Difference between revisions of "Dilepton"

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= Introduction =
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= Mailing List =
  
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= program =
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ee@jlab.org
  
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[[SoLID_JPsi]]
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register at https://mailman.jlab.org/mailman/listinfo/ee
  
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[[TCS]]
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= Meeting =
  
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[[DDVCS]]
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'''Date''' Thursday 9:00AM ET
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'''Location''' F228
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'''Conference ID''' 7572696671
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'''Desktop sharing and video''' https://bluejeans.com/7572696671
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(You don't need to call in by phone if your PC has a mic and a speaker,
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but do REMEMBER to turn off mic and speaker to avoid echo if you use phoneline for audio)
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'''Audio''' Dial: 18882402560 (US or Canada only) ([http://bluejeans.com/numbers see all numbers]) and enter the Conference ID
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'''meeting system "bluejeans" howto''' https://hallaweb.jlab.org/wiki/index.php/Bluejeans_howto
  
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= emaillist =
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=== [[ meetings ]] ===  
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ee@jlab.org
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<br>
  
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register at https://mailman.jlab.org/mailman/listinfo/ee
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= Physics Topics =
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[[ TCS | Timelike Compton Scattering (TCS) ]]
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[[ Jpsi | Near-Threshold J/Ψ production ]]
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[[ penta | Charmonium pentaquark ]]
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[[ DDVCS |  Double DVCS ]]
  
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= code =
 
  
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* generator by Marie Boer and Michel GUIDAL
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= Experiments and Letters of Intent =
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** input file [https://userweb.jlab.org/~zwzhao/TCS/sim/TCS.input]
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** root file https://ipnshare.in2p3.fr/owncloud/public.php?service=files&t=2224e3a32537708e35f2082e15a1be8f (700MB)
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** note from Marie
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<pre>
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It is a root file with 2000000 events. You have 4-vectors that correspond to the outgoing particle energies and momenta,
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kinematical variables: Phi_CMV and Theta_CMV are the gamma* CM angles, Qp2 is Q'^2,
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Egamma is energy of the beam and tt is t. ttmin is t_min.
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You can select "VirtualFlag==0" correspond to event generated from a photon beam
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and "VirtualFlag==1" from quasi-real photon, with a cut maximal Q2=0.3 GeV2.
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To weight events you should use "W_tot_unpol". I am not sure yet of the polarized weights in some of the bins,
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* E12-12-001 "Timelike Compton Scattering and J/ψ photoproduction on the proton in e+e- pair production with CLAS12 at 11 GeV"<br>
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so please let me check it before using it.  
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Proposal https://www.jlab.org/exp_prog/proposals/12/PR12-12-001.pdf was approved for 120 PAC days in CLAS12 by PAC 39.
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You can nevertheless also use "W_BH" and "W_TCS" that correspond to "BH only" or "TCS only" contribution to the unpolarized cross sections.
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Polarization vectors are probably not good in this version, please don't use it. The code is still in construction...  
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* [[ SoLID_JPsi | E12-12-006 "Near Threshold Electroproduction of J/Ψ at 11 GeV" ]]<br>
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Proposal https://www.jlab.org/exp_prog/proposals/12/PR12-12-006.pdf was approved for 60 PAC days in SoLID by PAC 39.
  
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I am doing some checks with the weights of the event generator. It seems there are some shifts when attributing  weights in the non physical part of the phase space. It comes when I generate the grid, I removed all "nan" in calculations but I introduced this problem. I will solve it today but it means I have to run a new table for cross sections. It is around 3 days.
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* E12-12-006A "TCS with circularly polarized beam and unpolarized LH2 target"
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</pre>
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Run group proposal https://www.jlab.org/exp_prog/proposals/15/PR12-12-006A.pdf approved by the SoLID collaboration.
  
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* genTCS
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* LOI12-15-007 "Timelike Compton Scattering on the transversely polarized proton at 11 GeV"
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** https://jlabsvn.jlab.org/svnroot/solid/evgen/genTCS
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LOI https://www.jlab.org/exp_prog/proposals/15/LOI12-15-007.pdf was submitted to PAC 43.
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** BH from quasi-real electron and real photon on proton, home made
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* grape-dilepton 
 
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** http://research.kek.jp/people/tabe/grape
 
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** BH from electron on proton, used by the experiments at DESY/HERA
 
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** see details how to run it and analysis result at https://jlabsvn.jlab.org/svnroot/solid/evgen/BH/readme
 
  
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* LPAIR
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= Software and Analysis tools =
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** used by the experiments at DESY/HERA
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* Compton2.0
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=== generators ===
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** BH from photoproduction, used by ZEUS
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* GiBUU
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List of [[ Dilepton_generator | Dilepton generators ]]
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** http://gibuu.hepforge.org
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(It may work on neutron also)
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GiBUU does a good job with real photons on a proton (or heavier)
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target.  It doesn't handle electroproduction as nicely (at least not the
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last time I asked the Giessen group).
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It is fairly straight forward to generate events, and there USED to be
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good examples of input jobcards on the website, but they have been removed
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recently while they upgrade.  I'd think the best route is to email them
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directly to get the code and also ask for the example jobcards.
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Latest revision as of 16:26, 2 March 2017

Mailing List

ee@jlab.org

register at https://mailman.jlab.org/mailman/listinfo/ee

Meeting

Date Thursday 9:00AM ET
Location F228
Conference ID 	7572696671
Desktop sharing and video https://bluejeans.com/7572696671
(You don't need to call in by phone if your PC has a mic and a speaker, 
but do REMEMBER to turn off mic and speaker to avoid echo if you use phoneline for audio)
Audio Dial: 18882402560 (US or Canada only) (see all numbers) and enter the Conference ID
meeting system "bluejeans" howto https://hallaweb.jlab.org/wiki/index.php/Bluejeans_howto

meetings


Physics Topics

Timelike Compton Scattering (TCS)

Near-Threshold J/Ψ production

Charmonium pentaquark

Double DVCS


Experiments and Letters of Intent

  • E12-12-001 "Timelike Compton Scattering and J/ψ photoproduction on the proton in e+e- pair production with CLAS12 at 11 GeV"

Proposal https://www.jlab.org/exp_prog/proposals/12/PR12-12-001.pdf was approved for 120 PAC days in CLAS12 by PAC 39.

Proposal https://www.jlab.org/exp_prog/proposals/12/PR12-12-006.pdf was approved for 60 PAC days in SoLID by PAC 39.

  • E12-12-006A "TCS with circularly polarized beam and unpolarized LH2 target"

Run group proposal https://www.jlab.org/exp_prog/proposals/15/PR12-12-006A.pdf approved by the SoLID collaboration.

  • LOI12-15-007 "Timelike Compton Scattering on the transversely polarized proton at 11 GeV"

LOI https://www.jlab.org/exp_prog/proposals/15/LOI12-15-007.pdf was submitted to PAC 43.


Software and Analysis tools

generators

List of Dilepton generators

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