenological aspects of supergravity theories in de Sitter vacua
Rob Knoops🇧🇪
We introduce an $N = 1$ supergravity model based on the gauged shift symmetry of a single chiral multiplet, which can be identified with the string dilaton or a compactification modulus. The model allows for a tunably small and positive value of the cosmological constant. The gravitino mass parameter and the dilaton Vacuum Expectation Value are separately tunable. In a second part we analyze the quantum consistency of these models. Recent work on anomalies in supergravity theories with Fayet-Iliopoulos terms was extended, such that their results can be interpreted from a field-theoretic point of view. We show that for certain values of the parameters the anomaly cancellation conditions are inconsistent with a TeV gravitino mass. In the third part the above model is used as a hidden sector for supersymmetry breaking. In its minimal version, the model leads to tachyonic scalar soft masses. This problem can however be circumvented by the introduction of an extra Polónyi-like hidden sector field, or by allowing for non-canonical kinetic terms for the Standard Model fields, while maintaining the desirable features of the model. The resulting low energy spectrum consists of very light neutralinos, charginos and gluinos, while the squarks remain heavy, with the exception of the stop squark which can be as light as 2 TeV. Finally, we discus possibility that the shift symmetry is identified with known global symmetries of the MSSM. The particular cases where this global symmetry is Baryon minus Lepton number ( $B - L$ ), or $3 B - L$ , which contain the known R-parity or matter parity of the MSSM, are analyzed in great detail. It is shown that the phenomenology is similar to the above case where the MSSM fields are inert, with the exception of the stop squark, which can be as light as $1.5$ TeV.
hep-phhep-th1 citation
12*
Postinflationary vacuum instability and Higgs-inflaton couplings
Kari Enqvist🇫🇮 · Mindaugas Karciauskas🇫🇮 · Oleg Lebedev🇫🇮 · Stanislav Rusak🇫🇮 · Marco Zatta🇫🇮
The Higgs-inflaton coupling plays an important role in the Higgs field dynamics in the early Universe. Even a tiny coupling generated at loop level can have a dramatic effect on the fate of the electroweak vacuum. Such Higgs-inflaton interaction is present both at the trilinear and quartic levels in realistic reheating models. In this work, we examine the Higgs dynamics during the preheating epoch, focusing on the effects of the parametric and tachyonic resonances. We use lattice simulations and other numerical tools in our studies. We find that the resonances can induce large fluctuations of the Higgs field which destabilize the electroweak vacuum. Our considerations thus provide an upper bound on quartic and trilinear interactions between the Higgs and the inflaton. We conclude that there exists a favourable range of the couplings within which the Higgs field is stabilized during both inflation and preheating epochs.
hep-phastro-ph.COJCAP(2016)·87 citations
13*
Probing phase of a scattering amplitude beyond the plane-wave approximation
Dmitry V. Karlovets🇷🇺
Within a plane-wave approach, a number of scattering events in a collision is insensitive to a general phase of a transition amplitude, although this phase is extremely important for a number of problems, especially in hadronic physics. In reality the particles are better described as wave packets, and here we show that the observables grow dependent upon this phase if one lays aside the simplified plane-wave model. We discuss two methods for probing how the Coulomb- and hadronic phases change with a transferred momentum $t$ , either by colliding two beams at a non-vanishing impact-parameter or by employing such novel states as the vortex particles carrying orbital angular momentum or the Airy beams. For electron-electron collision, the phase contribution to a cross section can reach the values higher than $1 0^{- 4} - - 1 0^{- 3}$ for well-focused beams with energies of hundreds of keV.
hep-phquant-phEPL(2016)·15 citations
14*
Minicharged particles search by strong laser pulse-induced vacuum polarization effects
Selym Villalba-Chávez🇩🇪 · Sebastian Meuren🇩🇪 · Carsten Müller🇩🇪
Laser-based searches of the yet unobserved vacuum birefringence might be sensitive for very light hypothetical particles carrying a tiny fraction of the electron charge. We show that, with the help of contemporary techniques, polarimetric investigations driven by an optical laser pulse of moderate intensity might allow for excluding regions of the parameter space of these particle candidates which have not been discarded so far by laboratory measurement data. Particular attention is paid to the role of a Gaussian wave profile. It is argued that, at energy regimes in which the vacuum becomes dichroic due to these minicharges, the transmission probability of a probe beam through an analyzer set crossed to the initial polarization direction will depend on both the induced ellipticity as well as the rotation of the initial polarization plane. The weak and strong field regimes, relative to the attributes of these minicharged particles, and the relevance of the polarization of the strong field are investigated.
hep-phPLB(2016)·14 citations
15*
Quantum corrections to inflation: the importance of RG-running and choosing the optimal RG-scale
Matti Herranen🇩🇰 · Andreas Hohenegger🇩🇪 · Asgeir Osland🇳🇴 · Anders Tranberg🇳🇴
We demonstrate the importance of correctly implementing RG-running and choosing the RG-scale when calculating quantum corrections to inflaton dynamics. We show that such corrections are negligible for single-field inflation, in the sense of not altering the viable region in the $n_{s} - r$ plane, when imposing Planck constraints on $A_{s}$ . Surprisingly, this also applies, in a nontrivial way, for an inflaton coupled to additional spectator degrees of freedom. The result relies on choosing the renormalisation scale (pseudo-)optimally, thereby avoiding unphysical large logarithmic corrections to the Friedmann equations and large running of the couplings. We find that the viable range of parameters of the potential is altered relative to the classical limit, and we find an upper limit of $g ≃ 1 0^{- 4}$ on the value of the inflaton-spectator portal coupling still allowing for inflation. And an upper limit of $g ≃ 1 0^{- 5}$ for inflation to correctly reproduce the scalar amplitude of fluctuations $A_{s}$ .
hep-phPRD(2017)·17 citations
16*
When the C in CP does not matter: anatomy of order-4 CP eigenstates and their Yukawa interactions
Alfredo Aranda🇲🇽 · Igor P. Ivanov🇵🇹 · Enrique Jiménez🇲🇽
We explore the origin and Yukawa interactions of the scalars with peculiar CP-properties which were recently found in a multi-Higgs model based on an order-4 CP symmetry. We relate the existence of such scalars to the enhanced freedom of defining CP, even beyond the well-known generalized CP symmetries, which arises in models with several zero-charge scalar fields. We also show that despite possessing exotic CP quantum numbers, these scalars do not have to be inert: they can have CP-conserving Yukawa interactions provided the CP acts on fermions by also mixing generations. This paper focuses on formal aspects---exposed in a pedagogical manner---and includes a brief discussion of possible phenomenological consequences.
hep-phPRD(2017)·20 citations
17*
Minimal Spin-3/2 Dark Matter in a simple $s$ -channel model
Mohammed Omer Khojali🇿🇦 · Ashok Goyal🇿🇦 · Mukesh Kumar🇿🇦 · Alan S. Cornell🇿🇦
We consider a spin~-~3/2 fermionic dark matter candidate (DM) interacting with Standard Model fermions through a vector mediator in the $s$ -channel. We find that for pure vector couplings almost the entire parameter space of the DM and mediator mass consistent with the observed relic density is ruled out by the direct detection observations through DM-nucleon elastic scattering cross-sections. In contrast, for pure axial-vector coupling, the most stringent constraints are obtained from mono-jet searches at the Large Hadron Collider.
hep-phEPJC(2017)·14 citations
18*
Domestic Axion
Gia Dvali🇩🇪 · Lena Funcke🇩🇪
We attempt to identify a phenomenologically viable solution to the strong $C P$ problem in which the axion is composed entirely out of Standard Model fermion species. The axion consists predominantly of the $η^{'}$ meson with a minuscule admixture of a pseudoscalar bilinear composite of neutrinos, $η_{ν}$ . The Peccei-Quinn symmetry is an axial symmetry that acts on the up quark and the neutrino species and is spontaneously broken by the QCD condensate of quarks as well as the condensate of neutrinos triggered by chiral gravitational anomaly. The up-quark mass is spontaneously generated by the neutrino condensate which plays the role of an additional composite Higgs doublet with the compositeness scale of the order of the neutrino masses. Such a scenario is highly economical: it solves the strong $C P$ problem, generates the up-quark and neutrino masses from fermion condensates and simultaneously protects the axion shift symmetry against gravitational anomaly. The phenomenology is different from the standard hidden axion case. One of the experimental signatures is the existence of a gravity-competing isotope-dependent attractive force among nucleons at (sub)micron distances.
hep-phgr-qchep-th32 citations
19*
Analysis of the charmed mesons $D_{1}^{*} (2680)$ , $D_{3}^{*} (2760)$ and $D_{2}^{*} (3000)$
Guo Liang Yu🇨🇳 · Zhi Gang Wang🇨🇳 · Zhen Yu Li🇨🇳
In this work, we systematically study the strong decay behaviors of the charmed mesons $D_{1}^{*} (2680)$ , $D_{3}^{*} (2760)$ and $D_{2}^{*} (3000)$ reported by the LHCb collaboration. By comparing the masses and the decay properties with the results of the experiment, we assigned these newly observed mesons as the $2 S \frac{1}{2} 1^{-}$ , $1 D \frac{5}{2} 3^{-}$ and $1 F \frac{5}{2} 2^{+}$ states respectively. As a byproduct, we also study the strong decays of the unobserved $2 P \frac{3}{2} 2^{+}$ and $2 F \frac{5}{2} 2^{+}$ charmed mesons, which is helpful to the future experiments in searching for these charmed mesons.
hep-phPRD(2016)·17 citations
20*
Anomalous transport from holography: Part I
Yanyan Bu🇮🇱 · Michael Lublinsky🇮🇱 · Amir Sharon🇮🇱
We revisit the transport properties induced by the chiral anomaly in a charged plasma holographically dual to anomalous $U (1)_{V} \times U (1)_{A}$ Maxwell theory in Schwarzschild- $A d S_{5}$ . Off-shell constitutive relations for vector and axial currents are derived using various approximations generalising most of known in the literature anomaly-induced phenomena and revealing some new ones. In a weak external field approximation, the constitutive relations have all-order derivatives resummed into six momenta-dependent transport coefficient functions: the diffusion, the electric/magnetic conductivity, and three anomaly induced functions. The latter generalise the chiral magnetic and chiral separation effects. Nonlinear transport is studied assuming presence of constant background external fields. The chiral magnetic effect, including all order nonlinearity in magnetic field, is proven to be exact when the magnetic field is the only external field that is turned on. Non-linear corrections to the constitutive relations due to electric and axial external fields are computed.
↳ hep-thcond-mat.mes-hallhep-phnucl-thJHEP(2016)·17 citations
21*
Two-Particle Correlations in Heavy-Light Ion Collisions
Douglas E. Wertepny🇺🇸
We study the initial, high-energy scatterings in heavy ion collisions using the saturation/Color Glass Condensate framework. We focus on two-particle long-range rapidity correlations which are modeled as two-gluon correlations. We calculate the two-gluon production cross section using the saturation framework in the heavy-light ion regime, including all-order saturation effects in the heavy nucleus while considering only two-orders in the light ion. The two-gluon production cross section generates four types of long-range in rapidity correlations: (i) geometric correlations, (ii) Hanbury Brown and Twiss (HBT) like correlations accompanied by a back-to-back maximum, (iii) near-side correlations, and (iv) away-side azimuthal correlations. The geometric correlations (i) are due to the fact that nucleons are correlated by simply being confined within the same nucleus. Correlations (iii) and (iv) have exactly the same amplitudes along with azimuthal and rapidity shapes: one centered around $Δ ϕ = 0$ and the other one centered around $Δ ϕ = π$ (here $Δ ϕ$ is the azimuthal angle between the two produced gluons). The geometry dependence of the correlation function leads to stronger azimuthal near- and away-side correlations in the tip-on-tip U+U collisions than in the side-on-side U+U collisions, an exactly opposite behavior from the correlations generated by the elliptic flow of the quark-gluon plasma: a study of azimuthal correlations in the U+U collisions may help to disentangle the two sources of correlations. Finally we rewrite our result for the two-gluon production cross-section in a $k_{T}$ -factorized form resulting in an expression involving a convolution of one- and two-gluon Wigner distributions over the transverse momenta and impact parameters. This differs from the $k_{T}$ -factorized forms used in the literature.
↳ nucl-thhep-phnucl-ex1 citation
22*
Echoes of ECOs: gravitational-wave signatures of exotic compact objects and of quantum corrections at the horizon scale
Vitor Cardoso🇵🇹 · Seth Hopper🇵🇹 · Caio F. B. Macedo🇵🇹 · Carlos Palenzuela🇪🇸 · Paolo Pani🇮🇹
Gravitational waves from binary coalescences provide one of the cleanest signatures of the nature of compact objects. It has been recently argued that the post-merger ringdown waveform of exotic ultracompact objects is initially identical to that of a black-hole, and that putative corrections at the horizon scale will appear as secondary pulses after the main burst of radiation. Here we extend this analysis in three important directions: (i) we show that this result applies to a large class of exotic compact objects with a photon sphere for generic orbits in the test-particle limit; (ii) we investigate the late-time ringdown in more detail, showing that it is universally characterized by a modulated and distorted train of "echoes" of the modes of vibration associated with the photon sphere; (iii) we study for the first time equal-mass, head-on collisions of two ultracompact boson stars and compare their gravitational-wave signal to that produced by a pair of black-holes. If the initial objects are compact enough as to mimic a binary black-hole collision up to the merger, the final object exceeds the maximum mass for boson stars and collapses to a black-hole. This suggests that - in some configurations - the coalescence of compact boson stars might be almost indistinguishable from that of black-holes. On the other hand, generic configurations display peculiar signatures that can be searched for in gravitational-wave data as smoking guns of exotic compact objects.
↳ gr-qcastro-ph.HEhep-phhep-thPRD(2016)·634 citations
23*
How the green light was given for gravitational wave search
C Denson Hill🇺🇸 · Pawel Nurowski🇵🇱
The recent detection of gravitational waves by the LIGO/VIRGO team is an incredibly impressive achievement of experimental physics. It is also a tremendous success of the theory of General Relativity. It confirms the existence of black holes; shows that binary black holes exist; that they may collide and that during the merging process gravitational waves are produced. These are all predictions of General Relativity theory in its fully nonlinear regime. The existence of gravitational waves was predicted by Albert Einstein in 1916 within the framework of linearized Einstein theory. Contrary to common belief, even the very \emph{definition} of a gravitational wave in the fully nonlinear Einstein theory was provided only after Einstein's death. Actually, Einstein had arguments against the existence of nonlinear gravitational waves (they were erroneous but he did not accept this), which virtually stopped development of the subject until the mid 1950s. This is what we refer to as the \emph{Red Light} for gravitational waves research. In the following years, the theme was picked up again and studied vigorously by various experts, mainly Herman Bondi, Felix Pirani, Ivor Robinson and Andrzej Trautman, where the theoretical obstacles concerning gravitational wave existence were successfully overcome, thus giving the `Green Light' for experimentalists to start designing detectors, culminating in the recent LIGO/VIRGO discovery. In this note we tell the story of this theoretical breakthrough. Particular attention is given to the fundamental 1958 papers of Trautman, which seem to be lesser known outside the circle of General Relativity experts. A more detailed technical description of these 2 papers is given in the Appendix.
↳ physics.hist-phastro-ph.COgr-qchep-ph+111 citations
24*
Search for Dark Matter with LHC proton Beam Dump
Ashok Kumar🇮🇳 · Archana Sharma🇨🇭
Dark Matter (DM) comprising particles in the mass range of a few MeV to GeV is waiting to be explored, given the many theoretical models accommodating cosmological abundance. We hereby propose an experiment with the LHC proton beam of 7 TeV striking onto the beam dump target, emitting neutrinos and possibly, Dark Matter candidates. This experiment would also permit to observe signatures involving elastic and inelastic processes involving DM candidates, electrons and strongly interacting particles present in nuclei of the dump target. There will be residual neutrino background present in each of these signatures, hence the proposed experimental detector sub-systems would be such that they would involve as final states, elastically or inelasticity scattered, standard model particles. The bump or the excess in the tail of the kinematic distributions will eventually give us glimpse of presence of new particles which could possibly be Dark Matter candidates. Given the parameters of the LHC machine, the sensitivity of such an experiment is unique in the energy region it is supposed to exploit.
↳ hep-exhep-phphysics.ins-det0 citations
25*
K-Long Facility for JLab and its Scientific Potential
Igor I. Strakovsky🇺🇸
Our main interest in creating a secondary high-quality KL-beam is to investigate hyperon spectroscopy through both formation and production processes. We propose to study two-body reactions induced by the KL-beam on the proton target. The experiment should measure both differential cross sections and self-analyzed polarizations of the produced $Λ$ -, $Σ$ -, and $Ξ$ -hyperons using the GlueX detector at the Jefferson Lab Hall D. New data will greatly constrain partial-wave analysis and reduce model-dependent uncertainties in the extraction of strange resonance properties, providing a new benchmark for comparisons with QCD-inspired models and LQCD calculations. The measurements will span c.m. $cos θ$ from -0.95 to 0.95 in c.m. range above W = 1490MeV and up to 4000 MeV.
↳ nucl-exhep-exhep-phnucl-thEPJ Web Conf.(2016)·2 citations
26*
Pomeron - Odderon interactions in a reggeon field theory
J. Bartels🇩🇪 · C. Contreras🇨🇱 · G. P. Vacca🇮🇹
In this paper we extend our recent non perturbative functional renormalization group analysis of Reggeon Field Theory to the interactions of Pomeron and Odderon fields. We establish the existence of a fixed point and its universal properties, which exhibits a novel symmetry structure in the space of Odderon-Pomeron interactions. As in our previous analysis, this part of our program aims at the investigation of the IR limit of reggeon field theory (the limit of high energies and large transverse distances). It should be seen in the broader context of trying to connect the nonperturbative infrared region (large transverse distances) with the UV region of small transverse distances where the high energy limit of perturbative QCD applies.
↳ hep-thhep-phPRD(2017)·19 citations
27*
Analytic results for the Tsallis thermodynamic variables
Trambak Bhattacharyya🇿🇦 · Jean Cleymans🇿🇦 · Sylvain Mogliacci🇿🇦
We analytically investigate the thermodynamic variables of a hot and dense system, in the framework of the Tsallis non-extensive classical statistics. After a brief review, we start by recalling the corresponding massless limits for all the thermodynamic variables. We then present the detail of calculation for the exact massive result regarding the pressure -- valid for all values of the $q$ -parameter -- as well as the Tsallis $T$ -, $μ$ - and $m$ - parameters, the former characterizing the non-extensivity of the system. The results for other thermodynamic variables, in the massive case, readily follow from appropriate differentiations of the pressure, for which we provide the necessary formulas. For the convenience of the reader, we tabulate all of our results. A special emphasis is put on the method used in order to perform these computations, which happens to reduce cumbersome momentum integrals into simpler ones. Numerical consistency between our analytic results and the corresponding usual numerical integrals are found to be perfectly consistent. Finally, it should be noted that our findings substantially simplify calculations within the Tsallis framework. The latter being extensively used in various different fields of science as for example, but not limited to, high-energy nucleus collisions, we hope to enlighten a number of possible applications.
↳ cond-mat.stat-mechhep-phPRD(2016)·35 citations

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