Paul Brian Geffert
Position
Graduate Student Researcher
A link to my CV.
Physics
A Search for New Physics in b-tagged dijet and multi-jet events with Missing Energy in pp collisions at 7 TeV
(alpha_T + b-tag)
CMS SUS-10-011 (RA1b)
I was responsible for setting the limits in a SUSY search in the single lepton + jets + MET channel.
CMS SUS-12-10 (RA4)
SUSY search in single lepton + jets + MET + multiple b-tags
CMS SUS-13-007 (RA4b)
A public version of the analysis has been posted.
The paper has been submitted to Physics Letters B.
Physics Talks
CMS Leptonic SUSY Meeting 9/24/09:
Correlation Between alphaT and HT
CDF SUSY Meeting 2/24/10:
Correlation Between alphaT and HT in Z+jet Events
CMS SUSY Meeting 4/27/10:
alphaT and its HT Dependence in 7 TeV Data
CMS SUSY Meeting 6/10/10:
alphaT and its HT Dependence in 7 TeV Data
CMS SUSY Meeting 7/06/10:
alphaT and its HT Dependence in 7 TeV Data: Update with more Data
CMS SUSY Meeting 11/09/10:
Pre-approval talk: Hadronic search with alphaT (RA1)
I presented slides 45-68 of this talk.
CMS SUSY Meeting 1/11/11:
Pre-approval talk: Hadronic search with alphaT and b-tagging (RA1b)
CMS SUSY Meeting 1/27/11:
Pre-approval Follow-up: Hadronic search with alphaT and b-tagging (RA1b)
CMS General Weekly Meeting 2/23/11:
Approval talk: SUS-10-011 Search for New Physics in b-tagged di-jets and multijets events with Missing Energy (RA1b)
APS April Meeting, LHC SUSY searches section 5/1/11:
Search for New Physics using the alphaT variable in multi-jet events using b-tagging
CMS SUSY Single Lepton analysis meeting 4/24/12:
RA4 Lepton Polarization and Lepton Spectrum Simplified Model limit comparison
Joint presentation with Loukas Gouskos. I presented slides 18-28.
CMS Single Lepton SUSY Working Group 8/8/12
Data/MC comparison in Z events
CMS Single Lepton SUSY Working Group 8/15/12
Data/MC Comparisons in Single Lepton Sample
CMS Single Lepton SUSY Working Group 8/22/12
Data/MC Comparisons with Single Lepton Triggers
CMS Single Lepton SUSY Working Group 8/29/12
IsoMu24 Isolation Efficiency
CMS Single Lepton SUSY Working Group 9/26/12
RA4 Signal and Control Sample Yields in MC
CMS Single Lepton SUSY Working Group 10/24/12
Di-lepton background prediction
CMS Single Lepton SUSY Working Group 1/9/13
RA4 Lepton Spectrum Update
CMS Leptonic SUSY 2/1/13
SUS-13-007 Pre-approval: Single lepton SUSY
This talk was jointly given with Markus Stoye. I presented up until slide 36.
CMS Single Lepton SUSY Working Group 3/13/13
First Look at T6ttWW, RA4 LS
CMS Single Lepton SUSY Working Group 4/24/13
RA4 LS: First look at T1t1t and T5tttt models
CMS Single Lepton SUSY Working Group 5/1/13
ISR and PDF Uncertainties for RA4 LS
CMS Single Lepton SUSY Working Group 5/22/13
T1t1t and T5tttt LS Limits
Hardware
I am currently working on research and development for a fast, radially oriented, scintilating-fiber tracker with high granularity Silicon Photomultiplier readout. This concept was developed by David Stuart and is documented here. We are building a prototype device for which I am responsible for multiple tasks: develop data acquisition system/software using Embedded Linux devices (i.e. Beaglebone Black boards); design and test ADC signal processing circuitry; design of various aspects of the mounting/support structure for the readout electronics.
While I was living at CERN for 2.5 years, I worked on the HCAL sub-detector of CMS. I was primarily focused on quality assurance testing and characterization of the Silicon Photomultipliers (SiPM) to be installed in the Hadronic Outer (HO) partition during LS1. I spend a smaller portion of time on the analysis of single photo-electron (SPE) quality assurance data for the multi-anode PMTs to be installed in the Hadronic Forward (HF) partition during LS1.
Talks:
CMS HCAL DPG 8/15/11:
First look at pulse timing studies
CMS HCAL PFG2 8/30/11:
New energy reco - Use of pulse timing
CMS HCAL PFG2 9/6/11:
New energy reco - Pulse shape template fit
CMS HCAL DPG 9/26/11:
Signal processing
CMS HCAL PFG2 11/08/11:
Pulse Energy Reconstruction with Weights
CMS HCAL Integration 3/27/12:
Results from B28 data taking (Shared talk with Aram Apyan)
CMS HCAL General Meeting 6/26/12
HO SiPM studies at 904
CMS HCAL Integration and Upgrade 8/21/12
SiPM Calibration Variables
This talk was jointly given with Sabrina Pasterski. I presented from slide 26 onwards.
CMS HCAL Integration and Upgrade 10/2/12
Quick look at the Iowa HF data in WBM
CMS HCAL Integration and Upgrade 10/23/12
HO Test Stand Data in WBM
CMS HCAL HO burn-in -- test stand 11/5/12
HO 904 Gain and Breakdown Voltage Correlation Plots
CMS HCAL Meetings during December 2012 CMS Week 12/11/12
Voltage Scan Analysis for HO Burn-In
CMS HCAL Installation, Integration and Commissioning 1/21/13
SPE Gain for Problem PMTs
CMS HCAL Installation, Integration and Commissioning 2/4/13
Information about bat.904 SPE Fits
CMS HCAL Installation, Integration and Commissioning 2/11/13
b904 SPE Fits: LED Intensity Study
CMS HCAL Installation, Integration and Commissioning 2/25/13
b904 SPE Data: A Closer Look
CMS HCAL Installation, Integration and Commissioning 3/4/13
b904 SPE Data: A Closer Look
CMS HCAL Installation, Integration and Commissioning 3/11/13
b904 SPE Data: Updated Fit
CMS HCAL Installation, Integration and Commissioning 3/25/13
b904 SPE Data: Follow up to updated fit
CMS HCAL Installation, Integration and Commissioning 4/15/13
b904 SPE Fits: 650 vs 700V Correlation plots with V2 and V3
CMS HCAL Installation, Integration and Commissioning 9/2/13
SPE Fits: Study use of Gamma Distribution
Papers/Documents
CMS Analysis Note: CMS AN-2009/155. Updated 1/11/10:
Correlation Between alphaT and HT in Z+jets Events
CDF Note 10131: Posted 4/15/10:
Correlation Between alphaT and HT Using Z+jets Events at CDF II
CMS Analysis Note: CMS AN-2010/157. Updated 7/14/10 (v6):
alphaT and its HT Dependence in 7 TeV Data
CMS Physics Analysis Summary: CMS PAS SUS-10-001. Posted 7/21/10
Performance of Methods for Data-Driven Background Estimation in SUSY Searches
This is a public document representing the work of many people in the CMS SUSY group. I contributed figure 2, which shows the HT dependence of alphaT in various samples.
This work was described in the ICHEP talk Early LHC data preparations for beyond-the-standard-model searches at CMS given by Didar Dobur on July, 23 2010.
CMS Analysis Note: CMS AN-2010/338. Updated 3/14/11:
SUSY Search in b-tagged Multi-jet Events
CMS Physics Analysis Summary: CMS PAS SUS-10-011. Public 4/13/11
Search for Supersymmetry in Final States with b Jets and Missing Energy at the LHC
CMS Paper: SUS-10-011. Published by JHEP 7/26/11. Volume 2011, Number 7, 113, DOI: 10.1007/JHEP07(2011)113
Search for supersymmetry in events with b jets and missing transverse momentum at the LHC
CMS Physics Analysis Summary: CMS PAS SUS-11-015. Public 9/9/11
Search for supersymmetry in pp collisions at sqrt(s)=7 TeV in events with a single lepton, jets, and missing transverse momentum
CMS Paper: SUS-12-010. Published by European Physics Journal C 5/8/13. Volume 73, Issue 5, DOI: 10.1140/epjc/s10052-013-2404-z
Search for supersymmetry in pp collisions at sqrt(s)=7 TeV in events with a single lepton, jets, and missing transverse momentum
CMS Analysis Note: CMS AN-2012/416. Updated 6/12/12:
Search for supersymmetry in proton-proton collisions at sqrt(s)=8 TeV in events with a single lepton, b-jets, and missing transverse momentum
CMS Physics Analysis Summary: CMS PAS SUS-13-007. Public 3/7/13
Search for supersymmetry in pp collisions at sqrt(s)=8 TeV in events with a single lepton, multiple jets and b-tags
CMS Paper: SUS-13-007. Submitted to Physics Letters B on 11/20/13. arXiv:1311.4937
Search for supersymmetry in pp collisions at sqrt(s) = 8 TeV in events with a single lepton, large jet multiplicity, and multiple b jets
My home page when I was an undergraduate at Texas A&M is here.
Address
Office: Broida 5122
Mail: Physics Department
University of California
Santa Barbara, CA 93106-9530
Phone: (805)893-3125
FAX: (805)893-8597
E-Mail: pbgeff@hep