Thu·Oct 11, 2018Thursday·October 11, 2018

1. 01*

   Are We Looking at Neutrino Absorption Spectra at IceCube?

   Siddhartha Karmakar🇮🇳 · Sujata Pandey🇮🇳 · Subhendu Rakshit🇮🇳

   The observed spectrum of ultrahigh energy neutrinos at IceCube might be indicative of absorption of such neutrinos in ultralight dark matter halos. We point out that various features of this spectrum can be explained by such absorptions. For a light $Z^{\prime }$-mediated $t$-channel interaction between dark matter and neutrinos, we propose a novel mechanism of absorption of these neutrinos at particular energies. This can save the models of AGN predicting large neutrino flux at energies more than a PeV.

   hep-phastro-ph.HE15 citations
2. 02*

   Interactions of Astrophysical Neutrinos with Dark Matter: A model building perspective

   Sujata Pandey🇮🇳 · Siddhartha Karmakar🇮🇳 · Subhendu Rakshit🇮🇳

   We explore the possibility that high energy astrophysical neutrinos can interact with the dark matter on their way to Earth. Keeping in mind that new physics might leave its signature at such energies, we have considered all possible topologies for effective interactions between neutrino and dark matter. Building models, that give rise to a significant flux suppression of astrophysical neutrinos at Earth, is rather difficult. We present a $Z^{\prime }$-mediated model in this context. Encompassing a large variety of models, a wide range of dark matter masses from $10^{-21}$ eV up to a TeV, this study aims at highlighting the challenges one encounters in such a model building endeavour after satisfying various cosmological constraints, collider search limits and electroweak precision measurements.

   hep-phastro-ph.HEJHEP(2019)·64 citations
3. 03*

   Constraints from the S-parameter on models with scalar triplets

   P. Q. Hung🇺🇸

   Models with scalar triplets can have a large impact on the electroweak precision S-parameter and have to be dealt "with extreme prejudice". Such models, and in particular the Georgi-Machacek (GM) model, involve a complex triplet scalar containing doubly-charged Higgses plus a real triplet and are of recent phenomenological interests. It turns out that large mass splittings within the triplet will not be allowed by the S-parameter in the absence of extra fermionic degrees of freedom. Simply speaking, having only an extra triplet of scalars severely restricts the mass splitting within that triplet even with the present precision on the S-parameter which will further be improved with the proposed Higgs factories.

   hep-ph1 citation
4. 04*

   Three-loop planar master integrals for heavy-to-light form factors

   Long-Bin Chen🇨🇳 · Jian Wang🇩🇪

   We calculate analytically the three-loop planar master integrals relevant for heavy-to-light form factors using the method of differential equations. After choosing a proper canonical basis, the boundary conditions are easy to be determined, and the solution of differential equations is greatly simplified. The results for seventy-one master integrals at general kinematics are all expressed in terms of harmonic polylogarithms.

   hep-phPLB(2018)·9 citations
5. 05*

   Dark Quark Nuggets

   Yang Bai🇺🇸 · Andrew J. Long🇺🇸 · Sida Lu🇺🇸

   "Dark quark nuggets", a lump of dark quark matter, can be produced in the early universe for a wide range of confining gauge theories and serve as a macroscopic dark matter candidate. The two necessary conditions, a nonzero dark baryon number asymmetry and a first-order phase transition, can be easily satisfied for many asymmetric dark matter models and QCD-like gauge theories with a few massless flavors. For confinement scales from 10 keV to 100 TeV, these dark quark nuggets with a huge dark baryon number have their masses vary from $10^{23}\mathrm{g}$ to $10^{-7}\mathrm{g}$ and their radii from $10^8\mathrm{cm}$ to $10^{-15}\mathrm{cm}$. Such macroscopic dark matter candidates can be searched for by a broad scope of experiments and even new detection strategies. Specifically, we have found that the gravitational microlensing experiments can probe heavier dark quark nuggets or smaller confinement scales around 10 keV; collision of dark quark nuggets can generate detectable and transient electromagnetic radiation signals; the stochastic gravitational wave signals from the first order phase transition can be probed by the pulsar timing array observations and other space-based interferometry experiments; the approximately massless dark mesons can behave as dark radiation to be tested by the next-generation CMB experiments; the free dark baryons, as a subcomponent of dark matter, can have direct detection signals for a sufficiently strong interaction strength with the visible sector.

   hep-phastro-ph.COPRD(2019)·198 citations
6. 06*

   Heavy-light mesons spectra in a contact interaction

   M.A. Bedolla🇮🇹 · E. Santopinto🇮🇹 · L. X. Gutiérrez-Guerrero🇲🇽

   We present the spectrum and decay constants of heavy-light mesons in four different channels: pseudo-scalar, vector, scalar and axial vector. We extend the framework for our previous analysis in a unified symmetry-preserving Schwinger-Dyson equations treatment of a vector$\times$vectord contact interaction. Despite the simplicity of our model, the results found for the meson masses are in good agreement experimental data and earlier model calculations based upon Schwinger-Dyson and Bethe-Salpeter equations (BSEs) involving sophisticated interaction kernels.

   hep-phEPJ Web Conf.(2018)·5 citations
7. 07*

   Leptonic unitarity triangles: RGE running effects and $\mu$-$\tau$ reflection symmetry breaking

   Jing-yu Zhu🇨🇳

   There are six leptonic unitarity triangles (LUTs) defined by six orthogonality conditions of the three-family lepton flavor mixing matrix in the complex plane. In the framework of the standard model or the minimal supersymmetric standard model, the evolutions of sides and inner angles of the six LUTs from a superhigh energy scale ${\Lambda }_{\mathrm{H}}^{}$ to the electroweak scale ${\Lambda }_{\mathrm{EW}}^{}$ due to the renormalization-group equation (RGE) running are derived in the integral form for both Dirac and Majorana neutrinos. Furthermore, the LUTs as an intuitively geometrical language are applied to the description of the RGE-induced $\mu$-$\tau$ reflection symmetry breaking analytically and numerically.

   hep-phhep-exPRD(2019)·13 citations
8. 08*

   Secret interactions of neutrinos with light gauge boson at the DUNE near detector

   Pouya Bakhti🇮🇷 · Yasaman Farzan🇮🇷 · Meshkat Rajaee🇮🇷

   Secret interactions of neutrinos with light new gauge bosons, $Z^{\prime }$, can lead to a rich phenomenology in supernova explosion as well as in the early Universe. This interaction can also lead to new decay modes for charged mesons, ${\pi }^{+}(K^{+})\to e^{+}\nu Z^{\prime }$, and subsequently to $Z^{\prime }\to \nu \bar{\nu }$. After demonstrating that such an interaction can be accommodated within viable electroweak symmetric models, we study how the near detector (ND) of DUNE can probe this scenario. We also discuss how the DUNE ND can make it possible to reconstruct the flavor structure of the $Z^{\prime }$ coupling to neutrinos.

   hep-phhep-exPRD(2019)·38 citations
9. 09*

   Scalar Kinetic Mixing and the Renormalization Group

   Johan Bijnens🇸🇪 · Joel Oredsson🇸🇪 · Johan Rathsman🇸🇪

   Quantum field theories containing scalar fields with equal quantum numbers allow for a mixed kinetic term in the Lagrangian. It has been argued that this mixing must be taken into consideration when performing renormalization group (RG) analyses of such a theory. However, from the fact that scalar kinetic mixing does not correspond to a physical observable, we show that no extra parameters need to be introduced. Using a toy model, we explicitly derive the 1-loop RG equations (RGEs) in three different renormalization schemes to demonstrate how this issue can be dealt with. In schemes without kinetic mixing, either the fields mix during renormalization to produce non-diagonal anomalous dimensions or the RGEs explicitly depend on the scalar masses. Finally, we show how the different schemes are related to each other by scale dependent field redefinitions.

   hep-phPLB(2019)·14 citations
10. 10*

    Excited heavy meson decays to light vector mesons: implications for spectroscopy

    S. Campanella🇮🇹 · P. Colangelo🇮🇹 · F. De Fazio🇮🇹

    We analyze strong decays of excited charmed and beauty mesons into a light vector meson, exploiting the effective field theory based on heavy quark (HQ) symmetries for heavy mesons, and on the hidden gauge symmetry to incorporate light vector mesons. HQ symmetries allow to classify the heavy mesons in spin doublets, and to relate decays of excited states. We build effective Lagrangian terms governing the ${\mathcal{H}}_i\to P^{(\ast )}V$ modes, with ${\mathcal{H}}_i$ an excited $s$, $p$, $d$ and $f$-wave heavy-light quark meson, $P,P^{\ast }$ the lowest-lying $J^P=(0^{-},1^{-})$ heavy-light mesons, and V a light vector meson. Predictions are provided for ratios of decay widths that are independent of the strong couplings in the effective Lagrangian terms. A classification of the newly observed heavy-light mesons is proposed.

    hep-phhep-exPRD(2018)·23 citations
11. 11*

    High Scale Boundary Conditions in Models with Two Higgs Doublets

    John McDowall🇬🇧 · David J Miller🇬🇧

    We investigate high scale boundary conditions on the quartic Higgs-couplings and their $\beta$-functions in the Type-II Two Higgs Doublet Model and the Inert Doublet Model. These conditions are associated with two possible UV physics scenarios: the Multiple Point Principle, in which the potential exhibits a second minimum at $M_{Pl}$, and Asymptotic Safety, where the scalar couplings run towards an interacting UV fixed point at high scales. We employ renormalisation group running at two-loops and apply theoretical and experimental constraints to their parameter spaces. We find neither model can simultaneously accommodate the MPP whilst also providing realistic masses for both the Higgs and the top quark. However, we do find regions of parameter space compatible with Asymptotic Safety.

    hep-phPRD(2019)·8 citations
12. 12*

    MBnumerics: Numerical integration of Mellin-Barnes integrals in physical regions

    Johann Usovitsch🇮🇪 · Ievgen Dubovyk🇩🇪 · Tord Riemann🇵🇱

    We introduce techniques to treat numerically Mellin-Barnes integrals in physical regions, which arise in the need of the computation of Feynman integrals for the electroweak two-loop corrections to the pseudo observables at the Z-boson resonance.

    hep-phPoS(2018)·19 citations
13. 13*

    Constraints on the quartic Higgs self-coupling from double-Higgs production at future hadron colliders

    Wojciech Bizoń🇩🇪 · Ulrich Haisch🇩🇪 · Luca Rottoli🇬🇧

    We study the indirect constraints on the quartic Higgs self-coupling that arise from double-Higgs production at future hadron colliders. To this purpose, we calculate the two-loop contributions to the $gg\to hh$ amplitudes that involve a modified $h^4$ vertex. Based on our results, we estimate the reach of a $pp$ collider operating at $27\mathrm{TeV}$ and $100\mathrm{TeV}$ centre-of-mass energy in constraining the cubic and quartic Higgs self-couplings by measurements of double-Higgs and triple-Higgs production in gluon-fusion.

    hep-phhep-exJHEP(2019)·73 citations
14. 14*

    Dark Matter Blind Spots at One-Loop

    Tao Han🇺🇸 · Hongkai Liu🇺🇸 · Satyanarayan Mukhopadhyay🇮🇳 · Xing Wang🇺🇸

    We evaluate the impact of one-loop electroweak corrections to the spin-independent dark matter (DM) scattering cross-section with nucleons (${\sigma }_{\mathrm{SI}}$), in models with a so-called blind spot for direct detection, where the leading-order prediction for the relevant DM coupling to the Higgs boson, and therefore ${\sigma }_{\mathrm{SI}}$, are vanishingly small. Adopting a simple illustrative scenario in which the DM state results from the mixing of electroweak singlet and doublet fermions, we compute the relevant higher order corrections to the scalar effective operator contributions to ${\sigma }_{\mathrm{SI}}$, stemming from both triangle and box diagrams involving the SM and dark sector fields. It is observed that in a significant region of the singlet-doublet model-space, the one-loop corrections ``unblind'' the tree-level blind spots and lead to detectable SI scattering rates at future multi-ton scale liquid Xenon experiments, with ${\sigma }_{\mathrm{SI}}$ reaching values up to a few times $10^{-47}{\mathrm{cm}}^2$, for a weak scale DM with $\mathcal{O}(1)$ Yukawa couplings. Furthermore, we find that there always exists a new SI blind spot at the next-to-leading order, which is perturbatively shifted from the leading order one in the singlet-doublet mass parameters. For comparison, we also present the tree-level spin-dependent scattering cross-sections near the SI blind-spot region, that could lead to a larger signal. Our results can be mapped to the blind-spot scenario for bino-Higgsino DM in the MSSM, with other sfermions, the heavier Higgs boson, and the wino decoupled.

    hep-phhep-exJHEP(2019)·30 citations
15. 15*

    Neutron stars meet constraints from high and low energy nuclear physics

    V. Sagun🇺🇦 · I. Lopes🇵🇹 · A. Ivanytskyi🇺🇦

    A novel equation of state used for analysis of the heavy ion collision experimental data is generalized to also describe the matter inside neutron stars. This approach differs from others by including an induced surface tension caused by the short range repulsion between particles accounted by presence of their hard cores. This new equation of state respects thermodynamic consistency and is free from the usual causality problems. This makes it applicable over a wide range of temperatures and baryon densities, including the ones inside neutron stars. Despite small number of parameters the present equation of state reproduces properties of the saturated nuclear matter and is consistent with the proton flow constraint as well as with astrophysical data obtained from neutron star observations. Accordingly, we found the sets of parameters that agree with the same ones obtained from the heavy ion collision data analysis.

    ↳ astro-ph.HEhep-phNPA(2019)·12 citations
16. 16*

    $\Omega d$ bound state

    H. Garcilazo🇲🇽 · A. Valcarce🇪🇸

    The lattice QCD analyses of the HAL QCD Collaboration predicts a strongly attractive potential in the $\Omega N$ ${}^5{S}_2$ channel which supports a bound state. In this paper we show that this $\Omega N$ channel together with the $NN$ ${}^3{S}_1$ channel give rise to a $\Omega d$ bound state in the state with maximal spin $(I,J^P)=(0,5/2^{+})$ with a binding energy of $\sim$ 17 MeV.

    ↳ nucl-thhep-phPRC(2018)·13 citations
17. 17*

    Radiative and electroweak penguin decays at $e^{+}{e}^{-}$ $B$-factories

    S. Sandilya🇺🇸

    $B$-meson decays involving radiative and electroweak penguin processes are sensitive probes to new physics beyond the standard model. The Belle experiment recently reported measurements of the inclusive radiative decay $B\to X_s^{}\gamma$, and exclusive radiative decays $B\to K^{\ast }\gamma$ and $B\to K_S^0\eta \gamma$. A lepton-flavor dependent measurements of angular observables for the decays $B\to K^{\ast }\ell \ell$ by Belle hinted at possible deviation from lepton-flavor-universality. Any departure from lepton flavor universality is essentially accompanied by lepton flavor violation. Recently, lepton-flavor-violating decays $B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp }$ are searched at Belle, and stringent limits on their branching fractions are set. The BaBar experiment has searched for the decay $B^{+}\to K^{+}{\tau }^{+}{\tau }^{-}$, which comprises third generation of the lepton family. The decays $B\to h\nu \bar{\nu }$ are searched at Belle and obtained upper limits for these decays are close to the standard model predictions.

    ↳ hep-exhep-phSpringer Proc.Phys.(2019)·0 citations
18. 18*

    Perturbations of bounce inflation scenario from $f(T)$ modified gravity revisited

    Taotao Qiu🇨🇳 · Kun Tian🇨🇳 · Shaojun Bu🇨🇳

    In this work, we revisit the perturbations that are generated in the bounce inflation scenario constructed within the framework of $f(T)$ theory. It has been well known that pure $f(T)$ theory cannot give rise to bounce inflation behavior, so aside from the gravity part, we also employ a canonical scalar field for minimal extension. We calculate the perturbations in $f(T)$ theory using the well-established ADM formalism, and find various conditions to avoid their pathologies. We find that it is indeed very difficult to obtain a healthy model without those pathologies, however, one may find a way out if a potential requirement, say, to keep every function continuous, is abandoned.

    ↳ gr-qcastro-ph.COhep-phhep-thEPJC(2019)·22 citations
19. 19*

    50 years in the Landau Institute environment

    G.E. Volovik🇫🇮

    It is impossible to review all the fundamental works of Landau Institute, which made important contribution to physics in general. Here I will discuss only a part of these works, only those which directly influence my own work during 50 years (1968-2018). Khalatnikov created the unique Institute, where practically all important areas of theoretical physics have been represented, opening broad possibilities for collaboration. The multidisciplinary environment of the Landau Institute was the main element of inspiration.

    ↳ physics.hist-phcond-mat.othergr-qchep-phPhys.Usp.(2019)·0 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.