The existence of a minimum length in quantum gravity is investigated by computing the in-in expectation value of the proper distance in the Schwinger–Keldysh formalism. No minimum geometrical length is found for arbitrary gravitational theories to all orders in perturbation theory. Using non-perturbative techniques, we also show that neither the conformal sector of general relativity nor higher-derivative

In the study of perturbations around black hole configurations, whether an external source can influence the perturbation behavior is an interesting topic to investigate. When the source acts as an initial pulse, it is intuitively acceptable that the existing quasinormal frequencies will remain unchanged. However, the confirmation of such an intuition is not trivial for the rotating black hole, since

Higgs boson properties are studied in the four-lepton decay channel (where lepton = e, \(\mu \)) using 139 \(\hbox {fb}^{-1}\) of proton–proton collision data recorded at \(\sqrt{s}=\)13 TeV by the ATLAS experiment at the Large Hadron Collider. The inclusive cross-section times branching ratio for \(H\rightarrow ZZ^*\) decay is measured to be \(1.34 \pm 0.12\) pb for a Higgs boson with absolute rapidity

Spectrometers based on the magnetic adiabatic collimation followed by an electrostatic filter (MAC-E-filter) principle combine high angular acceptance with an excellent energy resolution. These features make MAC-E-filters very valuable for experiments where the kinetic energy of ions or electrons from rare processes has to be measured with utmost sensitivity and precision. Examples are direct neutrino

A number of near-extremal conditions are utilized to simplify the equation of motion of the neutral scalar perturbations in generalized spherically symmetric black hole background into a differential equation with the Pöschl–Teller potential. An analytic formula for quasinormal frequencies is obtained. The analytic formula is then used to investigate strong cosmic censorship conjectures (SCC) of the

We show that solutions of the self-similar gravitational collapse in the Einstein-axion–dilaton system exist in higher-dimensional spacetimes. These solutions are invariant under spacetime dilation combined with internal SL(2,\(\mathbb {R}\)) transformations. We rely on the recent setup of Antonelli and Hatefi (JHEP 03:074, arXiv:1912.00078 [hep-th], 2020) and use it for the three different conjugacy

For static black holes in Einstein gravity, if matter fields satisfy a few general conditions, we conjecture that three characteristic parameters about the spatial size of black holes, namely the outermost photon sphere area \(A_{\mathrm {ph,out}}\), the corresponding shadow area \(A_{\mathrm {sh,out}}\) and the horizon area \(A_{{\mathcal {H}}}\) satisfy a series of universal inequalities \(9A_{{\mathcal

The ladder kernel of the Bethe–Salpeter equation is amended by introducing a different flavor dependence of the dressing functions in the heavy-quark sector. Compared with earlier work this allows for the simultaneous calculation of the mass spectrum and leptonic decay constants of light pseudoscalar mesons, the \(D_u\), \(D_s\), \(B_u\), \(B_s\) and \(B_c\) mesons and the heavy quarkonia \(\eta _c\)

For the first time, electrical conduction mechanisms in the disordered material system is experimentally studied for p-type amorphous germanium (a-Ge) used for high-purity Ge detector contacts. The localization length and the hopping parameters in a-Ge are determined using the surface leakage current measured from three high-purity planar Ge detectors. The temperature dependent hopping distance and

We provide updated predictions for the hadronic decays \(\bar{B}_s^0\rightarrow D_s^{(*)+} \pi ^-\) and \(\bar{B}^0\rightarrow D^{(*)+} K^-\). They are based on \({\mathcal {O}}(\alpha _s^2)\) results for the QCD factorization amplitudes at leading power and on recent results for the \(\bar{B}_{(s)} \rightarrow D_{(s)}^{(*)}\) form factors up to order \(\mathcal{O}(\Lambda _\mathrm{QCD}^2/m_c^2)\)

In this paper, we tentatively assign \(Z_{c}(3900)\) to be an axialvector molecular state, and calculate its magnetic moment using the QCD sum rule method in an external weak electromagnetic field. Starting with the two-point correlation function in the external electromagnetic field and expanding it in powers of the electromagnetic interaction Hamiltonian, we extract the mass and pole residue of the

We continue the study of compactifications of massive IIA supergravity on G2 orientifolds and demonstrate that breaking supersymmetry with anti-D2 and anti-D6 sources leads to 3d theories for which the typical tachyons haunting classical dS solutions can be absent. However for a concrete torus example the meta-stable dS window disappears after a quantization of fluxes and charges. We discuss the prospects

The physical and mathematical properties of the non-linearly coupled black-hole-orbiting-ring system are studied analytically to second order in the dimensionless angular velocity \(M_{\text {ir}}\omega _{\text {H}}\) of the black-hole horizon (here \(M_{\text {ir}}\) is the irreducible mass of the slowly rotating central black hole). In particular, we determine analytically, to first order in the

We work out in the forward limit and up to order \(e^6\) in perturbation theory the collinear divergences. In this kinematical regime we discover new collinear divergences that we argue can be only cancelled using quantum interference with processes contributing to the gauge anomaly. This rules out the possibility of a quantum consistent and anomaly free theory with massless charges and long range

We systematically study hidden-charm pentaquark currents with the quark configurations \([\bar{c} u][u d c]\), \([\bar{c} d][u u c]\), and \([\bar{c} c][u u d]\). Some of their relations are derived using the Fierz rearrangement of the Dirac and color indices, and the obtained results are used to study strong decay properties of \(P_c\) states as \(\bar{D}^{(*)} \varSigma _c\) hadronic molecules. We

This erratum concerns the corrections of Equations (49) and (52).

We show that the current values of \(R_K^\mathrm {exp}\) and \(R_{K^*}^\mathrm {exp}\) can be accommodated by allowing a nonzero New Physics coupling \(\delta C_9^{\mu \mu }\) to be complex, both in the scenario in which only \(\delta C_9^{\mu \mu }\) is affected, and in the scenario with complex \(\delta C_{9,10}^{\mu \mu }\) satisfying \(\delta C_{9}^{\mu \mu }=-\delta C_{10}^{\mu \mu }\). A presence

Inclusive and differential fiducial cross sections of the Higgs boson are measured in the \(H \rightarrow ZZ^{*} \rightarrow 4\ell \) (\(\ell = e,\mu \)) decay channel. The results are based on proton−proton collision data produced at the Large Hadron Collider at a centre-of-mass energy of 13 TeV and recorded by the ATLAS detector from 2015 to 2018, equivalent to an integrated luminosity of 139 \(\hbox

We present next-to-leading order (NLO) electroweak corrections to the dominant five angular coefficients parametrizing the Drell–Yan process in the Z-boson mass peak range for finite-\(p_T\) vector boson production. The results are presented differentially in the vector boson transverse momentum. The Lam–Tung violating difference \(A_0-A_2\) is examined alongside the coefficients. A single lepton transverse

The mass and decay constants of \(\rho _2,~\omega _2\) and a missing member in the \( 2^{--} \) nonet along with their first excited states are analyzed by the Thermal QCD sum rules approach, including QCD condensates up to dimension five. Mass and decay constant values of these mesons are stable from \(T=0\) up to \(T \cong 120 ~\mathrm {MeV}\). However, after this threshold point, our numerical analyses

We present how to construct elliptically fibered K3 surfaces via Weierstrass models which can be parametrized in terms of Wilson lines in the dual heterotic string theory. We work with a subset of reflexive polyhedras that admit two fibers whose moduli spaces contain the ones of the \(E_{8}\times E_{8}\) or \(\frac{Spin(32)}{{\mathbb {Z}}_{2}}\) heterotic theory compactified on a two torus without

The dynamics of the subatomic fundamental particles, represented by quantum fields, and their interactions are determined uniquely by the assigned transformation properties, i.e., the quantum numbers associated with the underlying symmetry of the model under consideration. These fields constitute a finite number of group invariant operators which are assembled to build a polynomial, known as the Lagrangian

Recent researches of the novel 4D Einstein–Gauss–Bonnet (EGB) gravity have attracted great attention. In this paper, we investigate the validity of the weak cosmic censorship conjecture for a novel 4D charged EGB black hole with test charged scalar field and test charged particle respectively. For the test charged field scattering process, we find that both extremal and near-extremal black holes cannot

We demonstrate that the method of interleaved resampling in the context of parton showers can tremendously improve the statistical convergence of weighted parton shower evolution algorithms. We illustrate this by several examples showing significant statistical improvement.

We report the first measurement of the absolute branching fraction of the inclusive decay \(\Lambda _c^+ \rightarrow K_S^0X\). The analysis is performed using an \(e^+e^-\) collision data sample corresponding to an integrated luminosity of 567 \(\hbox {pb}^{-1}\) taken at \(\sqrt{s}\) = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored \({\bar{\Lambda }}_c^-\) decay modes and the double-tag

The measurement of present-day temperature of the Cosmic Microwave Background (CMB), \(T_0 = 2.72548 \pm 0.00057\) K (1\(\sigma \)), made by the Far-InfraRed Absolute Spectrophotometer (FIRAS) as recalibrated by the Wilkinson Microwave Anisotropy Probe (WMAP), is one of the most precise measurements ever made in Cosmology. On the other hand, estimates of the Hubble Constant, \(H_0\), obtained from

Grand gauge–Higgs unification of five dimensional SU(6) gauge theory on an orbifold \(S^1/Z_2\) with localized gauge kinetic terms is discussed. The Standard model (SM) fermions on one of the boundaries and some massive bulk fermions coupling to the SM fermions on the boundary are introduced, so that they respect an SU(5) symmetry structure. The SM fermion masses including top quark are reproduced

Total travel time t and time delay \(\Delta t\) between images of gravitational lensing (GL) in the equatorial plane of stationary axisymmetric (SAS) spacetimes for null and timelike signals with arbitrary velocity are studied. Using a perturbative method in the weak field limit, t in general SAS spacetimes is expressed as a quasi-series of the impact parameter b with coefficients involving the source-lens

We investigate the quintessence scalar field model modified by the generalized uncertainty principle in the background of a spatially flat homogeneous and isotropic universe. By performing a dynamical system analysis we examine the nature of the critical points and their stability for two potentials, one is the exponential potential and the other is a general potential. In the case of an exponential

Several studies are on-going at CERN in the framework of the Physics Beyond Collider study group, with main aim of broadening the physics research spectrum using the available accelerator complex and infrastructure. The possibility to design a layout that allows fixed-target experiments in the primary vacuum of the CERN Large Hadron Collider (LHC), without the need of a dedicated extraction line, is

In this work we analyse Cherenkov radiation by relativistic muons, positive and negative, channeled in optically transparent diamond and silicon crystals in comparison with ordinary Cherenkov radiation. We have shown that the maxima in the spectral angular distributions for both types of radiation are revealed at the derivative extrema for the media refractive index, while, due to the difference in

In this short note, we propose an algorithm based on the expansions of amplitudes, the dimensional reduction technique and the approach by differential operators, to calculate the tree level scalar–graviton amplitudes with two massive scalars and the tree level scalar–photon–graviton amplitudes with two massive scalars and one photon. While applying the unitarity method, these amplitudes are necessary

The semileptonic transition of \(\varLambda _b\) baryon is studied using the Hypercentral constituent quark model. The six-dimensional hyperradial \(Schr\ddot{o}dinger\) equation is solved in the variational approach to get masses and wavefunctions of heavy baryons. The matrix elements of weak decay are written in terms of the overlap integrals of the baryon wave function. The Isgur-Wise function is

We employ gauge/gravity duality to study the effects of Lifshitz scaling on the holographic p-wave superconductors in the presence of Born–Infeld nonlinear electrodynamics. By using the shooting method in the probe limit, we calculate the relation between critical temperature \(T_\mathrm{{c}}\) and \(\rho ^{z/d}\) numerically for different values of mass, nonlinear parameter b and Lifshitz critical

The particle discovered in the Higgs boson searches at the LHC with a mass of about 125 GeV is compatible within the present uncertainties with the Higgs boson predicted in the Standard Model (SM), but it could also be identified with one of the neutral Higgs bosons in a variety of beyond the SM (BSM) theories with an extended Higgs sector. The possibility that an additional Higgs boson (or even more

We present the results of the new SuperChic 4 Monte Carlo implementation of photon-initiated production in proton–proton collisions, considering as a first example the case of lepton pair production. This is based on the structure function calculation of the underlying process, and focusses on a complete account of the various contributing channels, including the case where a rapidity gap veto is imposed

The critical collapse of a scalar field is a threshold solution of black hole formation, in which a naked singularity arises. We study here the curvature strength of this singularity using a numerical ansatz. The behavior of the Jacobi volume forms is examined along a non-spacelike geodesic in the limit of approach to the singularity. These are seen to be vanishing, thus showing that all physical objects

In this paper, by analyzing the underlyingLefschetz-thimble structure, we investigate quantum phases (or quantum critical points) in zero-dimensional scalar field theories with complex actions. Using first principles, we derive the thimble equations of these models for various values of the coupling parameters. In the thimble decomposition of complex path integrals, determination of the so-called intersection

The T2K collaboration has recently reported their results, which gives the best-fit values of the atmospheric mixing angle \(\sin ^2 \theta _{23} = 0.53\) and the Dirac CP-violating phase \(\delta = -1.89\) for normal neutrino mass ordering. We give a possible theoretical origin of such values based on the \(\mu \)-\(\tau \) reflection symmetry. It has been found that the breaking of such symmetry

Three neutral resonances \(\Xi _c(2923)^0\), \(\Xi _c(2939)^0\), and \(\Xi _c(2965)^0\) have been observed in the \(\Lambda _c^+ K^-\) mass spectrum by the LHCb Collaboration. Given the \(\Xi _c\) and \(\Xi _c^\prime \) mass spectra predicted by the constituent quark models, these three resonances are tentatively treated as the \(\lambda \)-mode \(\Xi _c(2S)\), \(\Xi _c^\prime (2S)\), \(\Xi _c^{\prime

The nature of dark matter (DM) is still a mystery that may indicate the necessity for extensions of the Standard Model (SM). Light dark photons (DP) may comprise partially or entirely the observed DM density and existing limits for the DP DM parameter space arise from several cosmological and astrophysical sources. In the present work we investigate DP DM using cosmic transients, specifically fast

The prediction of additional Higgs bosons is one of the key features of physics beyond the Standard Model (SM) that gives rise to an extended Higgs sector. We assess the sensitivity of the Large Hadron Collider (LHC) in the high luminosity (HL) run alone and in combination with a possible future International Linear Collider (ILC) to probe heavy neutral Higgs bosons. We employ the Minimal Supersymmetric

In the context of CA conjecture for holographic complexity, we study the action growth rate at late time approximation for general quadratic curvature theory of gravity. We show how the Lloyd’s bound saturates for charged and neutral black hole solutions. We observe that a second singular point may modify the action growth rate to a value other than the Lloyd’s bound. Moreover, we find the universal

In the holographic model of Dirac semimetals, the Einstein–Maxwell scalar gravity with the auxiliary U(1)-gauge field, coupled to the ordinary Maxwell one by a kinetic mixing term, the black brane response to the electric fields and temperature gradient has been elaborated. Using the foliation by hypersurfaces of constant radial coordinate we derive the exact form of the Hamiltonian and equations of

In this work, the relative Underlying event (UE) transverse multiplicity activity classifier (\(R_\mathrm{{T}}\)) is used to study the strange and multi-strange hadron production in proton-proton collisions. Our study with \(R_\mathrm{{T}}\) would allow to disentangle these particles, which are originating from the soft and hard QCD processes. We have used the PYTHIA 8 Monte-Carlo (MC) with a different

The modified supergravity approach is applied to describe a formation of Primordial Black Holes (PBHs) after Starobinsky inflation. Our approach naturally leads to the two-(scalar)-field attractor-type double inflation, whose first stage is driven by scalaron and whose second stage is driven by another scalar field which belongs to a supergravity multiplet. The scalar potential and the kinetic terms

This work is devoted to the study of relativistic anisotropic compact objects. To obtain this class of solutions of the Einstein field equations, we have developed a general scheme to generate the metric of the space–time describing the interior of the compact structure. This approach is based on the class I space–time and the extended gravitational decoupling by means of an extended geometric deformation

In this work, we investigate the quasinormal frequencies of a class of regular black hole solutions which generalize Bardeen and Hayward spacetimes. In particular, we analyze scalar, vector and gravitational perturbations of the black hole with the semianalytic WKB method. We analyze in detail the behaviour of the spectrum depending on the parameter p/q of the black hole, the quantum number of angular

We reexamine the minimal Singlet \(+\) Triplet Scotogenic Model, where dark matter is the mediator of neutrino mass generation. We assume it to be a scalar WIMP, whose stability follows from the same \({\mathbb {Z}}_{2}\) symmetry that leads to the radiative origin of neutrino masses. The scheme is the minimal one that allows for solar and atmospheric mass scales to be generated. We perform a full

In this article, a framework for hadronic rescattering in the general-purpose Pythia event generator is introduced. The starting point is the recently presented space–time picture of the hadronization process. It is now extended with a tracing of the subsequent motion of the primary hadrons, including both subsequent scattering processes among them and decays of them. The major new component is cross-section

We present an analysis of two-current correlations for the pion in the Nambu–Jona-Lasinio model, with Pauli–Villars regularization. We provide explicit expressions in momentum space for two-current correlations corresponding to the zeroth component of the vector Dirac bilinear in the quark vertices, which has been evaluated on the lattice, thinking to applications in a high energy framework, as a step

A modified gravitational theory explains early universe and late time cosmology, galaxy and galaxy cluster dynamics. The modified gravity (MOG) theory extends general relativity (GR) by three extra degrees of freedom: a scalar field G, enhancing the strength of the Newtonian gravitational constant \(G_N\), a gravitational, spin 1 vector graviton field \(\phi _\mu \), and the effective mass \(\mu \)

Dense nuclear matter is expected to be anisotropic due to effects such as solidification, superfluidity, strong magnetic fields, hyperons, pion-condensation. Therefore an anisotropic neutron star core seems more realistic than an ideally isotropic one. We model anisotropic neutron stars working in the Krori–Barua (KB) ansatz without preassuming an equation of state. We show that the physics of general

We consider a dark energy scenario driven by a scalar field \(\phi \) with a pseudo-Nambu–Goldstone boson (pNGB) type potential \(V(\phi )=\mu ^4 \left( 1+ \mathrm{cos}(\phi /f) \right) \). The pNGB originates out of breaking of spontaneous symmetry at a scale f close to Planck mass \(M_\mathrm{{pl}}\). We consider two cases namely the quintessence dark energy model with pNGB potential and the other

Both unitary chiral theories and lattice QCD simulations show that the DK interaction is attractive and can form a bound state, namely, \(D^*_{s0}(2317)\). Assuming the validity of the heavy antiquark–diquark symmetry, the \(\Xi _{cc}{\bar{K}}\) interaction is the same as the DK interaction, which implies the existence of a \(\Xi _{cc}{\bar{K}}\) bound state with a binding energy of \(49-64\) MeV.

Under the aegis of isospin conservation, the amplitudes in Born approximation, i.e., considering the only one-photon-exchange mechanism, of the decay \(\psi \rightarrow \Lambda \overline{\Sigma }{}^0+\text {c.c.}\), where \(\psi \) is a vector charmonium, and of the reaction \(e^+e^-\rightarrow \Lambda \overline{\Sigma }{}^0+\text {c.c.}\) at the \(\psi \) mass, are parametrized by the same electromagnetic

Collapsing solutions in f(R) gravity are restricted due to junction conditions that demand continuity of the Ricci scalar and its normal derivative across the time-like collapsing hypersurface. These are obtained via the method of R-matching, which is ubiquitous in f(R) collapse scenarios. In this paper, we study spherically symmetric collapse with the modification term \(\alpha R^2\), and use R-matching

The spatially nonlocal response functions are proposed which nearly coincide with the commonly used local response for electromagnetic fields and fluctuations on the mass shell, but differ significantly for the off-shell fluctuating field. It is shown that the fundamental Lifshitz theory using the suggested response functions comes to an agreement with the measurement data for the Casimir force without

In the original version of this article, the names of four authors were missing in the author list: L. Perasso, O. Pinazza, C. Pinto and S. Pisano.

Using a joint statistical analysis, we test a four-dimensional FLRW model embedded in a five-dimensional bulk based on the Nash-Greene embedding theorem. Performing a Markov Chain Monte Carlo (MCMC) modelling, we combine observational data sets as those of the recent growth data, the best-fit Planck2018/\(\varLambda \)CDM parameters on the Cosmic Microwave Background (CMB), the Baryon Acoustic Oscillations