Mon·Aug 6, 2018Monday·August 6, 2018

1. 01*

   Probing millicharge at BESIII

   Zuowei Liu🇨🇳 · Yu Zhang🇨🇳

   We propose to search for millicharged particles at the BESIII detector which is operated at the Beijing Electron Positron Collider. We compute the monophoton signal events at the BESIII detector due to millicharged particle production, as well as due to standard model irreducible/reducible backgrounds. By utilizing all the data accumulated at the BESIII detector since 2011, we derive new leading upper limits on millicharge, $\epsilon \lesssim (0.86-2.5)\times 10^{-3}$, for the mass range, $0.1\text{GeV}\lesssim m\lesssim 1\text{GeV}$. Furthermore, projections with more data to be collected at the BESIII detector are also made. Our analysis significantly reduces the parameter region of millicharge to account for the anomalous 21 cm absorption signal near redshift $z\simeq 17$ recently observed by the EDGES experiment

   hep-phhep-exPRD(2019)·37 citations
2. 02*

   Fitting high-energy Littlest Seesaw parameters using low-energy neutrino data and leptogenesis

   Stephen F. King🇬🇧 · Susana Molina Sedgwick🇬🇧 · Samuel J. Rowley🇬🇧

   We show that the four high-energy Littlest Seesaw parameters in the flavour basis,namely two real Yukawa couplings plus the two right-handed neutrino masses, can be determined by an excellent fit to the seven currently constrained observables of low-energy neutrino data and leptogenesis. Taking into account renormalisation group corrections, we estimate ${\chi }^2\simeq 1.5-2.6$ for the three d.o.f., depending on the high-energy scale and the type of non supersymmetric Littlest Seesaw model. We extract allowed ranges of neutrino parameters from our fit data, including the approximate mu-tau symmetric predictions ${\theta }_{23}=45^o\pm 1^o$ and $\delta =-90^o\pm 5^o$, which, together with a normal mass ordering with $m_1=0$, will enable Littlest Seesaw models to be tested in future neutrino experiments.

   hep-phJHEP(2018)·30 citations
3. 03*

   Scotogenic dark matter and single-zero textures of the neutrino mass matrix

   Teruyuki Kitabayashi🇯🇵

   The scotogenic model can simultaneously account for the presence of dark matter and the origin of neutrino masses. We assume that the flavor neutrino mass matrix has one zero element and Yukawa matrix elements are real in the scotogenic model. It turns out that only one pattern of the flavor neutrino mass matrix in the one-zero-texture scheme within the scotogenic model is viable with the observed neutrino oscillation data, the relic abundance of the dark matter, and the upper limit of the branching ratio of the $\mu \to e\gamma$ process.

   hep-phPRD(2018)·22 citations
4. 04*

   Revisiting electroweak phase transition in the standard model with a real singlet scalar

   Cheng-Wei Chiang🇹🇼 · Yen-Ting Li🇹🇼 · Eibun Senaha🇰🇷

   We revisit the electroweak phase transition in the standard model with a real scalar, utilizing several calculation methods to investigate scheme dependences. We quantify the numerical impacts of Nambu-Goldstone resummation, required in one of the schemes, on the strength of the first-order electroweak phase transition. We also employ a gauge-independent scheme to make a comparison with the standard gauge-dependent results. It is found that the effect of the Nambu-Goldstone resummation is typically $\sim 1\%$. Our analysis shows that both gauge-dependent and -independent methods give qualitatively the same result within theoretical uncertainties. In either methods, the scale uncertainties in the ratio of critical temperature and the corresponding Higgs vacuum expectation value are more than 10%, which signifies the importance of higher-order corrections.

   hep-phPLB(2019)·69 citations
5. 05*

   Constraining exotic interactions

   Filip Ficek🇵🇱 · Dmitry Budker🇩🇪

   Beyond-the-standard-model interactions mediated by an exchange of virtual "new" bosons result in a finite set of possible effective interaction potentials between standard-model particles such as electrons and nucleons. We discuss the classification of such potentials and briefly review recent experiments searching for such exotic interactions at spatial scales from sub-nanometers to tens of thousand kilometers.

   hep-phAnnalen Phys.(2019)·9 citations
6. 06*

   Cutoff of IceCube Neutrino Spectrum due to t-channel Resonant Absorption by C$\nu$B

   Subhendra Mohanty🇮🇳 · Ashish Narang🇮🇳 · Soumya Sadhukhan🇮🇳

   The non-observation of neutrinos by the IceCube at the Glashow resonance energy of 6.3 PeV has been a long standing unresolved issue. In this paper we propose a t-channel neutrino absorption by the C$\nu$B, which causes a cutoff at 4.5 PeV neutrino energy, to explain the IceCube observations. We present a neutrinophilic 2HDM where the neutrino masses are generated by a low scale seesaw mechanism. A $\mathcal{O}$(10) MeV scalar mediates the interactions between left and right handed neutrinos and generates the t-channel diagram used for explaining the absence of Glashow resonance. The same scalar mediates the annihilation of the dark matter and generates the correct relic density.

   hep-phJCAP(2019)·13 citations
7. 07*

   Gravitational Effects in g Factor Measurements and High-Precision Spectroscopy: Limits of Einstein's Equivalence Principle

   Ulrich D. Jentschura🇺🇸

   We study the interplay of general relativity, the equivalence principle, and high-precision experiments involving atomic transitions and g factor measurements. In particular, we derive a generalized Dirac Hamiltonian, which describes both the gravitational coupling for weak fields, as well as the electromagnetic coupling, e.g., to a central Coulomb field. An approximate form of this Hamiltonian is used to derive the leading gravitational corrections to transition frequencies and g factors. The position-dependence of atomic transitions is shown to be compatible with the equivalence principle, up to a very good approximation. The compatibility of g factor measurements requires a deeper, subtle analysis, in order to eventually restore the compliance of g factor measurements with the equivalence principle. Finally, we analyze small, but important limitations of Einstein's equivalence principle due to quantum effects, within high-precision experiments. We also study the relation of these effects to a conceivable gravitationally induced collapse of a quantum mechanical wave function (Penrose conjecture), and space-time noncommutativity, and find that the competing effects should not preclude the measurability of the higher-order gravitational corrections. Surprisingly large higher-order gravitational effects are obtained for transitions in diatomic molecules.

   hep-phgr-qchep-thphysics.atom-phPRA(2018)·15 citations
8. 08*

   Graphene properties from curved space Dirac equation

   Antonio Gallerati🇮🇹

   A mathematical formulation for particle states and electronic properties of a curved graphene sheet is provided, exploiting a massless Dirac spectrum description for charge carriers living in a curved bidimensional background. In particular, we study how the new description affects the characteristics of the sample, writing an appropriate conductivity Kubo formula for the modified background. Finally, we provide a theoretical analysis for the particular case of a cylindrical graphene sample.

   ↳ hep-thcond-mat.mes-hallcond-mat.mtrl-scihep-ph+1Eur.Phys.J.Plus(2019)·26 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.