The European Physical Journal C

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

List of Papers (Total 2,454)

Measurement of the \({\varvec{t\bar{t}Z}}\) and \({\varvec{t\bar{t}W}}\) production cross sections in multilepton final states using 3.2 fb \(^{-1}\) of \(\varvec{pp}\) collisions at \(\sqrt{s}\) = 13 TeV with the ATLAS detector

A measurement of the \(t\bar{t}Z\) and \(t\bar{t}W\) production cross sections in final states with either two same-charge muons, or three or four leptons (electrons or muons) is presented. The analysis uses a data sample of proton–proton collisions at \(\sqrt{s} = 13\) TeV recorded with the ATLAS detector at the Large Hadron Collider in 2015, corresponding to a total integrated ...

\(\Lambda _b \rightarrow \pi ^- (D_s^-) \Lambda _c(2595),~\pi ^- (D_s^-) \Lambda _c(2625)\) decays and \(DN,~D^*N\) molecular components

From the perspective that \(\Lambda _c(2595)\) and \(\Lambda _c(2625)\) are dynamically generated resonances from the \(DN,~D^*N\) interaction and coupled channels, we have evaluated the rates for \(\Lambda _b \rightarrow \pi ^- \Lambda _c(2595)\) and \(\Lambda _b \rightarrow \pi ^- \Lambda _c(2625)\) up to a global unknown factor that allows us to calculate the ratio of rates and ...

Compact stars in vector–tensor-Horndeski theory of gravity

In this paper, we will analyze a theory of modified gravity, in which the field content of general relativity will be increased to include a vector field. We will use the Horndeski formalism to non-minimally couple this vector field to the metric. As we will be using the Horndeski formalism, this theory will not contain Ostrogradsky ghost degree of freedom. We will analyze compact ...

Strong decays of \(D_{3}^{*}(2760)\) , \(D_{s3}^{*}(2860)\) , \(B_{3}^{*}\) , and \(B_{s3}^{*}\)

In this paper, we study the OZI-allowed two-body strong decays of \(3^-\) heavy–light mesons. Experimentally the charmed \(D_{3}^{*}(2760)\) and the charm–strange \(D_{s3}^{*}(2860)\) states with these quantum numbers have been discovered. For the bottomed B(5970) state, which was found by the CDF Collaboration recently, its quantum number has not been decided yet and we assume it ...

Cyclic and heteroclinic flows near general static spherically symmetric black holes: semi-cyclic flows – addendum and corrigendum

We present new accretion solutions of a polytropic perfect fluid onto an f(R)-gravity de Sitter-like black hole. We consider two f(R)-gravity models and obtain finite-period cyclic flows oscillating between the event and cosmological horizons as well as semi-cyclic critical flows executing a two-way motion from and back to the same horizon. Besides the generalizations and new ...

Jet azimuthal angle correlations in the production of a Higgs boson pair plus two jets at hadron colliders

Azimuthal angle correlations of two jets in the process \(pp\rightarrow HHjj\) are studied. The loop induced \(\mathcal {O}(\alpha _\mathrm{s}^4 \alpha _{}^2)\) gluon fusion (GF) sub-process and the \(\mathcal {O}(\alpha _{}^4)\) weak boson fusion (WBF) sub-process are considered. The GF sub-process exhibits strong correlations in the azimuthal angles \(\phi _{1,2}^{}\) of the two ...

tWH associated production at the LHC

We study Higgs boson production in association with a top quark and a W boson at the LHC. At NLO in QCD, tWH interferes with \(t\bar{t} H\) and a procedure to meaningfully separate the two processes needs to be employed. In order to define tWH production for both total rates and differential distributions, we consider the diagram removal and diagram subtraction techniques that have ...

Impact of lepton flavor universality violation on CP-violation sensitivity of long-baseline neutrino oscillation experiments

The observation of neutrino oscillation as well as the recent experimental results on lepton flavor universality (LFU) violation in B meson decays are indications of new physics beyond the standard model. Many theoretical models, which are introduced in the literature as an extension of SM to explain these observed deviations in LFU, lead to a new kind of interactions, the ...

Charged-particle multiplicities in proton–proton collisions at \(\sqrt{s} = 0.9\) to 8 TeV

A detailed study of pseudorapidity densities and multiplicity distributions of primary charged particles produced in proton–proton collisions, at \(\sqrt{s} =\) 0.9, 2.36, 2.76, 7 and 8 TeV, in the pseudorapidity range \(|\eta |<2\), was carried out using the ALICE detector. Measurements were obtained for three event classes: inelastic, non-single diffractive and events with at ...

Stability of the Einstein static universe in f(R, T) gravity

The Einstein static (ES) universe has played a major role in various emergent scenarios recently proposed in order to cure the problem of the initial singularity of the standard model of cosmology. In the model we address, we study the existence and stability of an ES universe in the context of f(R, T) modified theories of gravity. Considering specific forms of the f(R, T) ...

Quasinormal modes and thermodynamics of linearly charged BTZ black holes in massive gravity in (anti) de Sitter space-time

In this work we study the Quasi-Normal Modes (QNMs) under massless scalar perturbations and the thermodynamics of linearly charged BTZ black holes in massive gravity in the (Anti)de Sitter ((A)dS) space-time. It is found that the behavior of QNMs changes with the massive parameter of the graviton and also with the charge of the black hole. The thermodynamics of such black holes in ...

On the structure of anomalous composite Higgs models

We describe the anomaly structure of a composite Higgs model in which the SO(5) / SO(4) coset structure of the minimal model is extended by an additional, non-linearly realised \(U(1)_{\eta }\). In addition, we show that the effective Lagrangian admits a term that, like the Wess–Zumino–Witten term in the chiral Lagrangian for QCD, is not invariant under the non-linearly realised ...

Constraints on reconstructed dark energy model from SN Ia and BAO/CMB observations

The motivation of the present work is to reconstruct a dark energy model through the dimensionless dark energy function X(z), which is the dark energy density in units of its present value. In this paper, we have shown that a scalar field \(\phi \) having a phenomenologically chosen X(z) can give rise to a transition from a decelerated to an accelerated phase of expansion for the ...

Minimal spin-3/2 dark matter in a simple s-channel model

We consider a spin-3/2 fermionic dark matter candidate (DM) interacting with Standard Model fermions through a vector mediator in the s-channel. We find that for pure vector couplings almost the entire parameter space of the DM and mediator mass consistent with the observed relic density is ruled out by the direct detection observations through DM-nucleon elastic scattering cross ...

A measurement of the calorimeter response to single hadrons and determination of the jet energy scale uncertainty using LHC Run-1 pp-collision data with the ATLAS detector

A measurement of the calorimeter response to isolated charged hadrons in the ATLAS detector at the LHC is presented. This measurement is performed with 3.2 nb\(^{-1}\) of proton–proton collision data at \(\sqrt{s}=7\) \(\,\mathrm{TeV}\) from 2010 and 0.1 nb\(^{-1}\) of data at \(\sqrt{s}=8\) \(\,\mathrm{TeV}\) from 2012. A number of aspects of the calorimeter response to isolated ...

Joule–Thomson expansion of the charged AdS black holes

In this paper, we study Joule–Thomson effects for charged AdS black holes. We obtain inversion temperatures and curves. We investigate similarities and differences between van der Waals fluids and charged AdS black holes for the expansion. We obtain isenthalpic curves for both systems in the T–P plane and determine the cooling–heating regions.

Search for sterile neutrinos in muon neutrino disappearance mode at FNAL

The NESSiE Collaboration has been setup to undertake a conclusive experiment to clarify the muon-neutrino disappearance measurements at short baselines in order to put severe constraints to models with more than the three-standard neutrinos. To this aim the current FNAL-Booster neutrino beam for a Short-Baseline experiment was carefully evaluated by considering the use of magnetic ...

EBL effect on the observation of multi-TeV flaring of 2009 from Markarian 501

Markarian 501 is a high-peaked BL Lacertae object and has undergone many major outbursts since its discovery in 1996. As a part of the multiwavelength campaign, in the year 2009 this blazar was observed for 4.5 months from March 9 to August 1 and during the period April 17 to May 5 it was observed by both space and ground based observatories covering the entire electromagnetic ...

NNLO QCD corrections to the Drell–Yan cross section in models of TeV-scale gravity

The first results on the complete next-to-next-to-leading order (NNLO) Quantum Chromodynamic (QCD) corrections to the production of di-leptons at hadron colliders in large extra dimension models with spin-2 particles are reported in this article. In particular, we have computed these corrections to the invariant mass distribution of the di-leptons taking into account all the ...

Do nuclear collisions create a locally equilibrated quark–gluon plasma?

Experimental results on azimuthal correlations in high energy nuclear collisions (nucleus–nucleus, proton–nucleus, and proton–proton) seem to be well described by viscous hydrodynamics. It is often argued that this agreement implies either local thermal equilibrium or at least local isotropy. In this note, I present arguments why this is not the case. Neither local near-equilibrium ...

Mass spectra in \({\mathcal {N}}=1\) SQCD with additional colorless but flavored fields

Considered is the \(\mathcal{N}=1\) supersymmetric QCD-like \(\Phi \)-theory with \(SU(N_c)\) colors and \(0< N_F<2N_c\) flavors of light quarks \(Q^i_a,{\overline{Q}}^{\,a}_j\) with equal small masses. In addition to quarks and gluons of the standard \(\mathcal{N}=1\) SQCD, it includes \(N^2_F\) colorless but flavored fields \(\Phi _{i}^{j}\), with the large mass parameter \(\mu ...

Stacked search for time shifted high energy neutrinos from gamma ray bursts with the Antares neutrino telescope

A search for high-energy neutrino emission correlated with gamma-ray bursts outside the electromagnetic prompt-emission time window is presented. Using a stacking approach of the time delays between reported gamma-ray burst alerts and spatially coincident muon-neutrino signatures, data from the Antares neutrino telescope recorded between 2007 and 2012 are analysed. One year of ...

Off-diagonal deformations of Kerr metrics and black ellipsoids in heterotic supergravity

Geometric methods for constructing exact solutions of equations of motion with first order \(\alpha ^{\prime }\) corrections to the heterotic supergravity action implying a nontrivial Yang–Mills sector and six-dimensional, 6-d, almost-Kähler internal spaces are studied. In 10-d spacetimes, general parametrizations for generic off-diagonal metrics, nonlinear and linear connections, ...

Zooming in on \(B\rightarrow K^*\ell \ell \) decays at low recoil

We analyse \(B\rightarrow K^*\ell \ell \) decays in the region of low hadronic recoil, where an operator product expansion (OPE) in \(1/m_b\) applies. Using a local model for charm contributions based on \(e^+ e^- \rightarrow \mathrm{hadrons}\) against the OPE provides a data-driven method to access the limitations to the OPE’s accuracy related to binnings in the dilepton mass. ...

Measurements of the \(\mathrm{t}\overline{\mathrm{t}}\) production cross section in lepton+jets final states in pp collisions at 8 \(\,\text {TeV}\) and ratio of 8 to 7 \(\,\text {TeV}\) cross sections

A measurement of the top quark pair production (\(\mathrm{t}\overline{\mathrm{t}} \)) cross section in proton–proton collisions at the centre-of-mass energy of 8\(\,\text {TeV}\) is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6\(\,\text {fb}^{-\text {1}}\). This analysis is performed in the ...