COMPASS:
STATO DELL'ESPERIMENTO
E DELL’ANALISI
F. Bradamante
• SITUAZIONE GENERALE
• RUN 2004
• PROGETTI PER IL 2006
• STATO ANALISI
CSN1 21/9/2004
CSN1
Assisi
21/9/2004
F. Bradamante
SITUAZIONE GENERALE
Minute del SPSC e del RB
SPSC - 27 aprile
The 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.
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SITUAZIONE GENERALE
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SITUAZIONE GENERALE
Preparazione 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
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RUN 2004
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RUN 2004
Nuovo 2004:




GEM-11
BMS-6
W45 (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 :


R/O Errors :

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Straws, PDs, MMs
MTV err, evb crashes,
Hotlink conn, Richcntr,
etc…
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RUN 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 SM2
 Reason : Cooling water hose broken
 Action 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 BA82
Action taken : Processor reset. Report written.
Gas alarm
 Reason : malfunction of the SDC mobile flammable gas
detector (air pump)
 Action taken : detector to be replaced with a standard one.
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RUN 2004 - Silicon cold station
Reason: Detectors cracked
during cool down
Actions taken in Munich:



Slower cool down
Improved ELMB monitoring
Many tests at Munich
Plans




Will arrive mid-September
Get cold System operational
at CERN in September
Setup of cold system in beam
in October
Use Water filter from
Cryogroup
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RUN 2004
120%
100%
SPS septum
SPS septum
SM2 H2O leak & poln loss
poln loss
Scrubbing&25ns
80%
SPS Eff.
60%
COMPASS Eff.
40%
20%
½ intensity
P1A
19.5.
28.5.
P1B
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.
0%
P1A
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P1B
P1C
P2A
P2B
P2C
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RUN 2004 - statistica
Longitudinal 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- runs
760 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 …
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RUN 2004 - run adronico
Da fascio m a fascio adroni
Date : Oct.4, 8am – Oct.19, 4pm.
Activities in the hall

Removal of the solenoid and the DR


Installation of hadron run detectors


Cedars, Veto Box, Primakoff hodo, Beam killers,
Installation of cold silicon stations


Removal of 3He/4He, Warm-up, El. Cables, Pipes, Target material
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,
ECAL2 – calibration to be done
RICH – first tests with hadrons
RICH – test of the APV read-out
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with 25 ns beam
with e- beam
hadron beam
C4F10 required
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RUN 2004 - run adronico
SCHEDULA SPS
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RUN 2004 - run adronico
Planning
Day
Mon Tue Wed Thu
Fri
Sat Sun Mon Tue Wed Thu
Date
10/4
10/8
10/9 10/10 10/11 10/12 10/13 10/14 10/15 10/16 10/17 10/18 10/19 10/20 10/21 10/22 10/23 10/24 10/25 10/26
Beam
10/5
10/6
10/7
25ns --- 25ns --- 25ns--- 25ns --- 25ns
Fri
Sat Sun Mon Tue Wed Thu
158GeV --- 158GeV --- 158GeV
Beam
Fri
Sat Sun Mon Tue
M2 Beam
Polarized Target removal
Pol Target
Silicon installation and tests
Silicons
Hadron det.
-----------
Detector installation
-------------
Calib
Calibra
t
Install Tests
Cedars
RICH
RICH
ECAL cal.
RICH
C4F10 removal
e-
SPIN 2004



Due settimane per tutte le operazioni
Schedula stretta
14 giorni in totale per fisica adronica
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PROGETTI PER IL 2006
Possibili opzioni di run:
• adronico (Primakoff / central production)
• muoni protone (NH3)
• muoni deutone (6LiD)
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PROGETTI PER L’UPGRADE DELLO
SPETTROMETRO - dal 2006
Dai meeting del TB
New PTM
 D. Panzieri
Rich Wall
Torino, Dubna
ECAL1 and ECAL2: completition
Protvino
RICH1 : proposal for MAPMT read-out
Trieste, Torino
RICH1 : proposal for APV-based R/O
TUM, Saclay, Trieste (supp. log.)
Large size Drift Chamber
Saclay
SciFi: additional station
Warsaw
Si: new cold station
Munich (TUM)
 S. Dalla Torre
DAQ upgrade
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MAGNETE COMPASS
dicembre 2003:
firmato il MoU
CERN/DAPNIA/COMPASS:
finalizzazione della strumentazione
test completi
2004:
consegna a Saclay
test di vuoto, raffreddamento, campo
massimo, omogeneita’,…
consegna al CERN
2005:
installazione, tests, magnetic measurements, polarization
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MAGNETE COMPASS - 2
Accordo tra
OD/COMPASS/CEA
finalizzato
Piani per test comuni
OD/CEA a Saclay pronti
Trasporto a Saclay:
~ fine settembre
Test conclusi:
solenoide + dipolo + coils
completamente assemblati
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~ 5 settimane dopo
l’arrivo a Saclay
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ECAL1 e ECAL2
OLG
A
GAMS
ECAL1




LxH
Hole
OLGA
GAMS
: 3.97 x 2.86 m2
: 1.07 x 0.61 m2
: 143 x 143 mm2
: 38.2 x 38.2 mm2
28
2.86 20
75
16
8
44
3.97
ECAL2





GAMS
LxH
Hole
GAMS
Mainz
P/S
: 4.40 x 1.97 m2
: 38.2 x 38.2 cm2
: 38.2 x 38.2 mm2
: 75 x 75 mm2
: 38.2 x 38.2 mm2
Mainz
36
P/S
1.97 26
12
24
52
68
4.40
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ECAL: produzione centrale
From Donskov, Fut. Phys@compass, 2002
ECAL1
WAD
Decadimento ηη -> 4γ
D
i
s
t
a
n
c
e
ECAL1
GAMS
ECAL2
Acc
16 m
34 m
-
0.18
11 m
-
34 m
0.36
Desiderabile aumentare
l’accettanza per  con un
“Wide Angle Electromagnetic
Calorimeter” prima di SM1
(Acc ~ 0.95)
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ECAL: DG
2006
180 mrad
2003
39 mrad
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D 0 *  D 0 + π0
(simile a D±*  D0 + π± )
selezionando π0  2γ in ECAL
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Large 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
DC1 DC2
Straws
Lay-out previsto
~ 200mrd
PTM COMPASS

Mecanica OK

Electronica: da decidere …

Planning : 2006 possibile
DC4
Lay-out 2002
dopo SM2
.....
PTM SMC
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DCs: 3
Straws: 1
1/2
2x1/2
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Upgrade DAQ - per 2006
Hardware consolidation



Replace many ROBs and EVBs
Exchange old S-links, etc.
Infrastructure,…
Bandwidth upgrade :
goal is to reach 100 MB/network link


I/O software
Network components
Filter farm



Aim : reduce hadron run data by
an order of magnitude
Speed : 100-200 ms/event
Proposed : Blade-server rack with
300 CPUs.
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Software



DAQ software upgrades
Filter upgrades
Online software
improvements
Resources needed


DAQ consolidation and
Network : 335 kSF
Filter farm : 720 kSF
Manpower

TMU not enough: help req
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RICH1 maPMT
PRINCIPLE
photon detectors in the central
region : maPMT
(HAMAMATSU R7600-M16-03)
~ 600 maPMT
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cathode replaced by
a maPMT panel
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RICH1: APV read-out
Partendo dall’idea di A. Colavita:
Configurare il chip APV per leggere il
RICH
Parametri APV modificabili
Segnale campionato tre volte
Expected time resol : ~100 ns
Catena R/O:
APV  SGADC  Gesica
Stato
Carte prototipo pronte
Tests in EHN2 a fine luglio
Test da continuare settembre/ottobre
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STATO ANALISI
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ANALISI - ISTITUTI
Freiburg
17 kSi2k
GridKa
45 kSi2k
TUM
26 kSi2k
CERN
production site!
120 kSi2k
Dubna & Protvino
43 kSi2k
Saclay/Lyon
(27 kSi2k)
Torino
28 kSi2k
Trieste
45 kSi2k
1 Pentium IV 3GHz ~ 1 kSi2k
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PRIMI RISULTATI DI FISICA (run 2002)
presentati a Parigi, a DIS04, …
• A 1d
• high pT
• Collins asymmetry
ma ovviamente molto lavoro anche sugli altri canali:
• DG/G da open charm
• produzione di L con PT longitudinale e trasversa
• Dq
• produzione di r e f
• asimmetria di Chan
• ricerca di pentaquark (S , q+)
e sui dati 2003 e 2004
--
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attivita’ di analisi 2004 / 2005
COMPASS TORINO
Le 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 TRIESTE




finalizzazione 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 Erlangen
sviluppo/mantenimento software generale
software RICH
Primi test (indipendenti) di tools Grid:
Torino: uso hardware per produzione MC
Trieste: uso Alien per “catalogo”/accesso dati MC
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DG/G: OPEN CHARM - SIGNAL & FoM
¾·2002 (25 “days”)
1 week(30) 2004 (5 “days”)
FoM(*) ~ 120
FoM ~ 112
(*)FoM=S/(1+B/S)
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FoM2004 ~ 4.5 · FoM2002
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OPEN CHARM
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HIGH pt
High-pt Analysis
Sonja Hedicke, Universität Freiburg,
Analysis Meeting, CERN, August 2004
•Data Selection
•Xcheck on 2003 data
•Q2 > 1 GeV2 asymmetries
with some systematics
•2002 data vs MC
•Gluon kinematics
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m
m'


P
g
q
q
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HIGH pt
Consecutive and global configuration
md hh
ALL
1
 A *d 
D
2 PT fDPB
A *d
Nu
Nd

w

wi
1  i

i
i


Nu
Nd
2
2
2 PT   wi   wi
i
 i
Targetpolarisation PT ≈ 0.5
Strahlpolarisation PB ≈ 0.8
Dilutionfaktor f ≈ 0.4
Depolarisationsfaktor D ≈ 0.6
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 N u  N d N u'  N d' 
N  N  N'  N' 
d
u
d 
 u
events

w

w

i
i
i
i
, with w  fDPB
'
'
Nu
N
d
2
2
w

w

i
i
i
i



N u'
N d'
without Q2 cut
Q2 > 1 GeV2
2002
111953
6823
2003
255313
22470
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HIGH pt
PGF and Background
PGF
DIS L.O.
QCDCompton
resolved
Photon
at low Q2
need agreement between data and MC to entangle the contributions
of the different subprocesses  MC studies, comparison with 2002 data
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HIGH pt
First ALL measurement from
p + p  p0 + X, h ~ 0
ALL ~
DG
DG

G
G
pQCD NLO predictions
based on GRSV
polarized PDFs
scale uncertainty of 65%
’03 data
not included
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negative ALL difficult to
accommodate in the
framework of pQCD !
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HIGH pt
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DG/G
CON TUTTI I DATI DEUTERIO 2002-2004
LE PREVISIONI SONO
s(DG/G) = 0.24 da open charm
s(DG/G) = 0.05 da high pT all Q2
s(DG/G) = 0.16 da high pT Q2>1
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resolved 
ssyst ?
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PRODUZIONE ESCLUSIVA ρ e f
|t ’| < 0.5 GeV2
7.5 < W < 16 GeV
Q2 > 10-3GeV2
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PRODUZIONE ESCLUSIVA ρ e f
• 16 % of total 2002 statistics
• no MC corrections yet
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PRODUZIONE ESCLUSIVA ρ and f
ANGULAR DISTRIBUTIONS
pT > 0.15 GeV
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Q2> 0.05 GeV2
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PRODUZIONE ESCLUSIVA DI ρ
High precision measurement
of spin density matrix element
If SCHC ->
2002 data (only)
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NUOVI RISULTATI
4 OTTOBRE per SPIN2004
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Bressan A Results from COMPASS experiment (invited talk)
Schill C Measurement of the gluon polarisation ΔG/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 deepinelastic 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
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PUBBLICAZIONI
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PRESENTAZIONI 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 Course
Erice, 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 with
Primakoff reaction @ COMPASS spectrometer”
- A. Ferrero: BORMIO 2004, XLII International Winter Meeting on
Nuclear 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”
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PRESENTAZIONI 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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