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M. Gazdzicki, Frankfurt, Kielce

Further Information Requested inthe Proposal (SPSC-P-330) Review Process

Progress since February 2007Addendum-2

by the NA61/SHINE Collaboration

Addendum-2: CERN-SPSC-2007-019, SPSC-P-330 (June 15, 2007)Addendum-1: CERN-SPSC-2007-004, SPSC-P-330 (January 25, 2007)Proposal: CERN-SPSC-2006-034, SPSC-P-330 (November 3, 2006)Status Report: CERN-SPSC-2006-023, SPSC-SR-010 (September 5, 2006) LoI: CERN-SPSC-2006-001, SPSC-I-235 (January 6, 2006)EoI: CERN-SPSC-2003-031, SPSC-EOI-001 (November 21, 2003)

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The NA61/SHINE Collaboration:118 physicists from 25 institutes and 15 countries:

University of Athens, Athens, GreeceUniversity of Bari and INFN, Bari, ItalyUniversity of Bergen, Bergen, NorwayUniversity of Bern, Bern, Switzerland KFKI IPNP, Budapest, HungaryCape Town University, Cape Town, South AfricaJagellionian University, Cracow, PolandJoint Institute for Nuclear Research, Dubna, RussiaFachhochschule Frankfurt, Frankfurt, GermanyUniversity of Frankfurt, Frankfurt, GermanyUniversity of Geneva, Geneva, SwitzerlandForschungszentrum Karlsruhe, Karlsruhe, GermanySwietokrzyska Academy, Kielce, PolandInstitute for Nuclear Research, Moscow, RussiaLPNHE, Universites de Paris VI et VII, Paris, FrancePusan National University, Pusan, Republic of KoreaFaculty of Physics, University of Sofia, Sofia, BulgariaSt. Petersburg State University, St. Petersburg, RussiaState University of New York, Stony Brook, USAKEK, Tsukuba, JapanSoltan Institute for Nuclear Studies, Warsaw, Poland Warsaw University of Technology, Warsaw, PolandUniversity of Warsaw, Warsaw, PolandRudjer Boskovic Institute, Zagreb, CroatiaETH Zurich, Zurich, Switzerland NA61/SHINE

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Physics goals (I):

transition

Search for the critical point of strongly interacting matter

Study the properties of the onset of deconfinement in nucleus-nucleus collisions

Physics of strongly interacting matter

Measure hadron productionat high transverse momentain p+p and p+Pb collisions asreference for Pb+Pb results

Precision measurements:

Discovery potential: quark-gluon plasma

hadron gas

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Physics goals (II):

Data for neutrino and cosmic ray experiments

Measure hadron productionin 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

Precision measurements: Super-Kamiokande

Extensive air shower

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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

- 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 2008-2011 program led to the formulation of the addendum-2 to the proposal

Thank you very much !!!

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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

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Addendum-2

Detailed information concerning:- tasks, responsibilities and manpower

- 2007 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

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tasks, responsibilities and manpower

NA49 experts are indicated in italicThe fraction of time devoted to NA61 is indicated in square brackets

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tasks, responsibilities and manpower

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2007 run: data calibration and analysisThe calibration procedure of NA61 will be based on theprocedure 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 preliminaryresults are expected in fall 2008.

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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 guaranteesa 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 doneon clusters in the participating institutes:

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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

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experimental uncertainties in the search for the critical point

The multiplicity and transverse momentum fluctuations are predicted (Phys. Rev. D60, 114028 (1999)) to increase (∆ 0.1 and ∆PT eV/c)in the vicinity of the critical point. This prediction is used to studythe 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

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experimental uncertainties in the search for the critical point

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strategy of data taking with ions

The proposed (collision energy)-(system size) scan with ionbeams is necessary for a conclusive and comprehensiveresults 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)

Conclusions:

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strategy of data taking with ionsArguments:

Relative yield of strange hadrons isindependent of the system size starting

from central S+S collisions

Freeze-out temperature decreases with increasing system size.

158A GeV

S+S Pb+Pb

Simple thermodynamical models can beused already for central S+S collisions

Small systems freeze-out close tothe transition line

S+S Pb+Pb

158A GeV

Large systems (A > 30) are preferred

Simple thermodynamical models can beused already for central S+S collisions

Small systems are preferredS+S collisions are optimal

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The T2K physics goals require measurement of the far/near ratiowith a precision better than 3%.

Without NA61 uncertainty is at least 20% (based on MC studies).Example:

rati

o of

far/

near

rat

ios

E E

MARS/G-FLUKA FLUKA/G-FLUKA

additional justification for neutrino runningDetailed study of the requirements concerning NA61-T2K data

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additional justification for neutrino runningRequirements concerning the NA61 measurements:Statistical accuracy -> 1-1.5M interactions per reactionSystematic error -> < 3% for pions and < 10% for kaons

Acceptance:

Reactions: p+C and p+(T2K target) at 30, 40 and 50 GeV (optional p+(10cm target) at 30, 40 and 50 GeV)

NA49 reached this performance

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additional justification for neutrino runningConstruction of the forward TOF:

NA49 NA61

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further justification of runs for the cosmic-ray experiments

The cosmic-ray physics goals require a prediction of the numberof pions in hadronic showers with less than 5% systematic error

Without NA61 uncertainty is at least 20% (based on MC studies).

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further justification of runs for the cosmic-ray experimentsRequirements concerning the NA61 measurements:

Statistical accuracy -> 1M interactions per reactionSystematic error -> < 5% for pions and kaons

Reactions: ''T2K data'' on p+C at 30, 40 and 50 GeV pion + C at 158 and 350 GeV

NA49 reached this performance

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updated beam request

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

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Additional slides

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10 20 30 40 80 158

energy (A GeV)

In+In

C+C S+S

New data registered by NA49-future

p+p

may lead to discovery of the criticalpoint 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)

Fluctuations and CP: Stephanov, Rajagopal, Shuryak, Phys. Rev. D 60, 114028 Freeze-out points: Becattini et al., Phys. Rev. C 73, 044905

p+p

In+In

158A 10A GeV

In particular the critical point should lead to an increase of multiplicity and transverse momentum fluctuations

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RHIC SISSPS

Search for the critical point

LHC NT

RHIC-SP

Onset of deconfinement

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10 20 30 40 80 158

energy (A GeV)

In+In

C+C S+S

New data registered by NA49-future

p+p

will allow to establish the system size dependence of the anomalies observed in Pb+Pb collisions and thus further test

their interpretation as due to the onset ofdeconfinement

10 20 30 40 80 158

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 thenrapidly disappear for smaller systems

?

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NA49 and other CERN SPS experiments measured high pT spectra in central

Pb+Pb collisions up to 4.5 GeV/c

NA49-future intends to measure the missing high pT spectra in p+pand p+Pb interactions. Study of the high pT correlations and centrality

dependence will be also possible.

NA49

ionSPS

The pT spectra in p+p and p+Pb interactions at the ion SPS energies are measured only up to 2.5 GeV/c

E. Beier et al., Phys. Rev. D18, 2235 (1978)

NA49-future

p+p

p+PbcentralPb+Pb

coun

ts/(

GeV

/c)

NA49 at 158A GeV

charged pions

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