Presentation is loading. Please wait.

Presentation is loading. Please wait.

Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 1 Calorimetry optimised for jets Henri Videau Jean- Claude Brient Laboratoire Leprince-Ringuet.

Published byBeatrice Rich Modified over 9 years ago

Similar presentations

Presentation on theme: "Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 1 Calorimetry optimised for jets Henri Videau Jean- Claude Brient Laboratoire Leprince-Ringuet."— Presentation transcript:

1 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 1 Calorimetry optimised for jets Henri Videau Jean- Claude Brient Laboratoire Leprince-Ringuet Ecole polytechnique - IN2P3/CNRS Contribution to the session on jet calorimetry CALOR2002 Calorimetry optimised for jets

2 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 2 Calorimetry optimised for jets The physics programme for a coming electron linear collider is dominated by events with final states containing many jets, dijets from H, W, Z. We contend that, in the energy range under consideration, the best approach is to optimise the independent measurement of the tracks in the tracker, the photons in the electromagnetic calorimeter and the neutral hadrons in the calorimetry, together with a good lepton identification. This can be achieved with a good tracker and a high granularity calorimetry providing particle separation, through an efficient energy flow algorithm. But we do not contend that this is a universal panacea Studying that program from the calorimetric side on hardware and software issues is the goal of the CALICE collaboration

3 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 3 Calorimetry optimised for jets radiative qq at 500 GeV WW at 800 GeV Jets at the linear collider _

4 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 4 Calorimetry optimised for jets The analytical energy flow approach has been widely used at LEP but LEP detectors had some draw- backs ALEPH coil in the middle poor longitudinal segmentation 2d digital read- out in the HCAL and the energy ditributions are quite similar projective cracks

5 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 5 Calorimetry optimised for jets Impact of the jet resolution on the physics programme Parametrising 6 jets L=1 ab  1  = 0.6  3   = 0.3  6  in the separation ZZ / WW  0.3  0.6 = loosing 45% of L  0.3  0.6 = loosing 40% of L a lot more work to assess the effect on all the programme work in progress

6 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 6 Calorimetry optimised for jets separation ZZ / WW 0.6 0.3

7 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 7 Calorimetry optimised for jets Reminder on the analytical energy flow basics The energy flow of a jet is written as the sum of its components Such a method relies more on separation of particles than on intrinsic energy resolution Argument  the charged particles make about 60% of the energy and, being of rather low energy, are much better measured by the tracker Isolate the 10% neutral hadron energy  far enough from the interaction point small radiation length small interaction length matched granularity Inside coil Compactness seeing the mips

8 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 8 Calorimetry optimised for jets To profit from that we need a good tracker, not so much on momentum resolution but good track efficiency, small rate of fake energetic tracks good V0 identification small rate of reinteraction a good electromagnetic calorimeter, not so much on resolution but good photon efficiency, even close to tracks small rate of fakes from hadronic debris good electron identification (prompt) a good hadron calorimeter to identify muons to disentangle neutral hadronic showers from charged ones to measure their energy

9 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 9 Calorimetry optimised for jets Elements for a solution concerning the calorimetry Density, good separation electromagnetic/hadron sandwich tungsten / silicium 24 X0 no projective cracks 40 layers thickness < 20 cm cells matched to the Moli ₩ re radius ~ 1 cm2 good efficiency to mips. noise ~ 1/10 mips Radiator adapted to separation/resolution small cells read digitally ECAL HCAL A solution with scintillating tiles is also studied within CALICE

10 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 10 Calorimetry optimised for jets Aspect of the detector

11 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 11 Calorimetry optimised for jets Effect of going from iron to expanded tungsten Resolution Separation

12 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 12 Calorimetry optimised for jets Old results

13 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 13 Calorimetry optimised for jets

14 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 14 Calorimetry optimised for jets Are these performances kept at high energies? All the studies presented here have been done using Mokka an application on Geant4 The jet energies have been obtained in a multi step process knowing the extrapolation of the charged tracks reconstruct the photons in the Ecal subtract the cells of these photons identify the hadrons estimate the energy of the neutral hadrons http://polywww.in2p3.fr/tesla/calicehttp://polywww.in2p3.fr/tesla/calice_software.html through a neural net Different other approaches: thermodynamical or neural net This is the cornerstone of jet calorimetry

15 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 15 Calorimetry optimised for jets X generated  's 8 + charged 4 * neutral had. 1 O reconstructed  's Seeing a W dijet impact on the first 4 X 0 of the calorimeter in  projection The square is 100 mrad wide

16 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 16 Calorimetry optimised for jets number of reconstructed  's versus number of generated  's Some results at 800 GeV on photons

17 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 17 Calorimetry optimised for jets GeV Energy distribution for true photons and reconstructed ones including fakes

18 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 18 Calorimetry optimised for jets Energy distribution of generated true photons and reconstructed true photons GeV A reconstructed photon is associated to a true one if more than 75% of its energy comes from it.

19 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 19 Calorimetry optimised for jets Difference between the true photon energy and the reconstructed one per event. The fit is done with 2 gaussians. Norm1 101.88 Mean1 0.23 GeV  1 7.01 GeV Norm2 35.84 Mean2 - 0.02 GeV  2 18.49 GeV  2 /dof = 1.1 GeV

20 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 20 Calorimetry optimised for jets GeV Photon reconstruction efficiency at low energy

21 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 21 Calorimetry optimised for jets GeV Photon reconstructed energy versus true energy

22 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 22 Calorimetry optimised for jets Energy photons/evt kin versus rec. Distribution of event photonic true energy and reconstructed

23 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 23 Calorimetry optimised for jets Distribution of event photonic true multiplicity and reconstructed

24 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 24 Calorimetry optimised for jets GeV Neutral hadron energy distribution

25 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 25 Calorimetry optimised for jets A more complete reconstruction of the jets at high energy is under way.

26 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 26 Calorimetry optimised for jets Few more informations about the digital HCAL solution. The sensitive detector A gas detector, compact, efficient to mip, high signal and cheap! Streamer or Geiger wire detector RPC's i nformation from DHCAL subcollaboration: IHEP, Interphysica, LLR, MEPhI, Seoul U.

27 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 27 Calorimetry optimised for jets Gap 1.2 mm Glass plates 1 mm TFE/N2/IB 80/10/10 Efficiency to mip > 98% Pads outside Pads inside Signal on 50  : 3 V 1x1 cm 2

28 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 28 Calorimetry optimised for jets Scheme for a digital HCAL signal detection Fe or.. Fe Chip PCB Spacers Glass Pad insulating layer insulating layer resistive layer conductive layer

29 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 29 Calorimetry optimised for jets Read out scheme for a 64 channel chip Reading the chips through a token ring Cost ~ 0.2 Euros/ch ~ 64 million channels

30 Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 30 Calorimetry optimised for jets Conclusions Join the worldwide effort of the CALICE collaboration http://polywww.in2p3.fr/tesla/calice.htmlhttp://polywww To extract the physics produced in an electron linear collider below 1 TeV, a measurement of the jet energies with a stochastic term at a level of 0.3 or below seems mandatory. Such a precision does not seem out of reach with an adequate calorimetric hardware and a proper software. We have a roadmap with hardware developments and prototypes (2004) and with software imagination

Download ppt "Henri Videau LLR Ecole polytechnique - IN2P3/CNRSCalor2002 1 Calorimetry optimised for jets Henri Videau Jean- Claude Brient Laboratoire Leprince-Ringuet."

Similar presentations

SiW ECAL R&D in CALICE Nigel Watson Birmingham University For the CALICE Collab. Motivation CALICE Testbeam Calibration Response/Resolution MAPS Option.

SiW ECAL R&D in CALICE Nigel Watson Birmingham University For the CALICE Collab. Motivation CALICE Testbeam Calibration Response/Resolution MAPS Option.
TIME 2005: TPC for the ILC 6 th Oct 2005 Matthias Enno Janssen, DESY 1 A Time Projection Chamber for the International Linear Collider R&D Studies Matthias.

TIME 2005: TPC for the ILC 6 th Oct 2005 Matthias Enno Janssen, DESY 1 A Time Projection Chamber for the International Linear Collider R&D Studies Matthias.
1 Individual Particle Reconstruction CHEP07, Victoria, September 6, 2007 Norman Graf (SLAC) Steve Magill (ANL)

1 Individual Particle Reconstruction CHEP07, Victoria, September 6, 2007 Norman Graf (SLAC) Steve Magill (ANL)
CBM Calorimeter System CBM collaboration meeting, October 2008 I.Korolko(ITEP, Moscow)

CBM Calorimeter System CBM collaboration meeting, October 2008 I.Korolko(ITEP, Moscow)
LC Calorimeter Testbeam Requirements Sufficient data for Energy Flow algorithm development Provide data for calorimeter tracking algorithms  Help setting.

LC Calorimeter Testbeam Requirements Sufficient data for Energy Flow algorithm development Provide data for calorimeter tracking algorithms  Help setting.
J-C. BRIENT (LLR) 1  Introduction with pictures  Prototype design and construction  R&D on the design of the full scale calorimeter CALICE - ECAL silicon-tungsten.

J-C. BRIENT (LLR) 1  Introduction with pictures  Prototype design and construction  R&D on the design of the full scale calorimeter CALICE - ECAL silicon-tungsten.
INTRODUCTION TO e/ ɣ IN ATLAS In order to acquire the full physics potential of the LHC, the ATLAS electromagnetic calorimeter must be able to identify.

INTRODUCTION TO e/ ɣ IN ATLAS In order to acquire the full physics potential of the LHC, the ATLAS electromagnetic calorimeter must be able to identify.
P. Gay Energy flow session1 Analytic Energy Flow F. Chandez P. Gay S. Monteil CALICE Coll.

P. Gay Energy flow session1 Analytic Energy Flow F. Chandez P. Gay S. Monteil CALICE Coll.
Testbeam Requirements for LC Calorimetry S. R. Magill for the Calorimetry Working Group Physics/Detector Goals for LC Calorimetry E-flow implications for.

Testbeam Requirements for LC Calorimetry S. R. Magill for the Calorimetry Working Group Physics/Detector Goals for LC Calorimetry E-flow implications for.
Some early attempts at PFA Dhiman Chakraborty. LCWS05 Some early attempts at PFA Dhiman Chakraborty2 Introduction Primarily interested in exploring the.

Some early attempts at PFA Dhiman Chakraborty. LCWS05 Some early attempts at PFA Dhiman Chakraborty2 Introduction Primarily interested in exploring the.
 Track-First E-flow Algorithm  Analog vs. Digital Energy Resolution for Neutral Hadrons  Towards Track/Cal hit matching  Photon Finding  Plans E-flow.

 Track-First E-flow Algorithm  Analog vs. Digital Energy Resolution for Neutral Hadrons  Towards Track/Cal hit matching  Photon Finding  Plans E-flow.
 Performance Goals -> Motivation  Analog/Digital Comparisons  E-flow Algorithm Development  Readout R&D  Summary Optimization of the Hadron Calorimeter.

 Performance Goals -> Motivation  Analog/Digital Comparisons  E-flow Algorithm Development  Readout R&D  Summary Optimization of the Hadron Calorimeter.
Simulation of the DHCAL Prototype Lei Xia Argonne National Laboratory American Linear Collider Workshop: Ithaca, NY, July 13 - 16, 2003 Fe absorber Glass.

Simulation of the DHCAL Prototype Lei Xia Argonne National Laboratory American Linear Collider Workshop: Ithaca, NY, July , 2003 Fe absorber Glass.
PFA Development – Definitions and Preparation 0) Generate some events w/G4 in proper format 1)Check Sampling Fractions ECAL, HCAL separately How? Photons,

PFA Development – Definitions and Preparation 0) Generate some events w/G4 in proper format 1)Check Sampling Fractions ECAL, HCAL separately How? Photons,
1/9/2003 UTA-GEM Simulation Report Venkatesh Kaushik 1 Simulation Study of Digital Hadron Calorimeter Using GEM Venkatesh Kaushik* University of Texas.

1/9/2003 UTA-GEM Simulation Report Venkatesh Kaushik 1 Simulation Study of Digital Hadron Calorimeter Using GEM Venkatesh Kaushik* University of Texas.
Application of Neural Networks for Energy Reconstruction J. Damgov and L. Litov University of Sofia.

Application of Neural Networks for Energy Reconstruction J. Damgov and L. Litov University of Sofia.
Track Extrapolation/Shower Reconstruction in a Digital HCAL – ANL Approach Steve Magill ANL 1 st step - Track extrapolation thru Cal – substitute for Cal.

Track Extrapolation/Shower Reconstruction in a Digital HCAL – ANL Approach Steve Magill ANL 1 st step - Track extrapolation thru Cal – substitute for Cal.
Progress with the Development of Energy Flow Algorithms at Argonne José Repond for Steve Kuhlmann and Steve Magill Argonne National Laboratory Linear Collider.

Progress with the Development of Energy Flow Algorithms at Argonne José Repond for Steve Kuhlmann and Steve Magill Argonne National Laboratory Linear Collider.
Development of Particle Flow Calorimetry José Repond Argonne National Laboratory DPF meeting, Providence, RI August 8 – 13, 2011.

Development of Particle Flow Calorimetry José Repond Argonne National Laboratory DPF meeting, Providence, RI August 8 – 13, 2011.
Summary of Calorimetry/Muon Sessions Burak Bilki University of Iowa Argonne National Laboratory.

Summary of Calorimetry/Muon Sessions Burak Bilki University of Iowa Argonne National Laboratory.

Similar presentations

Ads by Google