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  • k-factor calculated by simulating pairs with homogoneous distributions of mass, transverse momentum and rapidity, and then filtering them by single-leg acceptance matrices

6 sectors active 6 sectors active 5 sectors active 4 sectors active
the missing ones next
to each other
4 sectors active
the missing ones
separatedby one good
4 sectors active
the missing ones are
opposite
kfac_white_mass.gif kfac_white_massoa.gif kfac_white_massoa_5sec.gif kfac_white_massoa_4sec_d0.gif kfac_white_massoa_4sec_d1.gif kfac_white_massoa_4sec_d2.gif
Comment:Now I change my mind slightly, the effect is visible also here and the reason, why it's so small might be different population of phase space in data and in this Pluto simulation
  • Invariant mass signal with and without Piotr factor (for the record: spectra are corrected for single-leg efficiency /emb. to UrQMD/, the same k-factor is used in both cases, no sector factor was applied, PID was done with MLP weights No. 6)

sig_corr_weight6_nofactorsVsPiotrFactor.gif

Comment:When the cut on opening angle > 9 deg is applied, only small part of the Piotr factor plays a role and only in very small masses, it has no influence above π0
  • Combinatorial background from simulation (no corrections or fetch factors, Geant PID and reconstuction / identification cuts):
    bgr_sim.png missid_sim.png

Comment: There is a small difference between true unlike-sign CB and geometrical average of like-sing CB (also taken from true leptons). The contribution of misidentified electron-proton pairs is negligible, the contribution of electron-pion pairs of all signs amounts to 1% of the true background, but when separeted to different signs it cancels out to big extent.
  • Signal from UrQMD, left: true cocktail, right: true signal and after subtracktion like-sign background.:
    • sig_urqmd.png sig_true_likesign.png

Comment: When like-sign combinatorial background is subtracted, the signal differs much from the true one - the "bump" appears. It is not improved much by applying the k-factor correction
  • k-factor from mixing EXP and UrQMD, with and without the efficiency correction. Background in SIM with and without k-factor.:
    kfac_kine_mass_cmp.gif kfac_richQa10_MLP06_rawcorr_expsim.gif bgr_sim_knok.gif

Comment: There is no big difference between k-factor obrained from event mixing in UrQMD and in real data. The trend by applying single-leg efficiency correction while calculating k-factor is also the same in SIM and in EXP.

kfac_richQa10_MLP06_raw_exp_centrdep.gifkfac_richQa10_MLP06_raw_sim_centrdep.gifkfac_kine_mass_centrdep.gif

Comment There is no centraluty dependence in the level of HGeantKine filtered through one-leg efficiency. On the level of tracks reconstructed in EXP or in SIM, centrality dependence is quite similar, although SIM suffers from statistics. On the HGeantKine level filtering both legs by efficiency assumes, that efficiencies to reconstruct both leptons are indpendent. The difference to k-factor from reconstructed tracks in EXP or SIM shows, that this is not the case and there are correlations, that can depend on the multiplicity.

kfac_ratios_mult0.gifkfac_ratios_mult1.gifkfac_ratios_mult2.gifkfac_ratios_mult3.gifkfac_ratios_mult4.gif

multbin1 - most central, multbin4 - most peripheral

Comment Here the difference can be seen in detail. Discrepancy betwen reco in EXP and in SIM (besides just statistics problem is SIM) may come from the fact, that not all efficiency effects (and so correlations) are reproduces in digitizers.

RAW withhout k-factor:

mass_centrdep_nok.gifintegral_centrdep_npcbsig_pi0_raw_nok.gifintegral_centrdep_npcbsig_midm_raw_nok.gif

RAW with k-factor

mass_centrdep_raw.gifintegral_centrdep_npcbsig_pi0_raw_withk.gifintegral_centrdep_npcbsig_midm_raw_withk.gif

Comment: There is no huge difference in trend whether you use k-factor or not. Even if k-factor would be wrong by 10%, you will not recover centrality dependence if you reduce this uncertainty.

CORR withhout k-factor:

mass_centrdep_nok.gifintegral_centrdep_npcbsig_pi0_corr_nok.gifintegral_centrdep_npcbsig_midm_corr_nok.gif

Comment: The yield below 100 MeV is more or less constant, when normalized to the number of π0. In the higher masses there is a slight trend, but within errors it is consistent with constant. When looking at all +-combinations there is a clear increase with more central events, bu it's the same in the like-sign background and therefore it's mainly canceled out in the signal.The "all PT3" bin is also slightly out of the trend.

CORR with k-factor

mass_centrdep.gifintegral_centrdep_npcbsig_pi0_corr_withk.gifintegral_centrdep_npcbsig_midm_corr_withk.gif

Comment: With k-factor applied, the dependence at higher masses is even reduced.

Just for fun: scale the background by 0.8 before subtracting (this is CORR without k-factor)

integral_centrdep_npcbsig_pi0_corr_nok_bgr08test.gifintegral_centrdep_npcbsig_midm_corr_nok_bgr08test.gif

mass-pt:

+- mixing ++ mixing -- mixing geom. avg. mixing k-factor k-factor Kine mixing
masspt_npmix.gif masspt_ppmix.gif masspt_nnmix.gif masspt_avgmix.gif masspt_kfac.gif kfac_kine_masspt.gif
+- data ++ data -- data geom. avg. data signal data  
masspt_npdata.gif masspt_ppdata.gif masspt_nndata.gif masspt_avgdata.gif masspt_sigdata.gif  
Comment: Note the trouble when calculating geometric mean in m-pt representation, for low mass and low pt. Going towards higher values of both observables first only -- pairs are present and only they are taken as the background. Then there are borth ++ and --, but there are only few ++and this reduces the geometric average. Then there is sufficient amount of both signs and the average has a reasonable value. As a consequence the average is artificially jumping up and down and this is reflected also by the k-factor.

mass-opening angle

+- mixing ++ mixing -- mixing geom. avg. mixing k-factor k-factor Kine mixing
oamass_npmix.gif oamass_ppmix.gif oamass_nnmix.gif oamass_avgmix.gif oamass_kfac.gif kfac_kine_massoa.gif
+- data ++ data -- data geom. avg. data signal data  
oamass_npdata_deg.gif oamass_ppdata_9deg.gif oamass_nndata_9deg.gif oamass_avgdata_9deg.gif oamass_sigdata_9deg.gif  

pt-opening angle

+- mixing ++ mixing -- mixing geom. avg. mixing k-factor k-factor Kine mixing
oapt_npmix.gif oapt_ppmix.gif oapt_nnmix.gif oapt_avgmix.gif oapt_kfac.gif kfac_kine_oapt.gif
+- data ++ data -- data geom. avg. data signal data  
oapt_npdata.gif oapt_ppdata.gif oapt_nndata.gif oapt_avgdata.gif oapt_sigdata.gif  
Comment: The problem with 0 acceptance for ++pairs is also visible in this representation

Is pair production Poissonian?

Number of all electrons and positrons. produced in decays

-- SzymonHarabasz - 03 Feb 2016
Topic attachments
I Attachment Action Size Date Who Comment
bgr_sim.pngpng bgr_sim.png manage 37.3 K 03 Feb 2016 - 15:17 SzymonHarabasz  
bgr_sim_knok.gifgif bgr_sim_knok.gif manage 16.0 K 03 Feb 2016 - 17:52 SzymonHarabasz  
integral_centrdep_bgrmidm_raw.gifgif integral_centrdep_bgrmidm_raw.gif manage 9.8 K 10 Feb 2016 - 17:28 SzymonHarabasz  
integral_centrdep_bgrmidm_raw_nok.gifgif integral_centrdep_bgrmidm_raw_nok.gif manage 9.8 K 10 Feb 2016 - 17:28 SzymonHarabasz  
integral_centrdep_midm.gifgif integral_centrdep_midm.gif manage 10.0 K 05 Feb 2016 - 12:36 SzymonHarabasz  
integral_centrdep_midm_nok.gifgif integral_centrdep_midm_nok.gif manage 9.4 K 05 Feb 2016 - 12:36 SzymonHarabasz  
integral_centrdep_midm_nok_raw.gifgif integral_centrdep_midm_nok_raw.gif manage 10.9 K 10 Feb 2016 - 17:27 SzymonHarabasz  
integral_centrdep_midm_raw.gifgif integral_centrdep_midm_raw.gif manage 10.9 K 10 Feb 2016 - 17:27 SzymonHarabasz  
integral_centrdep_npcbsig_midm_corr_nok.gifgif integral_centrdep_npcbsig_midm_corr_nok.gif manage 12.5 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_midm_corr_nok_bgr08test.gifgif integral_centrdep_npcbsig_midm_corr_nok_bgr08test.gif manage 12.5 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_midm_corr_withk.gifgif integral_centrdep_npcbsig_midm_corr_withk.gif manage 12.4 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_midm_raw_nok.gifgif integral_centrdep_npcbsig_midm_raw_nok.gif manage 12.0 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_midm_raw_withk.gifgif integral_centrdep_npcbsig_midm_raw_withk.gif manage 12.0 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_pi0_corr_nok.gifgif integral_centrdep_npcbsig_pi0_corr_nok.gif manage 13.2 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_pi0_corr_nok_bgr08test.gifgif integral_centrdep_npcbsig_pi0_corr_nok_bgr08test.gif manage 13.2 K 29 Feb 2016 - 09:51 SzymonHarabasz  
integral_centrdep_npcbsig_pi0_corr_withk.gifgif integral_centrdep_npcbsig_pi0_corr_withk.gif manage 13.1 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_pi0_raw_nok.gifgif integral_centrdep_npcbsig_pi0_raw_nok.gif manage 11.9 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npcbsig_pi0_raw_withk.gifgif integral_centrdep_npcbsig_pi0_raw_withk.gif manage 12.0 K 29 Feb 2016 - 09:52 SzymonHarabasz  
integral_centrdep_npmidm_raw.gifgif integral_centrdep_npmidm_raw.gif manage 9.8 K 10 Feb 2016 - 17:28 SzymonHarabasz  
integral_centrdep_pi0.gifgif integral_centrdep_pi0.gif manage 9.4 K 05 Feb 2016 - 12:36 SzymonHarabasz  
integral_centrdep_pi0_nok.gifgif integral_centrdep_pi0_nok.gif manage 9.4 K 05 Feb 2016 - 12:36 SzymonHarabasz  
integral_centrdep_pi0_nok_raw.gifgif integral_centrdep_pi0_nok_raw.gif manage 9.5 K 10 Feb 2016 - 17:28 SzymonHarabasz  
integral_centrdep_pi0_raw.gifgif integral_centrdep_pi0_raw.gif manage 9.4 K 10 Feb 2016 - 17:28 SzymonHarabasz  
kfac_kine_mass.gifgif kfac_kine_mass.gif manage 13.2 K 08 Feb 2016 - 12:19 SzymonHarabasz  
kfac_kine_mass_centrdep.gifgif kfac_kine_mass_centrdep.gif manage 11.8 K 10 Feb 2016 - 17:24 SzymonHarabasz  
kfac_kine_mass_cmp.gifgif kfac_kine_mass_cmp.gif manage 13.2 K 08 Feb 2016 - 12:20 SzymonHarabasz  
kfac_kine_massoa.gifgif kfac_kine_massoa.gif manage 31.5 K 07 Feb 2016 - 19:06 SzymonHarabasz  
kfac_kine_masspt.gifgif kfac_kine_masspt.gif manage 23.3 K 07 Feb 2016 - 19:06 SzymonHarabasz  
kfac_kine_oapt.gifgif kfac_kine_oapt.gif manage 39.8 K 07 Feb 2016 - 19:06 SzymonHarabasz  
kfac_ratios_mult0.gifgif kfac_ratios_mult0.gif manage 13.6 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_ratios_mult1.gifgif kfac_ratios_mult1.gif manage 15.3 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_ratios_mult2.gifgif kfac_ratios_mult2.gif manage 14.6 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_ratios_mult3.gifgif kfac_ratios_mult3.gif manage 15.8 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_ratios_mult4.gifgif kfac_ratios_mult4.gif manage 16.9 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_richQa10_MLP06_raw_exp_centrdep.gifgif kfac_richQa10_MLP06_raw_exp_centrdep.gif manage 17.2 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_richQa10_MLP06_raw_sim_centrdep.gifgif kfac_richQa10_MLP06_raw_sim_centrdep.gif manage 18.9 K 10 Feb 2016 - 17:23 SzymonHarabasz  
kfac_richQa10_MLP06_rawcorr_expsim.gifgif kfac_richQa10_MLP06_rawcorr_expsim.gif manage 29.1 K 03 Feb 2016 - 17:51 SzymonHarabasz k-factor from mixing EXP and UrQMD, with and without the efficiency correction. Background in SIM with and without k-factor.
kfac_white_mass.gifgif kfac_white_mass.gif manage 14.8 K 03 Feb 2016 - 15:17 SzymonHarabasz  
kfac_white_massoa.gifgif kfac_white_massoa.gif manage 25.7 K 03 Feb 2016 - 15:18 SzymonHarabasz  
kfac_white_massoa_4sec_d0.gifgif kfac_white_massoa_4sec_d0.gif manage 24.6 K 05 Feb 2016 - 12:25 SzymonHarabasz  
kfac_white_massoa_4sec_d1.gifgif kfac_white_massoa_4sec_d1.gif manage 24.5 K 05 Feb 2016 - 12:25 SzymonHarabasz  
kfac_white_massoa_4sec_d2.gifgif kfac_white_massoa_4sec_d2.gif manage 20.4 K 05 Feb 2016 - 12:25 SzymonHarabasz  
kfac_white_massoa_5sec.gifgif kfac_white_massoa_5sec.gif manage 24.1 K 05 Feb 2016 - 12:25 SzymonHarabasz  
mass_centrdep.gifgif mass_centrdep.gif manage 41.4 K 05 Feb 2016 - 12:35 SzymonHarabasz  
mass_centrdep_nok.gifgif mass_centrdep_nok.gif manage 40.4 K 05 Feb 2016 - 12:35 SzymonHarabasz  
mass_centrdep_raw.gifgif mass_centrdep_raw.gif manage 40.7 K 10 Feb 2016 - 17:34 SzymonHarabasz  
mass_centrdep_raw_nok.gifgif mass_centrdep_raw_nok.gif manage 39.8 K 10 Feb 2016 - 17:34 SzymonHarabasz  
masspt_avgdata.gifgif masspt_avgdata.gif manage 17.4 K 05 Feb 2016 - 13:30 SzymonHarabasz  
masspt_avgmix.gifgif masspt_avgmix.gif manage 16.4 K 05 Feb 2016 - 13:16 SzymonHarabasz  
masspt_kfac.gifgif masspt_kfac.gif manage 20.8 K 05 Feb 2016 - 13:16 SzymonHarabasz  
masspt_nndata.gifgif masspt_nndata.gif manage 17.3 K 05 Feb 2016 - 13:30 SzymonHarabasz  
masspt_nnmix.gifgif masspt_nnmix.gif manage 16.5 K 05 Feb 2016 - 13:16 SzymonHarabasz  
masspt_npdata.gifgif masspt_npdata.gif manage 15.6 K 05 Feb 2016 - 13:30 SzymonHarabasz  
masspt_npmix.gifgif masspt_npmix.gif manage 16.3 K 05 Feb 2016 - 13:12 SzymonHarabasz  
masspt_ppdata.gifgif masspt_ppdata.gif manage 17.3 K 05 Feb 2016 - 13:30 SzymonHarabasz  
masspt_ppmix.gifgif masspt_ppmix.gif manage 16.4 K 05 Feb 2016 - 13:16 SzymonHarabasz  
masspt_sigdata.gifgif masspt_sigdata.gif manage 17.6 K 05 Feb 2016 - 13:30 SzymonHarabasz  
missid_sim.pngpng missid_sim.png manage 22.0 K 03 Feb 2016 - 15:17 SzymonHarabasz  
nem_kine_seco30.gifgif nem_kine_seco30.gif manage 14.5 K 10 Feb 2016 - 17:29 SzymonHarabasz  
nep_kine_seco30.gifgif nep_kine_seco30.gif manage 12.8 K 10 Feb 2016 - 17:29 SzymonHarabasz  
oamass_avgdata.gifgif oamass_avgdata.gif manage 21.6 K 05 Feb 2016 - 16:02 SzymonHarabasz  
oamass_avgdata_9deg.gifgif oamass_avgdata_9deg.gif manage 21.6 K 05 Feb 2016 - 16:03 SzymonHarabasz  
oamass_avgmix.gifgif oamass_avgmix.gif manage 17.1 K 05 Feb 2016 - 14:04 SzymonHarabasz  
oamass_kfac.gifgif oamass_kfac.gif manage 34.6 K 05 Feb 2016 - 14:04 SzymonHarabasz  
oamass_nndata.gifgif oamass_nndata.gif manage 20.3 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oamass_nndata_9deg.gifgif oamass_nndata_9deg.gif manage 20.7 K 05 Feb 2016 - 16:03 SzymonHarabasz  
oamass_nnmix.gifgif oamass_nnmix.gif manage 16.6 K 05 Feb 2016 - 13:14 SzymonHarabasz  
oamass_npdata.gifgif oamass_npdata.gif manage 16.3 K 05 Feb 2016 - 13:30 SzymonHarabasz  
oamass_npdata_9deg.gifgif oamass_npdata_9deg.gif manage 18.1 K 05 Feb 2016 - 16:03 SzymonHarabasz  
oamass_npmix.gifgif oamass_npmix.gif manage 17.2 K 05 Feb 2016 - 14:04 SzymonHarabasz  
oamass_ppdata.gifgif oamass_ppdata.gif manage 22.6 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oamass_ppdata_9deg.gifgif oamass_ppdata_9deg.gif manage 22.8 K 05 Feb 2016 - 16:03 SzymonHarabasz  
oamass_ppmix.gifgif oamass_ppmix.gif manage 17.7 K 05 Feb 2016 - 13:13 SzymonHarabasz  
oamass_sigdata.gifgif oamass_sigdata.gif manage 20.9 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oamass_sigdata_9deg.gifgif oamass_sigdata_9deg.gif manage 21.7 K 05 Feb 2016 - 16:03 SzymonHarabasz  
oapt_avgdata.gifgif oapt_avgdata.gif manage 26.1 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oapt_avgmix.gifgif oapt_avgmix.gif manage 22.8 K 05 Feb 2016 - 14:06 SzymonHarabasz  
oapt_kfac.gifgif oapt_kfac.gif manage 30.6 K 05 Feb 2016 - 14:06 SzymonHarabasz  
oapt_nndata.gifgif oapt_nndata.gif manage 26.1 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oapt_nnmix.gifgif oapt_nnmix.gif manage 22.2 K 05 Feb 2016 - 14:06 SzymonHarabasz  
oapt_npdata.gifgif oapt_npdata.gif manage 20.0 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oapt_npmix.gifgif oapt_npmix.gif manage 22.9 K 05 Feb 2016 - 14:06 SzymonHarabasz  
oapt_ppdata.gifgif oapt_ppdata.gif manage 26.7 K 05 Feb 2016 - 13:31 SzymonHarabasz  
oapt_ppmix.gifgif oapt_ppmix.gif manage 23.1 K 05 Feb 2016 - 14:06 SzymonHarabasz  
oapt_sigdata.gifgif oapt_sigdata.gif manage 22.3 K 05 Feb 2016 - 13:31 SzymonHarabasz  
sig_corr_weight6_nofactorsVsPiotrFactor.gifgif sig_corr_weight6_nofactorsVsPiotrFactor.gif manage 7.0 K 03 Feb 2016 - 15:18 SzymonHarabasz  
sig_true_likesign.pngpng sig_true_likesign.png manage 18.2 K 03 Feb 2016 - 17:50 SzymonHarabasz  
sig_urqmd.pngpng sig_urqmd.png manage 24.6 K 03 Feb 2016 - 15:18 SzymonHarabasz  
Topic revision: r9 - 29 Feb 2016, SzymonHarabasz
 
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