October 5, 2004 SUSY Meeting -- M.Rossi 1

the Udine approach to

SUSY Multileptons

Udine UniversityM.P.Giordani, G.Pauletta, M.Rossi

October 5, 2004 SUSY Meeting -- M.Rossi 2

Analysis Approach follow same approach of RunI analysis

dilepton trigger 1 tight + 2 loose offline leptons

in this talk: RunII SUSY dilepton trigger Trigger strategy (CDF6074) Towards a good run list: method Cross section studies Conclusions/Plans

October 5, 2004 SUSY Meeting -- M.Rossi 3

Trigger Strategy (1) achieve maximum acceptance/efficiency

SUSY yields leptons through cascade decays leptons typically produced with low pT

multipath dilepton trigger two low pT leptons (baseline) lepton + track (recover stub/cluster inefficiency) Single high pT lepton (best high pT multilepton

efficiency) all paths contribute to acceptance

October 5, 2004 SUSY Meeting -- M.Rossi 4

Trigger Strategy (2) define standard lepton objects

lepton object definitions @ trigger level do not depend on specific trigger path

simplification of trigger calibration compute efficiency for each lepton object combine lepton objects into trigger paths L1 & L2 efficiency can be computed by

comparing single lepton with dilepton paths detector conditions naturally folded in

October 5, 2004 SUSY Meeting -- M.Rossi 5

Data selection

ONLINE bits required to be good: CLC,L1T,L2T,L3T,CAL,COT OFFLINE bits required to be good: COT,CAL From 2002 to 02.13.2004 (no runs with COT problems) Using pre filter data

1324 RUNS, 257 pb-11324 RUNS, 257 pb-1

DQM CRITERIA DQM CRITERIA

October 5, 2004 SUSY Meeting -- M.Rossi 6

Towards a good run list: method

Instead of ~20 trigger paths 6 lepton objects: CEM4, CEM8, PEM8, CMU4, CMUP4, CMX4

Define STANDARD LEPTON OBJECT example: CEM4 = L1_CEM4_PT4 & L2_CEM4_PT4_CES2

Identify suitable monitoring variable Look for suspect runs

GOOD RUN LIST PER LEPTON OBJECT GOOD RUN LIST PER LEPTON OBJECT

October 5, 2004 SUSY Meeting -- M.Rossi 7

TRIGGER PATH = lepton 1 & lepton 2 For each TRIGGER PATH count: D1 : # triggered evts

N1 : " with offline lepton 1

D2 : # triggered evts

N2 : " with offline lepton 2

Towards a good run list: R variable

satisfying STANDARD lepton 1 DEFINITION satisfying STANDARD lepton 1 DEFINITION

satisfying STANDARD lepton 2 DEFINITIONsatisfying STANDARD lepton 2 DEFINITION

R1=N1/D1

R2=N2/D2

sort of purity expect no significant differences between different trigger paths for each lepton type expect stable in time

October 5, 2004 SUSY Meeting -- M.Rossi 8

Towards a good run list: R variable

CEM4

October 5, 2004 SUSY Meeting -- M.Rossi 9

Test for R indipendence of trigger path for each lepton type 1. For each run compute R average of all paths for each lepton type Rlepton

2. R = value for the single trigger path if |R-Rlepton| > 5σ , then the run is suspect

Test for R stability in time 1. Compute local average of Rlepton over 20 runs

before and after <Rlepton>

2. If |Rlepton - <Rlepton>| > 5σ , then the run is suspect

Towards a good run list: suspect run

October 5, 2004 SUSY Meeting -- M.Rossi 10

First estimate of suspect run luminosity for CEM4 lepton object is 0 pb-1

Towards a good run list: suspect run

RCEM4

October 5, 2004 SUSY Meeting -- M.Rossi 11

Trigger cross sections

complementary trigger path studies: L2 exclusive cross sections

L2 instantaneous luminosity dependence

PHYSICS_2_01_v4 (Feb. 2004)L2_CEM8_PT8_CES2_&_TRK8L2_TRK8_L1_CMUP6_PT4L2_CEM12_PT8

PHYSICS_2_05_v10 (June 2004)L2_CEM8_PT8_CES3_&_TRK8L2_CMUP6_PT8L2_CEM8_PT8_CES3_DPS

October 5, 2004 SUSY Meeting -- M.Rossi 12

Exclusive TotalExclusive Total

L2_CEM8_PT8_CES2_&_TRK8 4% 100 nb L2_TRK8_L1_CMUP6_PT4 32% 180 nb L2_CEM12_PT8 20% 250 nb

Using L3 Monitor dataset (MONITOR_L3TAG_PS200)calculated L2 complementary trigger path cross sectionsUsing L3 Monitor dataset (MONITOR_L3TAG_PS200)calculated L2 complementary trigger path cross sections

Trigger cross sections

October 5, 2004 SUSY Meeting -- M.Rossi 13

Events

Lint (nb-1)

σ (nb)σ (nb)

Events

Lint (nb-1)

L2_CEM12_PT8 L2_CEM8_PT8_DPS

Trigger cross sections

October 5, 2004 SUSY Meeting -- M.Rossi 14

Conclusions Monitoring strategy almost defined

Variables (R) behaves as expected

Stable in time Steps correlated to trigger table changes Good run list on the way Very low rejection based on R Comparison with evaluation based on rate underway Trigger cross section studies in progress High degree of overlap our complementary and other triggers Implications depend on future choices of TDWG

October 5, 2004 SUSY Meeting -- M.Rossi 15

Next

Per lepton object: Finalize good run list Calculate efficiency