atlas pisa report

Pisa 23 Giugno 2005 C.Roda for the Pisa ATLAS group

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ATLAS Pisa report

Experiment status

Pisa responsabilities

Activities: Commissioning, calibration, physics analysis

Requests


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Commissioning is being done by all Institutes: F/E electronics, bus, HV, LV etc. Move to z=0 +final alignment based on survey data for tiles+LAR ~25 Aug. 05.

Barrel installation completed on 10/12/2005

10 Dec 2004


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Present status of the pit


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F/E electronics tests with Mobidick

September 2004

Concerns last certification tests of the individual FE Drawers,before Commissioning (using the local portable Test Bench MobiDICK).All elements are tested, including cooling circuitry + fibers (with pulse LED)

All drawers installed in the Barrel, few channels still to be fixed.


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Use MOBIDAQ:-on truck + temporary cables-At Z=0 with final cables

MOBIDAQ in USA15

TTC & GLINK fibers

CANbus patch panelMobiDAQ

Row 16 Row 19

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F/E electronics tests with MobiDAQ

USA15

Tests of the complete system on 8 modules at time: Drawers, buses, CIS, Laser, HV, LV... Use of the online Monitor for immediate diagnostic and offline analysis

MobiDAQ is also used for preliminary Cosmic Runs.


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Fingers and drawers


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Fix a drawer


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Trigger boards ADC for the trigger

Signals from 8 drawers (4 modules) from S-links for the digital readout

TTC modulesMobiDAQ

TTC signal splitter


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MobyDAQ: sample of results

Pedestal rms (noise)

CIS scan (gain)

An electronic noise lower than that obtained at the

TB has been reached.


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Cosmic Ray Tests on Preassembled Extended barrel at 185

Tile Barrel lower modules

Special 9U VME, FPGA programmable6 Super Drawer/unit

Use MobiDAQ and temporary trigger logic, Online Monitoring + simple offline analysis


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AT

LA

NT

IS

Geo

Mod

el

Allows: -Check for dead-channels -HV-Cesium equalization- Compare with Tbeam data

Cosmics: first results

Rates in UX15: 130 /h (TileCal)


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Cosmics Runs, Energy (pC) for the B-Cells(Check dead channels)


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Cosmic Ray Tests in the Pit – 22.6.2005


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Main steps for barrel:

•until end Aug: Installation and commissioning WPs standalone in USA15/UX15

•7-29 September: cables/fibers/pipes installation to the fingers rotating in sectors every 2 days (8 fingers/day) with several teams (TC contractor, Protvino, CF, LIP, tile techs pool+…) with MOBIDAQ.

•9 Sept->16 November : install LV, commissiong 8 fingers at the time rotating in sectors every 6 days (2.7 fingers/day) with MOBIDAQ, ROD DAQ (if available) and MOBIDICK when needed.

•16 Nov-7 Dec: commission the 2 barrel partitions (~5000 channels) with ROD DAQ

•The EBC and EBA will follow during end 2005, first half of 2006

Overall commissioning scenario


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Organization

We have started a reorganization of TileCal defining things to be done (Work Packages) and responsabilities, hopefully to improve on the efficiency.This process has now converged.

In this scheme Pisa is well represented at all levels.


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TileCal Organization (1)


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Activities in Pisa

Laboratory tests (PMT) Simulation Analysis


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Tests in Pisa: PMT long run tests (G. Usai)

Test of stability of PMT operating in LHC

environement for 1-2 years at full luminosity.

We badly need air conditioning

system to have a stable and reliable

system


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Tests on fibre agingContinuazione dei tests su fenomeni di invecchiamento di fibre curvate (come quelle di Tile).L’idea e` di monitorare con lo stesso PMT una fibra curva ed una dritta eccitate da una stessa sorgente (laser-fotodiode + pulse driver) . Vogliamo usare una DAQ board che abbia una interfaccia a ROOT e scrivere un sistema di acquisizione in ROOT.

Chiediamo finanziamenti per assembleare questo sistema di test.


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Sample of results being obtained

Stability (Am)

GainI-dark

Quantum eff.

We are still debugging. Most of the problem solved.• Am source is “old” • Poor room temp. conditioning• Some channels shows jumps in gain due to the divider. We are investigating if the source of this problem is the one already found or if it is new one …

One measurement lasts 12 h light is setting: Qpmt = 50 CIncrease light to MB (about 10 times more) at LHC

Time


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Other ongoing activities:•On Line Monitor (Chiara, Andrea, Paolo); Chiara Roda coordinates the effort of a group of physicists from various subdetectors. The work started as an OnLine monitor for TileCal TB, evolved as “GNAM” at the CTB and now looks as a promising approach to a “low level” monitor for many sub detectors for ATLAS. GNAM is now a package of the standard TDAQ software. We are now participating to the monitor working group of ATLAS.•monitor snapshot•TileMuId (G. Usai); the work continues in collaboration with muon community. The method of tagging muons with TileCal is a standard and well debugged tool in Athena and HLT and is evolving as a method for

•Isolation of muons in the calorimeters•Recovery of muons large energy losses

•Comparison G4/CTB (Andrea, Anna) has made large progresses and should be near to the end.•“Real Detector Simulation” in G4 (Anna)


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Comparison CombinedTB - Geant4 (A. Dotti)

pions in LArg+Tile

During spring/summer 2005 we acquired data with a slice of ATLAS

These data are now being used for many analysis i.e. tuning of G4 simulation.


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Comparison CombinedTB - Geant4 (A. Dotti)

pions in LArg+Tile

• Pions at= 0.35, Ebeam =20 - 350 GeV

• Data calibrated at e.m. scale• Tested methods of energy reconstruction in LArg (still to be

refined …)• Fixed few little bugs (now in Athena version 10.0.2)

• Now agreement in mean energy deposit is within 3% (Ebeam = 20 - 350 GeV).

• Works on resolution and shower shape still going on.


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Energy distribution Ebeam = 180 GeV

180 GeV =0.35

LArg

TileCal

LArg + TileCal

E (MeV)

E (MeV)

E (MeV)

Ent

ries

(A

.U.)

Ent

ries

(A

.U.)

Ent

ries

(A

.U.)


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Mean reconstructed energy

3%


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20 Gev 50 Gev

100 Gev 200 Gev

Using weighting techniques on CTB data (Chiara, Iacopo, Andrea)

i

iiii E

baEw )(

The energy of cell i is weighted:

a, b are obtained by minimizing:

e beam

beamii

E

EEw2

Linearity Resolution

RawCorrected


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This activity comes along with the Jet Energy reconstruction/calibration (Chiara, Iacopo).

Calibration of DC1 dijet (QCD) sample has been done, in progress the work on the “Rome-layout” production.

Few methods of jets reconstruction (cone, kt, topojet) and then recalibration.

Results of our method: linearity +-2% (0.02-4 TeV) resolution improves by 15%

The package is now one of the standard method in Athena.

Chiara is becoming the convener of the jet reconstruction and calibration for ATLAS group


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Physics analysis.Two analyis to check the possible use of a LVL2 “b-tagger” (FASTRACK a la CDF or battery of CPUs).

•pp->j+Z+X with Z->bb (b-tagged jets); if possible to trigger on this channel it would be the ideal way of calibrating the b-jets.

•pp->bb+A/H with A/H->bb (3/4 b-tagged Jets); this is a standard discovery channel of the supersymmetric Higgs.

In both studies the b is assumed to decay hadronically and be identified by impact parameter.

The advantage is the BR, the disadvantage is the tag efficiency, mistags.

•pp->Hqq +X with H->


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Signal QCD

LVL1 RateKHz

- 4.9

LVL2 RateHz

- 98-10

Kin. Sel+2bfb

1098 195000

80<Mbb<100

fb

551 21100

Jet+Z->bb (V. Cavasinni and I. Vivarelli)

S/B S/√B30 fb-1

2.5% 20.6

Needs to lower the jet thresholds to have sidebands for bknd subtraction, hence reduce the rates at LVL2 by fast tagging b-quarks.


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pp-> bb+A/H->4b (3/4 tagged) (V. Cavasinni and I. Vivarelli)

Selection εS εB S(30 fb-1)

B(30 fb-1)

S/B S/√B

Official ATLAS HLT menu

0.11% 1.6 10-9 140 4630 3.0% 2.0

Improved multijet trigger

1.1% 1.3 10-8 1380 36850 3.7% 7.2

The proposed trigger allows to have a factor 10 more statistics.

To avoid too large QCD rate it needs fast b-tagging.

It is a counting experiment where the new scheme of triggering can improve the significance over the standard trigger menu.


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ATLAS light HIGGS discovery potential at 30 fb-1

• Vector boson fusion qqHat least one decaying leptonically) fundamental at masses 120-140 GeV.


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HVBF hhF.Sarri, V. Cavasinni, I.Vivarelli)

In this channel, comparing to the one with at least one tau leptonic decay, we have an additional

huge background from QCD:

fbhhBRHBRVBFsig 125)()(

11103.1)10(

GeVpTQCD

sig

The algorithm to identify ’s and reject QCD jets is the fundamental ingredient.

Use the results of the Milano,Freiburg groups: D. Cavalli, M. Heldmann


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• at least 4 jets; •2 tagged tau jets with pt over 45 and 35 GeV;•missing transverse energy over 45 GeV;•2 forward candidates with pt above 60 and 40 GeV;•negative product of forward jet eta and > 4; •taus between 2 forward ;• 0 < x1(2) < 1 and taus not back to back (< 3);•forward jet invariant mass > 700 GeV; •no jet with pt > 30 GeV between the forwards, apart from the taus;•cut on mass window : 104 GeV < m < 150 GeV.

Example of analysis cuts: Hard cuts

Studies are carried out on fast detector simulation however the tau tagging has been deeply studied on full simulation and on real data from D0.


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“Hard” cuts

HVBF hh signal + QCD backgroundpreliminary

30 fb-1

300 fb-1


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“Soft” cuts: essentially lower pt thresholds

HVBF hh signal vs QCD backgroundpreliminary


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ttbar background

pbinclttbar 548)( Both Ws dacay in ~

4103.2 ttbar

sig

On ttbar events the rejection

from parameterization is worse by about a factor 2.

Contribution of this background in the mass window (104 – 150 GeV) is

negligible.


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Important background

*/Z + jets with */Z has a = 1742 pb:736 pb with two true hadronic taus.

UNDER STUDY

*/Z +jets background


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Composizione del gruppo 2006Paolo Adragna (Dott) 100.

Vincenzo Cavasinni (PO) 80.

Tarcisio Del Prete (INFN) 100.

Andrea Dotti (Dott) 100.

Vincenzo Flaminio (PO) 20.

Danilo Giulietti (PA) 20.

Francesca Sarri (Dott) 100.

Anna Lupi (Ass) 100.

Chiara Roda (RU) 80.

Giulio Usai (Ass) 100.

Iacopo Vivarelli (Ass) 100.

FE 9.0

Neolaureati 1 livello: Paolo Francavilla

Laureandi : Maria Canneri, Paolo Francavilla


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Preventivi 2006 Missioni Interne …… 1.5 9 FE = 15 k€

Consumo .................................. 15 k€

MOF 49 KchF

CI 72 KchF

CC 0 KchF

Materiale Inventariabile .......… 34 k€

Implementazione DAQ&sistema di test fibre:

DAQ board 10 K€

Crate VME 7 K€

Driver Pulse + LaserFotoDiode 6 K€

Aggiornamento farm (Tier3):

5kSI2k CPU 6 K€

dischi per 2TB 5 K€

Totale ME: 30 + 7 mu

Missioni Estere 1.5 x 9 mu = 13.5 mu

4 coordinamenti 4 mu

responsabilita’ commissioning 12 mu

tecnici assemblaggio 7 mu

Richieste alla sezioneRichieste alla sezione : 7 m.u7 m.u..

7 mesi uomo tecnici al CERN per Commissioning al pit di Tile Cal

all’inizio del 2006.


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Back

Energy in a cone around a tagged muon (G. Usai)

Cone radius


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• Mean value for CIS signal as PMT function• Distribution (48 PMTs) of mean value for CIS signal• Distribution (48 PMTs) of rms for CIS signal• Signal Timing as PMT function (no corrections applied)

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