Phys. Lett. B

A search for long-lived particles was performed with data corresponding to an integrated luminosity of 2.6 fb −1 collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2015. The analysis exploits two customized topological trigger algorithms, and uses the multiplicity of displaced jets to search for the presence of a signal decay occurring at distances between 1 and 1000 mm. The results can be interpreted in a variety of different models. For pair-produced long-lived particles decaying to two b quarks and two leptons with equal decay rates between lepton flavors, cross sections larger than 2.5 fb are excluded for proper decay lengths between 70–100 mm for a long-lived particle mass of 1130 GeV at 95% confidence. For a specific model of pair-produced, long-lived top squarks with R-parity violating decays to a b quark and a lepton, masses below 550–1130 GeV are excluded at 95% confidence for equal branching fractions between lepton flavors, depending on the squark decay length. This mass bound is the most stringent to date for top squark proper decay lengths greater than 3 mm.

Phys. Rev. D

The process e+e-→Ds*+Ds0*(2317)-+c.c. is observed for the first time with the data sample of 567  pb-1 collected with the BESIII detector operating at the BEPCII collider at a center-of-mass energy s=4.6  GeV. The statistical significance of the Ds0*(2317)± signal is 5.8σ and the mass is measured to be (2318.3±1.2±1.2)  MeV/c2. The absolute branching fraction B(Ds0*(2317)±→π0Ds±) is measured as 1.00−0.14+0.00(stat)−0.14+0.00(syst) for the first time. The uncertainties are statistical and systematic, respectively.

Phys. Lett. B

A search for gauge-mediated supersymmetry (SUSY) in final states with photons and large missing transverse momentum is presented. The data sample of pp collisions at s=13TeV was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 35.9 fb −1 . Data are compared with models in which the lightest neutralino has bino- or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape detection. The event selection is optimized for both electroweak (EWK) and strong production SUSY scenarios. The observed data are consistent with standard model predictions, and limits are set in the context of a general gauge mediation model in which gaugino masses up to 980 GeV are excluded at 95% confidence level. Gaugino masses below 780 and 950 GeV are excluded in two simplified models with EWK production of mass-degenerate charginos and neutralinos. Stringent limits are set on simplified models based on gluino and squark pair production, excluding gluino (squark) masses up to 2100 (1750) GeV depending on the assumptions made for the decay modes and intermediate particle masses. This analysis sets the highest mass limits to date in the studied EWK models, and in the considered strong production models when the mass difference between the gauginos and the squarks or gluinos is small.

Phys.Part.Nucl.

Borexino is continuing to take data and presenting the new results. The most recent Borexino results are discussed and plans for the nearest future are presented.

Phys. Part. Nucl.

We suggest a possible explanation of the reactor antineutrino anomaly derived from a covariant quantum field-theoretical approach to neutrino oscillations. Some disadvantages of the currently prevailing interpretation of the anomaly, based upon the sterile neutrino hypothesis are pointed out.

Fiz.Elem.Chast.Atom.Yadra

The differential cross section of the reaction pp → {pp}$_{s}$ π$^{0}$, where {pp}$_{s}$ is the proton pair in the$^{1}$ S$_{0}$ state at a small excitation energy E$_{pp}$ < 3 MeV, is calculated using the box diagram with the excitation of the Δ-isobar. The model demonstrates a clear bump observed in the experimental data at the beam energy of ∼0.6 GeV and the zero diproton outgoing angle, however, its absolute value strongly depends on the off-shell extrapolation of the πNΔ vertex factor and underestimates the data.

Phys.Part.Nucl.

This article presents the development of the A.M. Baldin approach using a description relativistic nuclear interactions in the four velocity space. This approach allows one to perform calculations of pion yields in hadron-hadron interactions in the central rapidity region depending on the transverse momentum. Results of our calculations have coincided with experimental data in a wide energy range with high precision. This approach gives a good description of the experimental results at high (LHC) and at lower energies (the Nuclotron).

Fiz.Elem.Chast.Atom.Yadra

The old and new experimental studies of dibaryon resonances are reviewed, and their results are interpreted theoretically. Main emphasis is made on the research in this and related areas of relativistic nuclear physics carried out at the Joint Institute for Nuclear Research (JINR) in Dubna, starting from its foundation in mid-1950s. The dibaryon studies are shown to be pivotal for JINR together with the research in such related areas as the cumulative processes, subthreshold production of mesons, single and double pion production in NN collisions, and short-range NN correlations in nuclei.

J.Phys.Conf.Ser.

The MAJORANA DEMONSTRATOR is a 76Ge-based neutrinoless double-beta decay (0νββ) experiment. Staged at the 4850 ft level of the Sanford Underground Research Facility, the DEMONSTRATOR operates an array of high-purity p-type point contact Ge detectors deployed within a graded passive shield and an active muon veto system. The present work concerns the two-neutrino double-beta decay mode (2νββ) of 76Ge. For Ge detectors, having superior energy resolution (0.1%), this mode poses negligible background to the 0νββ mode, even for a ton-scale experiment. However, the measurement of the 2νββ mode allows for careful systematics checks of active detector mass, enrichment fraction, and pulse shape discrimination cuts related to both the 0νββ and 2νββ decay modes. A precision measurement of the 2νββ shape also allows searches for spectral distortions, possibly indicative of new physics, including 0νββχ. Work is underway to construct a full experimental background model enabling a Bayesian fit to the measured energy spectrum and extraction of a precise 2νββ spectrum and half-life.

Eur. Phys. J. C

We consider the production of $J/\psi $ and $\psi (2S)$ mesons originating from the decays of b-flavored hadrons at the LHC using the $k_T$ -factorization approach. Our analysis covers both inclusive charmonia production and production of $J/\psi $ mesons in association with Z bosons. We apply the transverse momentum dependent (or unintegrated) gluon density in a proton derived from Catani–Ciafaloni–Fiorani–Marchesini (CCFM) evolution equation and adopt fragmentation functions based on the non-relativistic QCD factorization to describe the inclusive b-hadron decays into the different charmonium states. Our predictions agree well with latest experimental data taken by the CMS, ATLAS and LHCb Collaborations at $\sqrt{s} = 7$ , 8 and 13 TeV. The contributions from double parton scattering to the associated non-prompt $J/\psi + Z$ production are estimated and found to be small.

Phys. Lett. B

Event-by-event fluctuations in the elliptic-flow coefficient v2 are studied in PbPb collisions at sNN=5.02  TeV using the CMS detector at the CERN LHC. Elliptic-flow probability distributions p(v2) for charged particles with transverse momentum 0.3