High p T probing of baryonic m atter S.S. Shimanskiy (JINR, LHEP) - - PowerPoint PPT Presentation

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High p T probing of baryonic m atter S.S. Shimanskiy (JINR, LHEP) - - PowerPoint PPT Presentation

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High p T probing of baryonic m atter S.S. Shimanskiy (JINR, LHEP) 02.07.2014 HSQCD'2014 Shimanskiy S.S. Plan 1. States of baryonic matter 2. Cold dense baryonic matter 3. Cumulative processes. What we have seen? 4. Future

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“High pT probing of baryonic matter”

S.S. Shimanskiy (JINR, LHEP)

02.07.2014 HSQCD'2014 Shimanskiy S.S.

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Plan

  • 1. States of baryonic matter
  • 2. Cold dense baryonic matter
  • 3. Cumulative processes. What we have

seen?

  • 4. Future

02.07.2014 HSQCD'2014 Shimanskiy S.S.

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Structure of Matter

Two ways that structure is revealed: True from atoms to particles…..

  • F. Close

p 

 

  

*

A A   

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+ CERN Yellow Report 2007-005, p.75 2008-005

Nuclotron-SPS Time (CERN)

Nuclear Physics A 837 (2010) 65–86

RHIC Time(BNL)

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Thermalization in Elementary Collisions ?

  • T  170 MeV (good old Hagedorn temperature)
  • Tch does not (or only weakly) depends on s
  • Universal hadronization mechanism at critical values ?

Beccatini, Heinz, Z.Phys. C76 (1997) 269

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Cold dense baryonic matter is not created during AA-collisions.

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Cumulative particle

PI PII

{ {

XI XII

{

{

AI AII

}

S>S0

V.S. Stavinsky JINR Rapid Communications N18-86, p.5 (1986)

(XIMI) + (XIIMII)  mc + [XIMI + XIIMII + m2 ] Quark-parton model (XIPI) + (XIIPII)  M(XI,XII)

kinematic limit for free NN- interaction

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XI  [0,AI] and XII  [0,AII] XI = XII = 1 - for free NN-interaction kinematical borders S0

Cumulative and Subthreshold processes Scumulative > S0

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Cumulative processes: 1) XI ≤ 1 and XII > 1 Fragmentation 2) XII ≤ 1 and XI > 1 regions 3) XI > 1 and XII > 1 Central region

y0 XI >1 XII > 1 XI > 1, XII > 1 S0- kinemat.

12

}

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SPECTRA

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A.M.Baldin,V.S.Stavinskiy et al. Dubna 1971

Cumulative processes

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A.V. Efremov (1976) Parton description

3 3

( ) ( ) ( ) ( , , )

B A C

d x y dxdydzF y F x G z v xys t u d p z z    

xII xI

A + B  C + X

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Fluctons Probability inside nuclei

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Эксперимент указывает, что отношение выходов кумулятивных пионов π+/π- равно единице Schroeder L.S. et al. // Phys. Rev. Lett. 1979. V. 43, n. 24. P. 1787 A.M.Baldin et al., Yad.Fiz., 20, 1975, p.1201 02.07.2014 HSQCD'2014 Shimanskiy S.S.

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19

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А – dependence (1974-…)

1

_ ( ) ~ _

n

A heavy nuclei d p A А light nuclei dp   

      

5|/3 2

_ ( ) ~ _ A for d d p A B dp A for t         

The same time Cronin team at FNAL have seen about the same A-dependence for pA(for 200, 300, 400 GeV protons) high pT Particle production

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DIS

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K.Rith

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A.Stavinskiy, ITEP seminar, 11.4.2007

eA scattering JLAB data

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Having these data, we know almost full (99%) nucleonic picture of nuclei with A  56

Single particle (%) 2N SRC (%) 3N SRC (%) 56Fe 76 ± 0.2 ± 4.7 23.0 ± 0.2 ± 4.7 0.79 ± 0.03 ± 0.25

12C

80 ± 02 ± 4.1 19.3 ± 0.2 ± 4.1 0.55 ± 0.03 ± 0.18

4He

86 ± 0.2 ± 3.3 15.4 ± 0.2 ± 3.3 0.42 ± 0.02 ± 0.14

3He

92 ± 1.6 8.0 ± 1.6 0.18 ± 0.06

2H

96 ± 0.8 4.0 ± 0.8

  • Fractions

Nucleus

Using the published data on (p,2p+n) [PRL,90 (2003) 042301] estimate the isotopic composition of 2N SRC in 12C app(12C)  4 ± 2 % a2N(12C)  20 ± 0.2 ± 4.1 % apn(12C)  12 ± 4 % ann(12C)  4 ± 2 %

JLAB Phys Seminar Dec05 K. Egiyan

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eA – program at JLab

R.Subedi et al., Science 320 (2008) 1476-1478 e-Print: arXiv:0908.1514 [nucl-ex]

12C - structure

RNP – program at JINR

V.V.B., V.K.Lukyanov, A.I.Titov, PLB, 67, 46(1977)

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«FLUCTON» SRC

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Phys.Rev. C85 (2012) 054904

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Phys.Rev. C85 (2012) 054904

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Where and which model are correct?

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The Correlation Measurements pA->h+Х

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xT ~ 1

Magnet Spectrometer Tracker

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SPIN Magnet Spectrometer

protons

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Physics of Atomic Nuclei, 2013, Vol. 76, No. 10, pp. 1213–1218

Measurement of the Yields of Positively Charged Particles at an Angle of 35◦ in Proton Interactions with Nuclear Targets at an Energy of 50 GeV

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h+ - spectrum

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A-dependence

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[2012]

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Ratio

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Ratio p/+ (2013)

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PRELIMINARY PRELIMINARY

-/+(2013)

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Ratio d/p

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Ratio t/d

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Average baryon number <B>

PRELIMINARY

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Flucton fragmentation – same side flow

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FUTURE

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FODS

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IHEP, Protvino

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The PANDA Detector

beam interaction point solenoid dipole EM and hadron calorimeters target generator RICH drift or wire chambers TOF stop muon counters

12 m

( ) ' { } p p A p X   

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B M p M p B   

}

p

p

Exclusive reactions as way to resolve questions

B (p,, …), M (, K , l…)

{

B

M

B

M

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? ( ) ( , ) pp pp KK p pp pp pp nn p pp KK             

}

The counting rules and isotopic symmetry studies, pT ~ 2 GeV/c anomaly(?)

}

pp

studies at xT ~ 1

Detail vertexes studies:

( ) ( ) ( ) ( ) ( ) ( ) ( ) q q q q quark antiquark q q qq qq quark antidiquark qq qq diquark antidiquark         

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END

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Color(nuclear) transparency in 900 c.m. quasielastic A(p,2p) reactions

The incident momenta varied from 5.9 to 14.4 GeV/c, corresponding to 4.8 <Q2 <12.7 (GeV/c)2.

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1.55 1.83 2.07 2.28 2.48 2.66

pT

?

Color(nuclear) transparency

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  • quantify departure from binary scaling in AA

ratio of yield in AA versus reference collisions

  • e.g.: reference is pp  RAA
  • …or peripheral AA  Rcp (“central to peripheral”)

The nuclear modification factor at RHIC and LHC

AA pp AA AA

1 Yield Yield Nbin R  

central AA, periph AA, periph AA, central AA, cp

Yield Yield Nbin Nbin R  

FA - CERN Summer Student Lectures - August 2011

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CT region

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pT~2 GeV/c anomaly at high energy (RHIC and LHC)

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harged hadron suppression in Pb-Pb

For central collisions:

  • A pronounced minimum at 𝑄𝑈 = 6 − 7 𝐻𝑓𝑊 where 𝑆𝐵𝐵 ≈ 0.2
  • At higher 𝑄𝑈 𝑆𝐵𝐵 rises and levels off above 40 GeV
  • Suppression at high 𝑄𝑈 at the same level as jet suppression

EPJC 72 (2012) 1945

Pb Pb Pb Pb

𝑆𝐵𝐵 = 𝑂

𝐾𝑓𝑢 𝐵𝐵/𝑂𝑑𝑝𝑚𝑚

𝑂

𝐾𝑓𝑢 𝑞𝑞

Charged hadron suppression in Pb-Pb

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J.W. Cronin et al., Production of hadrons at large transverse momentum at 200, 300, and 400 GeV, Phys.Rev. D, v.11, N 11, 3105-3123 (1975)

V.S. Pantuev Physics of Atomic Nuclei, 2009, Vol. 72, No. 12, pp. 1971–1981

pT ~ 2 GeV/c region

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E.A. Crosbie et al., Phys.Rev. D, vol.23, N3,1981 pT ~ 2 GeV/c

(90 ) p p pp  

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pp -> π + X