New Structure Function Results at Low x and High Q^2 from HERA

A precise proton structure function F_2 at low x is measured. The data is interpreted in the framework of QCD with an extraction of gluon density xg. The charm contribution to F_2 is determined in an extended kinematic range. Neutral and charged current cross-sections at high Q^2 are also measured and compared with the Standard Model predictions.Comment: 8 pages, 6 figure

Review of Recent Calculations of the Hadronic Vacuum Polarisation Contribution

Recent calculations of the hadronic vacuum polarisation contribution are reviewed. The focus is put on the leading-order contribution to the muon magnetic anomaly involving $e^+e^-$ annihilation cross section data as input to a dispersion relation approach. Alternative calculation including tau data is also discussed. The $\tau$ data are corrected for various isospin-breaking sources which are explicitly shown source by source.Comment: 8 pages, 9 figures, 3 tables, invited talk given at the FCCP 2015 worksho

HERA Inclusive Neutral and Charged Current Cross Sections and a New PDF Fit, HERAPDF 2.0

In this talk, I present the brand new results from the H1 and ZEUS Collaborations on the combination of all previously published inclusive deep inelastic cross sections at HERA for neutral and charged current $e^\pm p$ scattering for zero beam polarisation and the corresponding parton distributions functions, HERAPDF 2.0, at up to next-to-next-to-leading order (NNLO). The results also include a new precise determination at next-to-leading order (NLO) of the strong coupling constant $\alpha_s(M^2_Z)=0.1184\pm 0.0016$ (excluding scale uncertainties) based on a simultaneous fit to the combined inclusive cross section data and jet production data.Comment: 6 pages, 2 figures, talk given at the EDS Blois 2015 Conference for the H1 and ZEUS Collaboration

New Analysis of SUSY Dark Matter Scenarios at ILC

Applying realistic veto efficiencies for the low angle electromagnetic calorimeter located in the very forward direction of the future international linear collider, we revisited the Standard Model background contributions studied previously in stau analyses with supersymmetrical dark matter scenarios

Study of Rare Exclusive Electroweak Processes at HERA

Results on multi-lepton events at high transverse momenta, isolated lepton events with large missing transverse energy and single W production reported to this conference are based for the first time on the full data samples taken by two colliding experiments, H1 and ZEUS, at HERA. The data correspond to an integrated luminosity of about 1fb-1 from both experiments.Comment: Parallel talk at ICHEP08, Philadelphia, USA, July 2008. 4 pages, LaTeX, 4 ps figure

Top and EW Physics at the LHeC

The LHeC is a proposed upgrade of the LHC to study $ep/eA$ collisions in the TeV regime, by adding a 60 GeV electron beam through an energy recovery linac. In $ep$, high precision top and electroweak physics can be performed, such as measurements of anomalous top couplings, light quark couplings to the $Z$ boson and the energy dependence of the weak mixing angle $\sin^2\!\theta_W$, for which simulation studies are presented.Comment: 6 pages, 3 figures, 1 table, talk given at the EPS-HEP 2015 conference for the LHeC Study Grou

Electron polarization measurement using a Fabry-Perot cavity at HERA

A new Compton longitudinal polarimeter currently under construction for HERA is presented. The key component of the polarimeter is a Fabry-Perot cavity located around the electron beam pipe. With such an optical cavity, a continuous laser power equivalent to 5 kW, much higher than those commercially available, can be achieved, leading to one backscattered photon per bunch crossing. This ``few-photon mode'' will allow a very precise determination of the calorimeter response with little systematic uncertainty. The electron polarization measurement at the per mill level is expected.Comment: Talk given at the International Europhysics Conference on High Energy Physics, Budapest (Hungary), July 12-18, 2001. On behalf of E. Barrelet, V. Brisson, M. Jacquet-Lemire, A. Reboux, C. Pascaud, F. Zomer and the HERA POL2000 grou

Experimental implications for a linear collider of SUSY dark matter scenario

This talk presents the detection issues for the lightest slepton \tilde{\tau}_1 at a future e+e- TeV collider given the dark matter constraints set on the SUSY mass spectrum by the WMAP results. Two methods for measuring its mass m_{\tilde{\tau}_1} and the resulting precision on the dark matter density are briefly discussed in the SUSY mSUGRA scenario with R-parity conservation when the mass difference between m_{\tilde{\tau}_1} and that of the lightest neutralino is small (a few GeV). The analysis is performed with TESLA parameters in both head-on and crossing angle modes.Comment: Talk given at the International Conference on Linear Colliders - Paris, France, April 19-23, 200

Review of recent leading-order hadronic vacuum polarization calculation

The leading-order hadronic contribution to the muon magnetic moment anomaly $a_\mu\equiv (g_\mu-2)/2$, calculated using a dispersion integral of $e^+e^-$ annihilation data and $\tau$ data, is briefly reviewed. This contribution has the largest uncertainty to the predicted value of $a_\mu$, which differs from the direct measurement by $\sim 3.6 (2.4)$ standard deviations for the $e^+e^- (\tau)$ based analysis. Recent results and main open issues on the subject are discussed.Comment: 10 pages, 6 figures, Proceedings of Photon 2013. arXiv admin note: text overlap with arXiv:1302.189

Searches for Leptoquarks, Squarks in ̸Rp\not R_p SUSY and Excited Fermions at HERA

Various searches for leptoquarks, scalar quarks in $R_p$-violating supersymmetric models, and excited fermions performed by the HERA experiments H1 and ZEUS are reviewed. No evidence for new particle production was observed from data collected by both experiments since 1994 in either electron-proton and positron-proton collisions. Stringent limits derived on the masses and couplings of these new particles are compared whenever appropriate with those from LEP, the Tevatron and low energy experiments.Comment: 5 pages, 2 figure