Some hadrons with strangeness... Mesons: - - - K + = us, K = us: - - PowerPoint PPT Presentation

SLIDE 1

Some hadrons with strangeness...

Mesons: K+= us, K = us: m = 493.677 MeV /c2 K0= ds, K0= ds: m = 497 .614 MeV /c2 K*: m ≈ 892 MeV /c2 ϕ = ss: m = 1019.455 MeV /c2 Λ = uds: m ≈ 1115.683 MeV /c2 Σ+= uus, Σ0= uds, Σ = dds: m ≈ 1192 MeV /c2 Ξ0= uss; Ξ = dss: m ≈ 1320 MeV /c2 Ω = sss: m ≈ 1672 MeV /c2

• Baryons:
• cf. Review of Particle Physics, Phys. Lett. B 667 (2008) 1

SLIDE 2

Particle yields in heavy-ion collisions

plot taken Peter Braun-Munzinger’ s talk at the Blaizot-McLerran Fest (April 24, 2009)

SLIDE 3

plot from Andronic, Braun-Munzinger & Stachel, Phys. Lett. B 673 (2009) 142

Particle yields at midrapidity in Pb-Pb collisions at = 7 .6 GeV √s

NN

dN/dy

−1

10 1 10

2

10

Data (NA49)

=16.3/8

df

/N

2

! Model,

3

=380 MeV, V=1380 fm

b

µ T=138 MeV,

=7.6 GeV

NN

s

+

"

−

"

+

K

−

K p p # #

−

$

+

$ %

Particle yields in heavy-ion collisions

SLIDE 4

Particle yields in heavy-ion collisions

plot from Andronic, Braun-Munzinger & Stachel, Phys. Lett. B 673 (2009) 142

Particle yields at midrapidity in Au-Au collisions at = 200 GeV

dN/dy

−1

10 1 10

2

10 Data STAR PHENIX BRAHMS

=29.7/11

df

/N

2

! Model,

3

= 30 MeV, V=1950 fm

b

µ T=164 MeV,

=200 GeV

NN

s

+

"

−

"

+

K

−

K p p # #

−

$

+

$ % & d d K* * ' * #

√s

NN

SLIDE 5

40 60 80 100 120 140 160 180

T (MeV)

new fits (yields) dN/dy parametrization 4!

100 200 300 400 500 600 700 800 900 1 10 10

2

"sNN (GeV) µb (MeV)

ratios 2005 fits, dN/dy data yields

plot from Andronic, Braun-Munzinger & Stachel, Phys. Lett. B 673 (2009) 142

Chemical freeze-out points

SLIDE 6

plot taken Peter Braun-Munzinger’ s talk at the Blaizot-McLerran Fest (April 24, 2009)

Chemical freeze-out points

• vs. phase diagram

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“Strangeness enhancement”

0.1 0.2 0.3 0.4 0.5 0.6 10

2

10

3

! s (GeV) "S

pp collisions pp

– collisions

e+e- collisions A+B collisions

Wroblewski factor in elementary particle and heavy-ion collisions

plot from Becattini, Gaździcki & Sollfrank, Eur. Phys. J. C 5 (1998) 143

λs ≡ 2s¯ s u¯ u + d ¯ d

SLIDE 8

“Strangeness enhancement”

Yields in p-Be, p-Pb and Pb-Pb collisions at Elab = 158A GeV

plot from ALICE PPR, J. Phys. G 32 (2006) 1295

SLIDE 9

Multiplicities

• 3

10

• 2

10

• 1

10 1 10 Data Model

i) no flavor =595/28

df

/N

2

! =0.82,

s

" ,

3

T=160 MeV, V=26 fm

=91 GeV s

• 3

10

• 2

10

• 1

10 1 10

ii) no flavor, c,b-subtracted data =994/28

df

/N

2

! =0.66,

s

" ,

3

T=168 MeV, V=18 fm

• 3

10

• 2

10

• 1

10 1 10

iii) 5-flavor =499/28

df

/N

2

! =0.66,

s

" ,

3

T=170 MeV, V=16 fm

+

# #

+

K K $ ’ $ f

±

a %

±

% &

+

K* K* ' (1285)

1

f (1420)

1

f

2

f ’

2

f *

2

K p ( )

• )

+

)

• *

++

+

• (1385)

)

+

(1385) ) (1530) *

• ,

(1520) (

plot from Andronic et al., arXiv:0804.4132 [hep-ph]

Particle yields in e+e- collisions

Particle yields in e+e- collisions at = 91.2 GeV vs. “thermal models” √s

SLIDE 10

plot from Beccatini, Castorina, Manninen & Satz, Eur. Phys. J. C 56 (2008) 493 10

• 3

10

• 2

10

• 1

1 10 10

• 3

10

• 2

10

• 1

1 10 Multiplicity (therm. model) Multiplicity (data)

e+e- ! s = 91.2 GeV

T=164.6±3.0 MeV V=40.2±5.7 fm3 "s=0.648±0.026 #2=39/12 dof

$0 $+ %&K0K+ p ' ( &’ )+,0,- *- + $0 $+ K+ K0 & % p &, ( ' )+ )0 )- *- +

Number of St.Dev.

• 4
• 2

2 4

Particle yields in e+e- collisions at = 91.2 GeV vs. “thermal model” √s

Particle yields in e+e- collisions

SLIDE 11

10

• 3

10

• 2

10

• 1

1 10 10

• 3

10

• 2

10

• 1

1 10 Multiplicity (therm. model) Multiplicity (data)

e+e- ! s = 91.2 GeV

" =0.1683±0.0042 GeV2 ms=83.2±4.0 MeV #2=22/12 dof

$0 $+ %&K0K+ p ' ( &’ )+,0,- *- + $0 $+ K+ K0 & % p &, ( ' )+ )0 )- *- +

Number of St.Dev.

• 4
• 2

2 4 plot from Beccatini, Castorina, Manninen & Satz, Eur. Phys. J. C 56 (2008) 493

Particle yields in e+e- collisions at = 91.2 GeV vs. “Unruh-Hawking model” √s

Particle yields in e+e- collisions