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Elvira Rossi (Universita e INFN, Napoli (IT))28/04/2015, 08:30WG3 Electroweak Physics and Beyond the Standard ModelRun 1 measurements on the production and decay properties of the Higgs boson will be presented.Go to contribution page
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Dermot Anthony Moran (Universidad Autonoma de Madrid (ES))28/04/2015, 09:05WG3 Electroweak Physics and Beyond the Standard ModelA search for additional Higgs-like bosons in the H to WW and H to ZZ decay channels is reported, for Higgs boson masses in the range 145 < m_H < 1000 GeV. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb-1 at sqrt(s) = 7 TeV and up to 19.3 fb-1 at sqrt(s) = 8 TeV, recorded by the CMS experiment at the LHC. Several final...Go to contribution page
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Marco Vanadia (Universita e INFN, Roma I (IT))28/04/2015, 09:25WG3 Electroweak Physics and Beyond the Standard ModelThe discovery of a Higgs boson with a mass of about 125 GeV has prompted the question of whether or not this particle is part of a larger and more complex Higgs sector than that envisioned in the Standard Model. In this talk, the latest Run 1 results from the ATLAS Experiment on Beyond-the-Standard Model (BSM) Higgs searches are outlined. Searches for additional Higgs bosons are...Go to contribution page
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Marc Gabriel Weinberg (Florida State University (US))28/04/2015, 09:45WG3 Electroweak Physics and Beyond the Standard ModelSeveral models of new physics predict the existence of new light bosons that are weakly coupled to SM particles. Two examples include SUSY with a "dark" sector (in which the new light bosons can also be relatively long-lived) or models with an extended Higgs sector, e.g. NMSSM. In these scenarios, the new bosons can be produced either in the Higgs decays or as part of SUSY cascades. In the...Go to contribution page
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Dr Edith Zinhle buthelezi (iThemba LABS, Cape Town)28/04/2015, 14:00WG3 Electroweak Physics and Beyond the Standard Modelby E.Z. Buthelezi for the ALICE collaboration, Department of Nuclear Physics, iThemba LABS, Cape Town, South Africa. W bosons are produced in hard scattering processes of partons in collisions of hadrons and they do not interact strongly with the medium produced in high-energy heavy-ion collisions. Therefore, in p-Pb collisions the measurement of W-boson yields represents a standard...Go to contribution page
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Cosmin Dragoiu (Texas Tech University (US))28/04/2015, 14:20WG3 Electroweak Physics and Beyond the Standard ModelThe production of W and Z bosons has been observed in pp collisions at a center-of-mass energy of 7 and 8 TeV using data collected in the CMS experiment. W events were selected containing an isolated, energetic electron or muon. Z events were selected containing a pair of isolated, energetic electrons or muons. Data-driven methods are used to estimate reconstruction and triggering...Go to contribution page
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Gerhard Immanuel Brandt (Georg-August-Universitaet Goettingen (DE))28/04/2015, 14:35WG3 Electroweak Physics and Beyond the Standard ModelThe ATLAS Collaboration is engaged in precision measurement of fundamental Standard Model parameters, e.g. the weak-mixing angle and the complete set of coefficients that describe the angular distributions of Drell-Yan production. A measurement of the forward-backward asymmetry for the neutral current Drell Yan process is presented and the results are then used to extract a measurement...Go to contribution page
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Ronan James Wallace (University College Dublin (IE))28/04/2015, 14:55WG2 Small-x, Diffraction and Vector MesonsThe latest results on Z and W production measured by LHCb in the forward region are presented.Go to contribution page
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Karen Chen (Stony Brook University (US))28/04/2015, 15:15WG3 Electroweak Physics and Beyond the Standard ModelThe ATLAS collaboration has carried a set of measurements that provide stringent tests of the electroweak sector of Standard Model, specifically on di- and multi-boson production cross sections and on triple and quartic gauge-boson couplings. Such measurements include cross sections for WV (V=W or Z) production in the leptonic or semileptonic channels, the production of a W or Z boson in...Go to contribution page
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Jordan Damgov (Texas Tech University (US))28/04/2015, 16:15WG3 Electroweak Physics and Beyond the Standard ModelA search for exclusive or quasi-exclusive W+ W- production induced by photon-photon exchange in pp collisions at sqrt(s)=8 TeV is reported using data corresponding to an integrated luminosity of 19.7 fb-1. Events are selected by requiring the presence of an electron-muon pair with large transverse momentum pT > 30 GeV and no associated charged particles detected from the same vertex. The...Go to contribution page
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Harikrishnan Ramani (Yang Institute Of Theoretical Physics)28/04/2015, 16:40WG3 Electroweak Physics and Beyond the Standard ModelRun 1 of the LHC has reported routine excesses in WW measurements both at 7 and 8 TeV. I shall demonstrate that accounting for higher order QCD effects through pT resummation can account for some of the differences between theory and experiment. A closely related approach; jet veto resummation has also had success explaining this excess. I will also talk about where these methods agree and...Go to contribution page
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Jia Zhou (SUNY at Buffalo)28/04/2015, 17:00WG3 Electroweak Physics and Beyond the Standard ModelElectroweak (EW) corrections at the LHC can be enhanced at high energies due to soft/collinear radiation of W and Z bosons, being dominated by Sudakov-like corrections in the form of $\alpha_W^l\log^n(Q^2/M_W^2)\;(n\le 2l-1, \alpha_W = \frac{\alpha}{4\pi\sin\theta_W^2})$ when the energy scale $Q$ enters the TeV regime. Thus, the inclusion of EW corrections in LHC predictions is...Go to contribution page
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Richard Ruiz (University of Pittsburgh)28/04/2015, 17:20WG3 Electroweak Physics and Beyond the Standard ModelVector boson fusion processes become increasingly more important at higher collider energies and for probing larger mass scales due to collinear logarithmic enhancements of cross sections. We consider the specific case of WA fusion at hadron colliders, and systematically categorize the contributions from an initial state photon in the elastic, inelastic, and deeply inelastic channels. Scale...Go to contribution page
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Dr Elena Accomando (University of Southampton)28/04/2015, 17:40WG3 Electroweak Physics and Beyond the Standard ModelThe Forward-Backward Asymmetry (AFB) in Z' physics is commonly only perceived as the observable which possibly allows one to interpret a Z' signal by distinguishing different models of such (heavy) spin-1 bosons. In this talk, we examine the potential of AFB in setting bounds on or even discovering a Z' boson at the Large Hadron Collider (LHC) and show that it might be a powerful tool for this...Go to contribution page
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Juri Fiaschi (University of Southampton)28/04/2015, 18:00WG3 Electroweak Physics and Beyond the Standard ModelDi-lepton production at hadron colliders is by far the preferred channel to search for Z โฒ bosons. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the presence of both (Z โฒ ) finite width and interference (with the Standard Model) effects. Furthermore, the primary observable used has traditionally been the cross...Go to contribution page
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Vincent Sulkosky (MIT)29/04/2015, 10:45WG3 Electroweak Physics and Beyond the Standard ModelWe report on a measurement of parity-violating (PV) asymmetries in the deep inelastic scattering (DIS) and nucleon resonance regions using inclusive scattering of longitudinally polarized electrons from unpolarized deuterons. The effective weak couplings $C_{2q}$ are accessible through these PV-DIS asymmetries. This measurement of the PV asymmetry yielded a determination of $2C_{2u} -...Go to contribution page
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Dave Gaskell (Jefferson Lab)29/04/2015, 11:10WG3 Electroweak Physics and Beyond the Standard ModelThe weak charge of the proton, $Q^p_{W}$, has been measured precisely for the first time at Jefferson Lab. The running of the weak mixing angle ($\sin^2\theta_W/2$), and thus $Q^p_{W}$, from the $Z$-pole to the low momentum transfers of this measurement is potentially sensitive through radiative corrections to new physics beyond the Standard Model. The Q-Weak experiment ran in Hall...Go to contribution page
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Dr Yorito Yamaguchi (Stony Brook University)29/04/2015, 11:30WG3 Electroweak Physics and Beyond the Standard ModelA "dark photon" has been proposed as a hypothetical U(1) gauge boson in the dark sector. The dark photon is weakly coupled with ordinary photons and can explain several experimental results which can not be described by the standard model such as the excess of high energy positrons in cosmic rays and the muon g-2 anomaly. The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has...Go to contribution page
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Mr Varun Vaidya (Carnegie Mellon University)29/04/2015, 11:50WG3 Electroweak Physics and Beyond the Standard ModelWe systematically compute the annihilation rate for neutral winos into the final state $\gamma + X$, including all leading radiative corrections. This includes both the Sommerfeld enhancement (in the decoupling limit for the Higgsino) and the resummation of the leading electroweak double logarithms. Adopting an analysis of the HESS experiment, we place constraints on the mass as a...Go to contribution page
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Matthew Low (University of Chicago)29/04/2015, 12:10WG3 Electroweak Physics and Beyond the Standard ModelIn weak-scale theories of beyond the Standard Model physics, particle dark matter is ubiquitous. This is for good reason as observations point towards TeV-scale dark matter with weak-strength interactions. One promising way to search of this type of dark matter is via production at hadron colliders. In this talk I will discuss strategies for searching for dark matter at colliders and...Go to contribution page
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Alexandre Beaulieu (University of Victoria)30/04/2015, 08:30WG3 Electroweak Physics and Beyond the Standard ModelWe report on the latest searches for low mass states predicted in several New Physics models performed with the data collected by the BABAR detector. These include: searches for the so-called dark photons in e+e- annihilations (e+e- -> gamma Aโ, Aโ -> e+e-, mu+mu-), and for long-lived particles motivated by recent astrophysical observations; searches for non-standard pi0-like particle...Go to contribution page
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Nathaniel Joseph Pastika (Baylor University (US))30/04/2015, 08:50WG3 Electroweak Physics and Beyond the Standard ModelThe origin of neutrino mass has been a longstanding question in high energy particle physics. One possible solution arises through the seesaw mechanism if neutrinos have a Majorana mass term. The most conclusive proof of Majorana neutrinos may be their detection from direct production of heavy right-handed neutrinos at the LHC. Limits on the existence of heavy right-handed neutrinos are placed...Go to contribution page
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Xiaowen Lei (University of Arizona (US))30/04/2015, 09:07WG3 Electroweak Physics and Beyond the Standard ModelGiven that the Standard Model is very successful in describing the nature and no clue is found on the scale of new physics, signature-based search covering a wide range of final states and topologies has been more important nowadays. Searches for fermionic top/bottom quark partners, referred to as vector-like quarks, have been performed in various final states with leptons, jets and...Go to contribution page
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Francesco Romeo (Chinese Academy of Sciences (CN))30/04/2015, 09:27WG3 Electroweak Physics and Beyond the Standard ModelFinal states with a pair of particles are sensitive to many models beyond the Standard Model (SM) and allow for a clean search for both new narrow resonances and broad deviations from SM predictions. The most recent results from searches with dijet, dileptons, and leptons plus missing transverse energy are presented using 20 fb-1 of pp collision data collected by the CMS detector with sqrt(s)...Go to contribution page
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Dr Daniel Hayden (Michigan State University (US))30/04/2015, 09:44WG3 Electroweak Physics and Beyond the Standard ModelMany new physics scenarios beyond the Standard Model predict the presence of narrow or broad resonances decaying to a pair of fermions (light and heavy quarks, charged leptons and neutrinos) or bosons (gammagamma, WW, WZ, ZZ and HH). The high-mass resonant production of top-quark or vector boson pairs is also a good benchmark process for boosted top and massive boson tagging. This...Go to contribution page
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Paul Jonathan Turner (University of Illinois at Chicago (US))30/04/2015, 10:01WG3 Electroweak Physics and Beyond the Standard ModelIn many models of physics beyond the Standard Model the coupling of new physics to third generation quarks is enhanced. A search is presented for resonant top quark pair production. The full dataset recorded with the CMS detector in proton-proton collisions at a centre-of-mass energy of 8 TeV is used. The search is performed by measuring the invariant mass distribution of the top-quark pair...Go to contribution page
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Denis Rathjens (Hamburg University (DE))30/04/2015, 10:45WG3 Electroweak Physics and Beyond the Standard ModelSupersymmetry is one of the most thoroughly discussed extensions of the Standard Model, and is providing elegant solutions to fundamental questions like the nature of Dark Matter or the hierarchy problem. In this talk, recent results from the CMS experiment at the LHC on searches for supersymmetry are presented using 20/fb of data from the 8 TeV LHC run. A variety of complementary final state...Go to contribution page
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Federico Meloni (Universitaet Bern (CH))30/04/2015, 11:13WG3 Electroweak Physics and Beyond the Standard ModelDespite the absence of experimental evidence, weak scale supersymmetry remains one of the best motivated and studied Standard Model extensions. This talk summarises recent ATLAS results for searches for supersymmetric (SUSY) particles. Weak and strong production in both R-Parity conserving and R-Parity violating SUSY scenarios are considered. The searches involved final states...Go to contribution page
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Florian Lyonnet (LPSC)30/04/2015, 11:44WG3 Electroweak Physics and Beyond the Standard ModelQCD resummation predictions for the production of Wโฒ and Zโฒ heavy gauge bosons decaying leptonically will be presented. The results of our resummation code at next-to-leading order and next-to-leading logarithmic accuracy will be compared to Monte Carlo predictions obtained with PYTHIA at leading order supplemented with parton showers and FEWZ at NLO and next-to-next-to-leading order for the...Go to contribution page
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Nathaniel Craig (UC Santa Barbara)30/04/2015, 12:04WG3 Electroweak Physics and Beyond the Standard ModelWe provide an overview of the state of beyond-the-Standard Model phenomenology at the beginning of Run 2, with a particular focus on phenomena associated with naturalness of the weak scale. We also briefly survey the prospects for probing naturalness at future high-energy colliders.Go to contribution page
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