Some investigations on Shower in Aug11 DST Szymon Harabasz Version: 15 November 2015

Some investigations on Shower in Aug11 DST

Szymon Harabasz

Version:20 April 2023

PID plot

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mass

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Pre – RPC correlations

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All RPC clusters to all Pre hits in event

Closest RPC clusters matched with all tracks to all Pre hits in event

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Selct only bottom parts of both detectors

Correlation fairly better!

All RPC clusters to all Pre hits in event

Closest RPC clusters matched with all tracks to all Pre hits in event

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ϴcand with different cuts

Positive particles Negative particles

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Φcand with different cuts

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Angular distributionsall Particle Candidates


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Angular distributionsParticle candidates matched with Pre

and correlated with Post I


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Row-Col for Shower hits best matched with particle candidates


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ϴcand vs. Shower hit rowAug 11


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All particles Negative particles

ϴcand vs. Shower hit rowNov 10

Why previously there was no problem to calculate efficiency in bottom rows?

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Sum0 vs. momentum

Negative pions Protons

π- Protons16

Sum1 vs. momentum

Protons

Protonsπ-17

Sum2 vs. momentum

Protons

Protonsπ-18

Sum1-Sum0 vs. Momentumsector 1

Protonsπ-

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Sum2-Sum0 vs. Momentumsector 1

Protonsπ-

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Mean Sum0 - protons

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Mean Sum1 - protons

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Mean Sum2 - protons

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Mean Sum0 – π-

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Mean Sum1 – π-

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Mean Sum2 – π-

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Shower alignment not perfect?

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Digitization

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EffPre(β)

All particlesNegative particles

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EffPost I(β)

All particlesNegative particles

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EffPre(position)

Negative particles All particles

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EffPost I(position)

Negative particles All particles

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HParticleTrackSorter- how does it work?• Fill internal structures from HParticleCand by

callingInt_t HParticleTrackSorter::fill(Bool_t (*function)(HParticleCand* ))(eg. Bool_t HParticleTrackSorter::selectHadrons(HParticleCand* pcand))

• For accepted objects flags are evaluated• Int_t selectBest(HParticleTrackSorter::ESwitch byQuality, Int_t byParticle) sets isBest... flags (here also kIsUsed is marked)

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Looking for leptons

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First attempt• Read data from all HparticleCands, write it to ntuple, apply

conditions when drawing histograms with Draw method• Meta matching quality < 4• Average charge > 70• Inner segment chi2 > 0• RK chi2 < 1000• Graphical cut:

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System 0, p < 150 MeV/c

System 0, p < 150 MeV/c

System 1, 200 < p < 300 MeV/c

System 1, 200 < p < 300 MeV/c

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Next attempts• Second:

• The same conditions as in the first attempt plus

• kIsUsed flag• Third:

• The same conditions as in the first attempt plus flags:

• kIsAcceptedHitRICHMDC • kIsAcceptedHitInnerMDC • kIsAcceptedHitOuterMDC • kIsAcceptedRKMETA

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∆θ RICH – Track, System 0

All histograms in one figure scaled to (almost) common maximum value41

∆θ RICH – Track, System 1

42 All histograms in one figure scaled to (almost) common maximum value

Second attempt

Third attempt

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Fourth attempt

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Read data from all HparticleCands, write it to ntuple, apply conditions when drawing histograms with Draw method

Meta matching quality < 4Average charge > 70Inner segment chi2 > 0RK chi2 < 1000β > 0.9

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Fourth attempt

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Fourth attempt – positive particles

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Fourth attempt – negative particles

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Fourth attemptScaled to common max value(on both plots separately)

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Fourth attemptScaled to common max value(on both plots separately)

Shower response on leptons?

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Fourth attempt

Shower response on leptons

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Sideband method

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Sideband method

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Sideband method

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Sideband method

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Sideband method

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Everything After sideband background subtraction

Sideband method

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Sideband method

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Sideband method

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Oops…

Sideband method

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Sideband method

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Sideband method

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Something is wrong in some sumdiff bins.Let’s check it.

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Sideband method in sumdiff bins

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Time of flight

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Backup slides

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Sum0, Sum2 > 0

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Post I efficiency

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Sum0, Sum1, Sum2 > 0

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Sum0, Sum1 > 0 and RPC cluster exists

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Sum1 > 0 and RPC cluster exists

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Pre efficiency

Sum0 is always > 0

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Shower Hit Row-Col – cands matched with Pre and correlated with Post I


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Theta for all and negative particle candidates


Here all tracks matched with Shower are considered

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Phi for all and negative particle cands

Here tracks matched with Shower and RPC at the same time are considered

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Sum0 & Sum1 vs. beta

Protons

Protonsπ-87


Pre to Track matching qualityas a function of a position onthe detector

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Documents

Some investigations on Shower in Aug11 DST Szymon Harabasz Version: 15 November 2015