• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-08-03
Xian-Hui Ge, Sang-Jin Sin

We study charged black hole solutions in 4-dimensional (4D) Einstein–Gauss–Bonnet–Maxwell theory to the linearized perturbation level. We first compute the shear viscosity to entropy density ratio. We then demonstrate how bulk causal structure analysis imposes an upper bound on the Gauss–Bonnet coupling constant in the AdS space. Causality constrains the value of Gauss–Bonnet coupling constant $$\alpha 更新日期：2020-08-03 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-08-02 Haveesh Singirikonda, Shantanu Desai In 2012, Bilicki and Seikel (Mon Not R Astron Soc 425:1664, 2012) showed that H(z) data reconstructed using Gaussian Process Regression from cosmic chronometers and baryon acoustic oscillations, conclusively rules out the \(R_h=ct$$ model. These results were disputed by Melia and collaborators in two different works (Melia and Maier in Mon Not R Astron Soc 432:2669, 2013; Melia and Yennapureddy in

更新日期：2020-08-02
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-08-01
S. Acharya, D. Adamová, A. Adler, J. Adolfsson, M. M. Aggarwal, G. Aglieri Rinella, M. Agnello, N. Agrawal, Z. Ahammed, S. Ahmad, S. U. Ahn, A. Akindinov, M. Al-Turany, S. N. Alam, D. S. D. Albuquerque, D. Aleksandrov, B. Alessandro, H. M. Alfanda, R. Alfaro Molina, B. Ali, Y. Ali, A. Alici, A. Alkin, J. Alme, T. Alt, L. Altenkamper, I. Altsybeev, M. N. Anaam, C. Andrei, D. Andreou, H. A. Andrews,

This paper presents the measurements of $$\pi ^{\pm }$$, $$\mathrm {K}^{\pm }$$, $$\text {p}$$ and $$\overline{\mathrm{p}}$$ transverse momentum ($$p_{\text {T}}$$) spectra as a function of charged-particle multiplicity density in proton–proton (pp) collisions at $$\sqrt{s}\ =\ 13\ \text {TeV}$$ with the ALICE detector at the LHC. Such study allows us to isolate the center-of-mass energy dependence

更新日期：2020-08-02
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-08-01
Wei Liang, Qi-Fang Lü

Inspired by the newly observed $$\Lambda _b(6072)$$ structure, we investigate its strong decay behaviors under various assignments within the $$^3P_0$$ model. Compared with the mass and total decay width, our results suggest that the $$\Lambda _b(6072)$$ can be regarded as the lowest $$\rho$$-mode excitation in $$\Lambda _b$$ family. Then, the strong decays of $$\rho$$-mode nonstrange partners for

更新日期：2020-08-01
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-08-01

The results of a search for electroweakino pair production $$pp \rightarrow \tilde{\chi }^\pm _1 \tilde{\chi }^0_2$$ in which the chargino ($$\tilde{\chi }^\pm _1$$) decays into a W boson and the lightest neutralino ($$\tilde{\chi }^0_1$$), while the heavier neutralino ($$\tilde{\chi }^0_2$$) decays into the Standard Model 125 GeV Higgs boson and a second $$\tilde{\chi }^0_1$$ are presented. The signal

更新日期：2020-08-01
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-08-01
Cristian Moreno-Pulido, Joan Solà Peracaula

The $$\Lambda$$-term in Einstein’s equations is a fundamental building block of the ‘concordance’ $$\Lambda$$CDM model of cosmology. Even though the model is not free of fundamental problems, they have not been circumvented by any alternative dark energy proposal either. Here we stick to the $$\Lambda$$-term, but we contend that it can be a ‘running quantity’ in quantum field theory (QFT) in curved

更新日期：2020-08-01
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-31
S. V. Trofymenko, I. V. Kyryllin

The ionization loss spectra of high-energy negatively charged particles which move in the planar channeling mode in a silicon crystal are studied with the use of numerical simulation. The case when the crystal thickness is on the order of the dechanneling length $$l_d$$ is considered. It is shown that in this case the shape of the spectrum noticeably depends on $$l_d$$. The evolution of various characteristic

更新日期：2020-07-31
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-31
Shahar Hod

We analyze a gedanken experiment in which a spinning particle that also possesses an extrinsic orbital angular momentum is captured by a spinning Kerr black hole. The gravitational spin-orbit interaction decreases the energy of the particle, thus allowing one to test the validity of the Penrose weak cosmic censorship conjecture in extreme situations that have not been analyzed thus far. It is explicitly

更新日期：2020-07-31
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-31
Dawit Belayneh, Federico Carminati, Amir Farbin, Benjamin Hooberman, Gulrukh Khattak, Miaoyuan Liu, Junze Liu, Dominick Olivito, Vitória Barin Pacela, Maurizio Pierini, Alexander Schwing, Maria Spiropulu, Sofia Vallecorsa, Jean-Roch Vlimant, Wei Wei, Matt Zhang

Using detailed simulations of calorimeter showers as training data, we investigate the use of deep learning algorithms for the simulation and reconstruction of single isolated particles produced in high-energy physics collisions. We train neural networks on single-particle shower data at the calorimeter-cell level, and show significant improvements for simulation and reconstruction when using these

更新日期：2020-07-31
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-30
Mirko Serino

We present an explicit momentum space computation of the four-point function of the energy-momentum tensor in 4 spacetime dimensions for the free and conformally invariant theory of a scalar field. The result is obtained by explicit evaluation of the Feynman diagrams by tensor reduction. We work by embedding the scalar field theory in a gravitational background consistently with conformal invariance

更新日期：2020-07-31
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-30
Shi-Chen Xue, Xiaoyu Wang, De-Min Li, Zhun Lu

We apply the transverse momentum dependent factorization formalism to investigate the transverse single spin dependent Collins asymmetry with a $$\sin (\phi _h+\phi _s)$$ modulation in the semi-inclusive production of Kaon meson in deep inelastic scattering process. The asymmetry is contributed by the convolutions of the transversity distribution function $$h_1(x)$$ of the target proton and the Collins

更新日期：2020-07-30
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-29
A. Doff, A. A. Natale

We discuss fermion mass generation in unified models where QCD and technicolor (or any two strongly interacting theories) have their Schwinger–Dyson equations coupled. In this case the technicolor (TC) and QCD self-energies are modified in comparison with the behavior observed in the isolated theories. In these models the pseudo-Goldstone boson masses are much higher than the ones obtained in different

更新日期：2020-07-29
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-29
Suresh C. Jaryal

This paper presents a class of exact spherical symmetric solutions of the Einstein equations admitting heat-conducting anisotropic fluid as a collapsing matter. The exterior spacetime is assumed to be the Vaidya metric. This class of solutions is shown to satisfy all the energy conditions throughout the interior of the star, and the luminosity is time independent, radiating uniformly throughout the

更新日期：2020-07-29
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-28
E. Bagli, L. Bandiera, G. Cavoto, V. Guidi, L. Henry, D. Marangotto, F. Martinez Vidal, A. Mazzolari, A. Merli, N. Neri, J. Ruiz Vidal, A. Sytov, V. Tikhomirov

In this Erratum, an improved simulation of the channeling efficiency of protons and antiprotons as a function of the particle momentum is shown in for different configurations

更新日期：2020-07-28
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-28
Ashutosh Kumar Alok, Amol Dighe, Shireen Gangal, Dinesh Kumar

The lepton flavor universality violating (LFUV) measurements $$R_K$$ and $$R_{K^*}$$ in B meson decays can be accounted for in non-universal $$Z'$$ models. We constrain the couplings of these $$Z'$$ models by performing a global fit to correlated $$b \rightarrow s \ell \ell$$ and $$b \rightarrow d \ell \ell$$ processes, and calculate their possible implications for $$B_s \rightarrow {\bar{K}}^*\ell 更新日期：2020-07-28 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-28 M. Asadi We study the volume prescription of the holographic subregion complexity in a holographic 5-dimensional model consisting of Einstein gravity coupled to a scalar field with a non-trivial potential. The dual 4-dimensional gauge theory is not conformal and exhibits a RG flow between two different fixed points. In both zero and finite temperature we show that the holographic subregion complexity can be 更新日期：2020-07-28 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-27 Hao Xu, Yen Chin Ong Hořava–Lifshitz (HL) gravity was formulated in hope of solving the non-renormalization problem in Einstein gravity and the ghost problem in higher derivative gravity theories by violating Lorentz invariance. In this work we consider the spherically symmetric neutral AdS black hole evaporation process in HL gravity in various spacetime dimensions d, and with detailed balance violation parameter \(0\leqslant 更新日期：2020-07-28 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-27 Matteo Rinaldi Double parton distribution functions (dPDFs), entering the double parton scattering (DPS) cross section, are unknown fundamental quantities encoding new interesting properties of hadrons. Here, the pion dPDFs are investigated within different holographic QCD quark models in order to access their basic features. Results of the calculations obtained within the AdS/QCD soft-wall approach, have been compared 更新日期：2020-07-28 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-27 Geovanny A. Rave Franco, Celia Escamilla-Rivera, Jackson Levi Said In this paper we study cosmological solutions of the f(T, B) gravity using dynamical system analyses. For this purpose, we consider cosmological viable functions of f(T, B) that are capable of reproducing the dynamics of the Universe. We present three specific models of f(T, B) gravity which have a general form of their respective solutions by writing the equations of motion as an autonomous system 更新日期：2020-07-27 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-25 Alejandro Jiménez-Cano In this paper we explore generalizations of metric structures of the gravitational wave type to geometries containing an independent connection. The aim is simply to establish a new category of connections compatible, according to some criteria, to the known metric structures for gravitational waves and, additionally, provide some properties that can be useful for the search of solutions of this kind 更新日期：2020-07-25 • Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-25 E. Armengaud, C. Augier, A. S. Barabash, F. Bellini, G. Benato, A. Benoît, M. Beretta, L. Bergé, J. Billard, Yu. A. Borovlev, Ch. Bourgeois, M. Briere, V. Brudanin, P. Camus, L. Cardani, N. Casali, A. Cazes, M. Chapellier, F. Charlieux, M. de Combarieu, I. Dafinei, F. A. Danevich, M. De Jesus, L. Dumoulin, K. Eitel, E. Elkhoury, F. Ferri, B. K. Fujikawa, J. Gascon, L. Gironi, A. Giuliani, V. D. Grigorieva We report the measurement of the two-neutrino double-beta (\(2\nu \beta \beta$$) decay of $$^{100}$$Mo to the ground state of $$^{100}$$Ru using lithium molybdate ($$\hbox {Li}_2^{\;\;100}\hbox {MoO}_4$$) scintillating bolometers. The detectors were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory (France). From a total

更新日期：2020-07-25
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-25
Mariusz P. Da̧browski, Fabian Wagner

We present a formalism which allows for the perturbative derivation of the Extended Uncertainty Principle (EUP) for arbitrary spatial curvature models and observers. Entering the realm of small position uncertainties, we derive a general asymptotic EUP. The leading 2nd order curvature induced correction is proportional to the Ricci scalar, while the 4th order correction features the 0th order Cartan

更新日期：2020-07-25
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-25
Bobir Toshmatov, Ozodbek Rahimov, Bobomurat Ahmedov, Daniele Malafarina

The assumption of asymptotic flatness for isolated astrophysical bodies may be considered an approximation when one considers a cosmological context where a cosmological constant or vacuum energy is present. In this framework we study the motion of spinning particles in static, spherically symmetric and asymptotically non-flat spacetimes with repulsive cosmological vacuum energy and quintessential

更新日期：2020-07-25
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-25
L. R. Dai, L. Roca, E. Oset

We study the $$\tau \rightarrow \nu _\tau A$$ decay, with A an axial-vector meson. We produce the $$a_1(1260)$$ and $$b_1(1235)$$ resonances in the Cabibbo favored mode and two $$K_1(1270)$$ states in the Cabibbo suppressed mode. We take advantage of previous chiral unitary approach results where these resonances appear dynamically from the vector and pseudoscalar meson interaction in s-wave. Actually

更新日期：2020-07-25
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24
Shuang Li, Jinfeng Liao

Heavy quark production provides a unique probe of the quark-gluon plasma transport properties in heavy ion collisions. Experimental observables like the nuclear modification factor $$R_\mathrm{AA}$$ and elliptic anisotropy $$v_\mathrm{2}$$ of heavy flavor mesons are sensitive to the heavy quark diffusion coefficient. There now exist an extensive set of such measurements, which allow a data-driven extraction

更新日期：2020-07-25
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24
N. Aizawa, Z. Kuznetsova, F. Toppan

$${{\mathbb {Z}}}_2\times {{\mathbb {Z}}}_2$$-graded mechanics admits four types of particles: ordinary bosons, two classes of fermions (fermions belonging to different classes commute among each other) and exotic bosons. In this paper we construct the basic $${{\mathbb {Z}}}_2\times {{\mathbb {Z}}}_2$$-graded worldline multiplets (extending the cases of one-dimensional supersymmetry) and compute,

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24
Aliaksei Kachanovich, Ulrich Nierste, Ivan Nišandžić

We consider a Higgs portal model in which the 125-GeV Higgs boson mixes with a light singlet mediator $$h_2$$ coupling to particles of a Dark Sector and study potential $$b\rightarrow s h_2$$ decays in the Belle II experiment. Multiplying the gauge-dependent off-shell Standard-Model b-s-Higgs vertex with the sine of the Higgs mixing angle does not give the correct b-s-$$h_2$$ vertex. We clarify this

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24

A recent analysis from the PHENIX collaboration of available direct photon measurement results in collisions of various systems such as Au+Au, Cu+Cu, and Pb+Pb, at different beam energies ranging from 39 to 2760 GeV, has shown a universal, within experimental uncertainties, multiplicity scaling, in which direct photon $$p_{T}$$-spectra for transverse momenta up to 2 GeV/c are scaled with charged hadron

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24
J. D. Dantas, J. J. Rodrigues

We study cosmological models involving a single real scalar field that has an equation of state parameter which evolves with cosmic time. We highlight some common parametrizations for the equation of state as a function of redshift in the context of twinlike theories. The procedure is used to introduce different models that have the same acceleration parameter, with the very same energy densities and

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24
R. Panth, J. Liu, I. Abt, X. Liu, O. Schulz, W.-Z. Wei, H. Mei, D.-M. Mei, G.-J. Wang

For the first time, planar high-purity germanium detectors with thin amorphous germanium contacts were successfully operated directly in liquid nitrogen and liquid argon in a cryostat at the Max-Planck-Institut für Physics in Munich. The detectors were fabricated at the Lawrence Berkeley National Laboratory and the University of South Dakota, using crystals grown at the University of South Dakota.

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-24
M. Abbrescia, C. Avanzini, M. Arlandoo, G. Balbi, L. Baldini, R. Baldini Ferroli, G. Batignani, M. Battaglieri, S. Boi, D. Cavazza, E. Bossini, F. Carnesecchi, C. Cicalò, L. Cifarelli, F. Coccetti, E. Coccia, A. Corvaglia, D. De Gruttola, S. De Pasquale, F. Fabbri, D. Falchieri, A. Flammini, L. Galante, M. Garbini, G. Gemme, I. Gnesi, E. Gramstad, S. Grazzi, E. S. Håland, D. Hatzifotiadou, P. La Rocca

The goal of the PolarquEEEst experiment was to measure the cosmic charged particle rate at latitudes greater than 66$$^{\circ }$$ N, where no systematic and accurate measurements at sea level have ever been performed. A latitude range well above the Arctic Circle was explored on board of a sailboat, up to the unprecedented northernmost value of $$82^{\circ }07^{\prime }$$ N. In this paper a description

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-23
Andrea Coccaro, Maurizio Pierini, Luca Silvestrini, Riccardo Torre

We introduce the DNNLikelihood, a novel framework to easily encode, through deep neural networks (DNN), the full experimental information contained in complicated likelihood functions (LFs). We show how to efficiently parametrise the LF, treated as a multivariate function of parameters of interest and nuisance parameters with high dimensionality, as an interpolating function in the form of a DNN predictor

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-23
Atanu Bhatta, Shankhadeep Chakrabortty, Suat Dengiz, Ercan Kilicarslan

In this work, we perform a holographic analysis to study non local observables associated to a uniformly boosted strongly coupled large N thermal plasma in d-dimensions. In order to accomplish the holographic analysis, the appropriate dual bulk theory turns out to be $$d+1$$ dimensional boosted AdS-Schwarzschild blackhole background. In particular, we compute entanglement entropy of the boosted plasma

更新日期：2020-07-24
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-23
Ke Yang, Bao-Min Gu, Shao-Wen Wei, Yu-Xiao Liu

A novel four-dimensional Einstein-Gauss-Bonnet gravity was formulated by Glavan and Lin (Phys. Rev. Lett. 124:081301, 2020), which is intended to bypass the Lovelock’s theorem and to yield a non-trivial contribution to the four-dimensional gravitational dynamics. However, the validity and consistency of this theory has been called into question recently. We study a static and spherically symmetric

更新日期：2020-07-23
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-23
Wolfgang Gregor Hollik, Matthias Linster, Mustafa Tabet

Searches for New Physics focus either on the direct production of new particles at colliders or at deviations from known observables at low energies. In order to discover New Physics in precision measurements, both experimental and theoretical uncertainties must be under full control. Laser spectroscopy nowadays offers a tool to measure transition frequencies very precisely. For certain molecular and

更新日期：2020-07-23
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22
Mert Ergen, Efe Hamamcı, Dieter Van den Bleeken

In the original version of this article, the last name of the second author missed its last letter.

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22
Özcan Sert, Fatma Çeliktaş

We use Noether symmetry approach to find spherically symmetric static solutions of the non-minimally coupled electromagnetic fields to gravity. We construct the point-like Lagrangian under the spherical symmetry assumption. Then we determine Noether symmetry and the corresponding conserved charge. We derive Euler-Lagrange equations from this point-like Lagrangian and show that these equations are same

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22
Trambak Bhattacharyya, Abhik Mukherjee

We study the propagation of energy density perturbation in a hot, ideal quark–gluon medium in which quarks and gluons follow the Tsallis-like momentum distributions. We have observed that a non-extensive MIT bag equation of state obtained with the help of the quantum Tsallis-like distributions gives rise to a breaking wave solution of the equation dictating the evolution of energy density perturbation

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22
Arie Bodek, Tejin Cai

Precise modeling of neutrino interactions on nuclear targets is essential for neutrino oscillations experiments. The modeling of the energy of final state particles in quasielastic (QE) scattering and resonance production on bound nucleons requires knowledge of both the removal energy of the initial state bound nucleon as well as the average Coulomb and nuclear optical potentials for final state leptons

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22

Motivated by the holographic self-tuning proposal of the cosmological constant, we generalize and study the cosmology of brane-worlds embedded in a higher-dimensional bulk black hole geometry. We describe the equations and matching conditions in the case of flat, spherical and hyperbolic slicing of the bulk geometry and find the conditions for the existence of a static solution. We solve the equations

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22
Yang Huang, Hongsheng Zhang

Wave propagations in the presence of black holes is a significant problem both in theoretical and observational aspects, especially after the discovery of gravitational wave and confirmation of black holes. We study the scattering of massless scalar field by a charged dilatonic black hole in frame of full wave theory. We apply partial wave method to obtain the scattering cross sections of the scalar

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-22
Fotis Farakos, George Tringas, Thomas Van Riet

We discuss flux compactifications of IIA string theory on G2 holonomy spaces with O2/O6-planes to three dimensions and find two classes of solutions: (1) No-scale Minkowski vacua from NSNS 3-form fluxes and RR 4-form fluxes. (2) By adding Romans mass we find AdS$$_3$$ vacua for which the AdS scale can be decoupled completely from the KK scale while the solution is at tunable weak coupling and large

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-21
Hui-Ling Li, Xiao-Xiong Zeng, Rong Lin

In the framework of holography, we discuss on the phase transition behavior from a novel Gauss–Bonnet AdS black hole discovered in [Phys. Rev. Lett. 124, 081301 (2020)] in both charged and neutral cases. First, we explore the thermodynamic behavior for the black hole entropy by investigating $$T-S$$ diagram, specific heat capacity and free energy, and we find that, in the $$T-S$$ plane, the black hole

更新日期：2020-07-22
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-21
Jinmian Li, Tianjun Li, Junle Pei, Wenxing Zhang

We for the first time obtain the analytical solution for the quirk equation of motion in an approximate way. Based on it, we study several features of quirk trajectory in a more precise way, including quirk oscillation amplitude, number of periods, as well as the thickness of quirk pair plane. Moreover, we find an exceptional case where the quirk crosses at least one of the tracking layers repeatedly

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-21
David Pérez Carlos, Augusto Espinoza, Andrew Chubykalo

The purpose of this paper is to get second-order gravitational equations, a correction made to Jefimenko’s linear gravitational equations. These linear equations were first proposed by Oliver Heaviside in [1], making an analogy between the laws of electromagnetism and gravitation. To achieve our goal, we will use perturbation methods on Einstein field equations. It should be emphasized that the resulting

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-21
Sheng-Quan Wang, Rui-Qing Meng, Xing-Gang Wu, Long Chen, Jian-Ming Shen

The bottom quark forward–backward asymmetry $$A_\mathrm{{FB}}$$ is a key observable in electron–positron collisions at the $$Z^{0}$$ peak. In this paper, we employ the Principle of Maximum Conformality (PMC) to fix the $$\alpha _s$$-running behavior of the next-to-next-to-leading order QCD corrections to $$A_\mathrm{{FB}}$$. The resulting PMC scale for this $$A_\mathrm{{FB}}$$ is an order of magnitude

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-20
Metin Gürses, Tahsin Çağrı Şişman, Bayram Tekin

No! We show that the field equations of Einstein–Gauss–Bonnet theory defined in generic $$D>4$$ dimensions split into two parts one of which always remains higher dimensional, and hence the theory does not have a non-trivial limit to $$D=4$$. Therefore, the recently introduced four-dimensional, novel, Einstein–Gauss–Bonnet theory does not admit an intrinsically four-dimensional definition, in terms

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-20
A. V. Nikolaev, S. D. Maharaj

The Vaidya metric is important in describing the exterior spacetime of a radiating star and for describing astrophysical processes. In this paper we study embedding properties of the generalized Vaidya metric. We had obtained embedding conditions, for embedding into 5-dimensional Euclidean space, by two different methods and solved them in general. As a result we found the form of the mass function

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-20
F. F. Faria

First, we obtain the plane wave solution of the linearized massive conformal gravity field equations. It is shown that the theory has seven physical plane waves. In addition, we investigate the gravitational radiation from binary systems in massive conformal gravity. We find that the theory with large graviton mass can reproduce the orbit of binaries by the emission of gravitational waves.A preprint

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-20
Kamal Krishna Nath, Ritam Mallick

General relativistic effects are essential in defining the spacetime around massive astrophysical objects. The effects can be captured using a test gyro. If the gyro rotates at some fixed orbit around the star, then the gyro precession frequency captures all the general relativistic effects. In this article, we calculate the overall precession frequency of a test gyro orbiting a rotating neutron star

更新日期：2020-07-21
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-20
Nicolas R. Bertini, Wiliam S. Hipólito-Ricaldi, Felipe de Melo-Santos, Davi C. Rodrigues

更新日期：2020-07-20
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-19
Maria Caruana, Gabriel Farrugia, Jackson Levi Said

Teleparallel Gravity offers the possibility of reformulating gravity in terms of torsion by exchanging the Levi-Civita connection with the Weitzenböck connection which describes torsion rather than curvature. Surprisingly, Teleparallel Gravity can be formulated to be equivalent to general relativity for a appropriate setup. Our interest lies in exploring an extension of this theory in which the Lagrangian

更新日期：2020-07-20
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-19
Felix Schlüter, Marvin Gottowik, Tim Huege, Julian Rautenberg

The footprint of radio emission from extensive air showers is known to exhibit asymmetries due to the superposition of geomagnetic and charge-excess radiation. For inclined air showers a geometric early-late effect disturbs the signal distribution further. Correcting CoREAS simulations for these asymmetries reveals an additional disturbance in the signal distribution of highly inclined showers in atmospheres

更新日期：2020-07-20
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-19
J. Jones-Pérez, J. Masias, J. D. Ruiz-Álvarez

The charged current production of long-lived heavy neutrinos at the LHC can use a prompt charged lepton for triggering the measurement of the process. However, in order to fully characterize the heavy neutrino interactions, it is necessary to also probe Higgs or Z mediated neutral current production. In this case the charged lepton is not available, so other means of triggering are required. In this

更新日期：2020-07-20
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-19
Andrei Angelescu, Darius A. Faroughy, Olcyr Sumensari

Starting from a general effective Lagrangian for lepton flavor violation (LFV) in quark-lepton transitions, we derive constraints on the effective coefficients from the high-mass tails of the dilepton processes $$pp \rightarrow \ell _k \ell _l$$ (with $$k\ne l$$). The current (projected) limits derived in this paper from LHC data with $$36~\mathrm {fb}^{-1}$$ ($$3~\mathrm {ab}^{-1}$$) can be applied

更新日期：2020-07-20
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-18
Andrea Donini, Pilar Hernández, Carlos Pena, Fernando Romero-López

We study the scaling of kaon decay amplitudes with the number of colours, $$N_c$$, in a theory with four degenerate flavours, $$N_f=4$$. In this scenario, two current-current operators, $$Q^\pm$$, mediate $$\Delta S=1$$ transitions, such as the two isospin amplitudes of non-leptonic kaon decays for $$K\rightarrow (\pi \pi )_{I=0,2}$$, $$A_0$$ and $$A_2$$. In particular, we concentrate on the simpler

更新日期：2020-07-18
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-18
L. Herrera-Zamorano, A. Hernández-Almada, Miguel A. García-Aspeitia

In this work, we study two scenarios of the Universe filled by a perfect fluid following the traditional dark energy and a viscous fluid as dark matter. In this sense, we explore the most simple case for the viscosity in the Eckart formalism, a constant, and then, a polynomial function of the redshift. We constrain the phase-space of the model parameters by performing a Bayesian analysis based on Markov

更新日期：2020-07-18
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-18
Sergiu I. Vacaru

This work consists an introduction to the classical and quantum information theory of geometric flows of (relativistic) Lagrange–Hamilton mechanical systems. Basic geometric and physical properties of the canonical nonholonomic deformations of G. Perelman entropy functionals and geometric flows evolution equations of classical mechanical systems are described. There are studied projections of such

更新日期：2020-07-18
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-17
Cláudio Gomes

The weak field limit of the nonminimally coupled Boltzmann equation is studied, and relations between the invariant Bardeen scalar potentials are derived. The Jean’s criterion for instabilities is found through the modified dispersion relation. Special cases are scrutinised and considerations on the model parameters are discussed for Bok globules.

更新日期：2020-07-17
• Eur. Phys. J. C (IF 4.389) Pub Date : 2020-07-17
J. Kalinowski, W. Kotlarski, P. Sopicki, A. F. Żarnecki

One of the important goals of the proposed future $$\hbox {e}^{+}\hbox {e}^{-}$$ collider experiments is the search for dark matter particles using different experimental approaches. The most general search approach is based on the mono-photon signature, which is expected when production of the invisible final state is accompanied by a hard photon from initial state radiation. Analysis of the energy

更新日期：2020-07-17
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