NA61/SHINE overview

Seweryn Kowalskifor the NA61/SHINE Collaboration

Institute of Physics University of Silesia

Table of contents

NA61/SHINE – few facts NA61/SHINE physics program

Ion program Data for Neutrino physics Data for Cosmic-ray physics

The device Current status and plans Summary

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Ion run – see Roman Płaneta presentation on Sunday

NA61/SHINE – few facts

Successor of NA49 Located at the CERN SPS (North Area, H2 beam line) Fixed target experiment on primary (ions) and secondary

(ions, hadrons) beams Proposal November 2006, pilot run 2007, first physics run

2009 NA61 is the second largest non-LHC experiment at CERN

TPC read-out channels (181k) = 40% of ALICE TPC 139 physicists from 28 institutes and 15 countries

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NA61/SHINE PHYSICS PROGRAM

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Ion program

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critical point

1st order phase transition

2D scan (energy, system size)

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Comprehensive scan in the whole SPS energy range (13A-158A GeV) with light and intermediate mass nuclei

Study of the onset of deconfinement

Statistical Model of the Early Stage (SMES) 1st order phase transition to QGP between top AGS and top SPS energies

Constant temperature and pressure in mixed phase Number of internal degrees of freedom increases HG QGP Total entropy and total strangeness are the same before and after

hadronization (cannot decrease QGP HG) Mass of strangeness carriers decreases HG QGP (mL, K, ...> ms)

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“kink” “horn” “step”

HG

HG

QGP

HG

HG

QGPHG

QGP

mixedphase

mixedphase

Gaździcki, Gorenstein, Acta Phys. Polon. B30, 2705 (1999)

Study of the onset of deconfinement

NA49 evidence of deconfinement near 30A GeV C. Alt et al., PRC77,024903 (2008)

Horn: decrease of strangeness carrier masses Dale and Step: constant T and p in mixed

phase Hard to explain by statistical and dynamical

models that do not include phase transition between HG and QGP

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“dale”

“horn”

“step”

Study of the onset of deconfinement NA61/SHINE

Start of the 2D (energy/system size) scan of phase diagram

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2015

2014

2011/12

13 20 30 40 80 158

Xe+La

Be+Be

Ar+Ca

p+p 2009/10/11

Search for the critical point

Critical point of strongly interacting matter should be located in the SPS energy range Theoretical calculation:

TCP = 162 2 MeV B

CP = 360 40 MeV

Critical point should be searched in collisions with energy higher than energy of the onset of deconfinement (EOD ~ 30A GeV).

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Fodor, Katz, JHEP 0404, 050 (2004)Alt et al., PRC77, 024903 (2008)

Search for the critical point NA61/SHINE

Search for the hill of fluctuations

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2015

2014

2011/12

13 20 30 40 80 158

Xe+La

Be+Be

Ar+Ca

p+p 2009/10/11

13

Scan of the phase diagram – world status

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Rapidity spectrum p-

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F (GeV½)0 5 10 15

p+C → π-+X at 31 GeV/c

NA61 p+C results at the deconfinement onset energy confirm approximate proportionality of pion yield to the mean number of wounded nucleons

PR C77,024903 (2008)

Transverse mass spectrum of p-

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Shape of transverse mass spectra is different in p+C and Pb+Pb collisions at 31 GeV/c due to presence of transverse flow in the latter reactions

p+C → π-+X at 31 GeV/c

L and K0s measurement in p+C at 31 GeV

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Invariant mass [GeV/c²] Invariant mass [GeV/c²]

L K0S

0.4 < pT < 0.6 GeV/c

-1.25 < y < 1p

T < 0.2 GeV/c

1 < y < 1.5

Neutrino physics

Precision measurements of hadron production for the prediction of n-fluxes at T2K

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Analysis for T2K

pion spectra in p+C interactions at 31 GeV/c are publishedPhys. Rev. C84 (2011) 034604

they are used to improve beam neutrino flux predictions adjust models (UrQMD 1107.0374, Fritiof 1109.6768) used in neutrino and

cosmic-ray experiments 17/12/2011 Hucisko 17

Measuring cosmic-ray composition

Measurement of particle production spectra Special ’cosmic runs’: p−-C at 158 and 350 GeV/c p-C at 31 GeV/c p-p scan from 13 to 158 GeV/c

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m production related to hadronicinteractions at fixed-target energies

Modern detector installations:high statistics/quality data

Strong model dependence: due mainlyto simulation of m production

Indirect measurement(extensive air showers):

simulations needed

Cosmic ray compositionof central importance forunderstanding sources,

kink, ankle...

THE DEVICE

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NA61/SHINE

2007: forward ToF wall constructed (ToF acceptance extend to p ≈ 1 GeV/c)

2008: TPC read-out (increase of event rate by factor of 10 in comparison to NA49)

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Upgrades completed for the 2011 - Projectile Spectator Detector (PSD), - Z-detectors - A-detector - Low Momentum Particle Detector (LMPD) - He beam pipes

)

Projectile Spectator Detector

Measurement of the energy of projectile spectators Features:

High energy resolution High granularity 60 Lead/Scintillator sandwich Modular design – transverse uniformity of

resolution, flexible geometry, simplicity.

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σ(E)/E = 56%/√E(GeV) + 2%

Z-detectors

Measure charge of ions in secondary ion beams

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Secondary beam

Be/all = 11.2%

A-detector

Measures mass (TOF, 140 m) of ions in secondary ion beams

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11C

12C

σ(tof) 100 ps

Low Momentum Particle Detector

Measures low momentum protons (“target spectators”) Two small size TPCs with 4 absorber and 5 detection layers each

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He beam pipes

Reduces number of δ-electrons and beam/spectator interactions in VTPC

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Device performance

Acceptance » 50% at pT 2.5 GeV/c

Extended ToF acceptance at low momenta (» 1 GeV/c)TOF-L/R: s(t) » 60 psToF-F: s(t) » 120 ps

High detector efficiency > 95%Event rate: 70 events/sec

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Software

The ''old'' software upgrades The Shine software development

port the legacy multi-language, multi-process reconstruction chain to a single process C++ code, with significant reuse of the working parts of the legacy chain,

introduce a new, ROOT-based, event data model, use the C++ framework based of the Offline software of the Pierre Auger

Observatory. The software virtualization

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NA61/SHINE data taking program

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13 20 30 40 80 158

Xe+La

energy (A GeV)

Pb+Pb

Be+Be

Ar+Ca

NA61 ion program

p+p

p+Pb

NA49 (1996-2002)

2009/10/11

2010/11/12

2014

2012/14

2015

p+p

158

T T

STAR (2008-11)Au+Au

T – test of secondary ion beams

The collaboration

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KFKI Research Institute for Particle and Nuclear Physics, Budapest, HungaryThe Universidad Tecnica Federico Santa Maria, Valparaiso, ChileFaculty of Physics, University of Warsaw, Warsaw, PolandFaculty of Physics, University of Sofia, Sofia, BulgariaKarlsruhe Institute of Technology, Karlsruhe, GermanJoint Institute for Nuclear Research, Dubna, RussiaWarsaw University of Technology, Warsaw, PolandFachhochschule Frankfurt, Frankfurt, GermanyJan Kochanowski University in Kielce, PolandUniversity of Geneva, Geneva, SwitzerlandUniversity of Belgrade, Belgrade, SerbiaJagiellonian University, Cracow, PolandUniversity of Silesia, Katowice, PolandUniversity of Athens, Athens, GreeceETH, Zurich, SwitzerlandUniversity of California, Irvine, USAUniversity of Bern, Bern, SwitzerlandUniversity of Bergen, Bergen, NorwayUniversity of Wrocław, Wrocław, PolandRudjer Boskovic Institute, Zagreb, CroatiaUniversity of Frankfurt, Frankfurt, GermanyInstitute for Nuclear Research, Moscow, RussiaState University of New York, Stony Brook, USALPNHE, University of Paris VI and VII, Paris, FranceNational Center for Nuclear Studies, Warsaw, PolandSt. Petersburg State University, St. Petersburg, RussiaInstitute for Particle and Nuclear Studies, KEK, Tsukuba, JapanLaboratory of Astroparticle Physics, University Nova Gorica, Nova Gorica, Slovenia

Summary

NA61/SHINE ion program explore the phase diagram of strongly interacting matter

NA61/SHINE gives unique opportunity to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement

NA61/SHINE performs precision measurements for neutrino (T2K) and cosmic-ray (PAO) physics

NA61/SHINE is complemented by other international projects: CBM at SIS (FAIR GSI), MPD at NICA (JINR), STAR and PHENIX at RHIC (BNL)

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