We present a measurement of form-factor-independent angular observables in the decay B(0)→K*(892)(0)μ(+)μ(-). The analysis is based on a data sample corresponding to an integrated luminosity of 1.0 fb(-1), collected by the LHCb experiment in pp collisions at a center-of-mass energy of 7 TeV. Four observables are measured in six bins of the dimuon invariant mass squared q² in the range 0.1

A search for the rare decays B 0 s ! þ À and B 0 ! þ À is performed at the LHCb experiment. The data analyzed correspond to an integrated luminosity of 1 fb À1 of pp collisions at a center-of-mass energy of 7 TeV and 2 fb À1 at 8 TeV. An excess of B 0 s ! þ À signal candidates with respect to the background expectation is seen with a significance of 4.0 standard deviations. A time-integrated branching fraction of BðB 0 s ! þ À Þ ¼ ð2:9 þ1:1 À1:0 Þ Â 10 À9 is obtained and an upper limit of BðB 0 ! þ À Þ < 7:4 Â 10 À10 at 95% confidence level is set. These results are consistent with the standard model expectations.

The production of J/ψ mesons with rapidity 1.5 < y < 4.0 or −5.0 < y < −2.5 and transverse momentum p T < 14 GeV/c is studied with the LHCb detector in proton-lead collisions at a nucleon-nucleon centre-of-mass energy √ s N N = 5 TeV. The J/ψ mesons are reconstructed using the dimuon decay mode. The analysis is based on a data sample corresponding to an integrated luminosity of about 1.6 nb −1 . For the first time the nuclear modification factor and forward-backward production ratio are determined separately for prompt J/ψ mesons and J/ψ from b-hadron decays. Clear suppression of prompt J/ψ production with respect to proton-proton collisions at large rapidity is observed, while the production of J/ψ from b-hadron decays is less suppressed. These results show good agreement with available theoretical predictions. The measurement shows that cold nuclear matter effects are important for interpretations of the related quark-gluon plasma signatures in heavy-ion collisions.Keywords: Relativistic heavy ion physics, Quarkonium, Heavy quark production, Heavy Ions, Particle and resonance production A Results in tables 13The LHCb collaboration 19 IntroductionThe suppression of heavy quarkonia production with respect to proton-proton (pp) collisions [1] is one of the most distinctive signatures of the formation of quark-gluon plasma, a hot nuclear medium created in ultrarelativistic heavy-ion collisions. However, the suppression of heavy quarkonia and light hadron production with respect to pp collisions can also take place in proton-nucleus (pA) collisions, where a quark-gluon plasma is not expected to be created and only cold nuclear matter effects, such as nuclear absorption, parton shadowing and parton energy loss in initial and final states occur [2][3][4][5][6][7][8]. The study of pA collisions is important to disentangle the effects of quark-gluon plasma from cold nuclear matter, and to provide essential input to the understanding of nucleus-nucleus collisions. Nuclear effects are usually characterised by the nuclear modification factor, defined as the production cross-section of a given particle in pA collisions divided by that in pp collisions and the number of colliding nucleons in the nucleus (given by the atomic number A),where y is the rapidity of the particle in the nucleon-nucleon centre-of-mass frame, p T is the transverse momentum of the particle, and √ s NN is the nucleon-nucleon centre-of-mass energy. The suppression of heavy quarkonia and light hadron production with respect to pp collisions at large rapidity has been observed in pA collisions [9, 10] and in deuterongold collisions [11][12][13], but has not been studied in proton-lead (pPb) collisions at the TeV -1 - JHEP02(2014)072scale. Previous experiments [9][10][11][12][13] have also shown evidence that the production crosssection of J/ψ mesons or light hadrons in the forward region (positive rapidity) of pA or deuteron-gold collisions differs from that in the backward region (negative rapidity), where "forward" and "backward" are define...

The paper discusses edge stability, beta limits and power handling issues for negative triangularity tokamaks. The edge MHD stability is the most crucial item for the power handling. For the case of negative triangularity the edge stability picture is quite different from that for conventional positive triangularity tokamaks: the 2nd stability access is closed for localized Mercier/ballooning modes due to the absence of magnetic well, and nearly internal kink modes set the pedestal height limit weakly sensitive to diamagnetic stabilization just above the margin of localized mode Mercier criterion violation. While negative triangularity tokamak is thought to have low beta limit with its magnetic hill property, it is found that plasmas with reactor relevant values of normalized beta β N > 3 can be stable to global kink modes without wall stabilization with appropriate core pressure profile optimization against localized mode stability and also with increased magnetic shear in the outer half radius. The beta limit is set by n=1 mode for the resulting flat pressure profile. The wall stabilization is very inefficient due to strong coupling between external and internal modes. The n>1 modes are increasingly internal when approaching the localized mode limit and set a lower beta in case of peaked pressure profile leading to Mercier unstable core. With the theoretical predictions supported by experiments, a negative triangularity tokamak would become a perspective fusion energy system with other advantages including larger separatrix wetted area, more flexible divertor configuration design, wider trapped particle free SOL, lower background magnetic field for internal poloidal field coils and larger pumping conductance from the divertor room.

An angular analysis of the decay J/ψ→μ+μ− is performed to measure the polarization of prompt J/ψ mesons produced in pp collisions at . The dataset corresponds to an integrated luminosity of 0.37 fb−1 collected with the LHCb detector. The measurement is presented as a function of transverse momentum, pT, and rapidity, y, of the J/ψ meson, in the kinematic region 2