This page was thrown together quickly to provide some info about what we are doing these days. As an aside, the page with info on the UCSD written exam is here.

At this point, we are recruiting:

• undergraduates
• graduate students

CMS

This is where the focus is going now. Between 2004-2007, our focus was primarily on CMS computing, while doing physics only on CDF, where there was data. As we got closer to LHC data taking this has changed.

Professors Yagil and Wuerthwein work closely with Claudio Campagnari's group at UCSB, and Lothar Bauerdick's group at FNAL. At UCSD, our physics effort includes 5 graduate students, 5 post-docs, and two faculty as of February 2012.

CMS physics publications from our group on the 2011 data

The total integrated luminosity in 2011 was 4.7/fb as compared to 0.036/fb in 2010. The 2011 data taking period thus saw more than a x100 increase in luminosity. As of February 2012, the analyses are coming out of the approval process one after the other. We expect them to become public by mid march. I'll add in the links to the preprints as they become public.

• Higgs Searches
  • Higgs to WW to lnu lnu (Accepted for publication in Physics Letters B)
  • Higgs to ZZ to ll nunu
• WW cross section and anomalous triple gauge couplings
• Searches for new physics:
  • tprime (search for a high mass sibling of the top quark)
  • Supersymmetry in the Z + MET + jets final state
  • Supersymmetry in the opposite sign dilepton final state
  • Supersymmetry in the same sign dilepton plus 2 btags final state (search for stop, sbottom from gluino decay, and sbottom pair production, same sign top)
    • This also includes same sign top search update of the 2010 analysis, i.e. the one motivated by the top Afb anomaly in CDF.
  • Supersymmetry in the same sign dilepton final state
  • Supersymmetry in the WZ + MET and ZZ + MET final state

In addition to these analyses with the 2011 data, we are also preparing for the 2012 data taking period.

• We are adding a measurement of the top Afb at CMS in the dilepton final state. The goal is to either confirm or rule out the CDF top Afb anomaly. This is harder at CMS than at CDF because the initial state is proton proton. The only way an Afb can be measured is by looking into the high eta region where there is a significant q qbar production rate with qbar from sea quarks. The direction is given by the valence quark direction.
• We are adding an attempt to search for stop pair production via making a precision measurement of top pair kinematics. The most sought after corner of phase space where low energy supersymmetry might be hiding is stop pair production for stop masses close to the top mass.
• We will continue many but probably not all of our 2011 analyses also on the 2012 data. Details depend somewhat on student and post-doc interests.

CMS physics publications from our group on the 2010 data

During the first year (2010) of data taking with the LHC, our focus is on physics with dileptons. This lead to the following publications:

• First measurement of top pair production at the LHC: http://arxiv.org/abs/1010.5994
• Measurement of the WW cross section: http://arxiv.org/abs/1102.5429
• Search for new physics with opposite sign dileptons plus jets and met: http://arxiv.org/abs/1103.1348
• Search for new physics with same-sign dileptons plus jets and met: http://arxiv.org/abs/1104.3168
• Measurement of top pair cross section with the full 2010 dataset: http://arxiv.org/abs/1105.5661
• Search for same-sign top pair production: http://arxiv.org/abs/1106.2142

CMS Software & Computing

• Bruce Thayre (Software & Computing Staff)
• Warren Andrews (graduate)
• Ian McNeil? (graduate)
• James Letts (Researcher)
• Terrence Martin (Software & Computing Staff)
• Sanjay Padhi (Researcher)
• Haifeng Pi (Researcher)
• Jeff Dost (Software & Computing Staff)
• Igor Sfiligoi (Software & Computing Staff)
• Alya Tadel (Software & Computing Staff)
• Matevz Tadel (Researcher)
• Frank Wuerthwein (faculty)
• Avi Yagil (faculty)

• This twiki is hosted by the Tier-2 at UCSD.
• Global Computing Commissioning
• Debugging Data Transfers Task Force
  • Direct link to DDT

Publications on Computing by people in our group

• CHEP 2009, Journal of Physics: Conference Series 219
  • Use of glide-ins in CMS for production and analysis (also CMS CR-2009/081)
  • A Grid Job Monitoring System
  • CREAM-CE: First experiences, results and requirements of the 4 LHC experiments
  • The commissioning of CMS sites: improving site reliability
  • Bringing the CMS Distributed Computing System into Scalable Operations
  • Pseudo-interactive monitoring in distributed computing
  • Flexible Session Management in a Distributed System
  • Scalability and interoperability within glideinWMS
  • SVOPME: A Scalable Virtual Organization Privileges Management Environment
  • CDF software distribution on Grid using Parrot
  • CDF GlideinWMS? usage in Grid computing in High Energy Physics
• CHEP2010, Journal of Physics: Conference Series
  • The conference proceedings can be found online here
  • An Update on the scalability limits of the Condor batch system
  • Early Experiences on using glideinWMS in the Cloud
  • Scalability of Network Facing Services used in the Open Science Grid
  • CMS Distributed Computing Integration in the LHC sustained operations era
  • Large Scale commissioning and operational experience with tier-2 to tier-2 data transfer links in CMS
  • Operating a production pilot factory serving several scientific domains
  • Event Display for the Visualization of CMS Events
  • Measuring and understanding computer resource utilization in CMS
  • High Throughput WAN Data Transfer with Hadoop-based Storage
• The commissioning of CMS computing centres in the worldwide LHC comuting Grid (Nuclear Science Symposium Conference Record 2008, NSS '08 IEEE)
• The commissioning of CMS computing centres in the WLCG Grid (ACAT 08, 043, XII Advanced Computing and Analysis Techniques in Physics Research 2008, Erice, Italy) (EGEE-08, Istanbul, Sept. 22-26, 2008)
• Definition and Implementation of a SAML-XACML Profile for Authorization Interoperability across Grid Middleware in OSG and EGEE (Journal of Grid Computing)
• Pilot Job Accounting and Auditing in Open Science Grid (IEEE Grid 2008
• The pilot way to Grid resources using glideinWMS (CSIE 09)
• Reducing the Human Cost of Grid Computing With glideinWMS (Cloud Computing 2011, Paper, Presentation)
• Adapting to the Unknown With a few Simple Rules: The glideinWMS Experience (Adaptive 2011, Paper, Presentation) - Best paper award
• The glideinWMS approach to the ownership of system images in the Cloud world (to be published) (CLOSER 2012, paper, Presentation)
• Published paper on CMS distributed analysis can be found here.

Non-physics computing

Our standard acknowledgements

The computational resources required for this work were accessed via the GlideinWMS? \citep{Sfiligoi2009} on the Open Science Grid \citep{Pordes2008}.

[Sfiligoi2009] Sfiligoi, I., Bradley, D. C., Holzman, B., Mhashilkar, P., Padhi, S. and Wurthwein, F. (2009). "The Pilot Way to Grid Resources Using glideinWMS", 2009 WRI World Congress on Computer Science and Information Engineering, Vol. 2, pp. 428–432. doi:10.1109/CSIE.2009.950.

[Pordes2008] Pordes, R. et al. (2007). "The open science grid", J. Phys. Conf. Ser. 78, 012057. doi:10.1088/1742-6596/78/1/012057.

Open Science Grid Computing

Our group is heavily involved in the Open Science Grid (OSG), a nationwide distributed computing effort aimed at providing Grid computing to the scietific community.

CMS heavily relies on OSG for its computing needs, so a lot of effort is shared between the two.

In this section we present only information that is OSG specific and may not have direct, short term use in CMS.

Roles in OSG:

• Member of the Executive Team (Frank Wuerthwein)
• Leader of the Scalability, Reliability and Usability Area (Igor Sfiligoi)

Major subtasks:

• Running a glideinWMS factory for OSG (Igor Sfiligoi,Jeffrey Dost)
• Scalability and reliability of the storage components (Haifeng Pi)
• Development of monitoring tools (Alison McCrea? )
• Development of scalability tools (Igor Sfiligoi, J.A.P. Coaras)

While OSG usually does not develop software, the OSG scalability etc. work required tools that were not readily available, so new tools have to be developped.

The tools are hosted on sourceforge at http://sourceforge.net/projects/osgscal/.

Publications:

• Using Condor glideins for distributed testing of network-facing services (IWHGA2010 - Preprint)

CorralWMS

Our group is also involved in the development of Grid Workload Management Systems (WMS).

The current R&D effort is oriented toward the development of CorralWMS, an integration of glideinWMS and Corral. The effort is a collaboration of UCSD, Fermilab and ISI.

People active on CorralWMS? :

• Alison McCrea? (undergraduate)
• Miguel Alatorre (undergraduate)
• Eli Moskowitz (undergraduate)
• Ian McNeil? (graduate)
• Igor Sfiligoi (Computing Staff)
• Frank Wuerthwein (faculty)

People that contributed in the past:

• Amir Eibagi (undergraduate)
• Benjamin Christian Boynton (undergraduate)
• Chris Murphy (graduate)
• Jaehyeok Yoo (graduate)
• Tim Kang (undergraduate)
• Tony Myers (undergraduate)
• Robert Chen (undergraduate)
• Eliskhan Sheripon (undergraduate)

JavascriptRRD?

Our group has developped, and is maintaining, a Javascript-based library for reading an plotting RRD databases.

The package is hosted on sourceforge at http://sourceforge.net/projects/javascriptrrd/.

It is currently being used in glideinWMS and CorralWMS? (see above).

People involved from our group:

• Alison McCrea? (undergraduate)
• Igor Sfiligoi (Computing Staff)
• Frank Wuerthwein (Faculty)

Advanced Network and Distributed Storage Laboratory

• Haifeng Pi (Researcher)
• Igor Sfiligoi (Computing Staff)
• Frank Wuerthwein (Faculty)

Physics with CDF

• Rami Vanguri (former undergraduate, now graduate @ UPenn)
• Shih-Chieh Hsu (former graduate student, now Chamberlain Fellowship to work on Atlas at Berkeley since May 2008)
• Matt Norman (former graduate student, now computing infrastructure developer with CMS)
• Elliot Lipeles (former post-doc, starting faculty job at UPenn on June 1st 2008)
• Mark Neubauer (former post-doc. Faculty at UIUC since Fall 2007)
• fkw (faculty)

Bottom line, the CDF effort is winding down. All that's left to do is finish off a couple analyses, and write papers for them.

Public CDF Results from UCSD

• WZ production
  • 2fb update of cross section
  • 2fb Triple gauge couplings - heading for publication now
  • PRL of "First Observation of WZ"
    • The actual PRL publication is here.
• ZZ production
  • First Measurement of ZZ at a hadron collider Phys.Rev.Lett.100:201801,2008
  • 2fb Triple gauge couplings in lljj
• Higgs search
  • 2fb result (Shih-Chieh's thesis)
  • PRL 102 (2009) 021802
• Triple gauge couplings in WW in the lnulnu final state.
• Lambda_b lifetime
  • Measurement of the Lambda_b Lifetime in Lambda_b --> J/psi Lambda0 in p-pbar Collisions at sqrt(s)=1.96 TeV Phys.Rev.Lett.98:122001,2007

Ancient Topcite Publications from my CLEO days

• Observation of B0 decay to two charmless mesons Phys. Rev. Lett. 71, 3922–3926 (1993)
• Observation of B→K±π0 and B→K0π0, and Evidence for B→π+π- Physical Review Letters 85, 515 (2000)
• Measurement of Charge Asymmetries in Charmless Hadronic in B Meson Decays Phys.Rev.Lett.85:525-529,2000
• Search for Exclusive Charmless Hadronic B Decays Physical Review D 53, 1039 (1996)

-- FkW - 2010/04/16 -- FkW - 4 March 2010