1. Further Information Requested in
the Proposal (SPSC-P-330) Review Process
by the NA61/SHINE Collaboration
Progress since February 2007
Addendum-2
Addendum-2: CERN-SPSC , SPSC-P-330 (June 15, 2007)
Addendum-1: CERN-SPSC , SPSC-P-330 (January 25, 2007)
Proposal: CERN-SPSC , SPSC-P-330 (November 3, 2006)
Status Report: CERN-SPSC , SPSC-SR-010 (September 5, 2006)
LoI: CERN-SPSC , SPSC-I-235 (January 6, 2006)
EoI: CERN-SPSC , SPSC-EOI-001 (November 21, 2003)
M. Gazdzicki, Frankfurt, Kielce

2. The NA61/SHINE Collaboration:
118 physicists from 25 institutes and 15 countries:
University of Athens, Athens, Greece
University of Bari and INFN, Bari, Italy
University of Bergen, Bergen, Norway
University of Bern, Bern, Switzerland
KFKI IPNP, Budapest, Hungary
Cape Town University, Cape Town, South Africa
Jagellionian University, Cracow, Poland
Joint Institute for Nuclear Research, Dubna, Russia
Fachhochschule Frankfurt, Frankfurt, Germany
University of Frankfurt, Frankfurt, Germany
University of Geneva, Geneva, Switzerland
Forschungszentrum Karlsruhe, Karlsruhe, Germany
Swietokrzyska Academy, Kielce, Poland
Institute for Nuclear Research, Moscow, Russia
LPNHE, Universites de Paris VI et VII, Paris, France
Pusan National University, Pusan, Republic of Korea
Faculty of Physics, University of Sofia, Sofia, Bulgaria
St. Petersburg State University, St. Petersburg, Russia
State University of New York, Stony Brook, USA
KEK, Tsukuba, Japan
Soltan Institute for Nuclear Studies, Warsaw, Poland
Warsaw University of Technology, Warsaw, Poland
University of Warsaw, Warsaw, Poland
Rudjer Boskovic Institute, Zagreb, Croatia
ETH Zurich, Zurich, Switzerland
NA61/SHINE

3. Physics of strongly interacting matter
Physics goals (I):
Physics of strongly interacting matter
Discovery potential:
quark-gluon plasma
Search for the critical point of
strongly interacting matter
Precision measurements:
transition
Study the properties of the onset of deconfinement in nucleus-nucleus collisions
Measure hadron production
at high transverse momenta
in p+p and p+Pb collisions as
reference for Pb+Pb results
hadron gas

4. Data for neutrino and cosmic ray experiments
Physics goals (II):
Data for neutrino and cosmic ray experiments
Precision measurements:
Super-Kamiokande
Measure hadron production
in the T2K target needed for
the T2K (neutrino) physics
Measure hadron production
in p+C interactions needed
for T2K and cosmic-ray,
Pierre Auger Observatory
and KASCADE, experiments
Extensive air shower

5. Progress since February 2007
(the presentation of the proposal at the SPSC)
- a 30-day long pilot proton run in 2007 was recommended
by the SPSC, approved by the RB and scheduled in October 2007
Thank you very much !!!
- the new experiment was given the CERN number: NA61
the NA61 collaboration selected a nickname: SHINE
(Sps Heavy Ion and Neutrino Experiment)
- first dedicated NA61 grants are approved, in particular:
-Polish groups: about 200k CHF,
-Swiss groups: about 50k CHF (150k CHF approval pending)
- preparations of the 2007 run are progressing well, in particular:
-the NA49/61 software/analysis/simulation school
took place in May in Frankfurt,
-weekly detector and software audio meetings are organized,
-design and construction of the forward TOF detector is in progress,
-construction of the PSD super-module is in progress,
-tests of the electronics for the TPC read-out upgrade are performed,
-a 4-day long test run was preformed in June 7-11
- intense discussions with the SPSC referees on the program
led to the formulation of the addendum-2 to the proposal

6. The June test of the proton beam at 30 GeV and
the Beam Position Detectors
The secondary positively charged hadron beam at 30 GeV contains
about 30% protons.
About 5000 protons per spill were measured, this number can be still
increased, but it is already large enough for the 2007 run.
The NA49 BPDs were tested using different Ar/C02 mixtures and HV settings.
The detector repaired in Krakow showed good performance, the other two
detectors will be refurbished before the October run

7. Detailed information concerning:
Addendum-2
Detailed information concerning:
- tasks, responsibilities and manpower
run: data calibration and analysis
- strategy concerning software and IT resources
(the IT estimate of computing requirements and costs for NA61)
- experimental uncertainties in the search for the critical point
- strategy of data taking with ions
- additional justification for neutrino running
- further justification of runs for the cosmic-ray experiments
- updated beam request

8. tasks, responsibilities and manpower
NA49 experts are indicated in italic
The fraction of time devoted to NA61 is indicated in square brackets

9. tasks, responsibilities and manpower

10. 2007 run: data calibration and analysis
The calibration procedure of NA61 will be based on the
procedure developed and used for many year by NA49.
It consists of 9 sequential steps resulting in optimized parameters for:
- detector geometry and drift velocity,
- magnetic field,
- residual distortion correction,
- specific energy loss,
- time of flight
and parametrization of:
- position errors of TPC points
- maximum number of TPC points on track
The calibration will be done by NA49 experts or under their supervision.
The total time of the calibration procedure is estimated to be 5 months.
Thus the physics analysis will start in spring 2008 and preliminary
results are expected in fall 2008.

11. strategy concerning software and IT resources
(the IT estimate of computing requirements and costs for NA61)
NA61 will use the NA49 software for at least the 2-3 first years of running.
Conversion of the software to the SLC4 LINUX is completed, this guarantees
a stable software during the next years.
The raw data will be stored and reconstructed using CERN IT resources.
The final physics analysis based on the ROOT mini-DSTs will be done
on clusters in the participating institutes:

12. strategy concerning software and IT resources
(the IT estimate of computing requirements and costs for NA61)
The cost of the CERN IT resources will be
payed by the participating groups

13. experimental uncertainties in the search for the critical point
The multiplicity and transverse momentum fluctuations are predicted
(Phys. Rev. D60, (1999)) to increase (∆  0.1 and ∆PT  10 MeV/c)
in the vicinity of the critical point. This prediction is used to study
the experimental resolution of NA61 in the search for the critical point.
The following uncertainties were quantified (simulations and/or NA49 data):
- statistical errors,
- systematic error due to variation of the background fluctuations,
- systematic error due to the uncertainty in the measurement of the
number of projectile spectators,
- systematic error due to reconstruction efficiency and the small
contribution of non-vertex tracks.
An example: ''background'' fluctuations in the UrQMD model
+ CP signal in S+S at 80A GeV

14. experimental uncertainties in the search for the critical point

15. strategy of data taking with ions
Conclusions:
The proposed (collision energy)-(system size) scan with ion
beams is necessary for a conclusive and comprehensive
results on the critical point and onset of deconfinement.
The original suggested sequence of data taking can be, however,
optimized in order to increase the probability to observe
indications of the new physics in the shortest time.
Taking this into account we propose to start ion data taking in 2009
with S+S interactions and continue with In+In (2010) and C+C (2011)

16. S+S collisions are optimal
strategy of data taking with ions
Arguments:
S+S
Pb+Pb
Relative yield of strange hadrons is
independent of the system size starting
from central S+S collisions
Simple thermodynamical models can be
used already for central S+S collisions
Simple thermodynamical models can be
used already for central S+S collisions
Large systems (A > 30) are preferred
158A GeV
S+S
Pb+Pb
Freeze-out temperature decreases
with increasing system size.
158A GeV
Small systems freeze-out close to
the transition line
Small systems are preferred
S+S collisions are optimal

17. E E additional justification for neutrino running
Detailed study of the requirements concerning NA61-T2K data
The T2K physics goals require measurement of the far/near ratio
with a precision better than 3%.
Without NA61 uncertainty is at least 20% (based on MC studies).
Example:
MARS/G-FLUKA
FLUKA/G-FLUKA E E
ratio of far/near ratios

18. additional justification for neutrino running
Requirements concerning the NA61 measurements:
Statistical accuracy -> M interactions per reaction
Systematic error > < 3% for pions and < 10% for kaons
NA49 reached this performance
Reactions: p+C and p+(T2K target) at 30, 40 and 50 GeV
(optional p+(10cm target) at 30, 40 and 50 GeV)
Acceptance:

19. additional justification for neutrino running
Construction of the forward TOF:
NA49
NA61

20. further justification of runs for the cosmic-ray experiments
The cosmic-ray physics goals require a prediction of the number
of pions in hadronic showers with less than 5% systematic error
Without NA61 uncertainty is at least 20% (based on MC studies).

21. further justification of runs for the cosmic-ray experiments
Requirements concerning the NA61 measurements:
Statistical accuracy -> 1M interactions per reaction
Systematic error > < 5% for pions and kaons
NA49 reached this performance
Reactions: ''T2K data'' on p+C at 30, 40 and 50 GeV
pion + C at 158 and 350 GeV

22. The proposed sequence of runs assumes the production of
updated beam request
The proposed sequence of runs assumes the production of
the detector upgrades (1M CHF) to start by the end of 2007.

23. Additional slides

24. may lead to discovery of the critical
point of strongly interacting matter by
an observation of a hill of fluctuations in
two dimensional plane (energy)-(system size)
or equivalently
(temperature)-(baryo-chemical potential)
New data registered
by NA49-future
158A
10A GeV
In+In
S+S
p+p
C+C
p+p
In+In
energy (A GeV)
In particular the critical point should lead to an increase
of multiplicity and transverse momentum fluctuations
Fluctuations and CP: Stephanov, Rajagopal, Shuryak, Phys. Rev. D 60,
Freeze-out points: Becattini et al., Phys. Rev. C 73,

25. NT LHC SPS SIS RHIC RHIC-SP Onset of deconfinement Search for the
critical point
LHC
SPS NT
SIS
RHIC
RHIC-SP

26. ? will allow to establish the system size New data registered
dependence of the anomalies observed
in Pb+Pb collisions and thus further test
their interpretation as due to the onset of
deconfinement
New data registered
by NA49-future
In+In ?
S+S
C+C
p+p
energy (A GeV)
energy (A GeV)
In particular, it is expected that the ''horn'' like structure
should be the same for S+S and Pb+Pb collisions and then
rapidly disappear for smaller systems

27. NA49 and other CERN SPS experiments
measured high pT spectra in central
Pb+Pb collisions up to 4.5 GeV/c
NA49 at 158A GeV
charged pions
E. Beier et al., Phys. Rev. D18, 2235 (1978)
NA49
p+Pb
central
Pb+Pb
p+p
ion
SPS
counts/(GeV/c)
NA49-future
The pT spectra in p+p and p+Pb interactions at the
ion SPS energies are measured only up to 2.5 GeV/c
NA49-future intends to measure the missing high pT spectra in p+p
and p+Pb interactions. Study of the high pT correlations and centrality
dependence will be also possible.