EWK Drell-Yan: Status and Plans

Dimitri BourilkovDimitri BourilkovUniversity of FloridaUniversity of Florida

General EWK Meeting, CERN, July 21,General EWK Meeting, CERN, July 21, 2008 2008

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 2

Drell-Yan Meetings 3 & 4

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 3

Top-pair background in e+e- - eμ study

• Vincent Dero, Pascal Vanlaer

• top-pair background very important

• Can be estimated with eμ events

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 4

Top-pair background in µ+µ- - b tags

• Jonatan Piedra (TevMu)

• top-pair background sizable

• Estimation using b-tags

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 5

Efficiency – Tag & Probe

• Chang Liu (Purdue)

• Reconstruction & Trigger efficiencies> T & P at Z peak in good shape

> To do – off peak DY

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 6

Dilution Corrected AFB

• Sample size is about 50-100 pb-1 data.

• Do event-by-event correction of the dilution, select events with |y|>0.75.

Ping Tan, Dan Green

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 7

Mass Resolutions & Corrections for Smearing

• Obtained the mass resolution from MC at this moment, including both momentum resolution & FSR effect.

• Core Gaussian width is

0.027+0.0104 m0

Ping Tan, Dan Green

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 8

Z+Jets – PAT Analysis

• Analysis of Z+Jets (Chowder) using Physics Analysis Toolkit (PAT): Monika Jindal, Kajari Mazumdar, Jasbir Singh

• Invariant Mass Distribution of Dimuons

• Selection criteria applied : Tracker isolation has been used with

• Sumpt <3.0 Gev in deltaR = 0.3

• No. of muons must be >=2

Muons must be oppositely charged with

• cosDf between two muons <=-0.5

• Comparison of Invariant Mass for Z/tt/W + Jets process

• In case of Z+jets , there is cut of m_ll <40 and m_ll >200 at the Generation level

• (Events have been normalized to 1.0

• to compare the shape)

D.BourilkovD.Bourilkov EWK Drell-Yan: Status 9

What Next

• TWIKI page: https://twiki.cern.ch/twiki/bin/view/CMS/TWikiEWKDrellYan

• Hypernews: hn-cms-ewk-drellyan@cern.ch • Studies with CMSSW_2_0_X well underway

• Studies with CMSSW_2_1

• PAT analyses

• Explore 10 TeV

• Run on real data including tracker from CRUZET3 and CRAFT