There is a group working in and with the JetMET POG at the LPC. We have played a formative and leading role in delivering, calibrating, triggering, and improving jets and missing transverse energy at CMS since the inception of the LPC in 2005. In addition to supporting CMS, we provide expertise and education local at the LPC on Jets and MET to drive many physics analysis activities, from dijet resonances to supersymmetry.
There is a group at LPC working on QCD physics at CMS. Members of this group have extensive experience on QCD analyses from the Tevatron. The group has been involved in flagship QCD measurements, such as, the inclusive jet and dijet mass cross sections, dijet angular distributions and search for quark compositeness, jet substructure, and direct photon production.
There is a small group working in Bphysics/quarkonia. We have played a leading role in the first measurement of the Upsilon differential cross section at the LPC and a supporting role in the first measurement of the J/psi differential cross section.
We are searching for supernummary states and studying heavy ion collisions. We also use displaced Upsilons (and other states) as a probe for new physics.
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We work to monitor and improve the reconstruction of offline and online muon objects for the trigger and physics analysis. We have developed new fit strategies to optimize muon reconstruction from very low to very high momentum. We have also developed many tools useful for analysis with muons such as cosmic muon compatibility algorithms, electromagnetic shower characteristics algorithm, particle flow muon integration, tuned reconstruction of high-pT muons.
We are continuing to improve muon reconstruction. We work closely with many analysis groups to help understand muon selection, efficiencies, and related studies.
We have been working on b-tagging & vertexing at the LPC since 2006. We are leading the measurements of the b-tagging efficiencies for the several b-tag algorithms and operating points using the System8 method. We have also contributed to the commissioning, validation, and monitoring of the performance of the b-tag algorithms. We developed, commissioned, and monitored the luminous region or beam spot, and contributed to the performance of the primary vertex reconstruction. In addition, we educate beginners and provide support to physics analyses applying b-tagging.
There is a strong team at the LPC interested in searches for Supersymmetry. In particular, we are focused on the all hadronic search with jets and missing transverse energy (MET) in the final state, as well as searches with photons, jets, and MET. We have authored numerous CMS notes, physics analysis summaries, and journal publications based on 2010 data. We invite you to join us and share the excitement of our quest for discovery.
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The tracking group at the LPC has been involved in tracking at CMS for several years. Some of the earliest work was the first implementation of tracking in CMSSW. We also played an extensive role in the commissioning of reconstruction, in both the CRAFT runs and the first collision data. One ongoing project involving members of the LPC is the determination of the LHC beamline.
Some of the LPC residents with expertise in aspects of tracking are:
The LPC has members with strong expertise on top quark physics from the Tevatron and the LHC. We have been involved in the measurement of the top pair production cross section in the lepton+jets channel. We pioneered the analysis of boosted top jets originating from a heavy Z' resonance. We are involved in many analyses on searching for new physics using top quarks. For example, the search for a heavy W' boson decaying to top and bottom quarks, the search for a fourth generation t' quark, and the search of top pair resonances using boosted top jets.
LPC has a very broad spectrum of interest and is involved in multiple Higgs analyses. To name a few channels:
We are involved on all levels, from contributing to the detector level studies to high level analysis techniques. In the analyses we use everything available to us, from counting experiments to shape- and MVA-based approaches. We are doing analyses - from student level to paper editors, to review committees. And the greatest thing of all is - you are welcome to join!
The LPC hosts a team of strong experts in searches for exotic processes beyond the standard model. We explore not only all hadronic final states with jets, but also a combination of jets, photons, leptons, and missing transverse energy. We have developed a number of data driven methods of background estimation, which are used in many Exotica group analyses as well as other Physics Analysis Groups (PAGs). In addition, we play an important role in developing and mainaining the statistical tools for physics analyses. We never stop improving our search techniques, and we are always open to new ideas, so newcomers are very welcome in our group! Members of the Exotica PAG that are residents at the LPC have played a crucial role in analysis of data streaming from LHC, resulting in numerous internal documents and publications.
Key Exotica PAG members at the LPC:
Taus play an important role in a broad range of physics topics including EWK, Higgs, SUSY, and Exotica. Tau experts are part of the physics analyses groups where they share their knowledge on tau selection and background estimation techniques.
The LPC has made significant contributions to tau reconstruction and identification, and the development of tau triggers. The focus now is on further optimizations and reaching better understanding of the reconstruction efficiency and tau energy scale.
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