A search is presented for new particles decaying to large numbers (7 or more) of jets, with missing transverse momentum and no isolated electrons or muons. This analysis uses 20.3 fb −1 of pp collision data at √ s = 8 TeV collected by the ATLAS experiment at the Large Hadron Collider. The sensitivity of the search is enhanced by considering the number of b-tagged jets and the scalar sum of masses of large-radius jets in an event. No evidence is found for physics beyond the Standard Model. The results are interpreted in the context of various simplified supersymmetry-inspired models where gluinos are pair produced, as well as an mSUGRA/CMSSM model. The ATLAS collaboration 34 IntroductionMany extensions of the Standard Model of particle physics predict the presence of TeVscale strongly interacting particles that decay to weakly interacting descendants. In the context of R-parity-conserving supersymmetry (SUSY) [1][2][3][4][5], the strongly interacting parent particles are the partners of the quarks (squarks,q) and gluons (gluinos,g), and are produced in pairs. The lightest supersymmetric particle (LSP) is stable, providing a candidate that can contribute to the relic dark-matter density in the universe [6,7]. If they are kinematically accessible, the squarks and gluinos could be produced in the proton-proton interactions at the Large Hadron Collider (LHC) [8].-1 - JHEP10(2013)130Such particles are expected to decay in cascades, the nature of which depends on the mass hierarchy within the model. The events would be characterised by significant missing transverse momentum from the unobserved weakly interacting descendants, and by a large number of jets from emissions of quarks and/or gluons. Individual cascade decays may include gluino decays to a top squark (stop,t) and an anti-top quark, g →t +t (1.1a)followed by the top-squark decay to a top quark and a neutralino LSP,χ 0 1 , t → t +χ 0 1.(1.1b)Alternatively, if the top squark is heavier than the gluino, the three-body decay, g → t +t +χ 0 1 (1.2) may result. Other possibilities include decays involving intermediate charginos, neutralinos, and/or squarks including bottom squarks. A pair of cascade decays produces a large number of Standard Model particles, together with a pair of LSPs, one from the end of each cascade. The LSPs are assumed to be stable and only weakly interacting, and so escape undetected, resulting in missing transverse momentum. In this paper we consider final states with large numbers of jets together with significant missing transverse momentum in the absence of isolated electrons or muons, using the pp collision data recorded by the ATLAS experiment [9] during 2012 at a centre-of-mass energy of √ s = 8 TeV. The corresponding integrated luminosity is 20.3 fb −1 . Searches for new phenomena in final states with large jet multiplicities -requiring from at least six to at least nine jets -and missing transverse momentum have previously been reported by the ATLAS Collaboration using LHC pp collision data corresponding to 1.34 fb −1 [10]...

Search for a Higgs boson decaying into a Z and a photon in pp collisions at √ s = 7 and 8 TeVThe CMS Collaboration * Abstract A search for a Higgs boson decaying into a Z boson and a photon is described. The analysis is performed using proton-proton collision datasets recorded by the CMS detector at the LHC. Events were collected at center-of-mass energies of 7 TeV and 8 TeV, corresponding to integrated luminosities of 5.0 fb −1 and 19.6 fb −1 , respectively. The selected events are required to have opposite-sign electron or muon pairs. No excess above standard model predictions has been found in the 120-160 GeV mass range and the first limits on the Higgs boson production cross section times the H → Zγ branching fraction at the LHC have been derived. The observed limits are between about 4 and 25 times the standard model cross section times the branching fraction. The observed and expected limits for m γ at 125 GeV are within one order of magnitude of the standard model prediction. Models predicting the Higgs boson production cross section times the H → Zγ branching fraction to be larger than one order of magnitude of the standard model prediction are excluded for most of the 125-157 GeV mass range. The observation of a new resonance decaying to two bosons and with decay modes and properties consistent with those of the standard model (SM) Higgs boson has been reported by the ATLAS [1, 2] and CMS [3, 4] collaborations. Measurements of the basic properties of this resonance, such as the mass [5] and the coupling strength to vector bosons and fermions [1-4, 6], have been reported. Within the SM, the partial width for the H → Zγ decay channel (Γ Zγ ) is rather small, resulting in a branching fraction between 0.11% and 0.25% in the 120-160 GeV [7, 8] mass range. A measurement of Γ Zγ provides important information on the underlying dynamics of the Higgs sector because it is induced by loops of heavy charged particles, just as for the H → γγ decay channel. The contributing diagrams to Γ Zγ are shown in Fig. 1. Γ Zγ is sensitive to physics beyond the SM, and could be substantially modified by new charged particles without affecting the gluon-gluon fusion Higgs boson production cross section [9], such as derived from an extended Higgs sector [10], or by the presence of new scalars [11, 12].γ Z W W H H Z γ γ Z f f f H Figure 1: Diagrams contributing to Γ Zγ .This paper describes the first search for a Higgs boson in the H → Zγ final state at the LHC in the 120-160 GeV mass range, with the Z boson decaying into an electron or a muon pair. This is a clean final-state topology with an effective mass peak resolution of about 1-3%. To improve the sensitivity of the search, the selected dilepton-plus-photon events are subdivided into classes according to their mass resolution and the signal-to-background ratio, for both the electron and muon channels. The dominant backgrounds consist of the irreducible contribution from the SM Zγ production, and the reducible backgrounds from final-state-radiation in Drell-Yan or Z decays, an...

Using data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of e þ e − → pp at 12 center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective electromagnetic form factor of the proton is deduced under the assumption that the electric and magnetic form factors are equal ðjG E j ¼ jG M jÞ. In addition, the ratio of electric to magnetic form factors, jG E =G M j, and jG M j are extracted by fitting the polar angle distribution of the proton for the data samples with larger statistics, namely at ffiffi ffi s p ¼ 2232.4 and 2400.0 MeV and a combined sample at ffiffi ffi s p ¼ 3050.0, 3060.0 and 3080.0 MeV, respectively. The measured cross sections are in agreement with recent results from BABAR, improving the overall uncertainty by about 30%. The jG E =G M j ratios are close to unity and consistent with BABAR results in the same q 2 region, which indicates the data are consistent with the assumption that jG E j ¼ jG M j within uncertainties.

A search is presented for the direct pair production of a chargino and a neutralino , where the chargino decays to the lightest neutralino and the boson, , while the neutralino decays to the lightest neutralino and the 125 GeV Higgs boson, . The final states considered for the search have large missing transverse momentum, an isolated electron or muon, and one of the following: either two jets identified as originating from bottom quarks, or two photons, or a second electron or muon with the same electric charge. The analysis is based on 20.3  of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with the Standard Model expectations, and limits are set in the context of a simplified supersymmetric model.

We report STAR measurements of the longitudinal double-spin asymmetry A LL , the transverse singlespin asymmetry A N , and the transverse double-spin asymmetries A AE and A TT for inclusive jet production at mid-rapidity in polarized p þ p collisions at a center-of-mass energy of