Elvira Rossi
(Universita e INFN, Napoli (IT))
28/04/2015, 08:30
WG3 Electroweak Physics and Beyond the Standard Model
Run 1 measurements on the production and decay properties of the Higgs boson will be presented.
Dermot Anthony Moran
(Universidad Autonoma de Madrid (ES))
28/04/2015, 09:05
WG3 Electroweak Physics and Beyond the Standard Model
A 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...
Marco Vanadia
(Universita e INFN, Roma I (IT))
28/04/2015, 09:25
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Marc Gabriel Weinberg
(Florida State University (US))
28/04/2015, 09:45
WG3 Electroweak Physics and Beyond the Standard Model
Several 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...
Dr
Edith Zinhle buthelezi
(iThemba LABS, Cape Town)
28/04/2015, 14:00
WG3 Electroweak Physics and Beyond the Standard Model
by 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...
Cosmin Dragoiu
(Texas Tech University (US))
28/04/2015, 14:20
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Gerhard Immanuel Brandt
(Georg-August-Universitaet Goettingen (DE))
28/04/2015, 14:35
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Ronan James Wallace
(University College Dublin (IE))
28/04/2015, 14:55
WG2 Small-x, Diffraction and Vector Mesons
The latest results on Z and W production measured by LHCb in the forward region are
presented.
Karen Chen
(Stony Brook University (US))
28/04/2015, 15:15
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Jordan Damgov
(Texas Tech University (US))
28/04/2015, 16:15
WG3 Electroweak Physics and Beyond the Standard Model
A 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...
Harikrishnan Ramani
(Yang Institute Of Theoretical Physics)
28/04/2015, 16:40
WG3 Electroweak Physics and Beyond the Standard Model
Run 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...
Jia Zhou
(SUNY at Buffalo)
28/04/2015, 17:00
WG3 Electroweak Physics and Beyond the Standard Model
Electroweak (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...
Richard Ruiz
(University of Pittsburgh)
28/04/2015, 17:20
WG3 Electroweak Physics and Beyond the Standard Model
Vector 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...
Dr
Elena Accomando
(University of Southampton)
28/04/2015, 17:40
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Juri Fiaschi
(University of Southampton)
28/04/2015, 18:00
WG3 Electroweak Physics and Beyond the Standard Model
Di-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...
Vincent Sulkosky
(MIT)
29/04/2015, 10:45
WG3 Electroweak Physics and Beyond the Standard Model
We 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} -...
Dave Gaskell
(Jefferson Lab)
29/04/2015, 11:10
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Dr
Yorito Yamaguchi
(Stony Brook University)
29/04/2015, 11:30
WG3 Electroweak Physics and Beyond the Standard Model
A "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...
Mr
Varun Vaidya
(Carnegie Mellon University)
29/04/2015, 11:50
WG3 Electroweak Physics and Beyond the Standard Model
We 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...
Matthew Low
(University of Chicago)
29/04/2015, 12:10
WG3 Electroweak Physics and Beyond the Standard Model
In 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...
Alexandre Beaulieu
(University of Victoria)
30/04/2015, 08:30
WG3 Electroweak Physics and Beyond the Standard Model
We 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...
Nathaniel Joseph Pastika
(Baylor University (US))
30/04/2015, 08:50
WG3 Electroweak Physics and Beyond the Standard Model
The 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...
Xiaowen Lei
(University of Arizona (US))
30/04/2015, 09:07
WG3 Electroweak Physics and Beyond the Standard Model
Given 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...
Francesco Romeo
(Chinese Academy of Sciences (CN))
30/04/2015, 09:27
WG3 Electroweak Physics and Beyond the Standard Model
Final 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)...
Dr
Daniel Hayden
(Michigan State University (US))
30/04/2015, 09:44
WG3 Electroweak Physics and Beyond the Standard Model
Many 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...
Paul Jonathan Turner
(University of Illinois at Chicago (US))
30/04/2015, 10:01
WG3 Electroweak Physics and Beyond the Standard Model
In 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...
Denis Rathjens
(Hamburg University (DE))
30/04/2015, 10:45
WG3 Electroweak Physics and Beyond the Standard Model
Supersymmetry 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...
Federico Meloni
(Universitaet Bern (CH))
30/04/2015, 11:13
WG3 Electroweak Physics and Beyond the Standard Model
Despite 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...
Florian Lyonnet
(LPSC)
30/04/2015, 11:44
WG3 Electroweak Physics and Beyond the Standard Model
QCD 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...
Nathaniel Craig
(UC Santa Barbara)
30/04/2015, 12:04
WG3 Electroweak Physics and Beyond the Standard Model
We 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.
