Showing papers in "Physics Letters B in 2015"

TL;DR: The first direct search for lepton-flavour-violating decays of the recently discovered Higgs boson (H) is described in this paper, where the search is performed in the H→μτ_e and H→mτ_h channels, where τeτe and τ_h are tau leptons reconstructed in the electronic and hadronic decay channels, respectively.

TL;DR: In this paper, the Taub-NUT solution in gravity has a double Kerr-Schild form, whose electric and magnetic charges are related to the mass and NUT charge in the gravity theory.

TL;DR: A novel strategy constructed to overcome the limitations of currently available reduction programs based on Laporta's algorithm is presented, to construct algebraic identities from numerical samples obtained from reductions over finite fields.

TL;DR: In this paper, it was shown that a new charged current operator can appear, and this can explain the R (D ( ⁎ ) ) puzzle, and a more precise measurement of the double ratio R ( D )/R ( D ⁵ ) can rule out this model.

TL;DR: The first results of a direct search for dark matter operating in the underground Laboratori Nazionali del Gran Sasso (LNGS) and searching for the rare nuclear recoils possibly induced by weakly interacting massive particles (WIMPs) were reported in this paper.

TL;DR: Pentaquark baryons are a natural expectation of an extended picture of hadrons where quarks and diquarks are the fundamental units and the parity/mass pattern observed, when compared to that of exotic mesons, appears as the footprint of a compact five-quark structure as discussed by the authors.

TL;DR: In this article, the authors derived constraints on the minimal model of dark matter comprised of long-lived vector states V (dark photons) in the 0.01 −100 keV 100 keV mass range.

TL;DR: In this article, a jettiness-subtraction scheme was proposed to provide the complete calculation of Higgs boson production in association with a jet in hadronic collisions through next to next-to-leading order in perturbative QCD.

TL;DR: In this paper, the authors describe the pentaquark candidates P c + ( 4380 ) and P c+ ( 4450 ) in terms of a confined but rapidly separating color-antitriplet diquark cu and color-triplet triquark cu.

TL;DR: Bimetric theory describes gravitational interactions in the presence of an extra spin-2 field as discussed by the authors, and previous work has suggested that its cosmological solutions are generically plagued by instabilities.

TL;DR: In this article, it was shown that the renormalisation-group-invariant running-interaction predicted by contemporary analyses of QCD's gauge sector coincides with that required in order to describe Gro und-state hadron observables using a nonperturbative truncation of Dyson-Schwinger equations in the matter sector.

TL;DR: In this paper, the crossover line between the quark gluon plasma and the hadron gas phases for small real chemical potentials is presented, and the authors show that there is an approximate agreement between values from three different observables: the chiral susceptibility, chiral condensate and strange quark susceptibility.

TL;DR: In this paper, it was shown that the spontaneous breaking of B − L is accomplished by a singlet scalar field carrying two units of B−L charge, which results in a very natural implementation of the Majorana seesaw mechanism for neutrinos.

TL;DR: In this paper, the cross section and differential distributions for the production of a Standard Model Higgs boson in association with a hadronic jet to next-to-next-to leading order in quantum chromodynamics (QCD) were computed.

TL;DR: In this article, a new model of large field inflation along a winding trajectory in the field space of two axionic fields, where the "axions" originate from the complex structure moduli sector of a Calabi-Yau 3-fold at large complex structure.

TL;DR: In this paper, it was shown that the higher-order perturbative corrections, beyond leading logarithmic accuracy, to the BFKL evolution in QCD at high energy are well known to suffer from a severe lack-of-convergence problem, due to radiative corrections enhanced by double collinear logARithms.

TL;DR: In this paper, a 19.7 inverse femtobarn sample of proton-proton collisions at 8 TeV was collected with the CMS detector at the CERN LHC.

TL;DR: In this paper, a model-independent search for a narrow resonance produced in proton-proton collisions at square root(s) = 8 TeV and decaying to a pair of 125 GeV Higgs bosons that in turn each decays into bottom quark-antiquark pairs is performed by the CMS experiment at the LHC.

TL;DR: In this article, it was shown that asymptotically locally Lifshitz space-times are holographically dual to field theories that exhibit Schrodinger invariance.

TL;DR: In this paper, the authors extracted the pion form factor of the measured cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation.

TL;DR: In this article, the authors investigated whether Higgs inflation can occur in the Standard Model starting from natural initial conditions or not, and showed that the renormalization for large non-minimal coupling requires an additional degree of freedom, unless a tuning of the initial values of the running parameters is made.

TL;DR: In this article, the transverse momentum (p(T)) spectrum and nuclear modification factor of reconstructed jets in 0-10% and 10-30% central Pb-Pb collisions at root s(NN) = 2.76 TeV were measured.

TL;DR: In this article, a collinearly-improved version of the BK equation is presented, which resums to all orders the radiative corrections enhanced by large double transverse logarithms.

TL;DR: In this article, the temperature dependence of the heavy quark drag coefficient has been investigated and it has been shown that for the same R A A (p T ) one can generate 2-3 times more v 2 depending on the temperature dependent of heavy quarks drag coefficient.

TL;DR: In this article, the effect of QCD radiative effects on the boosted kinematics at the LHC has been investigated and it is shown that the inclusion of the NNLO corrections is crucial to control the pT spectrum of the Higgs boson candidate.

TL;DR: In this article, a search for a heavy, CP-odd Higgs boson decaying into a Z boson and a 125 GeV h, with the ATLAS detector at the LHC is presented.

TL;DR: Focusing on the contribution to the NNLO Drell–Yan K-factor arising from real–virtual interference, the method of regions is used to classify all relevant contributions up to next-to-leading power in the threshold expansion, and the origin of the soft-collinear interference which breaks simple soft-gluon factorisation at next- to-eikonal level is identified.

TL;DR: In this article, the composite nature of the P c ( 4450 ) resonance observed by LHCb was analyzed and the present data suggest that this state is almost entirely made of a χ c 1 and a proton, due to the close proximity to this threshold.

TL;DR: In this paper, the authors showed that at higher energies, a similar explanation would violate the Heisenberg principle, since the calculations based on the uncertainty principle lead to a charmonium formation time expected to be larger than the nuclear radius, which results in identical nuclear break-up probability for the ψ ( 2 S ) and J / ψ.

TL;DR: In this article, the authors investigated whether the 2.6σ deviation from lepton flavour universality in B + → K + l + l − decays recently observed at the LHCb experiment can be explained in minimal composite Higgs models.