The European Physical Journal C

http://link.springer.com/journal/10052

List of Papers (Total 3,248)

Generating a resonance-like structure in the reaction \(B_c\rightarrow B_s \pi \pi \)

We investigate the process \(B_c^+\rightarrow B_s^0\pi ^+\pi ^0\) via \(B\bar{K}^*\) rescattering. The kinematic conditions for triangle singularities are perfectly satisfied in the rescattering diagrams. A resonance-like structure around the \(B\bar{K}\) threshold, which we denote X(5777), is predicted to be present in the invariant mass distribution of \(B_s^0 \pi ^+\). Because ...

Testing holographic conjectures of complexity with Born–Infeld black holes

In this paper, we use Born–Infeld black holes to test two recent holographic conjectures of complexity, the “Complexity = Action” (CA) duality and “Complexity = Volume 2.0” (CV) duality. The complexity of a boundary state is identified with the action of the Wheeler–deWitt patch in CA duality, while this complexity is identified with the spacetime volume of the WdW patch in CV ...

A new laser-ranged satellite for General Relativity and space geodesy: III. De Sitter effect and the LARES 2 space experiment

In two previous papers we presented the LARES 2 space experiment aimed at a very accurate test of frame-dragging and at other tests of fundamental physics and measurements of space geodesy and geodynamics. We presented the error sources of the LARES 2 experiment, its error budget and Monte Carlo simulations and covariance analyses confirming an accuracy of a few parts in one ...

Improved thermodynamics of SU(2) gauge theory

In this work we present the results of our investigation of the thermodynamics of SU(2) gauge theory. We employ a Symanzik improved action to reduce strongly the discretisations effects, and we use the scaling relations to take into account the finite volume effects close to the critical temperature. We determine the \(\beta \)-function for this particular theory and we use it in ...

Two particle entanglement and its geometric duals

We show that for a system of two entangled particles, there is a dual description to the particle equations in terms of classical theory of conformally stretched spacetime. We also connect these entangled particle equations with Finsler geometry. We show that this duality translates strongly coupled quantum equations in the pilot-wave limit to weakly coupled geometric equations.

Updated search for long-lived particles decaying to jet pairs

A search is presented for long-lived particles with a mass between 25 and 50\(\,\mathrm{GeV}/c^{2}\) and a lifetime between 2 and 500 ps, using proton–proton collision data corresponding to an integrated luminosity of 2.0\(\,\mathrm{fb}^{-1}\), collected by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. The particles are assumed to be pair-produced in the decay of a ...

Cherenkov and scintillation light separation in organic liquid scintillators

The CHErenkov/Scintillation Separation experiment (CHESS) has been used to demonstrate the separation of Cherenkov and scintillation light in both linear alkylbenzene (LAB) and LAB with 2 g/L of PPO as a fluor (LAB/PPO). This is the first successful demonstration of Cherenkov light detection from the more challenging LAB/PPO cocktail and improves on previous results for LAB. A time ...

Higgs mass prediction in the MSSM at three-loop level in a pure \(\overline{{\text {DR}}}\) context

The impact of the three-loop effects of order \(\alpha _t\alpha _s^2\) on the mass of the light CP-even Higgs boson in the \({\text {MSSM}}\) is studied in a pure \(\overline{{\text {DR}}}\) context. For this purpose, we implement the results of Kant et al. (JHEP 08:104, 2010) into the C++ module Himalaya and link it to FlexibleSUSY, a Mathematica and C++ package to create spectrum ...

Phase transition in anisotropic holographic superfluids with arbitrary dynamical critical exponent z and hyperscaling violation factor \(\alpha \)

Einstein-scalar-U(2) gauge field theory is considered in a spacetime characterized by \(\alpha \) and z, which are the hyperscaling violation factor and the dynamical critical exponent, respectively. We consider a dual fluid system of such a gravity theory characterized by temperature T and chemical potential \(\mu \). It turns out that there is a superfluid phase transition where ...

The effective action of a BPS Alice string

Recently a BPS Alice string has been found in a \(U(1)\times SO(3)\) gauge theory coupled with three charged complex scalar fields in the triplet representation (in JHEP 1709:046 arXiv:​1703.​08971 [hep-th], 2017). It is a half BPS state preserving a half of the supercharges when embedded into a supersymmetric gauge theory. In this paper, we study zero modes of a BPS Alice string. ...

Measurement of lepton differential distributions and the top quark mass in \(t\bar{t}\) production in pp collisions at \(\sqrt{s}=8\) TeV with the ATLAS detector

This paper presents single lepton and dilepton kinematic distributions measured in dileptonic \(t\bar{t}\) events produced in 20.2\(\hbox {fb}^{-1}\) of \(\sqrt{s}=8\) TeV pp collisions recorded by the ATLAS experiment at the LHC. Both absolute and normalised differential cross-sections are measured, using events with an opposite-charge \(e\mu \) pair and one or two b-tagged jets. ...

Bianchi type I expanding universe in Weyl-invariant gravity with a quartic interaction term

We will focus on the effect of a Weyl-invariant model with a quadratic interaction term and a free scalar field \(\psi \). A set of analytic solutions will be obtained for this model. This model provides a dynamical alternative to the standard \(\Lambda \)CDM model. In particular, we will show that the quartic Weyl-invariant model prediction is consistent with the Hubble diagram ...

Towards tomography of quark–gluon plasma using double inclusive forward-central jets in Pb–Pb collision

We propose a new framework, merging High Energy Factorization with final-state jet quenching effects due to interactions in a quark–gluon plasma, to compute di-jet rates at mid-rapidity and forward rapidity. It allows one to consistently study the interplay of initial-state effects with medium interactions, opening the possibility for understanding the dynamics of hard probes in ...

Extracting the top-quark running mass using \(t\bar{t} + \hbox {1-jet}\) events produced at the Large Hadron Collider

We present the calculation of the next-to-leading order QCD corrections for top-quark pair production in association with an additional jet at hadron colliders, using the modified minimal subtraction scheme to renormalize the top-quark mass. The results are compared to measurements at the Large Hadron Collider run I. In particular, we determine the top-quark running mass from a fit ...

Two Higgs doublet models and \(b\rightarrow s\) exclusive decays

We computed the leading order Wilson coefficients relevant to all the exclusive \(b\rightarrow s\ell ^+\ell ^-\) decays in the framework of the two Higgs doublet model (2HDM) with a softly broken \(\mathbb {Z}_2\) symmetry by including the \(\mathcal {O}(m_b)\) corrections. We elucidate the issue of appropriate matching between the full and the effective theory when dealing with ...

Violation of causality in f(T) gravity

In the standard formulation, the f(T) field equations are not invariant under local Lorentz transformations, and thus the theory does not inherit the causal structure of special relativity. Actually, even locally violation of causality can occur in this formulation of f(T) gravity. A locally Lorentz covariant f(T) gravity theory has been devised recently, and this local causality ...

Thermal Casimir effect in Kerr spacetime with quintessence and massive gravitons

Starting from an analytical expression for the Helmholtz free energy we calculate the thermal corrections to the Casimir energy density and entropy within nearby ideal parallel plates in the vacuum of a massless scalar field. Our framework is the Kerr spacetime in the presence of quintessence and massive gravitons. The high and low temperature regimes are especially analyzed in ...

Development of \(^{100}\hbox {Mo}\) -containing scintillating bolometers for a high-sensitivity neutrinoless double-beta decay search

This paper reports on the development of a technology involving \(^{100}\hbox {Mo}\)-enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass (\(\sim 1~\hbox {kg}\)), high optical quality, radiopure \(^{100}\hbox {Mo}\)-containing zinc and lithium molybdate ...

Maxi-sizing the trilinear Higgs self-coupling: how large could it be?

In order to answer the question on how much the trilinear Higgs self-coupling could deviate from its Standard Model value in weakly coupled models, we study both theoretical and phenomenological constraints. As a first step, we discuss this question by modifying the Standard Model using effective operators. Considering constraints from vacuum stability and perturbativity, we show ...

Horndeski gravity and the violation of reverse isoperimetric inequality

We consider Einstein–Horndeski–Maxwell gravity, together with a cosmological constant and multiple Horndeski axions. We construct charged AdS planar black holes in general dimensions where the Horndeski axions span over the planar directions. We analyze the thermodynamics and obtain the black hole volumes. We show that the reverse isoperimetric inequality can be violated, implying ...

FlavBit: a GAMBIT module for computing flavour observables and likelihoods

Flavour physics observables are excellent probes of new physics up to very high energy scales. Here we present FlavBit, the dedicated flavour physics module of the global-fitting package GAMBIT. FlavBit includes custom implementations of various likelihood routines for a wide range of flavour observables, including detailed uncertainties and correlations associated with LHCb ...

GAMBIT: the global and modular beyond-the-standard-model inference tool

We describe the open-source global fitting package GAMBIT: the Global And Modular Beyond-the-Standard-Model Inference Tool. GAMBIT combines extensive calculations of observables and likelihoods in particle and astroparticle physics with a hierarchical model database, advanced tools for automatically building analyses of essentially any model, a flexible and powerful system for ...

Determination of the strong coupling constant \({\varvec{{\alpha _\mathrm{s} (m_\mathrm{Z})}}}\) in next-to-next-to-leading order QCD using H1 jet cross section measurements

The strong coupling constant \(\alpha _\mathrm{s}\) is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. The dependence of the NNLO predictions and of the resulting value of \(\alpha _\mathrm{s} (m_\mathrm{Z})\) at the ...

Decoupling of the leading contribution in the discrete BFKL analysis of high-precision HERA data

We analyse, in NLO, the physical properties of the discrete eigenvalue solution for the BFKL equation. We show that a set of eigenfunctions with positive eigenvalues, \( \omega \), together with a small contribution from a continuum of eigenfunctions with negative \( \omega \), provide an excellent description of high-precision HERA \(F_2\) data in the region, \(x<0.001\), \(Q^2 > ...

Palatini wormholes and energy conditions from the prism of general relativity

Wormholes are hypothetical shortcuts in spacetime that in general relativity unavoidably violate all of the pointwise energy conditions. In this paper, we consider several wormhole spacetimes that, as opposed to the standard designer procedure frequently employed in the literature, arise directly from gravitational actions including additional terms resulting from contractions of ...