COMPASS: COMPASS STATO DELL'ESPERIMENTO E DELL’ANALISI · csn1 21/9/2004 f. bradamante compass:...

CSN1 21/9/2004 F. Bradamante

COMPASSCOMPASS: STATO DELL'ESPERIMENTO E DELL’ANALISI

F. Bradamante

• SITUAZIONE GENERALE• RUN 2004• PROGETTI PER IL 2006• STATO ANALISI

CSN1 Assisi 21/9/2004


COMPASSSITUAZIONE GENERALEMinute del SPSC e del RB

SPSC - 27 aprileThe Committee congratulates the Collaboration on the substantial progress achieved in detector performance and data analysis since it last reviewed the experiment. The Committee strongly supports the COMPASS request for adequate beam time in 2004, and considers that further data taking after the shutdown year 2005 is essential if the experiment is to achieve all its aims. The Committee considers it very important that the Collaboration continue to work with the highest priority towards the achievement of a measurement of ∆G/G as quickly as possible. The Committee will complete its recommendations concerning the proposed plans presented by COMPASS for its 2004 data taking at its next meeting when a clearer picture of progress this year overall is available. The Committee asks the Collaboration for a detailed running strategy for data taking after 2005.

RB - 27 maggio The status of COMPASS / NA58 was reviewed. Substantial progress has been made by the collaboration, whose highest priority is an accurate measurement of DG/G. A hadron run has been proposed during 2004, but the decision on this has been deferred to the next SPSC meeting.


COMPASSSITUAZIONE GENERALE


COMPASSSITUAZIONE GENERALEPreparazione del meeting dell’SPSC di Villars:

soft&hard session 24/25 September

3 talk COMPASS

muon physics after 2005 [beyond 2010] (contributo di Trieste)hadron physics after 2005 (contributo di Torino)future physics beyond 2010

e sette invitati COMPASS

in preparazione, tre riunioni dedicate;25 giugno, 2 luglio, 29 luglio


COMPASS

RUN 2004


COMPASSRUN 2004

Nuovo 2004:GEM-11BMS-6W45 (2 st)Cinderella, etc…

Non ancora installati: Si cold stations (run adronico)

Miglioramenti/completamenti:ECAL2, BMS, RICH, Straws, MM…DCS, DAQ

Spettrometro stabile …Detector trips :

Straws, PDs, MMsR/O Errors :

MTV err, evb crashes, Hotlink conn, Richcntr, etc…


COMPASSRUN 2004 - problemi maggiori spettrometro

RICH methane missing pressure Reason: switch-over electro pneumatic valve did not work

Actions taken: 1) air pressure increased; 2) 4 bottles in a row

Water disaster on SM2Reason : Cooling water hose brokenAction taken : Hose replaced, new hoses ordered. Replacement of all hoses at latest in the 2 weeks stop in October.

Lost target polarization Reason : apparent missing water pressure in BA82Action taken : Processor reset. Report written.

Gas alarmReason : malfunction of the SDC mobile flammable gas detector (air pump)Action taken : detector to be replaced with a standard one.


COMPASSRUN 2004 - Silicon cold station

Reason: Detectors cracked during cool down

Actions taken in Munich: Slower cool downImproved ELMB monitoringMany tests at Munich

PlansWill arrive mid-SeptemberGet cold System operational at CERN in SeptemberSetup of cold system in beam in OctoberUse Water filter from Cryogroup


COMPASSRUN 2004

0%

20%

40%

60%

80%

100%

120%P

1A19

.5.

28.5

.P

1B 9.6.

18.6

.25

.6.

P1C 2.7.

9.7.

16.7

.23

.7.

P2A

30.7

.6.

8.13

.8.

P2B

20.8

.27

.8.

P2C 3.9.

10.9

.17

.9.

24.9

.

P1A P1B P1C P2A P2B P2C

SPS Eff.COMPASS Eff.

SPS septum

Scrubbing&25ns

SPS septum SM2 H2O leak & poln loss

poln loss

½ intensity


COMPASSRUN 2004 - statisticaLongitudinal Running Mode

• P1A: 111+ and 108- runs• P1B: 44+ and 41- runs• P1C: 201+ and 201- runs with 232 runs ½ intensity

146+ and 140- runs corrected for intensity• P2A: 83+ and 87- runs

• Sum: 384+ and 376- runs760 runs in total

Transversal Running Mode

• 13.8 – 18.8: 80 runs with spin up in up cell• 19.8 – 25.8: 72 runs with spin down in up cell

152 runs in total vs. 760 longitudinal, i.e. 20% so far

a fine agosto …


COMPASSRUN 2004 - run adronicoDa fascio µ a fascio adroni

Date : Oct.4, 8am – Oct.19, 4pm.

Activities in the hallRemoval of the solenoid and the DR

Removal of 3He/4He, Warm-up, El. Cables, Pipes, Target materialInstallation of hadron run detectors

Cedars, Veto Box, Primakoff hodo, Beam killers, Installation of cold silicon stations

Removal, re-installation of warm stations, re-cabling, alignment, etc…Replacement of SM2 hoses , Instillation of RW

Tests and Calibrations (with beam)Cedars – final tests needed, with 25 ns beamECAL2 – calibration to be done with e- beamRICH – first tests with hadrons hadron beamRICH – test of the APV read-out C4F10 required


COMPASSRUN 2004 - run adronicoSCHEDULA SPS


COMPASSRUN 2004 - run adronicoPlanning

DayDate

Beam Pol TargetSiliconsHadron det.CedarsRICHECAL cal.

M2 Beam

Fri Sat Sun

Beam

Mon Tue Wed Thu Mon Tue Wed Thu Tue Wed ThuFri Sat Sun Mon

10/4 10/5 10/6 10/7 10/8 10/9 10/10 10/11 10/17 10/18 10/1910/12 10/13 10/14 10/15 10/22 10/23

Sun

25ns --- 25ns --- 25ns--- 25ns --- 25ns 158GeV --- 158GeV --- 158GeV

SatFri

10/20 10/2110/16

Mon Tue

10/24 10/25 10/26

TestsRICH C4F10 removal

Install

e-

----------- Detector installation ------------- Calib Calibra

Silicon installation and tests

Polarized Target removal

RICH

SPIN 2004

Due settimane per tutte le operazioniSchedula stretta14 giorni in totale per fisica adronica


COMPASS

PROGETTI PER IL 2006

Possibili opzioni di run:• adronico (Primakoff / central production)• muoni protone (NH3)• muoni deutone (6LiD)


COMPASSPROGETTI PER L’UPGRADE DELLO SPETTROMETRO - dal 2006Dai meeting del TB

DAQ upgrade

Munich (TUM)Si: new cold station

WarsawSciFi: additional station

SaclayLarge size Drift Chamber

TUM, Saclay, Trieste (supp. log.)RICH1 : proposal for APV-based R/O

Trieste, Torino S. Dalla TorreRICH1 : proposal for MAPMT read-out

ProtvinoECAL1 and ECAL2: completition

Torino, Dubna D. PanzieriRich Wall

New PTM


COMPASSMAGNETE COMPASS

dicembre 2003:firmato il MoU CERN/DAPNIA/COMPASS:

finalizzazione della strumentazionetest completi

2004: consegna a Saclay

test di vuoto, raffreddamento, campo massimo, omogeneita’,…

consegna al CERN

2005:installazione, tests, magnetic measurements, polarization


COMPASSMAGNETE COMPASS - 2

Accordo traOD/COMPASS/CEA finalizzato

Piani per test comuni OD/CEA a Saclay pronti

Trasporto a Saclay:~ fine settembre

Test conclusi:~ 5 settimane dopo

l’arrivo a Saclaysolenoide + dipolo + coilscompletamente assemblati


COMPASSECAL1 e ECAL2

1.97

2.86 20 16

28

8

75

44

GAMS OLGAECAL1

L x H : 3.97 x 2.86 m2Hole : 1.07 x 0.61 m2OLGA : 143 x 143 mm2GAMS : 38.2 x 38.2 mm2

ECAL2L x H : 4.40 x 1.97 m2Hole : 38.2 x 38.2 cm2GAMS : 38.2 x 38.2 mm2Mainz : 75 x 75 mm2P/S : 38.2 x 38.2 mm2

3.97

36

24

68

5226

12

MainzGAMS

P/S

4.40


COMPASSECAL: produzione centrale

From Donskov, Fut. Phys@compass, 2002

ECAL1

WAD

Decadimento ηη -> 4γ

0.3634 m-11 m

0.18-34 m16 m

AccγECAL2GAMSECAL1Distance

Desiderabile aumentarel’accettanza per γ con un “Wide Angle Electromagnetic Calorimeter” prima di SM1(Accγ ~ 0.95)


COMPASSECAL: ∆G

200339 mrad

2006180 mrad

D0* D0 + π0

(simile a D±* D0 + π± )selezionando π0 2γ in ECAL


COMPASSLarge size Drift Chamber

Struttura come DC1/2/3.Cella: 7mm 9mm (OK per flusso).Dimensioni: Lint/lint = 2.89m/2.06m, Lext/lext = 3.36m/2.56m

DCs: 3 Straws: 1 1/2 2x1/2

dopo SM2

.....

DC1 DC2 Straws

PTM COMPASSPTM COMPASS

PTM SMCPTM SMC

Lay-out previsto

Lay-out 2002

~ 200mrd

Mecanica OK Electronica: da decidere … Planning : 2006 possibile

DC4


COMPASSUpgrade DAQ - per 2006

SoftwareDAQ software upgradesFilter upgradesOnline software improvements

Resources neededDAQ consolidation and Network : 335 kSFFilter farm : 720 kSF

ManpowerTMU not enough: help req

Hardware consolidationReplace many ROBs and EVBsExchange old S-links, etc.Infrastructure,…

Bandwidth upgrade : goal is to reach 100 MB/network link

I/O software Network components

Filter farmAim : reduce hadron run data by an order of magnitudeSpeed : 100-200 ms/event Proposed : Blade-server rack with 300 CPUs.


COMPASSRICH1 maPMT

photon detectors in the central photon detectors in the central region : region : maPMTmaPMT

(HAMAMATSU R7600(HAMAMATSU R7600--M16M16--03)PRINCIPLE

03)

cathode replaced by cathode replaced by a a maPMTmaPMT panelpanel

~ 600 ~ 600 maPMTmaPMT


COMPASSRICH1: APV read-out

Partendo dall’idea di A. Colavita:Configurare il chip APV per leggere ilRICH

Parametri APV modificabili

Segnale campionato tre volte Expected time resol : ~100 ns

Catena R/O:APV SGADC Gesica

StatoCarte prototipo pronteTests in EHN2 a fine luglioTest da continuare settembre/ottobre


COMPASS

STATO ANALISI


COMPASSANALISI - ISTITUTI

Trieste 45 kSi2kTorino

28 kSi2k

GridKa 45 kSi2k

Freiburg 17 kSi2k

Saclay/Lyon (27 kSi2k)

TUM 26 kSi2k

Dubna & Protvino 43 kSi2k

CERNproduction site!

120 kSi2k

1 Pentium IV 3GHz ~ 1 kSi2k


COMPASSPRIMI RISULTATI DI FISICA (run 2002)

presentati a Parigi, a DIS04, …• A1

d

• high pT

• Collins asymmetry

ma ovviamente molto lavoro anche sugli altri canali: • ∆G/G da open charm• produzione di Λ con PT longitudinale e trasversa • ∆q • produzione di ρ e φ• asimmetria di Chan• ricerca di pentaquark (Σ--, θ+)e sui dati 2003 e 2004

released

released


COMPASSattivita’ di analisi 2004 / 2005

COMPASS TORINOLe attivita’ di analisi sono/saranno principalmente rivolte a:

simulazioni MC in configurazione trasversa;l’analisi dei dati trasversi con produzione di lambda;simulazioni MC per effetto Primakoff;l’analisi dei dati del run adronico (in particolare Primakoff);l’analisi dei dati longitudinali 2002-2003-2004 con produzione di lambda e relativi MC

COMPASS TRIESTEfinalizzazione analisi dei dati 2002 con polarizzazione trasversa per la misura delle asimmetrie di Collins e Sivers analisi dei dati con polarizzazione trasversa 2002-2004 per la misura di asimmetrie nella produzione di adroni, incluse produzioni MC relative, in collaborazione con Bonn Erlangensviluppo/mantenimento software generalesoftware RICH

Primi test (indipendenti) di tools Grid:Torino: uso hardware per produzione MCTrieste: uso Alien per “catalogo”/accesso dati MC


COMPASS∆G/G: OPEN CHARM - SIGNAL & FoM

1 week(30) 2004 (5 “days”)FoM ~ 112

¾·2002 (25 “days”)FoM(*) ~ 120

FoM2004 ~ 4.5 · FoM2002(*)FoM=S/(1+B/S)


COMPASSOPEN CHARM


Sonja Hedicke, Universität Freiburg,Analysis Meeting, CERN, August 2004

•Data Selection•Xcheck on 2003 data•Q2 > 1 GeV2 asymmetrieswith some systematics

•2002 data vs MC•Gluon kinematics

µr 'µ

Pr

q

qg

γ

High-pt Analysis

COMPASSHIGH pt


COMPASSHIGH pt

Consecutive and global configuration

+−

−+−

==→

''

''*

21

du

du

du

du

BT

dhhd

LL

NNNN

NNNN

fDPPA

DA γ

µ

BN

i iN

i i

N

i iN

i iN

i iN

i i

N

i iN

i i

T

d fDPwww

ww

ww

wwP

Adu

du

du

du

=

+

−−

+

−=

∑∑∑∑

∑∑∑∑ with,

21

''

''

2222*γ

Targetpolarisation PT ≈ 0.5Strahlpolarisation PB ≈ 0.8Dilutionfaktor f ≈ 0.4Depolarisationsfaktor D ≈ 0.6

224702553132003

68231119532002

Q2 > 1 GeV2without Q2 cutevents


COMPASSHIGH pt

PGF and Background

PGF QCD-ComptonDIS L.O.

resolvedPhoton

at low Q2

need agreement between data and MC to entangle the contributionsof the different subprocesses MC studies, comparison with 2002 data


COMPASSHIGH pt

First ALL measurement from

scale uncertainty of 65%not included

p↑ + p↑ → π0 + X, η ~ 0

’03 data

GG

GGALL

∆⊗

∆~

pQCD NLO predictionsbased on GRSVpolarized PDFs

negative ALL difficult toaccommodate in the framework of pQCD !


COMPASSHIGH pt


COMPASS∆G/G

CON TUTTI I DATI DEUTERIO 2002-2004LE PREVISIONI SONO

σ(∆G/G) = 0.24 da open charm

σ(∆G/G) = 0.05 da high pT all Q2σ(∆G/G) = 0.16 da high pT Q2>1

resolved γσsyst ?


COMPASSPRODUZIONE ESCLUSIVA ρ e φ

|t ’| < 0.5 GeV2

7.5 < W < 16 GeVQ2 > 10-3GeV2


COMPASSPRODUZIONE ESCLUSIVA ρ e φ

• 16 % of total 2002 statistics

• no MC corrections yet


COMPASSPRODUZIONE ESCLUSIVA ρ and φANGULAR DISTRIBUTIONS

pT > 0.15 GeV Q2> 0.05 GeV2


COMPASSPRODUZIONE ESCLUSIVA DI ρ

If SCHC ->High precision measurement of spin density matrix element

2 (GeV/c)2Q-210 -110 1 10

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4COMPASS PRELIMINARY

TσLσ

R =

2 (GeV/c)2Q-210 -110 1 10

-0.5

0

0.5

1

1.5

2

2.5

3

3.5

4COMPASS PRELIMINARYZEUSH1E665

TσLσ

R =

2 (GeV/c)2Q-210 -110 1 10

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

= 10 GeVWCOMPASS PRELIMINARY

0004r

2 (GeV/c)2Q-210 -110 1 10

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

= 10 GeVWCOMPASS PRELIMINARY = 55/80 GeVWZEUS = 70 GeVWH1 = 18 GeVWE665

0004r

2002 data (only)


COMPASS

4 OTTOBRE per SPIN2004

NUOVI RISULTATI


COMPASS

Bressan A Results from COMPASS experiment (invited talk)

Schill C Measurement of the gluon polarisation ∆G/G at the COMPASS experiment.

Peshekhonov D Inclusive spin-dependent asymmetry A1(x,Q2).

Pagano P Measurements of Collins and Sivers asymmetries at COMPASS.

Joosten R Tranversity signals in two pion correlation at COMPASS

Ferrero A Spin observables in the µ N → µ' Λ X and µ N → µ' antiΛ X reactions at COMAPSS.

Alexakhin V Longitudinal polarization of Lambda and antiLambda hyperons in deep-inelastic scattering at COMPASS.

Friedrich J Transverse Lambda polarisation at COMPASS.

Neyret D Results on exclusive ρ0 production from COMPASS at CERN

Gautheron F The COMPASS polarized target.

Koivuniemi J Polarization build up in the large COMPASS 6LiD target


COMPASSPUBBLICAZIONI


COMPASSPRESENTAZIONI A CONFERENZE (INFN)

- F. Bradamante, 2004 Int'l conference on Quarks and Nuclear Physics(QNP2004), Bloomington, USA, May 23-28 2004, Plenary invited talk:"First Physics from COMPASS"

- F. Bradamante, Advanced Studies Institute "Symmetries and Spin"(SPIN-PRAHA-2004), Prague, Czech Republic, July 5-10, 2004,invited talk:”The COMPASS experiment at CERN”

- F. Bradamante: International School of Nuclear Physics - 26th CourseErice, 16-24 September 2004"Highlights from the COMPASS experiment at CERN"

- M. Colantoni: COMPASS Workshop on "Hadron Structure and Spectroscopy",Paris, March 1-5 2004:”Pion polarizabilities and diffractive scattering @ Compass”

- M. Colantoni: Advanced Studies Institute "Symmetries and Spin"(SPIN-PRAHA-2004), Prague, Czech Republic, July 5-10, 2004:”Measurement of electric and magnetic polarizabilities withPrimakoff reaction @ COMPASS spectrometer”

- A. Ferrero: BORMIO 2004, XLII International Winter Meeting onNuclear Physics, Bormio, January 25 - February 1 2004:^ÓLambda polarization @ COMPASS^Ô

- A. Ferrero: Advanced Studies Institute "Symmetries and Spin"(SPIN-PRAHA-2004), Prague, Czech Republic, July 5-10, 2004:”Soft hadronic interactions in the COMPASS experiment”


COMPASSPRESENTAZIONI A CONFERENZE (INFN)

(cont.)- A. Martin: COMPASS Workshop on "Hadron Structure and Spectroscopy",

Paris, March 1-5 2004:"Measurement of Transversity at COMPASS"

- A. Martin: SIF, Brescia, Settembre 2004”“Misura della trasversalita’ al CERN e a RHIC”

- A. Mielech: INPC 2004, Goteborg, Sweden, June 27 - July 3“Determination of the gluon polarisation in COMPASS”

Conferenze future:

- A. Bressan: SPIN2004, Plenary invited talk,"Physics results from COMPASS"

- A. Ferrero: SPIN2004"Lambda polarization @ COMPASS"

- A. Kotzinian: SPIN2004"Sivers effect in the target fragmentation region of SIDIS"

- P. Pagano: SPIN2004"Measurements of Collins and Sivers asymmetries at COMPASS"

- F. Tessarotto: RICH2004- ....


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