Conveners
Parallel 1A: Standard Model
- Session chair: Dr. Veronique Boisvert
Mr
Xingguo Li
(Manchester University)
08/04/2014, 13:00
The Energy Frontier Programme
contributed talk
The variable $\varphi^\star$ probes the same physical effects as the $Z/\gamma^\star$ boson transverse momentum, but is less susceptible to the effects of experimental resolution and efficiency. Using 10.4 fb$^{−1}$ of proton-antiproton collisions collected by the D0 detector at the Fermilab Tevatron, we measure the distribution of the variable $\varphi^\star$ in events containing dimuon pairs...
Samuel Webb
(University of Manchester (GB))
08/04/2014, 13:15
The Energy Frontier Programme
contributed talk
The $\phi_{\eta}^{\star}$ angle of Drell-Yan di-lepton pairs probes initial state gluon radiation and its definition relies only upon the well-measured lepton directions. The $\phi_{\eta}^{\star}$ distribution is sensitive to similar but complementary physics to the intermediate boson transverse momentum distribution. A measurement of the normalised $\phi_{\eta}^{\star}$ differential cross...
Christian Gutschow
(University College London (UK))
08/04/2014, 13:30
The Energy Frontier Programme
contributed talk
Events with jets produced in association with a $Z$ boson in proton-proton collisions can be used to study distributions sensitive to the vector boson fusion (VBF) process at CERN's Large Hadron Collider.
This process is interesting to study because of its similarity to the VBF production of a Higgs boson as well as its sensitivity to new physics via the WWZ triple gauge...
Peter Robert Davison
(University College London (UK))
08/04/2014, 13:45
The Energy Frontier Programme
contributed talk
This talk will present the first differential cross section measurements for the production of a Z boson produced in association with at least two b-jets. Data was collected using the ATLAS detector running at a centre of mass energy of 7 TeV during 2011. The analysis selects events with a leptonically decaying Z boson (to two electrons or two muons) produced in conjunction with two jets...
Craig Anthony Sawyer
(University of Oxford (GB))
08/04/2014, 14:00
The Energy Frontier Programme
contributed talk
One of the most challenges backgrounds to vector boson production in association with jets is that of QCD multijets. Current Monte Carlos struggle to model the background well and in adequate sample sizes. As a result data driven methods of estimation have been developed for use in precision analyses at the LHC. In this talk I will summarise the development of these methods in W+jet and R-jet...
Scott Stevenson
(University of Oxford (GB))
08/04/2014, 14:15
Flavour Physics and Beyond
contributed talk
Central exclusive production (CEP) is a mechanism by which a final state is produced in isolation at central rapidity in an elastic collision. CEP provides a uniquely clean environment in which to carry out meson spectroscopy, and to search for evidence of phenomena such as gluon saturation. We introduce CEP and discuss the suitability of the LHCb detector to its study. LHCb measurements of...
Hilal Kucuk
(University of London (GB))
08/04/2014, 14:30
Flavour Physics and Beyond
contributed talk
Jets are defined choosing the anti-kt algorithm with two radius parameters of 0.4 and 0.6. The inclusive double-differential cross section measurement at $\sqrt{s}=$8 TeV at 2012 is performed as a function of jet transverse momentum, in bins of jet rapidity. The data sample with no pile-up has been collected on low mu run for detector calibration and “clean” physics studies. Additionally, it...
Joshuha Thomas-Wilsker
(Royal Holloway, University of London (GB))
08/04/2014, 14:45
The Energy Frontier Programme
contributed talk
The ATLAS experiment has several algorithms which are used to identify b-jets. In this talk I concentrate on the so-called “MV1” b-tagging algorithm, which includes information on displaced secondary vertices and the impact parameters of tracks as inputs into a Neural Network. To calibrate this b-tagging algorithm we test how well it works on b-jets in simulation and then compare this with its...
Jeson Abe Jacob
(University of Bristol (GB))
08/04/2014, 15:00
The Energy Frontier Programme
contributed talk
Measurements of the top-quark pair differential cross-section with respect to global distributions including missing transverse energy, scalar sum of jet transverse momenta, scalar sum of total event scalar sum, leptonic W boson transverse momentum and leptonic W boson transverse mass have been carried out on 19.7fb-1 of data at 8TeV obtained from the CMS detector at the LHC. After...
Mr
Duncan Leggat
(University of Brunel)
08/04/2014, 15:15
The Energy Frontier Programme
contributed talk
The observation of the associated production of a single top quark and W boson using 12.2 fb$^{-1}$ of pp collisions at $\sqrt{s} = 8$ TeV with the CMS experiment is presented. A multivariate analysis based on kinematic variables was used to discriminate signal from the dominant ttbar background. The observed signal has a significance of 6.0$\sigma$ and a cross section of...
