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Physics
Jet/MET
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.
- Elif Albayrak
- Leonard Apanasevich
- Anwar Bhatti
- Rick Cavanaugh
- Frank Chlebana
- Jordan Damgov
- Cosmin Dragoiu
- Daniel Elvira
- Selda Esen
- Robert Harris
- Ken Hatakeyama
- Shabnam Jabeen
- Chiyoung Jeong
- Jim Lungu
- Shuichi Kunori
- Sung-Won Lee
- Kalanand Mishra
- Seema Sharma
- Chris Silkworth
- Nikos Varelas
- Marek Zielinski
QCD
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.
- Leonard Apanasevich
- Anwar Bhatti
- Suvadeep Bose
- Richard Cavanaugh
- Vasundhara Chetluru
- Cosmin Dragoiu
- Vanessa Gaultney Werner
- Robert Harris
- David Mason
- Vivian O’Dell
- Nikos Varelas
- Marek Zielinski
BPhysics/Quarkonia
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.
- Jake Anderson
- Zhen Hu
- Nuno Leonardo
- Marco Mattia
- Ian Shipsey
- Yu Zheng
Muon
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.
- Adam Everett
- Hwidong Yoo
- Alexey Svyatkovskiy
- Norbert Neumeister
- Riccardo Bellan
- Giovanni Petrucciani
- Slava Krutelyov
Btag/Vertex
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.
- Saptaparna Bhattacharya
- Cecilia Gerber
- Samvel Khalatian
- Pratima Jindal
- Andrew Melo
- Meenakshi Narain
- Francisco Yumiceva
SUSY
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.
Tracking
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:
- Kevin Burkett
- Lenny Spiegel
- Nhan Tran
- Francisco Yumiceva
Top
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.
- Mark Adams
- Cecilia Gerber
- Dan Green
- Andrew Ivanov
- Pratima Jindal
- Sadia Khalil
- Samvel Khalatian
- Mikhail Makouski
- Lalith Perera
- Francisco Yumiceva
- Wei Zou
Higgs
LPC has a very broad spectrum of interest and is involved in multiple Higgs analyses. To name a few channels:
- "big" analyses (where we are already sensitive with 1.1 fb-1
delivered by LHC and recorded by CMS):
- H->2photons,
- H->ZZ (multiple modes including golden 4l mode),
- H->WW (in multiple channels including the most sensitive 2l2nu mode)
- other SM and MSSM analyses:
- associated Higgs production mechanism modes
- modes with H->bb decay channel
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!
Exotica
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:
- Leonard Apanasevich
- Suvadeep Bose
- John Paul Chou
- Alexey Ferapontov
- Eva Halkiadakis
- Robert Harris
- Christopher Hill
- Chiyoung Jeong
- Gena Kukartsev
- Greg Landsberg
- Duon Nguen
- Jason St John
- Ka Vang Tsang
- Nikos Varelas
- Kay Yi
Tau
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.