In the present work, we propose to search the charmonium-like states \(Z_c(3900\)) and \(Z_c(4020)\) in the \(B_c\) decay. In an effective Lagrangian approach, the branching ratios of \(B_c^+ \rightarrow Z_c(3900)^+ \pi ^0\) and \(B_c^+\rightarrow Z_c (4020)^+ \pi ^0\) are estimated to be of order of \(10^{-4}\) and \(10^{-7}\), respectively. The large production rate of \(Z_c...

We shall construct the Dirac-Born-Infeld like and the Wess–Zumino like actions for a dynamical Dp-brane with the U(1) gauge potential and the Kalb–Ramond background field. The brane dynamics simultaneously has both tangential and transverse components. Our calculations will be in the context of the type II superstring theory, via the boundary state formalism.

In this short note we wonder about the explicit expression of the expanding of the p-th Lovelock product. We use the 1990s’ works of S. A. Fulling et al. on the symmetries of the Riemann tensor, and we show that the number of independent scalars appearing in this expanding is equal to the number of Young diagrams with all row lengths even in the decomposition of the p-th plethysm...

The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam at a future neutrino factory or muon collider. The emittance is measured from an ensemble of muons assembled from those that pass through the experiment. A pure muon ensemble is selected using a...

In this work two new families of non-singular or regular black hole solutions are displayed. These black holes behave as de Sitter space near its center and have a well defined AdS asymptotic region for negative cosmological constant. These solutions are constructed on a general ground through the introduction of a finite density of mass/energy. This removes the usual singularity...

Dirac linear spinor fields were obtained from non-linear Heisenberg spinors, in the literature. Here we extend that idea by considering not only Dirac spinor fields but spinor fields in any of the Lounesto’s classes. When one starts considering all these classes of fields, the question of providing a classification for the Heisenberg spinor naturally arises. In this work the...

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...

We obtained constraints on a 12 parameter extended cosmological scenario including non-phantom dynamical dark energy (NPDDE) with CPL parametrization. We also include the six \(\Lambda \)CDM parameters, number of relativistic neutrino species (\(N_{\text {eff}}\)) and sum over active neutrino masses (\(\sum m_{\nu }\)), tensor-to-scalar ratio (\(r_{0.05}\)), and running of the...

BasisGen is a Python package for the automatic generation of bases of operators in effective field theories. It accepts any semisimple symmetry group and fields in any of its finite dimensional irreducible representations. It takes into account integration by parts redundancy and, optionally, the use of equations of motion. The implementation is based on well-known methods to...

In this paper we give a generating function for solutions of the type of collapse mentioned in the title. It satisfies a simple Riccati equation, derived from a formula, which holds in the interior of the star. The generating function is unique, unlike in the neutral case. Every neutral solution has a charged companion with the same generating function. The charged solution has...

We find an argument related to the existence of a \(\mathbb {Z}_2\)-symmetry for the renormalization group flow derived from the bare Yang–Mills Lagrangian, and show that the cancellation of the vacuum energy may arise motivated both from the renormalization group flow solutions and the effective Yang–Mills action. In the framework of the effective Savvidy’s action, two Mirror...

We consider a probe stable meson in the holographic quark–gluon plasma at zero temperature and chemical potential. Due to the energy injection into the plasma, the temperature and chemical potential are increased to arbitrary finite values in such a way that the plasma experiences an out-of-equilibrium process. We then observe that the meson is excited, i.e. the expectation value...

We perform threshold resummation of soft gluon corrections to the total cross sections and the invariant mass distributions for production of a top-antitop quark pair associated with a heavy electroweak boson \(V = W^+\), \(W^-\) or Z in pp collisions at the Large Hadron Collider. The resummation is carried out at next-to-next-to-leading-logarithmic (NNLL) accuracy using the...

We study the propagation of photons in a homogeneous axion dark matter background. When the axion decay into two photons is stimulated, the photon field exhibits a parametric instability in a small bandwidth centered on one half of the axion mass. We estimate analytically the enhancement for both coherent and non-coherent axion fields and we find that this effect could be...

After studying the energy–momentum relation of charged particles’ Hamilton–Jacobi equations, we discuss the laws of thermodynamics and the weak cosmic censorship conjecture in torus-like black holes. We find that both the first law of thermodynamic as well as the weak cosmic censorship conjecture are valid in both the normal phase space and extended phase space. However, the...

Firstly we qualitatively analyze the formation of the dip and peak structures of the kurtosis \(\kappa \sigma ^2\) of net baryon number fluctuation along imagined freeze-out lines and discuss the signature of the existence of the QCD critical end point (CEP) in the Nambu–Jona-Lasinio (NJL) model, Polyakov-NJL (PNJL) model as well as \(\mu \)-dependent PNJL(\(\mu \) PNJL) model...

The Primordial Black Holes (PBHs) are a well-established probe for new physics in the very early Universe. We discuss here the possibility of PBH agglomeration into clusters that may have several prominent observable features. The clusters can form due to closed domain walls appearance in the natural and hybrid inflation models whose subsequent evolution leads to PBH formation...

We study supersymmetric \(AdS_3\times \Sigma _2\) and \(AdS_2\times \Sigma _3\) solutions, with \(\Sigma _2=S^2,H^2\) and \(\Sigma _3=S^3,H^3\), in five-dimensional \(N=4\) gauged supergravity coupled to five vector multiplets. The gauge groups considered here are \(U(1)\times SU(2)\times SU(2)\), \(U(1)\times SO(3,1)\) and \(U(1)\times SL(3,\mathbb {R})\). For \(U(1)\times SU(2...

A slowly rotating black hole solution in Einstein–Maxwell-dilaton gravity is considered. Using the obtained solution we investigate thermodynamic functions such as the black hole’s temperature, entropy and heat capacity. In addition, to examine the thermodynamic properties of the black hole an extended technique is applied. The equation of state of Van der Waals type is obtained...

We study the possibility of future \(e^{+}e^{-}\) colliders to disentangle different new physics contributions to the production of heavy sterile Majorana neutrinos in the lepton number violating channel \(e^{+}e^{-}\rightarrow l^{+} l^{+}+ 4 {\text {jets}}\), with \(l=e, \mu , \tau \). This is done investigating the final anti-tau polarization trails and initial beam...

It has been shown that the spectrum of quantum gravity contains at least two new modes in addition to the massless graviton: a massive spin-0 and a massive spin-2. We calculate their power spectrum during inflation and we argue that they could leave an imprint in the cosmic microwave background should their masses be below the inflationary scale.

Inspired by the recent TOTEM data for the elastic proton–proton (pp) scattering at \(\sqrt{s} =\) 8 and 13 TeV, we update previous studies of the differential cross sections using the Phillips–Barger (PB) model, which parametrizes the amplitude in terms of a small number of free parameters. We demonstrate that this model is able to describe the recent pp data on a statistically...

Prepotential formulation of gauge theories on honeycomb lattice yields local loop states, which are exact and orthonormal being free from any spurious loop degrees of freedom. We illustrate that, the dynamics of orthonormal loop states are exactly same in both the square and honeycomb lattices. We further extend this construction to arbitrary dimensions. Utilizing this result, we...

First results on \(\hbox {K}/\pi \), \(\hbox {p}/\pi \) and K/p fluctuations are obtained with the ALICE detector at the CERN LHC as a function of centrality in \(\text{ Pb--Pb }\) collisions at \(\sqrt{s_\mathrm{{NN}}} =2.76\hbox { TeV}\). The observable \(\nu _{\mathrm{dyn}}\), which is defined in terms of the moments of particle multiplicity distributions, is used to quantify...

The annual modulation measured by the DAMA/LIBRA experiment can be explained by the interaction of dark matter WIMPs in NaI(Tl) scintillator detectors. Other experiments, with different targets or techniques, exclude the region of parameters singled out by DAMA/LIBRA, but the comparison of their results relies on several hypotheses regarding the dark matter model. ANAIS-112 is...