Difference: AVFedotovLogA009 (1 vs. 10)

Revision 102010-09-11 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010
Line: 109 to 109
 /castor/cern.ch/user/f/fedotov/crab/ridge/QCDDiJet_Pt80to120.Summer10-START36_V9_S09-v1.GEN-SIM-RECO.SW363_genParticles/SW363.genParticles_6_1_ZkW.root /castor/cern.ch/user/f/fedotov/crab/ridge/QCDDiJet_Pt80to120.Summer10-START36_V9_S09-v1.GEN-SIM-RECO.SW363_genParticles/SW363.genParticles_7_1_1hp.root
Added:
>
>
The files contain the GenParticleCollection and GenEventInfoProduct products only selected in the CRAB task with
<!-- SyntaxHighlightingPlugin -->
process.out = cms.OutputModule("PoolOutputModule",
    fileName = cms.untracked.string( 'SW363.genParticles.root' ),
    outputCommands = cms.untracked.vstring("drop *",
                                           "keep GenEventInfoProduct_*_*_*",
                                           "keep *_genParticles_*_*"
                                           )
)
<!-- end SyntaxHighlightingPlugin -->

 The CRAB stage: done under CMSSW_3_6_3.
The final analysis: CMSSW_3_7_0. </>
<!--/twistyPlugin-->
Line: 255 to 267
 

Two particle correlations

Changed:
<
<
The analysis is done in a set of particle-pt bins for stable particles -- descendats of
>
>
The analysis is done in a set of particle-pt bins for stable particles - descendants of
 strings satisfying the selection B .
_Total (over strings) numbers
Line: 396 to 408
 
  • a "parallel" enhancement is observed at = 3.75-4 in the interval of pt 0 to 4 GeV. Its size grows from 3% at pt < .5 GeV to 23%
Changed:
<
<
at 1 < pt < 2 GeV, the further trend is unclear with the current
>
>
at 1 < pt < 2 GeV, the further trend is unclear with the used
  statistics.
  • the "parallel" enhancement is what was expected to be observed in a string fragmentation picture. However, its nature is not revealed in the

Revision 92010-09-10 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010

Revision 82010-09-10 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010
Line: 185 to 185
 

  • the initial strings are quite asymmetric in terms of pt of end partons:
Changed:
<
<

< pt(high) / pt(low) > = ~8 .
>
>

< pt(high) > / < pt(low) > = ~8 .
 
  • cuts A enlarge this asymmetry

The distribution of strings after the selection A

Revision 72010-09-10 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010
Line: 197 to 197
 
Added:
>
>
 

correlation between end partons of a string

Line: 268 to 272
 
>4 226752 976802
Changed:
<
<
Shown below for each bin are
>
>
Shown below for each bin (a subsection per bin) are
 
  1. a 2-d pair distribution in
  2. one or two zoomed versions of 1,
Changed:
<
<
  1. and a 1-d distribution in for 3.75 < < 4
>
>
  1. and a 1-d distribution in for 3.75 < < 4
 
Line: 287 to 291
  s1.CoP1P2_ptALL.LASTBIN.gif
Added:
>
>
  • There is a "ridge" at = 0 clearly extending to = 4 -- the effect we looked for. * the relative height of the bump at 3.75 < < 4 (0 degree / 110 degree - 1) is 5.8 %
  • There is another ridge/bump at = 180 which is completely unexpected in a string fragmentation picture if there is no back-to-back correlation between end partons , and we did not see such a correlation in the corresponding plot
 

Two particles : 0 < pt < 0.5 GeV

Line: 299 to 311
  s1.CoP1P2_pt0.LASTBIN.gif
Added:
>
>
  • The enhancement towards = 0 is available, though its size is smaller than that in the all-pt case:
    ((0 deg / 170 deg) - 1) = 3.0 % at =3.75 - 4
  • no back-to-back enhancement
 

Two particles : 0.5 < pt < 1 GeV

Line: 309 to 326
  s1.CoP1P2_pt0.5.LASTBIN.gif
Added:
>
>
  • the "parallel" enhancement gets larger:
    9.0% at = 3.75-4
  • the back-to-back one appears
 

Two particles : 1 < pt < 2 GeV

Line: 320 to 341
  s1.CoP1P2_pt1.LASTBIN.gif
Added:
>
>
  • the "parallel" enhancement grows further:
    23% at = 3.75-4
  • the back-to-back one does too
 

Two particles : 2 < pt < 3 GeV

Line: 332 to 358
  s1.CoP1P2_pt2.LASTBIN.gif
Added:
>
>
  • for the "parallel" enhancement, a decreased statistics does not allow to tell the trend; the size is
    10-30% at = 3.75-4
  • the back-to-back enhancement continues to grow (up to 50% ?)
 

Two particles : 3 < pt < 4 GeV

Line: 342 to 372
  s1.CoP1P2_pt3.LASTBIN.gif
Added:
>
>
  • the "parallel" enhancement: statistics is low,
    the size in the interval 0-30% ( = 3.75-4)
  • the back-to-back one: gets very high to about 200% ( = 3.75-4)
 

Two particles : pt > 4 GeV

Line: 353 to 387
  s1.CoP1P2_pt4.LASTBIN.gif
Changed:
<
<
>
>
  • the "parallel" enhancement: disappears completely (in the tail of the back-to-back one?)
  • the back-to-back enhancement: reached maximum size of ~700%

A summary for two particles correlations

  • a "parallel" enhancement is observed at = 3.75-4 in the interval of pt 0 to 4 GeV. Its size grows from 3% at pt < .5 GeV to 23% at 1 < pt < 2 GeV, the further trend is unclear with the current statistics.
  • the "parallel" enhancement is what was expected to be observed in a string fragmentation picture. However, its nature is not revealed in the current observation. E.g. the reason may be correlations between decay products of resonances and other unstable particles (even the photons from -decays may play a role; by the way, these photons may constitute up to 50% of the studied stable particle sample)
  • a huge back-to-back enhancement is observed, which was not expected at all in the naive string fragmentation picture.
 
Line: 369 to 420
  s1.CoP1Parton_ptALL.ZOOM.gif
Added:
>
>
  • "parallel" and "back-to-back" enhancements are present
 

particle-parton : 0 < pt < 0.5 GeV

Line: 379 to 431
  s1.CoP1Parton_pt0.Zoom.gif
Added:
>
>
  • "parallel" and "back-to-back" enhancements are present
 

particle-parton : 0.5 < pt < 1 GeV

Line: 388 to 442
  s1.CoP1Parton_pt0.5.Zoom.gif
Added:
>
>
  • "parallel" and "back-to-back" enhancements are present
 

particle-parton : 1 < pt < 2 GeV

Line: 400 to 456
 
Added:
>
>
  • "parallel" and "back-to-back" enhancements are present
 

particle-parton : 2 < pt < 3 GeV

Line: 410 to 468
  s1.CoP1Parton_pt2.Zoom.gif
Added:
>
>
  • the "back-to-back" enhancement remains only
 

particle-parton : 3 < pt < 4 GeV

Line: 420 to 479
  s1.CoP1Parton_pt3.Zoom.gif
Added:
>
>
  • the "back-to-back" enhancement is available only
 

particle-parton : pt > 4 GeV

Line: 430 to 490
  s1.CoP1Parton_pt4.Zoom2.gif
Added:
>
>
  • the "back-to-back" enhancement available only

A summary for particle-parton correlations

  • a "parallel" enhancement is observed at = 3.75-4 in the interval of pt 0 to 2 GeV.
  • a "parallel" enhancement is what was expected to be observed in a string fragmentation picture. Unlike to a similar enhancement in two-particle distribution, this one supports the naive string fragmentation picture, because this case ia a direct study of correlation between the particle and string variables.
  • a back-to-back enhancement is also observed. Why does pythia produce it? A correlated appearence of gluons within a parton shower? The fragmentation of a string proceeding not independently of the fragmentation of other strings in an event?
 
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META FILEATTACHMENT attachment="s1.h2_ptHi_ptLo.COLZ.gif" attr="" comment="" date="1284024595" name="s1.h2_ptHi_ptLo.COLZ.gif" path="s1.h2_ptHi_ptLo.COLZ.gif" size="22462" stream="s1.h2_ptHi_ptLo.COLZ.gif" tmpFilename="/usr/tmp/CGItemp42061" user="fedotov" version="1"
META FILEATTACHMENT attachment="s1.h_ptHi.log.gif" attr="" comment="" date="1284024690" name="s1.h_ptHi.log.gif" path="s1.h_ptHi.log.gif" size="13201" stream="s1.h_ptHi.log.gif" tmpFilename="/usr/tmp/CGItemp41968" user="fedotov" version="1"

Revision 62010-09-10 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010
Line: 195 to 196
  s1.A.h_dEtaHiLow.gif
Deleted:
<
<
  • s1.B.h_dPhiHiLow.gif:
    s1.B.h_dPhiHiLow.gif
 
Changed:
<
<
  • s1.A.h_nStable.gif:
    s1.A.h_nStable.gif
>
>

correlation between end partons of a string

s1.B.h_dPhiHiLow.gif

  • no significant deviation from a flat behaviour is seen

Multiplicities of stable particles

Multiplicities of stable particles in strings

The distribution of strings in the number of stable particles which are the string descendants, for selections A,B :

s1.A.h_nStable.gif s1.B.h_nStable.gif

Fraction of stable string descendants in the total number of stable particles in event

The distribution of strings for selections A,B :

s1.h_StrStableFrac_A.gif s1.h_StrStableFrac_B.gif

Event distribution in total number of stable particles

The events distributions are shown below for the three event samples:

  1. all input events,
  2. events with strings satisfying the selection A ,
  3. events with strings satisfying the selection B .

s1.h_nStableEv.gif

s1.h_nStableEv_A.gif s1.h_nStableEv_B.gif

Two particle correlations

The analysis is done in a set of particle-pt bins for stable particles -- descendats of strings satisfying the selection B .

Total (over strings) numbers
of particles and particle pairs
in pt bins:
pt bin (GeV) particles pairs
all 3583929 255279573
0 - 0.5 2002457 79971668
.5 - 1 697580 10079592
1 - 2 440778 4335538
2 - 3 146175 479095
3 - 4 70187 110297
>4 226752 976802

Shown below for each bin are

  1. a 2-d pair distribution in
  2. one or two zoomed versions of 1,
  3. and a 1-d distribution in for 3.75 < < 4

Two particles : all pt

s1.CoP1P2_ptALL.gif s1.CoP1P2_ptALL.ZOOM.gif s1.CoP1P2_ptALL.ZOOM2.gif s1.CoP1P2_ptALL.LASTBIN.gif
 
Changed:
<
<
  • s1.B.h_nStable.gif:
    s1.B.h_nStable.gif
>
>

Two particles : 0 < pt < 0.5 GeV

 
Deleted:
<
<
  • s1.h_StrStableFrac_A.gif:
    s1.h_StrStableFrac_A.gif
 
Deleted:
<
<
  • s1.h_StrStableFrac_B.gif:
    s1.h_StrStableFrac_B.gif
 
Changed:
<
<
  • s1.h_nStableEv.gif:
    s1.h_nStableEv.gif
>
>
s1.CoP1P2_pt0.gif s1.CoP1P2_pt0.Zoom.gif s1.CoP1P2_pt0.LASTBIN.gif
 
Deleted:
<
<
  • s1.h_nStableEv_A.gif:
    s1.h_nStableEv_A.gif
 
Changed:
<
<
  • s1.h_nStableEv_B.gif:
    s1.h_nStableEv_B.gif
>
>

Two particles : 0.5 < pt < 1 GeV

 
Deleted:
<
<
  • s1.CoP1P2_ptALL.gif:
    s1.CoP1P2_ptALL.gif
 
Changed:
<
<
  • s1.CoP1P2_ptALL.ZOOM.gif:
    s1.CoP1P2_ptALL.ZOOM.gif
>
>
s1.CoP1P2_pt0.5.gif s1.CoP1P2_pt0.5.Zoom.gif s1.CoP1P2_pt0.5.LASTBIN.gif
 
Deleted:
<
<
  • s1.CoP1P2_ptALL.ZOOM2.gif:
    s1.CoP1P2_ptALL.ZOOM2.gif
 
Changed:
<
<
  • s1.CoP1P2_ptALL.LASTBIN.gif:
    s1.CoP1P2_ptALL.LASTBIN.gif
>
>

Two particles : 1 < pt < 2 GeV

 
Deleted:
<
<
  • s1.CoP1P2_pt0.gif:
    s1.CoP1P2_pt0.gif
 
Changed:
<
<
  • s1.CoP1P2_pt0.Zoom.gif:
    s1.CoP1P2_pt0.Zoom.gif
>
>
s1.CoP1P2_pt1.gif s1.CoP1P2_pt1.Zoom.gif s1.CoP1P2_pt1.Zoom2.gif s1.CoP1P2_pt1.LASTBIN.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt0.LASTBIN.gif:
    s1.CoP1P2_pt0.LASTBIN.gif
 
Changed:
<
<
  • s1.CoP1P2_pt0.5.gif:
    s1.CoP1P2_pt0.5.gif
>
>

Two particles : 2 < pt < 3 GeV

 
Deleted:
<
<
  • s1.CoP1P2_pt0.5.Zoom.gif:
    s1.CoP1P2_pt0.5.Zoom.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt0.5.LASTBIN.gif:
    s1.CoP1P2_pt0.5.LASTBIN.gif
 
Changed:
<
<
  • s1.CoP1P2_pt1.gif:
    s1.CoP1P2_pt1.gif
>
>
s1.CoP1P2_pt2.gif s1.CoP1P2_pt2.Zoom.gif s1.CoP1P2_pt2.Zoom2.gif s1.CoP1P2_pt2.LASTBIN.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt1.Zoom.gif:
    s1.CoP1P2_pt1.Zoom.gif
 
Changed:
<
<
  • s1.CoP1P2_pt1.Zoom2.gif:
    s1.CoP1P2_pt1.Zoom2.gif
>
>

Two particles : 3 < pt < 4 GeV

 
Deleted:
<
<
  • s1.CoP1P2_pt1.LASTBIN.gif:
    s1.CoP1P2_pt1.LASTBIN.gif
 
Changed:
<
<
  • s1.CoP1P2_pt2.gif:
    s1.CoP1P2_pt2.gif
>
>
s1.CoP1P2_pt3.gif s1.CoP1P2_pt3.Zoom.gif s1.CoP1P2_pt3.LASTBIN.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt2.Zoom.gif:
    s1.CoP1P2_pt2.Zoom.gif
 
Changed:
<
<
  • s1.CoP1P2_pt2.Zoom2.gif:
    s1.CoP1P2_pt2.Zoom2.gif
>
>

Two particles : pt > 4 GeV

 
Deleted:
<
<
  • s1.CoP1P2_pt2.LASTBIN.gif:
    s1.CoP1P2_pt2.LASTBIN.gif
 
Changed:
<
<
  • s1.CoP1P2_pt3.gif:
    s1.CoP1P2_pt3.gif
>
>
s1.CoP1P2_pt4.gif s1.CoP1P2_pt4.Zoom.gif s1.CoP1P2_pt4.Zoom2.gif s1.CoP1P2_pt4.LASTBIN.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt3.Zoom.gif:
    s1.CoP1P2_pt3.Zoom.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt3.LASTBIN.gif:
    s1.CoP1P2_pt3.LASTBIN.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt4.gif:
    s1.CoP1P2_pt4.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt4.Zoom.gif:
    s1.CoP1P2_pt4.Zoom.gif
 
Deleted:
<
<
  • s1.CoP1P2_pt4.Zoom2.gif:
    s1.CoP1P2_pt4.Zoom2.gif
 
Changed:
<
<
  • s1.CoP1P2_pt4.LASTBIN.gif:
    s1.CoP1P2_pt4.LASTBIN.gif
>
>

Particle - high-pt-parton correlations

 
Deleted:
<
<
  • s1.CoP1Parton_ptALL.gif:
    s1.CoP1Parton_ptALL.gif
 
Changed:
<
<
  • s1.CoP1Parton_ptALL.ZOOM.gif:
    s1.CoP1Parton_ptALL.ZOOM.gif
>
>

particle-parton : all pt

 
Deleted:
<
<
  • s1.CoP1Parton_pt0.gif:
    s1.CoP1Parton_pt0.gif
 
Changed:
<
<
  • s1.CoP1Parton_pt0.Zoom.gif:
    s1.CoP1Parton_pt0.Zoom.gif
>
>
s1.CoP1Parton_ptALL.gif s1.CoP1Parton_ptALL.ZOOM.gif
 
Deleted:
<
<
  • s1.CoP1Parton_pt0.5.gif:
    s1.CoP1Parton_pt0.5.gif
 
Deleted:
<
<
  • s1.CoP1Parton_pt0.5.Zoom.gif:
    s1.CoP1Parton_pt0.5.Zoom.gif
 
Changed:
<
<
  • s1.CoP1Parton_pt1.gif:
    s1.CoP1Parton_pt1.gif
>
>

particle-parton : 0 < pt < 0.5 GeV

 
Deleted:
<
<
  • s1.CoP1Parton_pt1.Zoom.gif:
    s1.CoP1Parton_pt1.Zoom.gif
 
Changed:
<
<
  • s1.CoP1Parton_pt1.Zoom2.gif:
    s1.CoP1Parton_pt1.Zoom2.gif
>
>
s1.CoP1Parton_pt0.gif s1.CoP1Parton_pt0.Zoom.gif
 
Deleted:
<
<
  • s1.CoP1Parton_pt2.gif:
    s1.CoP1Parton_pt2.gif
 
Changed:
<
<
  • s1.CoP1Parton_pt2.Zoom.gif:
    s1.CoP1Parton_pt2.Zoom.gif
>
>

particle-parton : 0.5 < pt < 1 GeV

 
Deleted:
<
<
  • s1.CoP1Parton_pt3.gif:
    s1.CoP1Parton_pt3.gif
 
Changed:
<
<
  • s1.CoP1Parton_pt3.Zoom.gif:
    s1.CoP1Parton_pt3.Zoom.gif
>
>
s1.CoP1Parton_pt0.5.gif s1.CoP1Parton_pt0.5.Zoom.gif
 
Deleted:
<
<
  • s1.CoP1Parton_pt4.gif:
    s1.CoP1Parton_pt4.gif
 
Deleted:
<
<
  • s1.CoP1Parton_pt4.Zoom.gif:
    s1.CoP1Parton_pt4.Zoom.gif
 
Changed:
<
<
  • s1.CoP1Parton_pt4.Zoom2.gif:
    s1.CoP1Parton_pt4.Zoom2.gif
>
>

particle-parton : 1 < pt < 2 GeV

 
Added:
>
>
s1.CoP1Parton_pt1.gif s1.CoP1Parton_pt1.Zoom.gif s1.CoP1Parton_pt1.Zoom2.gif

particle-parton : 2 < pt < 3 GeV

s1.CoP1Parton_pt2.gif s1.CoP1Parton_pt2.Zoom.gif

particle-parton : 3 < pt < 4 GeV

s1.CoP1Parton_pt3.gif s1.CoP1Parton_pt3.Zoom.gif

particle-parton : pt > 4 GeV

s1.CoP1Parton_pt4.gif s1.CoP1Parton_pt4.Zoom.gif s1.CoP1Parton_pt4.Zoom2.gif
 
META FILEATTACHMENT attachment="s1.h2_ptHi_ptLo.scatter.gif" attr="" comment="" date="1284024444" name="s1.h2_ptHi_ptLo.scatter.gif" path="s1.h2_ptHi_ptLo.scatter.gif" size="18251" stream="s1.h2_ptHi_ptLo.scatter.gif" tmpFilename="/usr/tmp/CGItemp41987" user="fedotov" version="1"
META FILEATTACHMENT attachment="s1.h2_ptHi_ptLo.COLZ.gif" attr="" comment="" date="1284024595" name="s1.h2_ptHi_ptLo.COLZ.gif" path="s1.h2_ptHi_ptLo.COLZ.gif" size="22462" stream="s1.h2_ptHi_ptLo.COLZ.gif" tmpFilename="/usr/tmp/CGItemp42061" user="fedotov" version="1"
META FILEATTACHMENT attachment="s1.h_ptHi.log.gif" attr="" comment="" date="1284024690" name="s1.h_ptHi.log.gif" path="s1.h_ptHi.log.gif" size="13201" stream="s1.h_ptHi.log.gif" tmpFilename="/usr/tmp/CGItemp41968" user="fedotov" version="1"

Revision 52010-09-10 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010
Line: 30 to 30
 To test these naive expectations with Pythia6 dijet events on generator level.
Added:
>
>
 

Method

In a loop over events and strings, a suitable string is selected, then

Line: 126 to 128
  the high- and low-pt-end partons |
Added:
>
>
The motivation for cuts A is a desire to have
  • a "hard" string, and
  • an asymmetry in pt between the end partons.
The motivation for the (two partons) > 8 is that
  • for particle-parton correlations (see Method) for particles with (particle-parton) < 4 to be studied, the cut selects the particles which are closer to the high-pt parton,
  • while for the two-particle correlation it provides a phase space (may be excessively) for two particles to reach (two particles) = 4 .

Some statistics:

     class    No. of   class
        ID   entries   comment

         1    183759  input evs
        10    183759  genParticles handle got
        20    654990  a string found
        30    654990  nMothers >= 2
        40    654990  all particles between the string ends are gluons
        50    100501  pt(highPtEnd) >        50
        60     75347     && pt(lowPtEnd) <         5
        70     75347  selected strings A (cuts on pt's of high-/low-pt ends) 
       100     75347  strings A with single-mother descendants
       200     29985  selected strings B (= A && eta-long strings)
       220     29985  strings B with single-mother descendants
       500    183759  evs with strings
       510     67327  evs with SELECTED strings A
       520     29150  evs with SELECTED strings B

  • the initial inclusive string multiplicity = 3.6
  • 41% and 16% of strings survive the cuts A and B respectively
  • the multiplicity of the selected strings is 0.58 (or 1.03 for events where they are present)

 The pt distributions of end partons for all the stings before selections :

Line: 134 to 176
 
Fig: Inclusive strings before selections
Changed:
<
<
and their correlation plot:
>
>
and their correlation:
 
s1.h2_ptHi_ptLo.scatter.gif s1.h2_ptHi_ptLo.COLZ.gif
Added:
>
>

Fig: Inclusive strings before selections
 
Changed:
<
<
  • s1.A.h_dEtaHiLow.gif:
    s1.A.h_dEtaHiLow.gif
>
>
  • the initial strings are quite asymmetric in terms of pt of end partons:
    < pt(high) / pt(low) > = ~8 .
  • cuts A enlarge this asymmetry

The distribution of strings after the selection A in the distance between the high- and low-pt-end partons where the region > 8 is selected finally:

s1.A.h_dEtaHiLow.gif
 
  • s1.B.h_dPhiHiLow.gif:
    s1.B.h_dPhiHiLow.gif

Revision 42010-09-10 - AlexanderFedotov

Line: 1 to 1
 
META TOPICPARENT name="AVFedotovLogA"
-- AlexanderFedotov - 09-Sep-2010
Line: 27 to 27
 

Aim of the exercise

Changed:
<
<
To check these naive expectations with Pythia6 dijet events
>
>
To test these naive expectations with Pythia6 dijet events
 on generator level.

Method

Line: 114 to 114
 

Selection of strings

Added:
>
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The strings are selected with three cutoffs applied to the parameters of end partons:
 
Changed:
<
<
Selection
label
Selection
A pt(high-pt-end parton) > 50 GeV
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pt(low-pt-end parton) < 5 GeV
| B
(final) | __A __    &&
> 8
>
>
selection
label
cut # cut
  1 pt(high-pt-end parton) > 50 GeV
A = 1*2 2 pt(low-pt-end parton) < 5 GeV
| B = 1*2*3 | 3 | > 8
 
for the distance between the high- and low-pt-end partons |
Added:
>
>
The pt distributions of end partons for all the stings before selections :
 
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s1.h_ptHi.log.gif s1.h_ptLo.log.gif
Fig: Inclusive strings before selections
 
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and their correlation plot:
 
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Revision 32010-09-09 - AlexanderFedotov

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The final analysis: CMSSW_3_7_0. </>
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Selection of strings

Selection
label
Selection
A pt(high-pt-end parton) > 50 GeV
&&
pt(low-pt-end parton) < 5 GeV
B
(final)
__A __    &&
> 8
for the distance between the high- and low-pt-end partons

 
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Revision 22010-09-09 - AlexanderFedotov

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 -- AlexanderFedotov - 09-Sep-2010

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Introduction

Considering the process of QCD high-pt jet production in a string fragmentation model a la pythia, the jet is a fragmentation product of a string stretched between

  • a hard (high-pt) final state parton (or its close descendant in a parton shower), and
  • another parton, which has typically a much lower pt.
The high-pt jet is formed near (in terms of ) the high-pt end of the string, while the other end may give rise to a much-lower-pt jet. If the distance between the end partons of the string is large enough, one can suppose, that
  • there may be a trail of relatively hight-pt particles extending from the high-pt end of the string towards (along ) the low-pt end
  • it would not be surprising if particles in the trail/tail would "remember" also the value of the high-pt end parton.

Aim of the exercise

To check these naive expectations with Pythia6 dijet events on generator level.

Method

In a loop over events and strings, a suitable string is selected, then considered are stable particles (status=1, including undecayed particles with "lifetime" > 1cm), descending from the string. For those particle, made are

  1. a two-particle correlation plot in the plane where 's are the corresponding differences between the two particles
    (a 2-d histo is filled with particle pairs from a selected string in a double loop over strings and events) ,
  2. a similar particle - high-pt-end parton correlation plot .

If the above expectations are correct, an enhancement near in the distribution at a constant might be observed which would be a possible manifestation of the expected correlation (particles "remembering" the value of the high-pt end parton).
While a flat distribution would mean an absence of correlations.

Actually, a correlation in the first plot would not prove the physics picture in question, for there is no association of a particle pair with the high-pt end parton in such a plot. The second plot provides, in principle, a much more direct test.

For simplicity, the range is limited by a high-enough max value of 4 .

Event sample

The Pythia6 dijet dataset
/QCDDiJet_Pt80to120/Summer10-START36_V9_S09-v1/GEN-SIM-RECO
was used:

process.configurationMetadata = cms.untracked.PSet(
    version = cms.untracked.string('$Revision: 1.2 $'),
    annotation = cms.untracked.string('Summer09: Pythia6 generation of QCD events, 7TeV, D6T tune, pthat = 80 .. 120 GeV'),
    name = cms.untracked.string('$Source: /cvs_server/repositories/CMSSW/CMSSW/Configuration/GenProduction/python/PYTHIA6_QCDpt_80_120_7TeV_cff.py,v $')
)
        
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Statistics: 184k evs corresponding to luminosity = 0.0289 pb-1 were truncated to a GenParticleCollection format and then analysed. More... Close

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The original dataset contains 607k evs, the reduction is due to a CRAB failure to deliver the output files to CASTOR in 7 jobs out of 11. The 4 successful files are
/castor/cern.ch/user/f/fedotov/crab/ridge/QCDDiJet_Pt80to120.Summer10-START36_V9_S09-v1.GEN-SIM-RECO.SW363_genParticles/SW363.genParticles_1_1_YjX.root
/castor/cern.ch/user/f/fedotov/crab/ridge/QCDDiJet_Pt80to120.Summer10-START36_V9_S09-v1.GEN-SIM-RECO.SW363_genParticles/SW363.genParticles_2_1_N9o.root
/castor/cern.ch/user/f/fedotov/crab/ridge/QCDDiJet_Pt80to120.Summer10-START36_V9_S09-v1.GEN-SIM-RECO.SW363_genParticles/SW363.genParticles_6_1_ZkW.root
/castor/cern.ch/user/f/fedotov/crab/ridge/QCDDiJet_Pt80to120.Summer10-START36_V9_S09-v1.GEN-SIM-RECO.SW363_genParticles/SW363.genParticles_7_1_1hp.root
The CRAB stage: done under CMSSW_3_6_3.
The final analysis: CMSSW_3_7_0.
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