Jan P. NassalskiRECFA, Warsaw, 25.02.20051 Polish participation in fixed target experiments at CERN (1999-2004) NA48 & NA48.1 running NA49 NA59 (COMPASS)

Jan P. Nassalski RECFA, Warsaw, 25.02.2005 1

Polish participation in fixed target experiments

at CERN (1999-2004)

NA48 & NA48.1 running NA49 NA59 (COMPASS) NA47 (SMC) running WA98 completed

J.P.Nassalski25.02.2005RECFA, Warsaw


Sources of funds

Budget of Institutes: - salaries of physicists and PhD students, - all overheads: electricity, heating, phones, faxes… (ex.: average for SINS: 42kzł (10.4kЄ) /year / <person>) It will be not accounted for in experimental budgets.

Funds for „Special Projects and Equipment” (SPUB) from the fundning agency (KBN): - building detectors, - contributions to Common Funds, - travel, - local infrastructure (computers, …), - supplements to salaries.


Grants from KBN (typically 100kzł /year in total): - can not be used for Common Funds, - used to supplement SPUB for specific items, - there are special grants to support PhD students and young researchers.

Funds from bilateral agreements (PL-D, PL-F, …): used for the exchange of physicists between collaborating Institutes.

Funds from EU.


NA48


Soltan Institute for Nuclear Studies:

High Energy Physics Department, Department of Nuclear Detectors and Electronics

Institution

Participants 4 physicists 2 electronics engineers 1 PhD student 1 diploma student

only 1 physicist continued in NA48.1


Year: 1999 2000 2001 2002

kzł:

(1Є=4zł)

53 113 165 145+32a

40% common funds, 24% travel, 17% overheads, 13% salaries, 5% equipment, …

In addition: 1 PhD grant of 23kzł.

a) Common fund for NA48.1

Budget for experiment(does not include personnel costs covered by Institutes)


Hardware responsabilities

Design, making a prototype, testing after production and maintenance of:

60 modules of Fastbus Clock Fanout, 65 modules of Fastbus Optoisolated Cluster Interconnect, 30 modules of VME FOL-RIO Interface.


Contributions to physics analysis Parallel analysis for:• search for light gluino,• 1 PhD,• KS lifetime,•

Contributions to systematics:• 1 diploma,

η and K0 mass.Re(ε /ε) :

+ - + -L,SK π π e e :

± 0L e eK π π e ν (ν ).


Highlights World data on ε /ε

COMBINED RESULT FROM ALL EXPERIMENTS:

εε’/’/εε = (16.6 = (16.6 ±± 1.6) 1.6) ·· 10 10-4-4


K0, η masses and K0 lifetime

s

10K ππτ (0.89598 0.00048 0.00051) 10 s

In 2002:

• higher precision than that of PDG2000 and 1.7σ above it,

•

consistent with PDG2000 and with a similar error,

•

2.4 times higher precision than that of PDG2000 and it differs from it by 4.2σ.

0 0LM(K 3π ) 497.625 0.031 MeV

0M(η 3π ) 547.843 0.051 MeV


0 ± 0L e eK π π e ν (ν )


Event display:~1200 charged particles

NA49Large Acceptance Hadron Spectrometer for the study

of Heavy Ion Collisions


Institutions

Soltan Institute for Nuclear Studies (SINS), High Energy Physics Department, Warsaw,

Warsaw University (WU), Institute of Experimental Physics,

Institute of Nuclear Physics, Polish Academy of Science (INP), Kraków,

Świętokrzyska Academy (SA), Kielce (since April 2002).


Participants (2005)

Institution Physicists PhD students

Diploma students

SINS 2

1

WU 1 1

INP 3 1

SA 5

2 2

Total 11 5 2

10 students obtained diploma in 1998-2005



Year:

Institute:

1999 2000 2001 2002 2003 2004

(SINS+

WU+INP)a 51 43 81 201 193 120

SAb - - - 190

In addition:a) 3000Є from PL-D b) 75kЄ from Helmholtz Gemeinschaft (2004-2006)

30% travel, 27% salaries, 16% equipment, 16% overheads, …

kzł

kzł


Main results

First beam 1996, last 2002, analysis goes on.

Main goal: search for QGP in HI collisions

Main results (whole collaboration):• Strangeness enhancement in central Pb-Pb

collisions,• Collective behaviour (HBT, flow),• Non-monotonic energy dependence of

strangeness production.


Main results of Cracow & Warsaw groups:

1) Evolution of baryon stopping from

p-p to p-Pb to Pb-Pb,

2) Non-statistical fluctuations in pt,

3) Nuclear modification factor in p-Pb.


Evolution of net baryon number:


Nuclear modification factor in p-Pb

pApA

pp bin

σR =

σ <N >


Kielce group in NA49 collaboration

The group was involved in collecting the data at the SPS and now it participates in the data analysis. It is responsible for the magnetic field calibration via K0 mass reconstruction and the recalibration of the Veto calorimeter. The group performs the analysis to determine:

• fluctuations of multiplicity & pT ;

• collective flow of hyperons;

• production of K0*.

In October 2004 the group organized the International Workshop on Future of Nuclear Collisions at High Energies.


NA58COMMON MUON and PROTON APPARATUS for STRUCTURE and SPECTROSCOPY


Soltan Institute for Nuclear Studies (SINS), High Energy Physics Department,

Warsaw University (WU), Institute of Experimental Physics,

Warsaw University of Technology (WUT), Institute of Radioelectronics.

Institutions


Institution Physicists/Engineers

PhD students

Diploma students

SINS 5

3 1

WU 1 2 1

WUT 2 3

Total 8

8 2

Participants (2005)

One PhD student from SINS graduated in 2004 andleft COMPASS.


Year:

Institute:

1999 2000 2001 2002 2003 2004

SINS+WU 385 359 518 505 359 649

WTU 197 212 127 150 - 127

32% travel, 22% common funds, 19% overheads, 16% salaries, 6% equipment, …

In addition: 2 PhD grants, 50kzł in total, „Polonium”, Saclay-SINS, 1.7kЄ for travel in 2004.


kzł

kzł

180kzł shared between COMPASS and SMC.


Contributions to hardware

Construction of an additional SciFi detector to be used for tracking in the beam region (from 2006).

Contributions to general purpose software

Alternative algorithm of track reconstruction, Alignment of data taken in 2002 – 2004, Implementation of additional scintillator hodoscopes

used to determine beam momentum, Radiative corrections and dilution factor.


Physics program of COMPASS(as in the Proposal)

Nucleon spin structure, using muon beam:

Gluon polarisation ΔG(x)/G(x), Quark polarisation of different flavours Δq(x), Transverse spin distribution function ΔTq(x), Spin-dependent fragmentation function ΔDq

Λ..

Hadron spectroscopy, using hadron beams:

Primakoff reactions, Polarisability of π and K, Glueballs and hybrids, Semileptonic decays of charmed hadrons, Double-charmed barions.


Contributions to physics analysis

ΔG(x)/G(x) from events with hadron pairs at large pt,

ΔG(x)/G(x) from events with D*,

Search for Φ(1860) pentaquark (parallel analysis),

A1d at small x and Q2 (parallel analysis),

Spin matrix elements for exclusive ρ0 production (parallel analysis),

A1d for exclusive ρ0 production (parallel analysis),

A1d for identified hadrons.

Warsaw group has experience from previous CERN muon experiments:EMC NMC SMC COMPASS.


ΔG/G from large pt

ΔG/G = 0.06 ± 0.31stat. ± 0.06syst.2002/03 dataQ2 > 1 GeV2

GSA,B,C: T. Gehrmann and W. Sterling, Z. Phys. C65 (1994) 461.

<xg> = 0.13 ± 0.08


D0 signal ( ΔG)

D* D0πs (Kπ) πs


2002/03 dataQ2 > 1 GeV2

x·g1d(x)


Prospects

The only fixed target experiment considered so far for running in mid-term planning (2006-2010) at CERN.

Possible new item in the future physics program: measurements of GPD (within the EU „Hadron Physics”):

polish group contributes 73kЄ in 2004-2006 to build a prototype of recoil detector

as a joint project of Bonn, Mainz, Saclay and Warsaw.


NA47(SMC)


End of data taking: 1996.

Institutions: SINS (5 physicists + 1PhD), WU (1 + 1PhD), WUT (2 engineers),

Experimental budget in the reporting period: in 2000-2003, 180kzł shared between SMC and COMPASS,

5 publications since 1999: 3 technical + 2 on physics: 1999: A1

p,d at small x and Q2 , 2004: ΔG/G from events with hadrons at large pt. In both cases – a major role in the analysis (1 PhD from each activity).

All of physicists are now in COMPASS.


Low x trigger implemented by Warsaw group


WA98


End of data taking: 1996,

Institutions: SINS (3 physicists +1PhD), SA (1 pysicist), WUT (1 engineer); 2 PhDs*)

Experimental budget*): 200kzł.

~20 publications*).

-------------------- *) in 1999-2004


Interferometry of Direct Photons in Central 208Pb+208Pb Collisions at 158AGeV, Phys. Rev. Lett. 93(2004)022301

Two-particle correlations of direct photons were measured in central 208 Pb+ 208 Pb collisions at 158 AGeV. The invariant interferometric radii were extracted for 100 < KT < 300 MeV/c and compared to radii extracted from charged pion correlations. The yield of soft direct photons, KT < 300 MeV/c, was extracted from the correlation strength and compared to theoretical calculations.

FIG. 4: Yield of direct photons extracted from the strength of the two-photon correlation (closed circles) and by the statistical subtraction method (open circles, or arrows indicating upper limits) [6]. Total statistical plus systematical errors are shown.


One-, Two- and Three-Particle Distributions from 158A GeV/c

Central Pb+Pb Collisions, Phys. Rev C67(2003)014906


Thank you


Large CPV effect seen in ...

KL π+π-e+e- , confirming KTeV result:

AΦ = (14.2 ± 3.6)%

AΦ = (13.6 ± 2.8)%

BR = (3.08 ± 0.20) ·10-7

BR = (3.2 ± 0.7 ) ·10-7

in agreement with predictions.

... but not in KS π+π-e+e- (only NA48 data):

BR = (4.69 ± 0.30) ·10-5AΦ = (0.5 ± 4.3)%

as expected, indicating that AΦ ≠ 0 in KL is genuine effect.


Evolution of non-statistical pt fluctuations with centrality:

Documents

Jan P. NassalskiRECFA, Warsaw, 25.02.20051 Polish participation in fixed target experiments at CERN (1999-2004) NA48 & NA48.1 running NA49 NA59 (COMPASS)