Wed·Dec 28, 2016Wednesday·December 28, 2016

1. 01*

   Constraining Dark Matter Neutrino Interaction with High Energy Neutrinos

   Carlos Argüelles🇺🇸 · Ali Kheirandish🇺🇸 · Aaron C. Vincent🇬🇧

   We employ data from the recently observed high-energy neutrino events at the IceCube Neutrino Observatory to constrain interactions between the dark matter (DM) in the Milky Way and the neutrino sector. We construct an extended un-binned likelihood in order to explore the parameter space of allowed interactions. We present results in the specific case of a scalar DM candidate interacting via a scalar mediator, and show that due to the energy dependence of the interaction cross section, this approach can constrain the coupling more strongly than traditional cosmological probes for some regions of the parameter space.

   hep-phastro-ph.HEPoS(2016)·2 citations
2. 02*

   The diphoton signal of the light Higgs boson in Natural NMSSM

   Junjie Cao🇨🇳 · Xiaofei Guo🇨🇳 · Yangle He🇨🇳 · Peiwen Wu🇰🇷 · Yang Zhang🇨🇳

   Natural Next-to-Minimal Supersymmetric Standard Model (nNMSSM) is featured by predicting one CP-even Higgs boson satisfying $m_{h_1}\lesssim 120\mathrm{GeV}$ and Higgsinos lighter than about 300 GeV, and consequently the cross section for DM-nucleon scattering in this scenario is usually quite large. We study the diphoton signal of the light Higgs boson in nNMSSM by considering the tight constraints from the latest LUX and PandaX-II experiments, and we conclude that the optimal value of the signal rate at 8 TeV LHC is greatly reduced in comparison with earlier predictions. For example, previous studies indicated that the rate may exceed $120\mathrm{fb}$ for $m_{h_1}\simeq 80\mathrm{GeV}$, while it is at most $25\mathrm{fb}$ if the lightest neutralino in the scenario is fully responsible for the measured DM relic density. We also investigate the case of $m_{h_1}\simeq 98\mathrm{GeV}$ which is hinted by the excesses of the LEP analysis on $Z\bar{b}b$ signal and the CMS analysis on the diphoton signal. We conclude that nNMSSM can explain simultaneously the excesses at $1\sigma$ level without violating any known constraints.

   hep-phPRD(2017)·127 citations
3. 03*

   Controlling $\rho$ width effects for a precise value of $\alpha$ in $B\to \rho \rho$

   Michael Gronau🇮🇱 · Jonathan L. Rosner🇺🇸

   It has been pointed out that the currently most precise determination of the weak phase ${\varphi }_2=\alpha$ of the Cabibbo-Kobayashi-Maskawa (CKM) matrix achieved in $B\to \rho \rho$ decays is susceptible to a small correction at a level of $({\Gamma }_{\rho }/m_{\rho }{)}^2$ due to an $I=1$ amplitude caused by the $\rho$ width. Using Breit-Wigner distributions for the two pairs of pions forming $\rho$ mesons, we study the $I=1$ contribution to $B\to \rho \rho$ decay rates as function of the width and location of the $\rho$ band. We find that in the absence of a particular enhancement of the $I=1$ amplitude reducing a single band to a width ${\Gamma }_{\rho }$ at SuperKEKB leads to results which are completely insensitive to the $\rho$ width. If the $I=1$ amplitude is dynamically enhanced relative to the $I=0,2$ amplitude one could subject its contribution to a "magnifying glass" measurement using two separated $\rho$ bands of width ${\Gamma }_{\rho }$. Subtraction of the $I=1$ contribution from the measured decay rate would lead to a very precise determination of the $I=0,2$ amplitude needed for performing the isospin analysis.

   hep-phhep-exPLB(2017)·8 citations
4. 04*

   The effective neutrino mass of neutrinoless double-beta decays: how possible to fall into a well

   Zhi-zhong Xing🇨🇳 · Zhen-hua Zhao🇨🇳

   If massive neutrinos are the Majorana particles and have a normal mass ordering, the effective mass term $⟨m{⟩}_{ee}^{}$ of a neutrinoless double-beta ($0\nu 2\beta$) decay may suffer significant cancellations among its three components and thus sink into a decline, resulting in a "well" in the three-dimensional graph of $|⟨m{⟩}_{ee}^{}|$ against the smallest neutrino mass $m_1^{}$ and the relevant Majorana phase $\rho$. We present a new and complete analytical understanding of the fine issues inside such a well, and discover a novel threshold of $|⟨m{⟩}_{ee}^{}|$ in terms of the neutrino masses and flavor mixing angles: $|⟨m{⟩}_{ee}^{}{|}_{\ast }^{}=m_3^{}{\sin }^2{\theta }_{13}^{}$ in connection with $\tan {\theta }_{12}^{}=\sqrt{m_1^{}/m_2^{}}$ and $\rho =\pi$. This threshold point, which links the {\it local} minimum and maximum of $|⟨m{⟩}_{ee}^{}|$, can be used to signify observability or sensitivity of the future $0\nu 2\beta$-decay experiments. Given current neutrino oscillation data, the possibility of $|⟨m{⟩}_{ee}^{}|<|⟨m{⟩}_{ee}^{}{|}_{\ast }^{}$ is found to be very small.

   hep-phhep-exEPJC(2017)·25 citations
5. 05*

   A study of structure functions with the DGLAP: equations at small $x$ with $O(x)$ and $O(x^2)$

   Luxmi Machahari🇮🇳 · D. K. Choudhury🇮🇳 · P.K.Sahariah🇮🇳

   We obtain a pair of second order differential equations in two variables $x$ and $t$ from the coupled DGLAP QCD evolution equations at small $x$ using the standard Taylor series expansion method.To that end we keep terms upto $O(x^2)$.We use the standard assumption about the relationship between the singlet Structure Function and the gluon distributions available in current literature. We solve the taylor approximated $O(x)$ DGLAP equations by Lagrange's auxiliary method and $O(x^2)$ equation by Method of Separation of Variables and then show that the two solutions obtained in each for $O(x)$ and $O(x^2)$ are not identical in general.Analysis of the results obtained are done in the range of the recent HERA data.

   hep-ph0 citations
6. 06*

   Two component WIMP-FImP dark matter model with singlet fermion, scalar and pseudo scalar

   Amit Dutta Banik🇮🇳 · Madhurima Pandey🇮🇳 · Debasish Majumdar🇮🇳 · Anirban Biswas🇮🇳

   We explore a two component dark matter model with a fermion and a scalar. In this scenario the Standard Model (SM) is extended by a fermion, a scalar and an additional pseudo scalar. The fermionic component is assumed to have a global ${\mathrm{U}(1)}_{\mathrm{DM}}$ and interacts with the pseudo scalar via Yukawa interaction while a ${\mathbb{Z}}_2$ symmetry is imposed on the other component -- the scalar. These ensure the stability of both the dark matter components. Although the Lagrangian of the present model is CP conserving, however the CP symmetry breaks spontaneously when the pseudo scalar acquires a vacuum expectation value (VEV). The scalar component of the dark matter in the present model also develops a VEV on spontaneous breaking of the ${\mathbb{Z}}_2$ symmetry. Thus the various interactions of the dark sector and the SM sector are progressed through the mixing of the SM like Higgs boson, the pseudo scalar Higgs like boson and the singlet scalar boson. We show that the observed gamma ray excess from the Galactic Centre, self-interaction of dark matter from colliding clusters as well as the 3.55 keV X-ray line from Perseus, Andromeda etc. can be simultaneously explained in the present two component dark matter model.

   hep-phEPJC(2017)·66 citations
7. 07*

   Generalized polarizabilities of the nucleon in baryon chiral perturbation theory

   Vadim Lensky🇩🇪 · Vladimir Pascalutsa🇩🇪 · Marc Vanderhaeghen🇩🇪

   The nucleon generalized polarizabilities (GPs), probed in virtual Compton scattering (VCS), describe the spatial distribution of the polarization density in a nucleon. They are accessed experimentally via the process of electron-proton bremsstrahlung ($ep\to ep\gamma$) at electron-beam facilities, such as MIT-Bates, CEBAF (Jefferson Lab), and MAMI (Mainz). We present the calculation of the nucleon GPs and VCS observables at next-to-leading order in baryon chiral perturbation theory (B$\chi$PT), and confront the results with the empirical information. At this order our results are predictions, in the sense that all the parameters are well-known from elsewhere. Within the relatively large uncertainties of our calculation we find good agreement with the experimental observations of VCS and the empirical extractions of the GPs. We find large discrepancies with previous chiral calculations---all done in heavy-baryon $\chi$PT (HB$\chi$PT)---and discuss the differences between B$\chi$PT and HB$\chi$PT responsible for these discrepancies.

   hep-phnucl-exnucl-thEPJC(2017)·23 citations
8. 08*

   The decays $\tau \to {\nu }_{\tau }(K^{\ast }(892),K^{\ast }(1410),K_1(1270),K_1(1650),a_1(1260),a_1(1640))$ in the Extended Nambu-Jona-Lasinio Model

   M.K.Volkov🇷🇺 · K. Nurlan🇷🇺

   The decays $\tau \to {\nu }_{\tau }(K^{\ast }(892),K^{\ast }(1410),K_1(1270),K_1(1650),a_1(1260),a_1(1640))$ in the extended NJL model are calculated. The results obtained for the decays are $\tau \to {\nu }_{\tau }(K^{\ast }(892),K^{\ast }(1410),K_1(1270))$ in a satisfactory agreement with the experimental data. There are no experimental data for other types of decay. Therefore, the obtained results should be considered as predictions for further experiments.

   hep-phPhys.Part.Nucl.Lett.(2017)·5 citations
9. 09*

   The initial state and hard probes: a brief review

   Raju Venugopalan (BNL)🇺🇸

   We provide a brief review of some of the recent developments in our understanding of the initial state in ultra-relativistic heavy-ion collisions.

   hep-phNucl.Part.Phys.Proc.(2017)·2 citations
10. 10*

    Leading order relativistic hyperon-nucleon interactions in chiral effective field theory

    Kai-Wen Li🇨🇳 · Xiu-Lei Ren🇨🇳 · Li-Sheng Geng🇨🇳 · Bing-Wei Long🇨🇳

    We apply a recently proposed covariant power counting in nucleon-nucleon interactions to study strangeness $S=-1$ $\Lambda N-\Sigma N$ interactions in chiral effective field theory. At leading order, Lorentz invariance introduces 12 low energy constants, in contrast to the heavy baryon approach, where only five appear. The Kadyshevsky equation is adopted to resum the potential in order to account for the non-perturbative nature of hyperon-nucleon interactions. A fit to the $36$ hyperon-nucleon scattering data points yields ${\chi }^2\simeq 16$, which is comparable with the sophisticated phenomenological models and the next-to-leading order heavy baryon approach. However, one cannot achieve a simultaneous description of the nucleon-nucleon phase shifts and strangeness $S=-1$ hyperon-nucleon scattering data at leading order.

    ↳ nucl-thhep-phCPC(2018)·59 citations
11. 11*

    Superconducting-Gravimeter Tests of Local Lorentz Invariance

    Natasha A. Flowers🇺🇸 · Casey Goodge🇺🇸 · Jay D. Tasson🇺🇸

    Superconducting-gravimeter measurements are used to test the local Lorentz invariance of the gravitational interaction and of matter-gravity couplings. The best laboratory sensitivities to date are achieved via a maximum-reach analysis for 13 Lorentz-violating operators, with some improvements exceeding an order of magnitude.

    ↳ gr-qchep-phPRL(2017)·72 citations
12. 12*

    Collective Excitations in Hot QCD Plasma

    Navid Abbasi🇮🇷 · Davood Allahbakhshi🇮🇷 · Ali Davody🇮🇷 · Seyed Farid Taghavi🇮🇷

    We study the long wavelength excitations in rotating QCD fluid in presence of an external magnetic field at finite vector and axial charge densities. We consider the fluctuations of vector and axial charge currents coupled to energy and momentum fluctuations and compute the $SO(3)$ covariant dispersion relations of the six corresponding hydrodynamic modes. Among them, there are always two scalar Chiral Magnetic-Vortical-Heat (CMVH) waves; In the absence of magnetic field (vorticity) these waves reduce to CVH (CMH) waves. While CMVH waves are the mixed of CMH and CVH waves, they have generally different velocities compared to the sum of velocities of the latter waves. The other four modes, which are made out of scalar-vector fluctuations, are mixed Sound-Alfvén waves. We show that in the direction parallel to both magnetic field and vorticity, these four modes are the two ordinary sound modes together with two Chiral Alfvén waves (CAW).

    ↳ nucl-thhep-phhep-thPRD(2017)·13 citations
13. 13*

    Vacuum Polarization Energy for General Backgrounds in One Space Dimension

    H. Weigel🇿🇦

    For field theories in one time and one space dimensions we propose an efficient method to compute the vacuum polarization energy of static field configurations that do not allow a decomposition into symmetric and anti--symmetric channels. The method also applies to scenarios in which the masses of the quantum fluctuations at positive and negative spatial infinity are different. As an example we compute the vacuum polarization energy of the kink soliton in the ${\varphi }^6$ model. We link the dependence of this energy on the position of the soliton to the different masses.

    ↳ hep-thhep-phnlin.PSPLB(2017)·24 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.