pion beam experiment physics motivation (from hades point of view)
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Pion beam experiment
Physics Motivation
(from HADES point of view)
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EM emission from HIV.Koch @ RRTF’GSI
current-current correlator
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-in medium: hadronic models
GeVm
mimM
77.0
)()(
VacuumVacuum::
one example:
W. Peters et.al. NPA 632(1998)109:
Nuclear matterNuclear matter: additional terms : additional terms
+
N-1
N(1520)
+ ...
(1232)
N-1
dominant role of baryons :dominant role of baryons :confirmed by Na60/ CERES resultsconfirmed by Na60/ CERES results
and Rapp/Wambach/Hess calc.and Rapp/Wambach/Hess calc.
2222 )]([)](Re[
)(2)(
MImMmM
MImMA
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•Direct -N Interactions (‘Rhosobars’)
In medium vector meson properties and N scattering
..)4)( VN
N
V
VT
m
mVN
T forward scattering amplitude
)0(12),()(2
)(
VNCM
CMV
Vnp ImTsq
qMs
•low density theorem
•Optical and detailed balance theorem
B.Friman N.PhysA610(1996)
R. Rapp and J.Wambach
In medium properties are related to elementary TVN !
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Which resonances are important for dielectrons ?
V. Koch: artist view of modeling of HI reactions
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Resonance e+e- Decay Branch
Rp exp data
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Which resonances matters at SIS18-100?
GiBUU – J. Weil
p+p at 3.5 GeV
-dominance , N(1520) , N(1520), +..
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How resonances radiate dielectrons?: p+pe+e-pp
eTFF-em. Transition Form Factorspp->ppe+e- @3.5 GeV
pppp0 @3.5 GeV
• Resonance (many!) contribution estimated from pp0 and pn+ channels • Most important for dielectron production are:•(1232) N*(1520) , N*(1720) , (1910)
• Resonances (R) with Mass up to 2 GeV included
• calculations with point-like RN* (QED) does not describe data
eTFF(Me+e-) dependence very important -> Vector Meson contribution is visible!
eTFF
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What are Resonanse-N BR?
GiBUU: (1232) (19%) N*(1520) (38%) N*(1720) (22%) , (1620)(15%), (1905)(6%),
model1:HADES N*(1520) resonance cross section (x 6 GiBUU !) BUT BR for all resonances from BG
New PWA results indicate lower RN couplings !
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p+Nb„excess over pp reference”„slow” (p<0.8 GeV/c) pairs
clear excess in p+A below VM pole & absorption of (observed also in +A exp)
secondary reactions : +N N* (1520),N*(1720), (1620), (1905), NNe+e-
(i.e transport models) or/and in medium modification ?
first Rpe+e- decay process must be understood !
GiBUU
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In medium Kaon properties
K+/K0 considered as good quasiparticle (no strong resonance couplins)-small absorption
K- : spectral function due to coupling to (1405) (similar effects as for )- strong absorption
(1405)
K- K-
N-1
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K0s in Ar+KCl @ 1.756 GeV
data: PRC 82 (2010) 044907
IQMD : repulsive UKN 38 MeV
mK* = mK (1-*/B )
( negative for K0)
In medium K0 potential
K0s in p+Nb @ 3.5 GeV
GiBUU : Chiral (Scalar+Vector) potential
no potential
with potential
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+A experiment
(first beam time)
• measurement of kaon (K+ , K- ) absorption in cold nuclear matter –> kaon potential • meson• large counting rates for HADES – possibility to obtain important physics output within 2-3 days of beam on target
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KK00 production –sensitivity to production –sensitivity to potential potential
• higher beam energy prefered because of possibility to study K- and production
FOPI: PRL102(2009)183591, ANKE : EPJA22(2006) 301
previous data from:
expectations for HADES
@1.2 GeV
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KK-- / / production production
K- expectations for HADES
ANKEPhys. Lett. B 695, 74-77 (2011).
data on Transparency (p+A)
0 < < 8 0
0.6 <p < 1.6 GeV/c
*
absorption -> in medium width *
(model dependent – large ecceptrance! )
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Expected count rates & target Expected count rates & target separations separations
K0 reconstruction
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- +p experiment
(second beam block ~21 days)
• e+e- emission from baryon resonaces1 or 2 energy points ; s=1.48 GeV, s=1.7 GeV+ minimal energy scan around (2-3) points (40 MeV) for 2 final states to constrain (2) production
• K, K production at s=1.7 GeV
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Meson and Resonanse Meson and Resonanse production with pion beamsproduction with pion beams
Eth
resh
[GeV
]
Mx [GeV/c2]
/
pp->ppX
-p->Xn
Meson production thresholds
• direct resonance excitation: second, third res. region
• p>0.5 GeV/c weak contribution from (1232) (1232)->Ne+e- small
• main background for -p Rn e+e- is /0 e+e-
N*,
1.21 1.52 1.68
s
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There are also constraints from N reactions
: optical theorem
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2 decay channels of resonances
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Resonance excitation in 2 channel
s
N(1440,1710) +(1910) N(1535) +(1620) N(1720) +(1600) N(1520) +(1700) N(1680) +(1905) N(1675) +(1925)
• s =1.5 dominance of D13(1520)
•s =1.7 dominance of F15(1680), D33(1700), P13(1720)
expectations for dielectrons:
2014: B-G (A.Sarantsev) K-matrix approach constraints from N, N
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Predictions for - p2NM. Effenberger et al. PHYS. REV. C 60(1999) 044614 V. Shyklar: RRTF@GSI, Seillacbased on Maley and Saleski analysis of N
2014: B-G (A.Sarantsev) predictions for 2K-matrix approach -constraints from N, N
• controversial results:„old” Manley and new B-G results
• direct measurement of 2pion and e+e-channels are mandatory! (also conclusion from RRTF @ GSI)
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e+e- production ampltidues in -p reactionsInteference effects are important below threshold!
S31 - S11 and D13 – D33
M.F.M. Lutz , B. Friman, M. Sayuer . Nuclear Physics A 713 (2003) 97–118
Kaempfer , A Titov , R.Reznik Nucl. Phys. A721(2003)583
• are interference effects important?• measure e+e- mass and angular distributions
M.F.M. Lutz , B. Friman, M. Sayuer NPA 713 (2003) 97–118
π - p
π +n
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e+e- production ampltidues in -p reactions
„Born terms”
N* resonance contribution
M. Zetenyi, G. Wolf PRC86 (2012) 065209
+ extended VectorDominanceModel! k2 not m2 („clasical VDM”)
*(k)
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e+e- production ampltidues in -p reactions
s=1.9 GeV
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Predictions from GiBUU -p : J.Weil’2014
E = 540 MeV (p=0.66 GeV/c)
Integrated cross section for M>0.28 GeV/c2 (full solid angle) 484 nb(~ 8 higher than in B-G model)
Total component
E = 900 MeV (p=1.03 GeV/c)
Integrated cross section for M>0.28 GeV/c2 (full solid angle) 247 nb(~ 2.5 higher than in B-G)
Total component
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Hyperon production
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Hyperon production
D. Manley
large discrepancies in exp data around 1.7 GeV !
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Cross sections
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Angular distributions K0
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Angular distributions K0
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polarization
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polarization
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Angular distributions
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• At low energy S11(1650) and P11(1710), P13(1720) are dominant resonances for Kbut still controversy about amplitudes from various PWA• B.t.w S11(1650) is the one which couples strongly to in Lutz/Souyer model and P13(1720) to !• at higher energy essentially no exp information available
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Connection of K channel to „ puzzle”
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Connection of K channel to „ puzzle”
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Connection of K channel to „ puzzle”
Conclusion:
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Summary of NK-M.DoeringHADES CM @ Saillac
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count rate estimates
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Estimates (e+e- M>140 MeV/c2)-TDR
p =1.1 GeV/c
Resonance model: constant eTFF (QED)from Zetenyi & Wolf
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Estimates (2pion)- TDReff*acc(2pion)~ 0.17
CS ~5 mb( -0 ) 6-11 mb (+ - )
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Remark: At s ~1.7 GeV (p~1.05 GeV/c (maximum of cs) we have foll. numbers:
Cs: 0.25 0.6 0.25
x2 x 4 x 2 counts
~96kE ~26kE ~20 kE
TDR @ p=1.7 GeV/c
440 kE 250 kE 220 kE
Reconstruction/day exclusive 48.000 1800 1400
Reconstruction semi exclusive(only K0) 13 000 10 000
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additional information
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No conclusion about -N* coupling- polarization experiment needed
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coupling to resonances: +p
data: CBTAPS (total and differential cross sections, polarization)
fit: PWA B-G (p.com. A.Sarantsev)
P13 (1720)P13 (1900)
non-resonat contributions
F15 (1685)
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Isospin decompositon
A2I,I, I –isopin of input channel, I’ -isospin 2pions (or e+e system)
4 amplitudes -> 6 constants (modules and phases) are needed ! – we cannot obtained it from future HADES data only. Instead we have to use other data (N and N) to constrain possible solutions
For example Precise data from CB @BNL exist for W=1.2:1.52 GeV
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Coupled channel effects
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Importance of CC effects !
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Which resonances matters?
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examples: resonance model
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K()()
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remark: at 1.7 GeV/c we would have less pions/spill (see prev.slide)
0.7
1.24*108