W+jets Samples

Step 0: Pre-Production

Tests of the production script ($SRT_DIST/packages/cardfiles/v00-07-XX/common_alpgen_proposal/tools/CompAlpPI.sh) generating 5k events W+jets samples

Pre-Production samples (see Production page)
Pre-Production certification (see Production page)
Status: Available processes are

W+n jets (0 <= n <=3, wo/ exclusive 1 or 2 c from ME)
W+c+n jets (0 <= n <= 2, wo/ exclusive 2 c from ME)
W+cc+n jets (0 <= n <=1)
W+bb+n jets (0 <= n <=1)

Next:

include the W+4 jets processes

Fix bugs and find possible features of the Production Script before going to large scale production

Step 1: Large Scale Production

Make sure all the MC farms processing those events will overlay equivalent MC min. bias samples (see main page)
Produce the following samples w/ the default cuts:

Process (j=u/d/s/g)	Decay	Factorization Scale	Statistics
W+0j	e+nu mu+nu	Q²0 = M²W + Sum(mT²) Q²0 = M²W	2 x 50k 2 x 50k
W+1j	e+nu+1j mu+nu+1j	" "	2 x 50k 2 x 50k
W+2j	e+nu+2j mu+nu+2j	"	2 x 50k 2 x 50k
W+1c+1j	e+nu+1c+1j mu+nu+1c+1j	Q²0 = M²W + Sum(mT²)	5k 5k
W+2c+0j	e+nu+2c mu+nu+2c	Q²0 = M²W + Sum(mT²)	5k 5k
W+2b+0j	e+nu+2b mu+nu+2b	Q²0 = M²W + Sum(mT²)	5k 5k
W+3j	e+nu+3j mu+nu+3j	Q²0 = M²W + Sum(mT²) Q0 = M²W	2 x 50k 2 x 50k
W+1c+2j	e+nu+1c+2j mu+nu+1c+2j	Q²0 = M²W + Sum(mT²)	5k 5k
W+2c+1j	e+nu+2c+1j mu+nu+2c+1j	Q²0 = M²W + Sum(mT²)	5k 5k
W+2b+1j	e+nu+2b+1j mu+nu+2b+1j	Q²0 = M²W + Sum(mT²)	5k 5k
W+4j	e+nu+4j mu+nu+4j	Q²0 = M²W + Sum(mT²) Q0 = M²W	2 x 50k 2 x 50k
W+1c+3j	e+nu+1c+3j mu+nu+1c+3j	Q²0 = M²W + Sum(mT²)	5k 5k
W+2c+2j	e+nu+2c+2j mu+nu+2c+2j	Q²0 = M²W + Sum(mT²)	5k 5k
W+2b+2j	e+nu+2b+2j mu+nu+2b+2j	Q²0 = M²W + Sum(mT²)	5k 5k
Total			1.09 M

Step 3: ME-PS Matching

This step will occur on the reco'd events. We'll match parton level jets to particle level jets
Test 2 independent implementations of the Mangano's matching prescription

Hints for systematics:

look at the influence of the splitting-merging in our cone jet reconstruction on this matching scheme
compare the MLM matching w/ a CKKW one (S. Mrenna's W(+jets)->enu and Z(+jets)->mumu samples)

Step 4: Samples Normalization

Use either MCFM K-factor to correct Alpgen cross sections or directly MCFM NLO cross section to normalize the Alpgen+Pythia samples
Make 4 global inclusive samples: W(+jets)->enu/munu and Z(+jets)->ee/mumu to compare jets multiplicities, Berends scaling, overall normalization,... wrt to equivalent data inclusive samples
Make exclusive samples (ie: W+3j->enu) to compare to equivalent exclusive data samples

Step 5: Analyses

Last update: SM 28 Apr 04