Download presentation

Presentation is loading. Please wait.

Published byJena Cochran Modified over 2 years ago

1
Jet/Met meeting 11/21/2002 Jet studies 2. Fake jets in p13.02.00 and p11.13.00 3. Effect of coarse hadronic layers and negative cells on jets 1. Jet chunk certification in p13.02.00 Emmanuel Busato

2
JetChunk certification in p13.02.00 Comparison between JetChunk in p13.02.00 TMB and jet branches in p13.02.00 root-tuple (created from DSTs) (algo=JCCB)

3
n90 Root-tuple TMBTMB- root tuple

4
E Root-tuple TMBTMB- root tuple

5
Pt Root-tuple TMBTMB- root tuple

6
EMF Root-tuple TMBTMB-root tuple

7
Phi Root-tuple TMBTMB-root tuple

8
Eta Root-tuple TMBTMB-root tuple

9
JetChunk certification summary - For floats, difference TMB root- tuple 10**- 3 - An exception is variable EMF where difference is 5.10**- 3 - Problem with n90 ?

10
Fake jets in p13.02.00 and p11.13.00 Lot of fake jets in p11.13.00 => new quality cut : f90<- 0.5CHF + 0.8 What is the situation in p13.02.00 (where ZS : 2.5 ? - Criterion : f90 if high =>fake jet if low => good jet

11
in p11.13.00 data CHF Cone R=0.7 Cone R=0.5 N1 good jets N2 fake jets N2/N1 33 N2/N1 60 N1 N2

12
in p13.02.00 data N2/N1 16 Cone R=0.5 Cone R=0.7 N2/N1 30 N2 N1

13
The number of fake jets is reduced by a factor of 2 in p13.02.00, where we have 2.5 of zero suppression (instead of 2.1 in p11.13.00) Fake jets in p13.02.00 and p11.13.00 summary

14
Current status of the algorithms : Jets are constructed with a list of positive energy towers. These towers are made of positive and negative energy cells. What happens if we remove corresponding layers (15, 16, 17) ? (input of the algorithm : calorimeter towers without CH layers) Not consistent with Met calculation, which is done with towers > 200MeV or cells > 100MeV Coarse Hadronic may be responsible for fake jets What happens if we keep only positive cells in jets ? Effect of coarse hadronic layers and negative cells on jets

15
Cone R=0.5 N2/N1 7.5 N2/N1 16 N1 N2 N1 N2 N1 N2/N1 7.5 Current algo Without CH layers and neg cells Without CH layers Cone R=0.7 N2 N1 N2 N1 N2 N1 N2/N1 14 N2/N1 30 N2/N1 14 Current algo Without CH layers and neg cells Without CH layers

16
Summary => reconstruction without CH layers reduces the number of fake jets by a factor of 2

Similar presentations

OK

MULTIPLICATION EQUATIONS 1. SOLVE FOR X 3. WHAT EVER YOU DO TO ONE SIDE YOU HAVE TO DO TO THE OTHER 2. DIVIDE BY THE NUMBER IN FRONT OF THE VARIABLE.

MULTIPLICATION EQUATIONS 1. SOLVE FOR X 3. WHAT EVER YOU DO TO ONE SIDE YOU HAVE TO DO TO THE OTHER 2. DIVIDE BY THE NUMBER IN FRONT OF THE VARIABLE.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on autonomous car Ppt on foley catheter Ppt on types of trees Ppt on network layer design issues Ppt on satellite orbits Ppt on any one mathematician rene Ppt on diode family matters Ppt on soft skills download Ppt on sports day images Download ppt on square and square roots