Studies of Q^2 using Z+jets data and Alpgen

Introduction

Progress

Sept 6th: [Daniel, Un-ki, Jahred, Sarah] Sarah and Daniel ran jobs at qfactor = 0.5 and 2.0. Reasonable looking results, but some choppiness in distributions at larger Nparton. We will increase the number of iterations to warm up the grid. See plots. Jahred will interface initial results to HEPG-clustering routines so that we can look at number of jets as well

Tools

We have put together code which

Generates Z+np events in Alpgen2, with a modification from MLM which allows us to vary the vertex-by-vertex parameter which controls the emission of radiation.
Converts the Alpgen2 events to HEPG banks in CDF format
Produces TopNtuples from those HEPG files

This code sets these Alpgen generation parameters:

deltaR(jet,jet) = 0.7

deltaR(lep,jet) = 0.0

PDF set CTEQ5L

Q = qfac*sqrt{m0^2+ sum(pt_jet^2)}

ptmin_jet = 20 GeV

ptmin_lep = 1 GeV

etamax_jet = 3

etamax_lep = 5

40 < M_ll < 200

Location/Instructions

A tarball containing the code and CAF scripts is:

fcdflnx4.fnal.gov:/cdf/data50/s0/ntuples/tarballs/alp2hepg/

Instructions for running CAF jobs:

log in to fcdflnx5.fnal.gov
kinit
setup cdfsoft2 development
cd /cdf/data50/s0/ntuples/tarballs/alp2hepg/
perl caf_submit_alpgen_zjets.pl dsetid NperSection outputlocation Npartons LeptonFlavor Iexclusive Qfactor [ FirstSection LastSection]
- dsetid is like XtopYZ (use a dummy name or email danielw@fnal.gov to obtain an official one)
- NperSection is the number of events in each section. ~1000 or 2000 is good.
- outputlocation is userid@host:/dir where your .k5login is set to let you write there from the CAF
- LeptonFlavor is 1 for ee, 2 for mumu
- Iexclusive is 1 for exclusive matching, 0 for inclusive matching
- Qfactor is the alpgen parameter
- First/LastSection let you submit specific sections if you want. Default is 1-100.

Samples

dataset	Npartons	Exclusive?	Qfactor	Files Location
ztop0q	0	1	0.5	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztop1q	1	1	0.5	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztop2q	2	0	0.5	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`

ztop3q	0	1	1.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztop4q	1	1	1.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztop5q	2	0	1.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`

ztopzz	0	1	2.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztopxz	1	1	2.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztopyz	2	0	2.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`

ztop7q	0	1	4.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztop8q	1	1	4.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztop9q	2	0	4.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`

ztopaq	0	1	8.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztopbq	1	1	8.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztopcq	2	0	8.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`

ztopdq	0	1	64.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztopeq	1	1	64.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`
ztopfq	2	0	64.0	`fcdfdata120.fnal.gov:/export/data6/top/mc_gen5/work/caf_res/(dataset)/`