Thu·Oct 8, 2015Thursday·October 8, 2015

1. 01*

   Updating neutrino magnetic moment constraints

   B. C. Canas🇲🇽 · O. G. Miranda🇲🇽 · A. Parada🇨🇴 · M. Tortola🇪🇸 · J. W. F. Valle🇪🇸

   In this paper we provide an updated analysis of the neutrino magnetic moments (NMMs), discussing both the constraints on the magnitudes of the three transition moments Lambda_i as well as the role of the CP violating phases present both in the mixing matrix and in the NMM matrix. The scattering of solar neutrinos off electrons in Borexino provides the most stringent restrictions, due to its robust statistics and the low energies observed, below 1 MeV. Our new limit on the effective neutrino magnetic moment which follows from the most recent Borexino data is 3.1 x 10^-11 mu_B at 90% C.L. This corresponds to the individual transition magnetic moment constraints: |Lambda_1| < 5.6 x10^-11 mu_B, |Lambda_2| < 4.0 x 10^-11 mu_B, and |Lambda_3| < 3.1 x 10^-11 mu_B (90% C.L.), irrespective of any complex phase. Indeed, the incoherent admixture of neutrino mass eigenstates present in the solar flux makes Borexino insensitive to the Majorana phases present in the NMM matrix. For this reason we also provide a global analysis including the case of reactor and accelerator neutrino sources, and presenting the resulting constraints for different values of the relevant CP phases. Improved reactor and accelerator neutrino experiments will be needed in order to underpin the full profile of the neutrino electromagnetic properties.

   hep-phhep-exPLB(2016)·71 citations
2. 02*

   Inclusive Higgs Production at Large Transverse Momentum

   Eric Braaten🇺🇸 · Hong Zhang🇺🇸

   We present a factorization formula for the inclusive production of the Higgs boson at large transverse momentum $P_T$ that includes all terms with the leading power of $1/P_T^2$. The cross section is factorized into convolutions of parton distributions, infrared-safe hard-scattering cross sections for producing a parton, and fragmentation functions that give the distribution of the longitudinal momentum fraction of the Higgs relative to the fragmenting parton. The infrared-safe cross sections and the fragmentation functions are perturbatively calculable. The most important fragmentation functions are those for which the fragmenting parton is the top quark, gluon, $W$, $Z$, and the Higgs itself. We calculate the fragmentation functions at leading order in the Standard Model coupling constants. The factorization formula enables the resummation of large logarithms of $P_T/M_H$ due to final-state radiation by integrating evolution equations for the fragmentation functions. By comparing the cross section for the process $q\bar{q}\to Ht\bar{t}$ from the leading-power factorization formula at leading order in the coupling constants with the complete leading-order cross section, we infer that the error in the factorization formula decreases to less than 5\% for $P_T>600$ GeV at a future $100$ TeV collider.

   hep-phPRD(2016)·9 citations
3. 03*

   Determination of the $WW$ polarization fractions in $pp\to W^{\pm }{W}^{\pm }jj$ using a deep machine learning technique

   Jacob Searcy🇺🇸 · Lillian Huang🇺🇸 · Marc-André Pleier🇺🇸 · Junjie Zhu🇺🇸

   The unitarization of the longitudinal vector boson scattering (VBS) cross section by the Higgs boson is a fundamental prediction of the Standard Model which has not been experimentally verified. One of the most promising ways to measure VBS uses events containing two leptonically-decaying same-electric-charge $W$ bosons produced in association with two jets. However, the angular distributions of the leptons in the $W$ boson rest frame, which are commonly used to fit polarization fractions, are not readily available in this process due to the presence of two neutrinos in the final state. In this paper we present a method to alleviate this problem by using a deep machine learning technique to recover these angular distributions from measurable event kinematics and demonstrate how the longitudinal-longitudinal scattering fraction could be studied. We show that this method doubles the expected sensitivity when compared to previous proposals.

   hep-phhep-exPRD(2016)·45 citations
4. 04*

   An ultralight pseudoscalar boson

   Jihn E. Kim🇰🇷 · David J. E. Marsh🇬🇧

   Using a fundamental discrete symmetry, ${\mathbb{Z}}_N$, we construct a two-axion model with the QCD axion solving the strong-$CP$ problem, and an ultralight axion (ULA) with $m_{\mathrm{ULA}}\approx 10^{-22}\text{ eV}$ providing the dominant form of dark matter (DM). The ULA is light enough to be detectable in cosmology from its imprints on structure formation, and may resolve the small-scale problems of cold DM. The necessary relative DM abundances occur without fine tuning in constructions with decay constants $f_{\mathrm{ULA}}\sim 10^{17}\text{ GeV}$, and $f_{\mathrm{QCD}}\sim 10^{11}\text{ GeV}$. An example model achieving this has $N=24$, and we construct a range of other possibilities. We compute the ULA couplings to the Standard Model, and discuss prospects for direct detection. The QCD axion may be detectable in standard experiments through the $\vec{E}\cdot \vec{B}$ and $G\tilde{G}$ couplings. In the simplest models, however, the ULA has identically zero coupling to both $G\tilde{G}$ of QCD and $\vec{E}\cdot \vec{B}$ of electromagnetism due to vanishing electromagnetic and color anomalies. The ULA couples to fermions with strength $g\propto 1/f_{\mathrm{ULA}}$. This coupling causes spin precession of nucleons and electrons with respect to the DM wind with period $t\sim$months. Current limits do not exclude the predicted coupling strength, and our model is within reach of the CASPEr-Wind experiment, using nuclear magnetic resonance.

   hep-phastro-ph.COhep-thPRD(2016)·89 citations
5. 05*

   Pseudo-scalar Form Factors at Three Loops in QCD

   Taushif Ahmed🇮🇳 · Thomas Gehrmann🇨🇭 · Prakash Mathews🇮🇳 · Narayan Rana🇮🇳 · V. Ravindran🇮🇳

   The coupling of a pseudo-scalar Higgs boson to gluons is mediated through a heavy quark loop. In the limit of large quark mass, it is described by an effective Lagrangian that only admits light degrees of freedom. In this effective theory, we compute the three-loop massless QCD corrections to the form factor that describes the coupling of a pseudo-scalar Higgs boson to gluons. Due to the axial anomaly, the pseudo-scalar operator for the gluonic field strength mixes with the divergence of the axial vector current. Working in dimensional regularization and using the 't~Hooft-Veltman prescription for the axial vector current, we compute the three-loop pseudo-scalar form factors for massless quarks and gluons. Using the universal infrared factorization properties, we independently derive the three-loop operator mixing and finite operator renormalisation from the renormalisation group equation for the form factors, thereby confirming recent results in the operator product expansion. The finite part of the three-loop form factor is an important ingredient to the precise prediction of the pseudo-scalar Higgs boson production cross section at hadron colliders. We discuss potential applications and derive the hard matching coefficient in soft-collinear effective theory.

   hep-phhep-exJHEP(2015)·47 citations
6. 06*

   Dalitz plot distributions in presence of triangle singularities

   Adam P. Szczepaniak🇺🇸

   We discuss properties of three-particle Dalitz distributions in coupled channel systems in presence of triangle singularities. The single channel case was discussed long ago where it was found that as a consequence of unitarity, effects of a triangle singularity seen in the Dalitz plot are not seen in Dalitz plot projections. In the coupled channel case we find the same is true for the sum of intensities of all interacting channels. Unlike the single channel case, however, triangle singularities do remain visible in Dalitz plot projections of individual channels.

   hep-phPLB(2016)·61 citations
7. 07*

   Looking for a hidden-charm pentaquark state with strangeness $S=-1$ from ${\Xi }_b^{-}$ decay into $J/\psi K^{-}\Lambda$

   Hua-Xing Chen🇨🇳 · Li-Sheng Geng🇨🇳 · Wei-Hong Liang🇨🇳 · Eulogio Oset🇪🇸 · En Wang🇨🇳 · Ju-Jun Xie🇨🇳

   Assuming that the recently observed hidden-charm pentaquark state, $P_c(4450)$, is of molecular nature as predicted in the unitary approach, we propose to study the decay of ${\Xi }_b^{-}\to J/\psi K^{-}\Lambda$ to search for the strangeness counterpart of the $P_c(4450)$. There are three ingredients in the decay mechanism: the weak decay mechanism, the hadronization mechanism, and the finite state interactions in the meson-baryon system of strangeness $S=-2$ and isospin $I=1/2$ and of the $J/\psi \Lambda$. All these have been tested extensively. As a result, we provide a genuine prediction of the differential cross section where a strangeness hidden-charm pentaquark state, the counterpart of the $P_c(4450)$, can be clearly seen. The decay rate is estimated to be of similar magnitude as the ${\Lambda }_b^0\to J/\psi K^{-}p$ observed by the LHCb collaboration.

   hep-phhep-exnucl-exnucl-thPRC(2016)·123 citations
8. 08*

   Fragmentation fractions of two-body b-baryon decays

   Y.K. Hsiao🇨🇳 · P.Y. Lin🇹🇼 · L.W. Luo🇹🇼 · C.Q. Geng🇨🇳

   We study the fragmentation fractions $(f_{{\mathbf{B}}_b})$ of the $b$-quark to b-baryons (${\mathbf{B}}_b$). By the assumption of $f_{{\Lambda }_b}/(f_u+f_d)=0.25\pm 0.15$ in accordance with the measurements by LEP, CDF and LHCb Collaborations, we estimate that $f_{{\Lambda }_b}=0.175\pm 0.106$ and $f_{{\Xi }_b^{-,0}}=0.019\pm 0.013$. From these fragmentation fractions, we derive $\mathcal{B}({\Lambda }_b\to J/\psi \Lambda )=(3.3\pm 2.1)\times 10^{-4}$, $\mathcal{B}({\Xi }_b^{-}\to J/\psi {\Xi }^{-})=(5.3\pm 3.9)\times 10^{-4}$ and $\mathcal{B}({\Omega }_b^{-}\to J/\psi {\Omega }^{-})>1.9\times 10^{-5}$. The predictions of $\mathcal{B}({\Lambda }_b\to J/\psi \Lambda )$ and $\mathcal{B}({\Xi }_b^{-}\to J/\psi {\Xi }^{-})$ clearly enable us to test the theoretical models, such as the QCD factorization approach in the $b$-baryon decays.

   hep-phhep-exPLB(2015)·34 citations
9. 09*

   Towards unification of GUT families

   Jihn E. Kim🇰🇷

   I discuss the mere 5 % of atoms in the cosmic energy pie. It is basically the chiral matter problem. Then, I review the chiral matter problem from a grand unification (GUT) point of view, and point out that anti-SU(N), easily implementable in string compactification, is a possibility. Here `anti-' means that the GUT group breaking is through the anti-symmetric tensor field(s), e.g. <\Phi^{[AB]}>= <\Phi_{[AB]}>. We argued for an anti-SU(7) [= SU(7) x U(1)] families-unification model from a Z(12-I) orbifold compactification. The Z(12-I) orbifold is briefly discussed and the multiplicity 2 in the T3 twisted sector is the key obtaining three chiral families. Yukawa coupling structure is shown to be promising. A numerical study shows that the anti-SU(7) model satisfies the CKM fit. It is shown that the doublet-triplet splitting is obtained naturally, where the dominant process for proton decay is by the exchange of GUT scale gauge bosons such that proton to pi-zero plus positron is the dominant channel.

   hep-phhep-thPoS(2015)·2 citations
10. 10*

    Monoenergetic Neutrinos From Dark Matter Annihilation: Issues of Exposure

    Jason Kumar🇺🇸

    We consider searches for dark matter annihilation in the Sun resulting in monoenergetic neutrinos, produced either directly or through the decay of stopped pions and kaons. We find that this strategy is very successful at increasing the signal-to-background ratio, but that current experiments may be signal limited. We discuss the exposures need to fully exploit this search strategy.

    hep-phastro-ph.COAIP Conf.Proc.(2016)·0 citations
11. 11*

    Accessing transversity GPDs in neutrino-production of a charmed meson

    B. Pire🇫🇷 · L. Szymanowski🇵🇱

    We demonstrate that the transversity chiral odd generalized parton distributions can be accessed through the azimuthal dependence of the nu N -> l D N' or nubar N -> l D N' differential cross sections, in the framework of the colinear QCD approach, where GPDs factorize from perturbatively calculable coefficient functions calculated up to order mc/Q.

    hep-phhep-exnucl-exnucl-thActa Phys.Polon.Supp.(2015)·6 citations
12. 12*

    Natural SUSY: LHC and Dark Matter direct detection experiments interplay

    D. Barducci🇫🇷 · A. Belyaev🇬🇧 · A. Bharucha🇫🇷 · W. Porod🇩🇪 · V. Sanz🇬🇧

    Natural SUSY scenarios with a low value of the $\mu$ parameter, are characterised by a higgsino-like dark matter candidate, and a compressed spectrum for the lightest higgsinos. We explore the prospects for probing this scenario at the 13 TeV stage of the LHC via monojet searches, with various integrated luminosity options, and demonstrate how these results are affect by different assumptions on the achievable level of control on the experimental systematic uncertainties. The complementarity between collider and direct detection experiments (present and future) is also highlighted.

    hep-phPoS(2015)·0 citations
13. 13*

    Roots of unity and lepton mixing patterns from finite flavour symmetries

    R.M. Fonseca🇪🇸 · W. Grimus🇦🇹

    The classification of lepton mixing matrices from finite residual symmetries is reviewed, with emphasis on the role of vanishing sums of roots of unity for the solution of this problem.

    hep-phActa Phys.Polon.B(2015)·2 citations
14. 14*

    Associated production of a top pair and a Higgs boson beyond NLO

    Alessandro Broggio🇨🇭 · Andrea Ferroglia🇺🇸 · Ben D. Pecjak🇬🇧 · Adrian Signer🇨🇭 · Li Lin Yang🇨🇳

    We consider soft gluon emission corrections to the production of a top-antitop pair in association with a Higgs boson at hadron colliders. In particular, we present a soft-gluon resummation formula for this production process and gather all elements needed to evaluate it at next-to-next-to-leading logarithmic order. We employ these results to obtain approximate next-to-next-to-leading order (NNLO) formulas, and implement them in a bespoke parton-level Monte Carlo program which can be used to calculate the total cross section along with arbitrary differential distributions. We use this tool to study the phenomenological impact of the approximate NNLO corrections, finding that they increase the total cross section and the differential distributions which we evaluated in this work.

    hep-phJHEP(2016)·89 citations
15. 15*

    Instabilities in relativistic two-component (super)fluids

    Alexander Haber🇦🇹 · Andreas Schmitt🇦🇹 · Stephan Stetina🇦🇹

    We study two-fluid systems with nonzero fluid velocities and compute their sound modes, which indicate various instabilities. For the case of two zero-temperature superfluids we employ a microscopic field-theoretical model of two coupled bosonic fields, including an entrainment coupling and a non-entrainment coupling. We analyse the onset of the various instabilities systematically and point out that the dynamical two-stream instability can only occur beyond Landau's critical velocity, i.e., in an already energetically unstable regime. A qualitative difference is found for the case of two normal fluids, where certain transverse modes suffer a two-stream instability in an energetically stable regime if there is entrainment between the fluids. Since we work in a fully relativistic setup, our results are very general and of potential relevance for (super)fluids in neutron stars and, in the non-relativistic limit of our results, in the laboratory.

    hep-phastro-ph.SRcond-mat.quant-gasPRD(2016)·27 citations
16. 16*

    Interpreting LHC searches for new physics with SModelS

    Ursula Laa🇫🇷

    ATLAS and CMS have performed a large number of searches for physics beyond the Standard Model (BSM). The results are typically presented in the context of Simplified Model Spectra (SMS), containing only a few new particles with fixed decay branching ratios, yielding generic upper limits on the cross section as a function of particle masses. The interpretation of these limits within realistic BSM scenarios is non-trivial and best done by automated computational tools. To this end we have developed SModelS, a public tool that can test any given BSM model with a ${\mathbb{Z}}_2$ symmetry by decomposing it into its SMS components and confronting them with a large database of SMS results. This allows to easily evaluate the main LHC constraints on the model. Additionally, SModelS returns information on important signatures that are not covered by the existing SMS results. This may be used to improve the coverage of BSM searches and SMS interpretations. We present the working principle of SModelS, in particular the decomposition procedure, the database and matching of applicable experimental results. Moreover, we present applications of SModelS to different models: the MSSM, a model with a sneutrino as the lightest supersymmetric particle and the UMSSM. These results illustrate how SModelS can be used to identify important constraints, untested regions and interesting new signatures.

    hep-phhep-exPoS(2015)·1 citation
17. 17*

    Axions/Axion like particles and the CMB asymmetric dipole

    Qiaoli Yang🇨🇳

    Axions and axion like particles are very attractive dark matter candidates. In this review, we briefly investigate how the cosmological observations reveal the existence of dark matter and some unique properties of axions/axion like particles which make them more interesting.

    hep-phastro-ph.COInt.J.Mod.Phys.D(2015)·0 citations
18. 18*

    AdS/CFT and the Little Hierarchy Problem

    Xi Dong🇺🇸 · Daniel Z. Freedman🇺🇸 · Yue Zhao🇺🇸

    The AdS/CFT correspondence is applied to a close analogue of the little hierarchy problem in $Ad{S}_{d+1}$, $d\ge 3$. The new mechanism requires a Maxwell field that gauges a $U(1{)}_R$ symmetry in a bulk supergravity theory with a negative cosmological constant. Supersymmetry is explicitly broken by a non-local boundary term with dimensionless coupling $h$. Non-locality appears to cause no pathology, and the SUSY breaking deformation engendered is exactly marginal. SUSY breaking effects in the bulk are computed using the $U(1)$ Ward identity. Conformal dimensions and thus masses of scalar and spinor partners are split simply because they carry different R-charges. However SUSY breaking effects cancel to all orders for R-neutral fields, even in diagrams with internal R-charged loops. SUSY breaking corrections can be summed to all orders in $h$. Diagrams involving graviton loops do not introduce any further SUSY breaking corrections. A possible scenario for a flat spacetime limit is outlined.

    ↳ hep-thhep-ph5 citations
19. 19*

    Nonperturbative results for two-index conformal windows

    Georg Bergner🇨🇭 · Thomas A. Ryttov🇩🇰 · Francesco Sannino🇩🇰

    Via large and small $N_c$ relations we derive nonperturbative results about the conformal window of two-index theories. Using Schwinger-Dyson methods as well as four-loops results we estimate subleading corrections and show that naive large number of colors extrapolations are unreliable when $N_c$ is less than about six. Nevertheless useful nonperturbative inequalities for the size of the conformal windows, for any number of colors, can be derived. By further observing that the adjoint conformal window is independent of the number of colors we argue, among other things, that: The large $N_c$ two-index conformal window is twice the conformal window of the adjoint representation (which can be determined at small $N_c$) expressed in terms of Dirac fermions; Lattice results for adjoint matter can be used to provide independent information on the conformal dynamics of two-index theories such as SU($N_c$) with two and four symmetric Dirac flavors.

    ↳ hep-thhep-lathep-phJHEP(2015)·8 citations
20. 20*

    Nuclear Physics from Lattice Quantum Chromodynamics

    Martin J. Savage🇺🇸

    Quantum Chromodynamics and Quantum Electrodynamics, both renormalizable quantum field theories with a small number of precisely constrained input parameters, dominate the dynamics of the quarks and gluons - the underlying building blocks of protons, neutrons, and nuclei. While the analytic techniques of quantum field theory have played a key role in understanding the dynamics of matter in high energy processes, they encounter difficulties when applied to low-energy nuclear structure and reactions, and dense systems. Expected increases in computational resources into the exascale during the next decade will provide the ability to determine a range of important strong interaction processes directly from QCD using the numerical technique of Lattice QCD. This will complement the nuclear physics experimental program, and in partnership with new thrusts in nuclear many-body theory, will enable unprecedented understanding and refinement of nuclear forces and, more generally, the visible matter in our universe. In this presentation, I will discuss the state-of-the-art Lattice QCD calculations of quantities of interest in nuclear physics, progress that is expected in the near future, and the anticipated impact.

    ↳ nucl-thhep-lathep-ph11 citations
21. 21*

    Theory status of quarkonium production in proton-nucleus collisions

    J.P. Lansberg🇫🇷

    I give a brief overview of the recent theoretical progress in the study of quarkonium production in proton-nucleus collisions in view of the recent LHC and RHIC results. A special emphasis is put on the excited states such as the psi', Upsilon(2S) and Upsilon(3S).

    ↳ nucl-thhep-exhep-phnucl-exJ.Phys.Conf.Ser.(2016)·4 citations
22. 22*

    Large scale CMB anomalies from thawing cosmic strings

    Christophe Ringeval🇧🇪 · Daisuke Yamauchi🇯🇵 · Jun'ichi Yokoyama🇯🇵 · Francois R. Bouchet🇫🇷

    Cosmic strings formed during inflation are expected to be either diluted over super-Hubble distances, i.e., invisible today, or to have crossed our past light cone very recently. We discuss the latter situation in which a few strings imprint their signature in the Cosmic Microwave Background (CMB) Anisotropies after recombination. Being almost frozen in the Hubble flow, these strings are quasi static and evade almost all of the previously derived constraints on their tension while being able to source large scale anisotropies in the CMB sky. Using a local variance estimator on thousand of numerically simulated Nambu-Goto all sky maps, we compute the expected signal and show that it can mimic a dipole modulation at large angular scales while being negligible at small angles. Interestingly, such a scenario generically produces one cold spot from the thawing of a cosmic string loop. Mixed with anisotropies of inflationary origin, we find that a few strings of tension GU = O(1) x 10^(-6) match the amplitude of the dipole modulation reported in the Planck satellite measurements and could be at the origin of other large scale anomalies.

    ↳ astro-ph.COgr-qchep-phhep-thJCAP(2016)·24 citations
23. 23*

    CP violation and CKM studies (and first LHCb Run II results)

    Patrick Koppenburg🇳🇱

    The LHC is the new b-hadron factory and will be dominating flavour physics until the start of Belle II, and beyond in many decay modes. While the $B$ factories and Tevatron experiments are still analysing their data, ATLAS, CMS and LHCb are producing interesting new results in CP violation and rare decays, that set strong constraints on models beyond that SM and exhibit some discrepancies with the SM predictions. The LHCb collaboration used the LHC 50 ns ramp-up period of July 2015 to measure the double-differential $J/\psi$, $J/\psi$-from-$b$-hadron and charm cross-sections at $\sqrt{s}=13$ TeV. Both measurements were performed directly on triggered candidates using a reduced data format that does not require offline processing.

    ↳ hep-exhep-phPoS(2015)·5 citations
24. 24*

    Heavy hypernuclei with $A=3$ in a relativistic quark-gluon model

    S.M. Gerasyuta🇷🇺 · E.E. Matskevich🇷🇺

    We generalized our approach to the hypernuclei with $A=B=3$ containing one charm or one bottom quark. We derive the relativistic nine-quark equations using the dispersion relation technique. The hypernuclei as the system of interacting quarks and gluons are considered. The relativistic nine-quark amplitudes of hypernuclei, including the constituent quarks with the charm or bottom are calculated. The approximate solutions of these equations are obtained using a method based on the extraction of leading singularities of the amplitudes. The poles of the multiquark amplitudes allow us to determine the masses and the binding energy of hypernuclei with the $A=3$. We predict the mass spectrum of hypernuclei with $A=3$, which is valuable to further experimental study of the hypernuclei with charm and bottom.

    ↳ nucl-thhep-ph0 citations
25. 25*

    A holographic realization of light dilatons

    Eugenio Megias🇩🇪

    We study a realization of light dilatons by considering Conformal Field Theories deformed by a nearly marginal operator $\mathcal{O}$. This is discussed in the holographic setup consisting of Renormalization Group flows that end on a soft wall. We obtain a mass formula for the dilaton as an average along the flow. Finally we discuss the holographic method to compute the condensate $⟨\mathcal{O}⟩$.

    ↳ hep-thhep-phJ.Phys.Conf.Ser.(2016)·4 citations
26. 26*

    Neutrino Flavour Evolution Through Fluctuating Matter

    Yue Yang🇺🇸 · James P. Kneller🇺🇸

    A neutrino propagating through fluctuating matter can experience large amplitude transitions between its states. Such transitions occur in supernovae and compact object mergers due to turbulent matter profiles and neutrino self-interactions. In this paper we study, both numerically and analytically, three-flavour neutrino transformation through fluctuating matter built from two and three Fourier modes. We find flavor transformation effects which cannot occur with just two flavours. For the case of two Fourier modes we observe the equivalent of "induced transparency" from quantum optics whereby transitions between a given pair of states are suppressed due to the presence of a resonant mode between another pair. When we add a third Fourier mode we find a new effect whereby the third mode can manipulate the transition probabilities of the two mode case so as to force complete transparency or, alternatively, restore "opacity" meaning the perturbative Hamiltonian regains its ability to induce neutrino flavour transitions. In both applications we find analytic solutions are able to match the amplitude and wavenumber of the numerical results to within a few percent. We then consider a case of turbulence and show how the theory can be used to understand the very different response of a neutrino to what appears to be two, almost identical, instances of turbulence.

    ↳ quant-phhep-phJ.Phys.G(2018)·6 citations
27. 27*

    A no-go theorem for monodromy inflation

    David Andriot🇩🇪

    We study the embedding of the monodromy inflation mechanism by E. Silverstein and A. Westphal (2008) in a concrete compactification setting. To that end, we look for an appropriate vacuum of type IIA supergravity, corresponding to the minimum of the inflaton potential. We prove a no-go theorem on the existence of such a vacuum, using ten-dimensional equations of motion. Anti-de Sitter and Minkowski vacua are ruled out; de Sitter vacua are not excluded, but have a lower bound on their cosmological constant which is too high for phenomenology.

    ↳ hep-thastro-ph.COhep-phJCAP(2016)·23 citations
28. 28*

    Standard Model Precision Electroweak Measurements at HL-LHC and Future Hadron Colliders

    A. Bodek🇺🇸

    We investigate the uncertainties for current and future measurements of electroweak (EW) parameters at hadron colliders. These include the measurement of the mass of the top quark ($M_T$), the direct measurement of the mass of the W boson ($M_W^{direct}$), the measurement of the effective EW mixing angle ${\sin }^2{\theta }_{\mathrm{eff}}^{\mathrm{lept}}$(M${}_Z$), and the measurement of the on-shell EW mixing angle ${\sin }^2{\theta }_W=1-M_W^2/M_Z^2$ which is equivalent to an indirect measurement of the W mass ($M_W^{indirect}$). Reduction of a factor of 2 to 3 in the measurement errors is expected in the future.

    ↳ hep-exhep-ph2 citations
29. 29*

    The Hidden Flat Like Universe II: Quasi inverse power law inflation by $f(T)$ gravity

    W. El Hanafy🇪🇬 · G.G.L. Nashed🇪🇬

    In a recent work, a particular class of $f(T)$ gravity, where $T$ is the teleparallel torsion scalar, has been derived. This class has been identified by flat-like universe (FLU) assumptions \cite{HN15}. The model is consistent with the early cosmic inflation epoch. A quintessence potential has been constructed from the FLU $f(T)$-gravity. We show that the first order potential of the induced quintessence is a quasi inverse power law inflation with an additional constant providing an end of the inflation with no need to an extra mechanism. At $e$-folds $N_{\ast }=55$ before the end of the inflation, this type of potential can perform both $E$ and $B$ modes of the cosmic microwave background (CMB) polarization pattern.

    ↳ gr-qcastro-ph.COhep-phhep-thAstrophys.Space Sci.(2016)·20 citations
30. 30*

    Improving the hierarchy sensitivity of ICAL using neural network

    Ali Ajmi🇮🇳 · Abhish Dev🇮🇳 · Mohammad Nizam🇮🇳 · Nitish Nayak🇮🇳 · S. Uma Sankar🇮🇳

    Atmospheric neutrino experiments can determine the neutrino mass hierarchy for any value of ${\delta }_{CP}$. The Iron Calorimeter (ICAL) detector at the India-based Neutrino Observatory can distinguish between the charged current interactions of ${\nu }_{\mu }$ and ${\bar{\nu }}_{\mu }$ by determining the charge of the produced muon. Hence it is particularly well suited to determine the hierarchy. The hierarchy signature is more prominent in neutrinos with energy of a few GeV and with pathlength of a few thousand kilometers, $\text{i.e.}$ neutrinos whose direction is not close to horizontal. We use adaptive neural networks to identify such events with good efficiency and good purity. The hierarchy sensitivity, calculated from these selected events, reaches a $3\sigma$ level, with a $\Delta {\chi }^2$ of 9.

    ↳ physics.ins-dethep-exhep-phJ.Phys.Conf.Ser.(2017)·14 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.