We examine the current constraints and future sensitivity of coherent elastic neutrino-nucleus scattering ($\mathrm{CE}\nu \mathrm{NS}$) experiments to mixing scenarios involving a $Z^{\prime }$ which interacts via portals with the standard model. We contrast the results against those from fixed target, atomic parity violation, and solar neutrino experiments. We demonstrate a significant dependence of the experimental reach on the $Z^{\prime }$ coupling nonuniversality and the complementarity of $\mathrm{CE}\nu \mathrm{NS}$ to existing searches.

Motivated by recent results from neutrino experiments, we study the neutrino masses and mixing in the framework of a SUSY $SU(5)\times {\mathbb{A}}_4$ model. The hybrid of Type I and Type II seesaw mechanisms leads to the nonzero value of the reactor angle ${\theta }_{13}\ne 0$ and to the recently disfavored maximal atmospheric angle ${\theta }_{23}\ne 45°$ by the NOvA experiment. The phenomenological consequences of the model are studied for both normal and inverted mass hierarchies. The obtained ranges for the effective Majorana neutrino mass $m_{\beta \beta }$, the electron neutrino mass $m_{{\nu }_e}$, and the $CP$ violating phase ${\delta }_{CP}$ lie within the current experimental allowed ranges where we find that the normal mass hierarchy is favored over the inverted one.

In this work, we present an explicit form of the Lüscher equation and consider the construction of the operators in different irreducible representations for the case of scattering of two vector particles. The formalism is applied to scalar QED in the Higgs Phase, where the $U(1)$ gauge boson acquires mass.

We present a method for defining a lattice realization of the ${\varphi }^4$ quantum field theory on a simplicial complex in order to enable numerical computation on a general Riemann manifold. The procedure begins with adopting methods from traditional Regge calculus (RC) and finite element methods (FEM) plus the addition of ultraviolet counterterms required to reach the renormalized field theory in the continuum limit. The construction is tested numerically for the two-dimensional ${\varphi }^4$ scalar field theory on the Riemann two-sphere, ${\mathbb{S}}^2$, in comparison with the exact solutions to the two-dimensional Ising conformal field theory (CFT). Numerical results for the Binder cumulants (up to 12th order) and the two- and four-point correlation functions are in agreement with the exact $c=1/2$ CFT solutions.

We report results on the quark spectral function in the Landau gauge at finite temperature, determined from its Dyson-Schwinger equation. Compared to earlier quenched results, this study encompasses unquenched $N_f=2+1$ fermion flavors in the medium. For the computation of real-time spectra, we deploy the recent Bayesian Reconstruction (BR) method and develop a new prior in order to better assess the inherent systematic uncertainties. We identify the quark quasiparticle spectrum and analyze the (non)appearance of zero modes at or around the pseudocritical temperature. In both, the fully unquenched system and a simpler truncation, using a model for the gluon propagator, we observe a characteristic two-peak structure at zero three-momentum. The temperature dependence of these structures, in case of the gluon propagator model, is different than observed in previous studies. For the back-coupled and unquenched case, we find interesting modifications at and around the pseudocritical transition temperature.

We construct the quark-antiquark chiral odd distribution amplitudes including twist-four mass contributions for tensor mesons. We also give quark-antiquark-gluon distribution amplitudes, where we calculate the input parameters with QCD sum rules. With the help of equations of motion, we determine the twist-three and twist-four distribution amplitudes including SU(3) breaking terms. We use QCD light-come sum rules to derive the form factors for the decay $B\to f_2(1270)$ with vector, axial-vector and tensor currents. We also give the $q^2$ dependence of the form factors.

We analyze the origin of the structure observed in the reaction $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ for ${\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ invariant masses close to the antiproton-proton ($\overline{p}p$) threshold, commonly associated with the $X(1835)$ resonance. Specifically, we explore the effect of a possible contribution from the two-step process $J/\psi \to \gamma \overline{N}N\to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$. The calculation is performed in the distorted-wave Born approximation which allows an appropriate inclusion of the $\overline{N}N$ interaction in the transition amplitude. The $\overline{N}N$ amplitude itself is generated from a corresponding potential recently derived within chiral effective field theory. We are able to describe the invariant-mass dependence of the measured spectra for the reactions $J/\psi \to \gamma \overline{p}p$ and $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ around the $\overline{p}p$ threshold. The structure seen in the ${\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ spectrum emerges as a threshold effect due to the opening of the $\overline{p}p$ channel.

We reexamine the structure of the $n=2$ levels of muonic hydrogen using a two-body potential that includes all relativistic, recoil and one-loop corrections. The potential was originally derived from QED to describe the muonium atom and accounts for all contributions to order ${\alpha }^5$. Since one-loop corrections are included, the anomalous magnetic moment contributions of the muon can be identified and replaced by the proton anomalous magnetic moment to describe muonic hydrogen with a pointlike proton. This serves as a convenient starting point to include the dominant electron vacuum polarization corrections to the spectrum and extract the proton’s mean squared radius $r_p=\sqrt{⟨r^2⟩}$. Our results are consistent with other theoretical calculations that find that the muonic hydrogen value for $r_p$ is smaller than the result obtained from electron scattering.

We present noncritical Bianchi type I string cosmology solutions in the presence of central charge deficit term $\mathrm{\Lambda }$. The leading-order string frame curvature appears to be in the high curvature limit $R{\alpha }^{\prime }\gtrsim 1$, which underlines the necessity of including higher-order ${\alpha }^{\prime }$ corrections. We give new solutions of two-loop (first-order ${\alpha }^{\prime }$) $\beta$-function equations of the $\sigma$ model with nonzero $\mathrm{\Lambda }$ and the dilaton field in both cases of the absence and presence of a spatially homogeneous $H$ field ($H=dB$). Also, the evolution of solutions is studied in the Einstein frame, in which the string effective action can transform to Gauss-Bonnet gravity model coupled to a dilaton field with potential. We study explicit examples in first-order ${\alpha }^{\prime }$ with chosen values of appeared constants in the solutions and discuss the cosmological implications.

We study fermions in a domain wall backgrounds in five dimensional supergravity, which is similar to zero temperature limit of holographic superconductor. We find the fermionic operators for small charges in the dual four dimensional theory have gapped spectrum.

We use the formalism of noisy Gaussian channels to derive explicit transformation laws describing how an arbitrary multimode Gaussian state of a scalar quantum field is perceived by a number of accelerating observers, each having access to at least one of the modes. Our work, which generalizes earlier results of Ahmadi et al. [Phys. Rev. D 93, 124031 (2016)], is the next step towards a better understanding of the effect of gravity on the states of quantum fields.

We obtain a supersymmetric Kaluza-Klein black lens solution in Taub-NUT space in the five-dimensional minimal ungauged supergravity. It is shown that the spacetime has a degenerate horizon with the spatial cross section of the lens space topology $L(n,1)=S^3/{\mathbb{Z}}_n$ and looks like the four-dimensional Minkowski spacetime in the neighborhood of spatial infinity. In contrast to the horizon topology, from a five-dimensional point of view, the spatial infinity has the topology of $S^3$ rather than the lens space, for which this solution has an asymptotically flat limit. We discuss several properties of such a black lens, in particular, the effect by the compactification of an extra dimension and some physical differences from the asymptotically flat supersymmetric black lens, which has recently been found.

Recently, two of us have found a family of singularity-free rotating black hole solutions in Einstein’s conformal gravity. These spacetimes are characterized by three parameters: the black hole mass $M$, the black hole spin angular momentum $J$, and a parameter $L$ that is not specified by the theory but can be expected to be proportional to the black hole mass $M$. The Kerr black hole solution of Einstein’s gravity is recovered for $L=0$. In a previous paper, we showed that X-ray data of astrophysical black holes require $L/M<1.2$. In the present paper, we report the results of a more sophisticated analysis. We apply the X-ray reflection model relxill_nk to NuSTAR and Swift data of the supermassive black hole in 1H0707–495. We find the constraint $L/M<0.45$ (90% confidence level).

Dark matter particles gravitationally bound to our Galaxy should exhibit a characteristic speed distribution limited by their escape velocity at the position of Earth ($v_{\mathrm{esc}}\simeq 550\mathrm{km}/\mathrm{s}$). An ongoing search for anomalous cosmic rays at Earth, kinematically similar to cold dark matter, is described. The technique can discriminate between these and known slow-moving particles such as neutrons, would be sensitive to telltale signatures from presently unexplored candidates, and offers the possibility of identifying the mediating type of interaction (nuclear vs electron recoils). Studies of background identification and abatement in a shallow underground site are presented. The expected reach of the method is discussed, and illustrated by obtaining the first limits for dark matter particles lighter than $100\mathrm{MeV}/c^2$ interacting via nuclear recoils.

The search for flavons with a mass of $\mathcal{O}(1)\mathrm{TeV}$ at current and future colliders might probe low-scale flavor models. We are interested in the simplest model that invokes the Froggatt-Nielsen mechanism with an Abelian flavor symmetry, which includes a Higgs doublet and a Froggatt-Nielsen complex singlet. Assuming a $CP$ conserving scalar potential, there are a $CP$-even $H_F$ and a $CP$-odd $A_F$ flavons with lepton flavor violating (LFV) couplings. The former can mix with the standard-model-like Higgs boson, thereby inducing tree-level LFV Higgs interactions that may be at the reach of the LHC. We study the constraints on the parameter space of the model from low-energy LFV processes, which are then used to evaluate the flavon decay widths and the $gg\to \varphi \to \tau \mu$ ($\varphi =H_F,A_F$) production cross section at hadron colliders. After imposing several kinematic cuts to reduce the standard model main background, we find that for $m_{H_F}$ about 200–350 GeV, the decay $H_F\to \tau \mu$ might be at the reach of the LHC for a luminosity in the range $1–3{\mathrm{ab}}^{-1}$, however, a luminosity of the order of $10{\mathrm{ab}}^{-1}$ would be required to detect the $A_F\to \tau \mu$ decay. On the other hand, a future 100 TeV $pp$ collider could probe masses as high as $\mathcal{O}(10)\mathrm{TeV}$ if it reaches an integrated luminosity of at least $20{\mathrm{ab}}^{-1}$. Therefore, the 100 TeV Collider could work as a flavon factory.

We study the lepton flavor violating (LFV) $e(\mu )-\tau$ conversion in deep inelastic scattering (DIS) of electrons (muons) on fixed-target nuclei. Our model-independent analysis is based on the set of low-energy effective four-fermion LFV operators composed of leptons and quarks with the corresponding mass scales ${\mathrm{\Lambda }}_k$ for each operator. Using the estimated sensitivity of the search for this LFV process in events with large missing energy in the NA64 experiment at the CERN SPS, we derive lower limits for ${\mathrm{\Lambda }}_k$ and compared them with the corresponding limits existing in the literature. We show that the DIS $e(\mu )-\tau$ conversion is able to provide a plenty of new limits as yet nonexisting in the literature. We also analyzed the energy spectrum of the final-state $\tau$ and discussed the viability of the observation of this process in the NA64 experiment and ones akin to it. The case of polarized beams and targets is also discussed.

Building upon the fundamental partial compositeness framework, we provide consistent and potentially complete composite extensions of the Standard Model. These are used to determine the effective operators emerging at the electroweak scale in terms of the standard model fields upon consistently integrating out the heavy composite dynamics. We exhibit the first effective field theories matching these composite theories of flavor and analyze their physical consequences for the third generation quarks. Relations with other approaches, ranging from effective analyses for partial compositeness to extra dimensions as well as purely fermionic extensions, are briefly discussed. Our methodology is applicable to any composite theory of dynamical electroweak symmetry breaking featuring a complete theory of flavor.

The prediction of single-spin asymmetry in inelastic photoproduction of $J/\psi$ in $e{p}^{\uparrow }$ collision is presented. At next-to-leading order, the dominating process is photon-gluon fusion, $\gamma +g\to J/\psi +g$ for the production of $J/\psi$ in $e+p^{\uparrow }\to J/\psi +X$, which directly probes the gluon Sivers function. Using the nonrelativistic QCD based color octet model, the color octet states ${{}^{3}S}_1^{(8)}$, ${{}^{1}S}_0^{(8)}$ and ${{}^{3}P}_{J(0,1,2)}^{(8)}$ contribution to $J/\psi$ production is calculated. Sizable asymmetry is estimated as a function of transverse momentum $P_T$ and energy fraction $z$ of $J/\psi$ in the range $0<P_T\le 1\mathrm{GeV}$ and $0.3<z\le 0.9$. The unpolarized differential cross section of inelastic $J/\psi$ photoproduction is found to be in good agreement with H1 and ZEUS data.