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Revision 222010-12-20 - ViktorKonoplianikov

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25.11.10: Draft of CMS IN "HF calibration by physical processes" (ed. V.Konoplianikov)

Work is devoted a choice of the HF calibration technique.
It includes, basically, results of the researches spent in 2006-2008 years.
Draft of CMS IN

18.12.10: Search of calibration coefficients for HF ETA-rings (ed. V.Konoplianikov)

Method: missing ET minimization.

Fig.1. All events given by Robert and Rahmat without any selections:
325700 gamma+jet events with leading jet in HF, ETjet > 15 GeV.
Ambiguity of Ci in the HF region. Their strong dependence on ETgamma.
Fig.1. Ci vs. ETA_i.

Fig.2. 70 events with ETmissing > 100 GeV are excluded.
At the ETgamma = 80, 90 and 100 GeV values of Ci coincide within an error.
Fig.2. Ci vs. ETA_i.

Following 4 plots illustrate effect of missing ET minimization.
Fig.3. Missing ET distribution without correction.
Fig.4. Missing ET distribution with correction Ecor_i = Ci * Ei, i=1,...41.
Fig.5. ETmissing*ETmissing distribution without correction.
Fig.6. ETmissing*ETmissing distribution with correction Ecor_i = Ci * Ei, i=1,...41.

The following plot illustrate ET-activity in different regions of HCAL.
Fig.7. Average values of ET in different ETA rings of HCAL.

Conclusions.
1. There is not enough statistics at the ETgamma > 60 GeV.
Possibly, it can be raised selecting not only events with leading jet in HF, but also events with ETjet > 15 GeV in HF.
2.Possibly, it is necessary to raise cut on HCAL cells. For example ETcell > 0.8 GeV.

 

"QCD Photon Status..." at QCD Meeting 26.01.10

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Revision 212010-12-18 - ViktorKonoplianikov

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25.11.10: Draft of CMS IN "HF calibration by physical processes" (ed. V.Konoplianikov)

 
Added:
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Work is devoted a choice of the HF calibration technique.
It includes, basically, results of the researches spent in 2006-2008 years.
Draft of CMS IN

18.12.10: Search of calibration coefficients for HF ETA-rings (ed. V.Konoplianikov)

Method: missing ET minimization.

Fig.1. All events given by Robert and Rahmat without any selections:
325700 gamma+jet events with leading jet in HF, ETjet > 15 GeV.
Ambiguity of Ci in the HF region. Their strong dependence on ETgamma.
Fig.1. Ci vs. ETA_i.

Fig.2. 70 events with ETmissing > 100 GeV are excluded.
At the ETgamma = 80, 90 and 100 GeV values of Ci coincide within an error.
Fig.2. Ci vs. ETA_i.

Following 4 plots illustrate effect of missing ET minimization.
Fig.3. Missing ET distribution without correction.
Fig.4. Missing ET distribution with correction Ecor_i = Ci * Ei, i=1,...41.
Fig.5. ETmissing*ETmissing distribution without correction.
Fig.6. ETmissing*ETmissing distribution with correction Ecor_i = Ci * Ei, i=1,...41.

The following plot illustrate ET-activity in different regions of HCAL.
Fig.7. Average values of ET in different ETA rings of HCAL.

Conclusions.
1. There is not enough statistics at the ETgamma > 60 GeV.
Possibly, it can be raised selecting not only events with leading jet in HF, but also events with ETjet > 15 GeV in HF.
2.Possibly, it is necessary to raise cut on HCAL cells. For example ETcell > 0.8 GeV.

 
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Revision 202010-12-02 - AlexanderFedotov

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"QCD Photon Status..." at QCD Meeting 26.01.10

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Revision 192010-11-19 - AlexanderFedotov

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  snapshot 15.11.10 14:36 ]] -- a version entitled "HF calibration using physical events"
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17.11.10: First draft of CMS IN "HF calibration using physical processes"

 
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"QCD Photon Status..." at QCD Meeting 26.01.10

Revision 182010-11-16 - AlexanderFedotov

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Revision 172010-11-14 - AlexanderFedotov

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05.11.10: talk "Gamma+Jet Update: HF calibration using gamma + jet"

The talk at Forward Calibration meeting

14.11.10: a note "Calibration of the CMS forward calorimeters by physical events ("hf-cal.pdf")

 

"QCD Photon Status..." at QCD Meeting 26.01.10

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Revision 162010-11-05 - AlexanderFedotov

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  the version from 02.11.10]] exactly corresponding to the above mail
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Revision 152010-11-03 - AlexanderFedotov

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  Viktor.

AF: local copies of Viktor's files:

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Revision 142010-11-02 - AlexanderFedotov

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 http://cdsweb.cern.ch/record/934069/files/NOTE2006_042.pdf , dom2
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V.Konoplyanikov: an explanation of HCAL calibration method ("30aug06.pdf")

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V.Konoplyanikov: Oct 2010 and later on

22.10.10: talk "Gamma + jet: Photon and parton PT imbalance"

The talk as given at the Forward Calibration meeting

An explanation of HCAL calibration method ("30aug06.pdf")

  According to Viktor, the document is based on slides shown in a talk in Dubna given on 30aug06. Explained here is the calibration method used for 2007
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mail AF -> NA,JD,VK: The discussion between VK,AF

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CMS NOTE 1999/038 E. Doroshkevich, V. Gavrilov, "Calibration of HF based on minimisation of missing Et"

http://cms-secr.web.cern.ch/cms-secr/documents/99/note99_038.pdf

mail AF -> NA,JD,VK: The discussion between VK,AF

  Date: Thu, 28 Oct 2010 02:04:14 +0200 (CEST)
From: Alexander Fedotov <fedotov@mail.cern.ch>
Line: 107 to 127
 Cheers, Sasha
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02.11.10 "HF calibration with gamma + jet" -- a doc for discussion ("kon2nov10.pdf")

 
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02.11.10 VK -> NA,AF,JD,VG

 
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Date: Tue, 2 Nov 2010 17:36:56 +0100
From: Viktor Konoplianikov <kon@mail.cern.ch>
To: nural.akchurin@ttuNOSPAMPLEASE.edu, fedotov@mailNOSPAMPLEASE.cern.ch, jdamgov@fnalNOSPAMPLEASE.gov,gavrilov@mail.cern.ch
Subject: gamma+jet and HF

Dear colleagues,

I suggest to look at the report of Semenov 2006:

and my new plots for diskussion: Plots are received with events of 2006.

I can count coefficients C_i on new productions or under the real data. I badly know CMSSW. I without problems will calculate C_i if to me someone makes calculation for approximately 100 000 events according slide 4 ("2th method"):
http://cmsdoc.cern.ch/~kon/old/gj-imb/kon2nov10.pdf:
E_x^ECAL, ETAjet, E^x_1, ... E_x_41
and
E_y^ECAL, ETAjet, E^y_1, ... E_y_41 for |ETA_index|=1,... 41
on a format:
http://cmsdoc.cern.ch/~kon/old/gj-imb/x.dat
http://cmsdoc.cern.ch/~kon/old/gj-imb/y.dat

Viktor.

AF: local copies of Viktor's files:

S.Semenov, A.Ulyanov 15.09.06 "HCAL calibration using gamma+jets events"

Talk at the 11th Annual RDMS CMS Collaboration Conference : pdf , ppt

 
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http://cms-secr.web.cern.ch/cms-secr/documents/99/note99_038.pdf

 
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Revision 132010-10-28 - AlexanderFedotov

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  -- AlexanderFedotov - 26-Jan-2010
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  a snapshot]] made 27.10.10 -- a shrinked version (Viktor has removed some "insignificant" pages)
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mail AF -> NA,JD,VK: The discussion between VK,AF

Date: Thu, 28 Oct 2010 02:04:14 +0200 (CEST)
From: Alexander Fedotov <fedotov@mail.cern.ch>
To: "Akchurin, Nural" <nural.akchurin@ttu.edu>
Cc: Viktor Konoplianikov <kon@mail.cern.ch>, Jordan Damgov <jdamgov@fnal.gov>
Subject: The discussion between VK,AF (Re: lost connection)

On Wed, 27 Oct 2010, Akchurin, Nural wrote:

> I hope you continued the discussions. If so, can someone summarize it

Hi all,

I think I can summarize Viktor's comments on the "30aug06.pdf" document
(http://cmsdoc.cern.ch/~kon/old/gj-imb/30aug06.pdf
is now a new 8-page version without some "insignificant" pages contained earlier).

Pages 4,7: presented are calibration results with a strong ET(gamma) dependence (two sets differ by selections); they are similar to the plot shown on Friday.

Page 6 (a formula above the plot to be ignored): shows the average values of ET (zero responses included) contained in an (HCAL?) eta ring (tower) for events used in a calibration. The energies are quite small. Sorry, I already forgot Viktor's comments on that.

Page 8 : the calibration is done for ET=~60 selecting only events with the jet in HE. This can be compared with the "all events" case on p.7. There is a big difference in the HB region: the corrections become few times smaller on p.8 where jets are absent and calibration is done in the HB region based on some soft stuff in the calo.

This has to demonstrate that the method may lead to an underestimation of the corrections due to inclusion of quasi-empty areas of the calo into the fit. According to Viktor, this was one of the reasons to abandon the method, and to start thinking of compact jets balancing the photon.

Now my own first toughts of this strange effect.

The question arises why does the method try to suppress the areas of soft response.
The HCAL is unlinear: the softer a probe is, the more undermeasured its energy is. Then why the method does not try to compensate for that with bigger corrections, and goes in the opposite direction?
Is it a noise response that the method suppresses?
Or, may be, it is a real soft signal, most of which is just lost under the cell threshold (of order of 1 GeV?), and only the cases where it strongly fluctuates to bigger values above the threshold, get (over)measured?

BTW, such effects may be important for any method...
I hope the answers are already known to somebody...

Cheers, Sasha

 

CMS NOTE 1999/038 E. Doroshkevich, V. Gavrilov, "Calibration of HF based on minimisation of missing Et"

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V.Konoplianikov: an explanation of HCAL calibration method ("30aug06.pdf")

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V.Konoplyanikov: an explanation of HCAL calibration method ("30aug06.pdf")

According to Viktor, the document is based on slides shown in a talk in Dubna given on 30aug06. Explained here is the calibration method used for 2007 calibration results shown by Victor at the Forward Calibration Meeting 22.10.10.

 
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V.Konoplianikov: an explanation of HCAL calibration method ("30aug06.pdf")

CMS NOTE 1999/038 E. Doroshkevich, V. Gavrilov, "Calibration of HF based on minimisation of missing Et"

http://cms-secr.web.cern.ch/cms-secr/documents/99/note99_038.pdf

 

"QCD Photon Status..." at QCD Meeting 26.01.10

The meeting: http://indico.cern.ch/conferenceDisplay.py?confId=76815

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pdf: http://arxiv.org/pdf/1005.4529v1
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EGM-10-006 Isolated Photon Reconstruction and Identification at sqrt{s}=7 TeV

The posting:

"
> Analysis to be presented for preapproval: EGM-10-006 Isolated Photon reconstruction and Identification at sqrt{s}=7 TeV

> Forum: Physics Announcements
> Date: Oct 22, 09:43
> From: Marco Pieri

Dear Colleagues,

The physics analysis `Isolated Photon Reconstruction and Identification at sqrt{s}=7 TeV` (CADI entry EGM-10-006) is seeking pre-approval by the EGM physics group.

The pre-approval presentation will take place on Thu, Oct 28, 2010, during the regular EGM Working meeting at 4 pm.

The corresponding documentation can be found on CADI at

For the analysis notes, due to technical reasons, it is not currently possible to link all of them from CADI, they are:

  • AN-10-268
  • AN-10-292
  • AN-10-295
  • AN-10-289

Please take them directly from iCMS page.

Best regards,
The EGM conveners: Paolo Meridiani, Marco Pieri
"

 
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pythia

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Tune Z1: R.D.Field's report to CMS 18.08.10: 1 , 2
 

JETPHOX

"JETPHOX is a program to calculate the reactions h h -> gamma/hadron + jet + X. By integrating over the jet, one can get the inclusive photon/hadron cross section at NLO."

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JETPHOX based papers

  • arXiv.org > hep-ph > arXiv:1005.4529
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pdf: http://arxiv.org/pdf/1005.4529v1
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JETPHOX

 
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"JETPHOX is a program to calculate the reactions h h -> gamma/hadron + jet + X. By integrating over the jet, one can get the inclusive photon/hadron cross section at NLO."
 
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Home page:

JETPHOX based papers

 
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γ+jet: first info

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γ+jet: introductory info

 
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Konoplyanikov: dissertation (in russian)

 
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Title: Использование канала "прямой фотон + струя" для установления абсолютной шкалы энергии струи на установке CMS

Original location: http://cmsdoc.cern.ch/~kon/old/dis09okt08/

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pythia

http://home.thep.lu.se/~torbjorn/Pythia.html

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CMS-NOTE-2006-042 "Jet Calibration using gamma+jet Events in the CMS Detector "

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"QCD Photon Status..." at QCD Meeting 26.01.10

The meeting: http://indico.cern.ch/conferenceDisplay.py?confId=76815
The report: http://indico.cern.ch/getFile.py/access?contribId=6&resId=0&materialId=slides&confId=76815
The reporter: Ted Ritchie Kolberg, ND (U.of Notre Dame)
The title: "QCD photons:status and plot proposal"

QCD Photons Meetings

see in the list of "QCD physics" meetings:
http://indico.cern.ch/categoryDisplay.py?categId=1313

 

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CMS-NOTE-2006-042 "Jet Calibration using gamma+jet Events in the CMS Detector "

http://cdsweb.cern.ch/record/934069/files/NOTE2006_042.pdf

 

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γ+jet: first info

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-- AlexanderFedotov - 26-Jan-2010 < center>

γ+jet: first info

Cross section

PTDRV2, p.572 (sec.E.5.4) Table E.6

To be compared to "di-jets":

To find:

 
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