Conveners
Track 1
- Wahid Bhimji (University of Edinburgh (GB))
Track 1
- Jeff Hartnell (University of Sussex)
Track 1
- Richard White (University of Leicester)
Luke Lambourne
(University College London (UK))
4/9/13, 8:45 AM
Parallel Track 1
The observation of a Z boson decaying to b quarks at a hadron collider is a difficult measurement to make due to the large QCD background. This talk will show work to develop methods to increase this low signal to background ratio, as part of the ongoing effort to measure the Z to bb signal with the ATLAS detector.
Gregory James Fletcher
(University of London (GB))
4/9/13, 8:57 AM
Parallel Track 1
The current status of the R+Jets ratio measurement of W to Z production cross sections in association with jets with the ATLAS detector, using 7TeV pp collisions of the 2011 ATLAS dataset. Cross section ratios for the vector bosons decaying to electron and muons are measured for jets with transverse momentum PT > 30GeV and jet rapidity |y| < 4.4 and compared to predictions from different...
Kiran Daniel Joshi
(University of Manchester (GB))
4/9/13, 9:09 AM
Parallel Track 1
The ATLAS measurement of ttbar production with a veto on additional central jet activity is presented, the results of which were used to constrain the size of QCD modelling uncertainties in ttbar events.
Ongoing work on alternative prescriptions for estimating such uncertainties will also be discussed.
Andrew Gilbert
(Imperial College Sci., Tech. & Med. (GB))
4/9/13, 9:21 AM
Parallel Track 1
This talk covers the search for the standard-model Higgs boson decaying to tau leptons using the CMS detector at the LHC. The most recent results are presented, using 4.9 fb^-1 of data taken at 7 TeV during 2011 and 19.4 fb^-1 at 8 TeV in 2012. The search utilises five final states, coming from the different decay modes of the tau, and a 95% CL upper limit is calculated by analysing the...
Edward Thomas Greening
(University of Oxford)
4/9/13, 9:33 AM
Parallel Track 1
This talk introduces recent D meson decay results published by the LHCb experiment.
Such decays are unique in that unlike B and K decays, they provide information about the coupling of up-type quarks. These have the potential to be affected differently to down-type quarks by new physics.
Matthew Michael Reid
(University of Warwick)
4/9/13, 9:45 AM
Parallel Track 1
The LHCb dataset provides the potential to significantly improve the knowledge of $B^0_{(s)} \to J/\psi K_S^0 h^+ h^{(\prime)-}$ decays. Exotic charmonia states have been observed (or claimed), produced in B decays together with a kaon, and decaying to $J/\psi h^+ h^{(\prime)-}$: the $X(3872)$ decaying to $J/\psi \pi^{+} \pi^{-}$, and the $X(4140)$ decaying to $J/\psi \phi$. These could be...
William James Barter
(University of Cambridge (GB))
4/9/13, 1:30 PM
Parallel Track 1
Measurements of Electroweak Gauge Boson Production at LHCb probe a previously poorly explored low x region of phase space. Such measurements provide unique constraints on PDFs, as well as providing tests of the Standard Model in regions where theoretical predictions have not been tuned. Results from LHCb are complementary to those made at the ATLAS and CMS experiments. This talk will cover...
Jack Benton
(University of Bristol (GB))
4/9/13, 1:42 PM
Parallel Track 1
Here we present a systematic amplitude analysis of the decay from D0 and D0-bar mesons to four charged pions, using the full dataset from Cleo-C. A genetic algorithm was used to refine the amplitude model while fitting to five dimensional Dalitz plots. While the model is of interest in its own right, the analysis also allows for the measurement of phase differences, such as from the CP...
Thomas Michael Bird
(University of Manchester (GB))
4/9/13, 1:54 PM
Parallel Track 1
The mass differences ∆ms and ∆md are extracted from the full 2011 LHCb dataset, using the decays B(s)→D(s) μ ν, where D(s)→K K π. Measured B momentum is reduced due to missing particles. This is corrected for using a simulation-based statistical correction, known as the k-factor. A novel resolution model, also taken from the simulation, is used to fit the proper time distributions and...
Joel Alexander Klinger
(University of Manchester (GB))
4/9/13, 2:06 PM
Parallel Track 1
A search for a heavy Majorana neutrino decaying into a W boson and a muon has been performed using the ATLAS detector at the LHC. The search is performed using events with two same-sign muons, at least two jets and low missing transverse momentum. The data used in the search were collected in pp collisions at √s = 7 TeV in 2011 and correspond to an integrated luminosity of 4.7 fb−1. No excess...
Andrew Fowlie
(U)
4/9/13, 2:18 PM
Parallel Track 1
In light of the failed supersymmetry searches at the LHC, with Bayesian statistics, I discuss: Where is supersymmetry?, and, Is the most constrained supersymmetry model still viable? I briefly review recent experimental results – from collider and astroparticle physics - that constrain supersymmetry, and explain how we included such results in a Bayesian analysis of the Constrained Minimal...
James Sinclair
(U)
4/9/13, 2:30 PM
Parallel Track 1
Situated 2 km underground in Sudbury, Northern Ontario, the SNO+ detector consists of an acrylic sphere 12 m in diameter containing 780 tons of target mass, surrounded by approximately 9,500 PMTs. For SNO, this target mass was heavy water, however the change to SNO+ is defined by the change of this target mass to a novel scintillator. With the lower energy threshold, low intrinsic...
Helen O'Keeffe
(University of Oxford)
4/9/13, 2:42 PM
Parallel Track 1
Single pi0 production is one of the most significant backgrounds in the T2K nu-e appearance measurement and due to uncertainties in the production cross-section, it is one of the most difficult to constrain. Measurements of neutral current single pion production in the near detector can be extrapolated to the far detector and used to constrain this background. An analysis that uses a specific...
Terry Duboyski
(Queen Mary University London)
4/9/13, 2:54 PM
Parallel Track 1
To expand upon the T2K ND280 NuMu Tracker analysis we begin to explore currently unaddressed phase-space for use in a CCQE cross-section measurement.
Peter Millington
(University of Sheffield)
4/9/13, 3:06 PM
Parallel Track 1
In arXiv:1211.3152, we present a new perturbative formulation of non-equilibrium thermal field theory, based upon non-homogeneous free propagators and time-dependent vertices. The resulting time-dependent diagrammatic perturbation series are free of pinch singularities without the need for quasi-particle approximation or effective resummation of finite widths. Introducing a physically...
Mr
Jonathan Harris
(Durham University)
4/10/13, 8:45 AM
Parallel Track 1
At TeV photon energies the universe has a high optical depth due to the
presence of extragalactic background light (EBL) photons from stars and star-formation which provide a target for pair production. Measuring the amount of absorption in the gamma-ray spectrum from a relatively distant object such as an active galactic nucleus (AGN) reveals information about the level of the EBL, which in...
Indrek Sepp
(Imperial College Sci., Tech. & Med. (GB))
4/10/13, 8:57 AM
Parallel Track 1
The RICH is a subdetector of the LHCb experiment, it is used to distinguish between Pions,Kaons and Protons in a momentum range of 1-100 GeV. The RICH detects Cherenkov radiation which is emitted by particles as they pass through gas and aerogel mediums. The performance of the detector is dependent on the photon yield - the number of Cherenkov photons that are detected by the RICH. This...
Edward Overton
(The University of Sheffield)
4/10/13, 9:09 AM
Parallel Track 1
The International Muon Ionisation Cooling Experiment (MICE) is a proof of principle demonstration of ionisation cooling for application in a future neutrino factory or muon collider. The experiment will measure the beam emittance before and after cooling to a high precision using individual particle measurements.
MICE is under construction at the Rutherford Appleton Laboratory (UK), where a...
Samer Al-Kilani
(University of London (GB))
4/10/13, 9:21 AM
Parallel Track 1
The LHC is currently on its first upgrade phase (PHASE-0) and anticipating 2 further upgrades with the last phase (PHASE-II) foreseen for 2022-2023. PHASE-II will aim to increase the integrated luminosity of the LHC to ten times fold the original LHC design luminosity. The so called HL-LHC will introduce harsher conditions in terms of particle count and radiation dosage. An international R&D...
Roxanne Guenette
(Yale University)
4/10/13, 9:33 AM
Parallel Track 1
Liquid Argon (LAr) detectors are an excellent choice for neutrino detection and direct dark matter searches mainly due to their scalability. The next generation of experiments aims to construct very large scale detectors, however a lot of R&D is still required to demonstrate the technology. For example, both neutrino and dark matter experiments utilise the scintillation light produced in the...
