CDS comments on supporting note

CDS CDS comments on comments on supporting supporting

notenote

Zhijun LiangZhijun Liang

Comments from EBComments from EB• What is GRL used ?What is GRL used ?• WZjets_allchannels from W/Z groupWZjets_allchannels from W/Z group

• Does Does Alpgen and Sherpa MC signal samples Alpgen and Sherpa MC signal samples include all the diagrams ?include all the diagrams ?• Yes, FSR/ISR/frag photons are included.Yes, FSR/ISR/frag photons are included.

• How to treat Lar hole for electron and photons? How to treat Lar hole for electron and photons? • In MC , In MC , • Use Use pseudo-random run number to pseudo-random run number to

associate one MC event to one data taking associate one MC event to one data taking period, period,

• Use object quality Map of that data taking Use object quality Map of that data taking period for e/gamma selectionperiod for e/gamma selection

Comments from EBComments from EB• Where parton-> photon fragmentation effect is Where parton-> photon fragmentation effect is

included? in Awg/zg, Cwg/zg?included? in Awg/zg, Cwg/zg?o The ALpgen/Sherpa simulation have included The ALpgen/Sherpa simulation have included

photon fragmentation diagram in Matrix photon fragmentation diagram in Matrix element calculations,element calculations,

o Since we are using simulation Monte Carlo to Since we are using simulation Monte Carlo to calculate Awg/zg, Cwg/zg,calculate Awg/zg, Cwg/zg,

o parton-> photon fragmentation effect has parton-> photon fragmentation effect has been included and taken care in Awg/zg, been included and taken care in Awg/zg, Cwg/zg.Cwg/zg.

o (photon fragmentation contribution mainly (photon fragmentation contribution mainly have impact on Cwg/zg, almost no impact on have impact on Cwg/zg, almost no impact on Awg/zg).Awg/zg).

Comments from EW conveners Comments from EW conveners

• How do you treat Tau decay channel ?How do you treat Tau decay channel ?o Consider as background.Consider as background.o It is a tiny background, subtract them using It is a tiny background, subtract them using

Monte CarloMonte Carlo• Trigger matching and apply trigger scale factor?Trigger matching and apply trigger scale factor?

o tiny effect in electron channel. tiny effect in electron channel. o Update this effect for muon channel in the noteUpdate this effect for muon channel in the note

• only one lepton in the event for Wgamma?only one lepton in the event for Wgamma?o Describe Z veto cut in more details , what is Describe Z veto cut in more details , what is

quality cut to veto events with two leptons.quality cut to veto events with two leptons.• Isolation scale factor and systematicIsolation scale factor and systematic

o Scale factor =1 , move part of photon isolation Scale factor =1 , move part of photon isolation discussion into electron isolation sectiondiscussion into electron isolation section

Question on the plotQuestion on the plot

Why MC error bar are large ? (include systematic error)

What is error on data driven method, is that consistent with EgammaRecommendations ?

Data driven photon Data driven photon efficiencyefficiency

Purity comes from MC ? Or Data ?

What is the error bar on the purity?

Question to muon Question to muon channel photon jet channel photon jet

backgroundbackground• You have mentioned the Muon isolation shape is determined You have mentioned the Muon isolation shape is determined

from control regionsand normalized in the signal region. from control regionsand normalized in the signal region. o How the normalization is implemented?How the normalization is implemented?o Did you just use ptcon/pt>0.2 region for normalization?Did you just use ptcon/pt>0.2 region for normalization?

• L659 - L664 You said template method is similar to ABCD L659 - L664 You said template method is similar to ABCD method. Could you describe the difference in the note?method. Could you describe the difference in the note?o In ABCD method, you have a correction of the signal in In ABCD method, you have a correction of the signal in

BCD region,BCD region,o did you apply the same correction in the template did you apply the same correction in the template

method?method?

Question to electron channel Question to electron channel photon jet backgroundphoton jet background

• Question:Question:o I expect non-isolated electron to isolated electron is a measure of I expect non-isolated electron to isolated electron is a measure of

heavy flavor jet electron background.heavy flavor jet electron background.o To estimate light jet electron background, we normally use (!To estimate light jet electron background, we normally use (!

Medium & Loose) as denominator to extrapolate to Tight Medium & Loose) as denominator to extrapolate to Tight electron. Could you describeelectron. Could you describe

• AnswerAnswero Unlike muon channel, heavy flavor is not the main contribution.Unlike muon channel, heavy flavor is not the main contribution.o Electron fake mainly comes from hadron fake ( some fraction of Electron fake mainly comes from hadron fake ( some fraction of

heavy flavor).heavy flavor).o Both hadron fake and heavy flavor are likely to fail isolation cut Both hadron fake and heavy flavor are likely to fail isolation cut

o A cross check with (!Medium & Loose) needed (for A cross check with (!Medium & Loose) needed (for pT(g)>15GeV) ? pT(g)>15GeV) ?

• What is the point for this plot ?What is the point for this plot ?• Can we have log scale plot ?Can we have log scale plot ?

Question on the plotQuestion on the plot

Comments on cross Comments on cross sectionsection

• i) page 52: I got really lost about Awg/zg i) page 52: I got really lost about Awg/zg description .description .o Could you define it on page 52 very explicitly.Could you define it on page 52 very explicitly.o My confusion is about "parton-level -> particle My confusion is about "parton-level -> particle

level" discussionlevel" discussion

Comments on ATGC Comments on ATGC • Sec 7/8 Zgamma/Wgamma aTGCSec 7/8 Zgamma/Wgamma aTGC

o The method of TGC extraction between The method of TGC extraction between Wgma/Zgam is the same.Wgma/Zgam is the same.

o Please combine sec 7/8 to one section to have Please combine sec 7/8 to one section to have a common description of the methodology.a common description of the methodology.

o You have described in the order of You have described in the order of Wgam/Zgam in earlier section.Wgam/Zgam in earlier section.

o Please continue this order in the TGC section.Please continue this order in the TGC section.

Open issue Open issue • Why muon channel need |Vz|<200mm, what is Why muon channel need |Vz|<200mm, what is

the efficiency of that cut ?the efficiency of that cut ?

• L973, MCFM is NLO in alpha_s, I think you need L973, MCFM is NLO in alpha_s, I think you need to make the argument clearer why to use the 0 to make the argument clearer why to use the 0 jet bin.jet bin.

• l992: Is an estimate available on the theory error l992: Is an estimate available on the theory error for the photon fraction from fragmentation?for the photon fraction from fragmentation?

Open issue Open issue • Also two-dimensional fits for neutral and charged aTGCs, Also two-dimensional fits for neutral and charged aTGCs,

where you allow two aTGCs to vary and plot the 95% where you allow two aTGCs to vary and plot the 95% contours would be nice (CMS had that). However, if it contours would be nice (CMS had that). However, if it would take too long, I would not insist on that. would take too long, I would not insist on that.

• L546 You stated that "fragmentation of pi0->2photon L546 You stated that "fragmentation of pi0->2photon pass the photon isolation threshold is counted as part of pass the photon isolation threshold is counted as part of the signal". the signal". o However, you have subtracted W+jet->photon However, you have subtracted W+jet->photon

background using data-driven method.background using data-driven method.o Don't you overestimate the acceptance and efficiency Don't you overestimate the acceptance and efficiency

by including this fragmented photon as the signal?by including this fragmented photon as the signal?