Richard Wigmans
(Texas Tech University)
18/04/2011, 09:10
It is well known that non-compensating calorimeters, such as the ones used in the general purpose experiments at the Tevatron and the LHC, offer particular problems for correctly reconstructing the energy deposited by single hadrons and jets. In this talk,
I will review these problems, discuss the remedies usually employed, and offer possible alternatives.
Gregory Soyez
(CEA Saclay)
18/04/2011, 09:55
In the talk I will cover recent aspects of jet reconstruction at the LHC. As an introduction I will start by addressing the need for a robust set of jet definitions and the progress that has been achieved in that direction over the last years. Then I will discuss various techniques, built on that robust set of jet definitions, that have been developed to improve jet reconstruction. In...
Peter Loch
(University of Arizona)
18/04/2011, 11:10
The ATLAS experiment at the Large Hadron Collider (LHC) features a multi-purpose detector system with nearly complete coverage of the solid angle around the proton-proton or heavy ion collisions. It collected nearly 40/pb of proton data in 2010, and resumed data taking in early Spring 2011.
In this talk all aspects of jet physics, starting from jet reconstruction and calibration from the...
Roberto Tenchini
(University of Pisa)
18/04/2011, 11:55
The performance of the Compact Muon Solenoid detector during the operation of the Large Hadron Collider with pp and HI collisions in 2010 will be reviewed. Selected results with emphasis on physics with jets will be presented, with an outlook to the 2011 data taking.
Alberto Annovi
(Istituto Nazionale Fisica Nucleare (INFN) - Laboratori Nazionali di Frascati)
18/04/2011, 14:00
Hartmut Stadie
(Universität Hamburg)
18/04/2011, 14:30
We present a summary of jet reconstruction and measurements of jet performance at CMS from the 2010 run. Examples of jet commissioning, and measurements of jet energy corrections and jet resolution along with their systematic uncertainty are shown. We also present studies of tagging boosted top quarks and W bosons using specialized jet algorithms.
Doug Schouten
(Simon Fraser University (SFU))
18/04/2011, 14:55
Hadron jets are the most commonly observed objects in p-p collisions at the Large Hadron Collider at CERN. Because of this, they are part of the final state of almost any process, and are an important probe in searches for extensions of the Standard Model.
A precise knowledge of the energy calibration for jets is difficult to ascertain for a number of reasons, and is a necessary ingredient...
Gianluca Petrillo
(University of Rochester)
18/04/2011, 15:20
Francesc Vives Vaque
(Inst. de Fisica de Altas Energias (IFAE))
18/04/2011, 16:10
The inclusive jet cross section has been measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using the ATLAS detector at the LHC. The full 2010 dataset has been used, consisting of a total integrated luminosity of 37 pb-1 . The anti-kt algorithm is used to identify jets with two jet radius parameters, R = 0.4 and R = 0.6. Jet shapes measurements are performed to validate...
Zinonas Zinonos
((University and INFN, Pisa))
18/04/2011, 16:35
Inclusive multi-jet production is studied using the ATLAS detector for pp collisions with a center-of-mass of 7 TeV. The data sample corresponds to an integrated luminosity of 2.43 pb-1, using the first pp data collected by the ATLAS detector in 2010. Results on multi-jet cross sections and angular distributions are presented and compared to both LO plus parton-shower Monte Carlo predictions...
Konstantinos Kousouris
(Fermilab)
18/04/2011, 17:00
Various jet measurements based on the 2010 data collected by the CMS experiment at a center-of-mass energy of 7 TeV are presented. Results from inclusive jet cross-sections, dijet mass spectra, dijet angular distributions, hadronic event shapes and the ratio of the 3 jet to 2 jet production cross-sections will be illustrated.
Daniel Duggan
(Rutgers University)
18/04/2011, 17:30
We discuss the results of searches for various new physics phenomena with jets from the pp collisions at 7 TeV delivered by LHC and collected with the CMS detector in 2010. Final states with di-jets, multi-jets, jets+MET and jets+leptons are explored. In in many cases the searches set the most stringent limits on possible new physics phenomena.
Raffaele Tito D'Agnolo
(Scuola Normale Superiore and INFN, Pisa)
18/04/2011, 18:20
Andrea Neusiedl
(University of Mainz)
19/04/2011, 09:40
The top-quark mass is a fundamental parameter of the Standard Model. After the discovery of the top quark, the measurements of its properties were of substantial interest. Within the framework of the SM, the top-quark mass can be used in combination with other electroweak precision measurements to constrain the mass of the yet unobserved Higgs boson. In the new era of the Large Hadron...
Roberto Chierici
(CNRS/IPNL)
19/04/2011, 10:05
We present measurements of the top quark mass and of the ttbar invariant mass using the 2010 data collected by the CMS detector in pp collisions at a center-of-mass energy of 7TeV, amounting to a total integrated luminosity of 36 pb-1.
Massimo Nespolo
(University and INFN, Padova)
19/04/2011, 11:15
We present a study of jet production in association with W and Z bosons in proton-proton collisions at ECM=7 TeV using the full 2010 data set collected by CMS corresponding to an integrated luminosity of 36+-4 pb-1. The production of vector bosons with jets provides a stringent and important test of perturbative QCD calculations, and is an important background in searches for new physics and...
Marco Trovato
(INFN, Pisa)
19/04/2011, 12:05
Studying diboson associated production in a final state with a lepton, neutrino, and bb-pair is important since the event topology of this process is the same as expected for associated production of a W and a Standard Model light-Higgs boson. Thus, we consider the search for Diboson production as a preliminary step towards the Higgs discovery. Here we present a search for WW/WZ in events with...
Jonatan Piedra
(IFCA)
19/04/2011, 12:25
A review of CMS Higgs Boson searches with discovery and exclusion prospects for the coming LHC data is given. Measurements of related electroweak (di-)boson productions are also presented.
Riccardo Barbieri
(Scuola Normale Superiore, Pisa)
19/04/2011, 14:30
I make some remarks about using jets to search for new physics at hadron colliders.
Paolo Francavilla
(University and INFN, Pisa)
19/04/2011, 15:15
In the last couple of years important progresses in the simulation of the QCD high pT processes have been carried out. In this talk, a review of the tools and techniques historically used to simulate QCD cross sections will be presented from a user point of view. The benchmark process selected for the discussion is the inclusive jet cross section. The talk will focus on the uncertainties of...
Paolo Lodone
(Scuola Normale Superiore, Pisa)
19/04/2011, 15:45
We will discuss the new dominant bounds that can be derived on the coefficient of the effective operator generated by tree-level graviton exchange in large extra dimensions from pp -> jj data at LHC: M_T > 2.1TeV (ATLAS after 3.1/pb of integrated luminosity), M_T > 3.4 TeV (CMS after 36/pb). We clarify the role of on-shell graviton exchange and compare the full graviton amplitude to data,...
