The conventional ways to calculate the perturbative component of the DIS singlet structure function \(F_1\) involve approaches based on BFKL which account for the single-logarithmic contributions accompanying the Born factor 1 / x. In contrast, we account for the double-logarithmic (DL) contributions unrelated to 1 / x and because of that they were disregarded as negligibly small...

Using effective field theoretical methods, we show that besides the already observed gravitational waves, quantum gravity predicts two further massive classical fields leading to two new massive waves. We set a limit on the masses of these new modes using data from the Eöt-Wash experiment. We point out that the existence of these new states is a model independent prediction of...

We have considered the Pauli–Zeldovich mechanism for the cancellation of the ultraviolet divergences in vacuum energy. This mechanism arises because bosons and fermions give contributions of the opposite signs. In contrast with the preceding papers devoted to this topic wherein mainly free fields were studied, here we have taken their interactions into account to the lowest order...

Weakly Interacting Massive Particles (WIMPs) are among the best-motivated dark matter candidates. No conclusive signal, despite an extensive search program that combines, often in a complementary way, direct, indirect, and collider probes, has been detected so far. This situation might change in near future due to the advent of one/multi-TON Direct Detection experiments. We thus...

Supersymmetric \(\text {AdS}_{4}\), \(\text {AdS}_{2} \times \Sigma _{2}\) and asymptotically \(\hbox {AdS}_{4}\) black hole solutions are studied in the context of non-minimal \(\mathcal {N}=2\) supergravity models involving three vector multiplets (STU-model) and Abelian gaugings of the universal hypermultiplet moduli space. Such models correspond to consistent subsectors of...

In this paper we indicate a possibility of utilizing the elastic scattering of Dirac low-energy (\(\sim 1\) MeV) electron neutrinos (\(\nu _e\)s) on a polarized electron target (PET) in testing the time reversal symmetry violation (TRSV). We consider a scenario in which the incoming \(\nu _e\) beam is a superposition of left chiral (LC) and right chiral (RC) states. LC \(\nu _e...

Inspired by the peak structure observed by recent DAMPE experiment in \(e^+e^-\) cosmic-ray spectrum, we consider a scalar dark matter (DM) model with gauged \(U(1)_{L_e-L_\mu }\) symmetry, which is the most economical anomaly-free theory to potentially explain the peak by DM annihilation in nearby subhalo. We utilize the process \(\chi \chi \rightarrow Z^\prime Z^\prime...

Action for the Dirac spinor field coupled to gravity on noncommutative (NC) Moyal-Weyl spacetime is obtained without prior knowledge of the metric tensor. We emphasize gauge origins of gravity and its interaction with fermions by demonstrating that a classical action invariant under SO(2, 3) gauge transformations can be exactly reduced to the Dirac action in curved spacetime...

We construct the twist operator for the Snyder space. Our starting point is a non-associative star product related to a Hermitian realisation of the noncommutative coordinates originally introduced by Snyder. The corresponding coproduct of momenta is non-coassociative. The twist is constructed using a general definition of the star product in terms of a bi-differential operator...

We present a new approach for the f(R, T) gravity formalism, by thoroughly exploring the extra terms of its effective energy-momentum tensor \(T_{\mu \nu }^\mathrm{eff}\), which we name \(\tilde{T}_{\mu \nu }\), so that \(T_{\mu \nu }^\mathrm{eff}=T_{\mu \nu }+\tilde{T}_{\mu \nu }\), with \(T_{\mu \nu }\) being the usual energy-momentum tensor of matter. Purely from the Bianchi...

Beyond the Einstein–Maxwell model, electromagnetic field might couple with gravitational field through the Weyl tensor. In order to provide one of the missing puzzles of the whole physical picture, we investigate weak deflection lensing for photons coupled to the Weyl tensor in a Schwarzschild black hole under a unified framework that is valid for its two possible polarizations...

The differential cross-section for the production of a W boson in association with a top quark is measured for several particle-level observables. The measurements are performed using \({36.1}\,\text {fb}^{-1}\) of pp collision data collected with the ATLAS detector at the LHC in 2015 and 2016. Differential cross-sections are measured in a fiducial phase space defined by the...

Phenomenological studies performed for non-supersymmetric extensions of the Standard Model usually use tree-level parameters as input to define the scalar sector of the model. This implicitly assumes that a full on-shell calculation of the scalar sector is possible – and meaningful. However, this doesn’t have to be the case as we show explicitly at the example of the Georgi...

The existence of charged Higgs boson(s) is inevitable in models with two (or more) Higgs doublets. Hence, their discovery would constitute unambiguous evidence for new physics beyond the Standard Model (SM). Taking into account all relevant results from direct charged and neutral Higgs boson searches at LEP and the LHC, as well as the most recent constraints from flavour physics...

Previous quantum field estimations of the QCD vacuum in the expanding space-time lead to a dark energy component scaling linearly with the Hubble parameter, which gives the correct figure for the observed cosmological term. Here we show that this behaviour also appears at the classical level, as a result of the chiral symmetry breaking in a low energy, effective \(\sigma \)-model...

In a simplified model including an SU(2) singlet T quark with charge 2/3, we investigate the single vector-like T production at the high energy \(e\gamma \) collision. We study the observability of the vector-like T focusing on the \(T\rightarrow Wb\) decay channel with \(W\rightarrow l\bar{\nu }\) at \(\sqrt{s}=2.0\) TeV. In this analysis, only two free parameters are involved...

In this work we study the impact that the ghost sector of pure Yang–Mills theories may have on the generation of a dynamical gauge boson mass scale, which hinges on the appearance of massless poles in the fundamental vertices of the theory, and the subsequent realization of the well-known Schwinger mechanism. The process responsible for the formation of such structures is itself...

By means of lattice calculations, center vortices have been established as the infrared dominant gauge field configurations of Yang–Mills theory. In this work, we investigate an ensemble of center vortices in D = 3 Euclidean space-time dimension where they form closed flux loops. To account for the properties of center vortices detected on the lattice, they are equipped with...

We calculate the transverse momentum dependent gluon-to-gluon splitting function within \(k_T\)-factorization, generalizing the framework employed in the calculation of the quark splitting functions in Hautmann et al. (Nucl Phys B 865:54-66, arXiv:1205.1759, 2012), Gituliar et al. (JHEP 01:181, arXiv:1511.08439, 2016), Hentschinski et al. (Phys Rev D 94(11):114013, arXiv:1607...

We study the asymptotically flat quasi-local black hole/hairy black hole model with nonzero mass of the scalar field. We disclose effects of the scalar mass on transitions in a grand canonical ensemble with condensation behaviors of the parameter \(\psi _{2}\), which is similar to approaches in holographic theories. We find that a more negative scalar mass makes the phase...

A local and gauge invariant gauge field model including Nambu–Jona-Lasinio (NJL) and QCD Lagrangian terms in its action is introduced. Surprisingly, it becomes power counting renormalizable. This occurs thanks to the presence of action terms which modify the quark propagators, to become more decreasing that the Dirac one at large momenta in a Lee–Wick form, implying power...

The modification of the production of \(J/\psi \), \(\psi (2\mathrm {S})\), and \(\varUpsilon (n\mathrm {S})\) (\(n = 1, 2, 3\)) in p+Pb collisions with respect to their production in pp collisions has been studied. The p+Pb and pp datasets used in this paper correspond to integrated luminosities of \(28~\mathrm {nb}^{-1}\) and \(25~\mathrm {pb}^{-1}\) respectively, collected in...

In the framework of a 3-3-1 model with right-handed neutrinos and three scalar triplets we consider different spontaneous symmetry breaking patterns seeking for a non-linear realization of accidental symmetries of the model, which will produce physical Nambu–Goldstone (NG) bosons in the neutral scalar spectrum. We make a detailed study of the safety of the model concerning the NG...

This paper presents a measurement of the polarisation of \(\tau \) leptons produced in \(Z/\gamma ^{*}\rightarrow \tau \tau \) decays which is performed with a dataset of proton—proton collisions at \(\sqrt{s}=8\) TeV, corresponding to an integrated luminosity of 20.2 fb\(^{-1}\) recorded with the ATLAS detector at the LHC in 2012. The \(Z/\gamma ^{*}\rightarrow \tau \tau...

The thin-shell wormhole created using the Darmois–Israel formalism applied to Robinson–Trautman family of spacetimes is presented. The stress energy tensor created on the throat is interpreted in terms of two dust streams and it is shown that asymptotically this wormhole settles to the Schwarzschild wormhole with a throat located at the position of the horizon. This behavior...