DOE REVIEW AUGUST 2006: CDF GROUP AT HARVARD

MELISSA FRANKLIN - PROF

JOAO GUIMARAES DA COSTA---PROF 25%

SEBASTIAN GRINSTEIN - POST-DOC

DANIEL SHERMAN - GRAD STUDENT - 2007

INGYIN ZAW - GRAD STUDENT- 2007

JOHN PAUL CHOU - GRAD STUDENT -2008

AYANA HOLLOWAY - GRAD STUDENT 2006*SAL RAPPOCCIO - GRAD STUDENT 2005*

agendaIntroduction/overview/a little physics -melissa franklin

Something about silicon, recent past and future- sebastian grinstein

The top quark production cross-section - daniel sherman

The soft lepton tagger - john paul chou

Flavor changing neutral currents involving top - ingyin zaw

Plans for the coming year - joao guimaraes da costa

STATE OF CDFExpect run2 to last through roughly 2009

Silicon will be fine

COT will turn off DE/dx

Peak luminosity :1.75 * 10 **32

record integrated luminosity: 27 inverse pb per week ( 1 fb per year)

Number of interactions per crossing =2

STILL UPGRADES TO DAQ, TRIGGER- good for students

Number of working people dwindling - must support running of detector

measurements coming in snippets

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Steeper and steeper - cdf gets interesting- what can we learn?

Contributions to cdf--central tracker construction, installation, commissioning, online monitoring ( stage0), drift model

--central muon detector extension : cmx:design, construction, commissioning, online, upgrades, reconstruction code

--silicon detector, silicon daq: positioned and surveyed all ladders, designed and built silicon readout controller src. large role in commissioning, maintaining, three upgrades to src

--beamline :code to find cdf beamline automatically for use in almost all analyses

--primary vertex algorithm : design, code and implementation

--b-tagging: large contributions to present svx b-tagger, wrote run2 code, new loose b-tagger, increased efficiency by 20+20%, soft lepton tagging

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Bs mixing limit depended on primevtx written by Harvard

Much work on w+jets+b-tags

Over three years8 people (really everyone in the group in one

way or another)Taggers:secvtx tight, loose, soft lepton tag, tag efficiency, mistag matrix, backgrounds,

MC, W + heavy flavorTop cross-section major contribution to

physicsImpacts many analyses:

Top mass, top properties,Higgs search, etc

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Need cross-section for top mass

Search for new physics in the top sample

Top quark lifetime***FCNC TT-->ttXHiggs

Top lifetime measurement --> d0 of lepton

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Cross-check provides first measurement of tau lifetime from CDF:

Top life time First direct limit on the top quark lifetime We select tt-bar events by identifying an electron/muon and a secondary vertex (secvtx) tagged jet in events with >= 3 jets and large missing energy. In such events, the impact parameter (d0) of the lepton should be typically very small. Its distribution can be predicted from (1) the resolution of d0 measurements for high momentum lepton tracks, (2) the characteristics of standard model top quark decays, and (3) the magnitude and d0 distribution of non tt-bar backgrounds. Inconsistency between the predicted distribution and our observation could be indicative of a new, long-lived background to tt-bar, anomalous top production by a long-lived parent particle, or a large t lifetime. Using electron and muon tracks produced in Z0/γ -> e+e-/μ+μ- events to determine the detector resolution, we show that the lepton d0 distribution in top candidate events from 318 pb-1 of CDF data is consistent with expectations, and derive a limit on the top quark lifetime:cτt < 52.5 μm @ 95% C.L.cτt < 43.5 μm @ 90% C

blessed analyses 2006Top lifetime - done. paper in progress

Top cross-section with secondary vertices: 395pb-1 paper written + published, 700pb-1 blessed

1fb-1 top cross-section imminent when we get the generation of the MC samples right

Limit on the production of TTX this fall

Limit on FCNC this fall

Measurement of top cross-section using SLTagger: winter

Cdf notes this past yearTitle: SecVtx Electron-Method Scale Factor for Summer 2006 Author(s): Grinstein, Guimaraes da Costa, Holloway, Sherman Title: SecVtx Tag Compositi on Studies with 1/fb Author(s): Guimaraes da Costa, Sherman Title: Study of SecVtx Fake Rates with 1/fb Author(s): Guimaraes da Costa, Sherman Title: Measurement of the Top Pair Production Cross Section in 700/pb with Loose SecVtx Author(s): Guimaraes da Costa, Sherman Title: Combined Measurement of the Top Pair Production Cross Section and SecVtx Scale Factor in 700/pb Author(s): Guimaraes da Costa, Sherman Title: Combination of the SECVTX b-Tagging Scale Factors for Winter 2006 Analyses Author(s): Neu, Jeans, Hill, Garberson, Sherman, Grinstein, Guimaraes da Costa, Holloway Title: The Iterative Seed in PrimeVtx Author(s): Burkett, Guimaraes da Costa, Sherman Title: Measurement of the Top Production Cross Section in using Lepton + Jets Events Author(s): Joao Guimaraes da Costa, Title: The ttbar production cross section with SecVtx b-tags in 318 pb-1 of lepton+jets data Author(s): Joao Guimaraes da Costa, Daniel Sherman, Salvatore Rappocio, Melis sa Franklin, Andy Foland Title: Measurement of the Top Pair Production Cross Section with Loose SecVtx Author(s): Foland, Franklin, Guimaraes, Rappoccio, Sherman Title: First direct limit on the t quark lifetime Title: Silicon DAQ Software Author(s): Sebastian Grinstein Title: Status of the CDF Silicon Detector Author(s): Sebastian Grinstein, The CDF Silicon Operations Group Title: Va lidating QQ Branching Fractions and Lifetimes for B-Tagging Author(s): John Paul Chou, Joao Guimaraes da Costa Title: To p Lifetime from Templates Author(s): A. Holloway, M. Franklin Title: To p lifetime from templates: Backgrounds Author(s): A. Holloway, M. Franklin Title: To p lifetime from templates: Resolution Author(s): A. Holloway, M. Franklin

cdf group in the twilight years

Melissa Franklin

Joao Guimaraes da Costa 25%

Sebastian Grinstein

John Paul Chou

New student?

(taking care of Silicon DAQ and continuing hi-pt W +jet studies and discovering really really new physics)

integrated luminosity

Steeper and steeper ; 2-3fb-1 this funding year