Phi meson physics

1
Phi meson physics

• Marianna Testa
• University of Roma La Sapienza INFN
• for the KLOE collaboration
• ee- Collisions from Phi to Psi,
• Novosibirsk 27 February-2 March 2006

2
f discovery

• First seen in bubble chamber
• experiments at Brookhaven in 1962
• in the reactions
• K- p ? L KK
• K- p ? L KK-
• Mass ?1020 MeV, G ltlt20 MeV
• Quantum numbers JPC 1--

• High signal for the decay in KK,
• at the edge of the kinematically
• allowed region,
• rp decay suppressed
• Zweig rule

3
f at ee- collider
SND s(ee-? KSKL) PRD 63,072002 (2001) mf
1019.42? 0.05 MeV Gf 4.21 ? 0.04 MeV
Absolute BR can be determined using s (f? f) and
G(ee-) (only) at a f factory
s(ee-? KSKL) (mb)

• Using
• Gf /Gtot from SND CMD-2
• with f KK- , KK, pp-p0, hg , p0g
• G(ee-) from KLOE

f ? KSKL KS ? pp-
W (MeV)
4
F factories

• DAFNE
• Ebeam 510 MeV
• 2 separate rings for e e- to minimize beam-beam
• Lpeak ? 1.3 ? 1032 cm-2s-1
• up to 120 bunches 20 mA per bunch
• Crossing angle at 12.5 mrad
• KLOE experiment
• ? 2.4 fb-1

• VEPP 2M (1974-2000)
• Ebeam 180-700 MeV
• scan stepD? s (1 10 )MeV
• 1 bunch
• beam current 10-50 mA
• Lpeak ?3 ? 1030 cm-2s-1
• Circumference 18 m
• Time collisiont 60 ns
• 2 experiments CMD-2 SND
• ? 40 pb-1/detector

Luminosity (pb-1) Luminosity (pb-1)
2001-02 492
2004 734
2005 1256
Total 2482
5
Physics at a f -factory
A f-factory is a collider ee- running at ?s
Mf, sf 3mb

• KAON physics
• Vus , kaon form factors from semileptonic KS,L
  ,K? decays
• Rare KS,L decays (Ks?p0p0p0 )
• CPT test with semileptonic Ks , KL charge
  asymmetries
• Non Kaon Physics
• radiative f decays (scalars, pseudoscalars
  photon)
• hadronic cross section

0-
1-
0
f (1020)
BR 83
g
a0(980)
KK
g
f0(980)
g
p
p0
h'(960)
w(780)
g
r(770)
BR 1.3
BR 15
h(550)
g
p0
6
Kaon production at the f resonance
The f decay at rest provides monochromatic and
pure beam of kaons

• The KK pairs in the final state have the same f
  quantum numbers, i.e. are produced in a pure JPC
  1 state

• 1.5? 109 K pairs/fb-1, 1. ? 109 KS KL
  pairs/fb-1

7
Kaon physics at a f factory

• Kaon at fixed
• target experiments
• Higher rate production
• Higher energy particles

• Kaon at a f Factory
• Tagging
• observation of KS,L signals presence of KL,S
• precision measurement of absolute BRs
• Kinematical closure
• of the events
• Pure beam
• of tagged KS mesons
• Interference measurementes
• in the K system

8
Kaon interferometry
where t1(t2) is the time of one (the other) kaon
decay into f1 (f2) final state and
characteristic interference term at a
f-factory entire set of K parameters from
interferometry
fi pp-, p0p0, pln, pp-p0, 3p0, pp-g ..etc
9
Kaon interferometry (II)
Integrating in (t1t2) we get the time difference
(Dtt1-t2) distribution (1-dim plot)
From these distributions for various final states
fi one can measure the following quantities
Phases (difference of) from the interference term
only at a f factory
10
KSKL interference and QM coherence
I(Dt) ? e-GLDt e-GSDt - 2(1 - zS,L) e-(GS
GL)Dt/2 cos(DmDt)
KLOE preliminary Fit with PDG values for GS,
GL Dm (5.34 ?0.34) 109 h s-1 PDG 04 (5.301
? 0.016) 109 h s-1 Fix Dm to PDG 04 value,
obtain

• Data 7366 evts
• Fit c2/dof 15.1/22

Coherent KL regeneration on beam pipe
Peak position sensitive to Dm
No simultaneous events same final state/
antisymmetric initial state
cf. Bertlmann 99 (CPLEAR)
0.16 -0.15
zS,L 0.13
t1 - t2/tS
13
11
K physics

• KS beam
• UL on BR(KS ? p0p0p0)
• BR(KS ? pen) and charge asymmetry
• KL beam
• main KL BRs and KL lifetime
• form factors
• eK from KL ? pp , Re(e/e)
• Charged kaons
• BRs for semileptonic and 2-body decays, K
  lifetime

CP, CPT tests
Vus
12
Vus at a f factory

• Extract Vus from ?(K????(?))/?(?????(?))
  ratio.
• Dominated by the theoretical uncertainity on the
  fK/f? evaluation.
• At af factory all experimental inputs
  aviable
• Branching ratios, lifetimes, and form factors.

• Most precise test of unitarity possible at
  present comes from 1st row

Vud2 Vus2 Vub2 Vud2 Vus2 ? 1
D
Can test if D 0 at few 10-3 from super-allowed
0? 0 Fermi transitions, n b-decays 2VuddVud
0.0010 from semileptonic kaon decays (PDG 2004
fit) 2VusdVus 0.0011

• Extract Vus From Kl3 decays

G(K0 ? pen(g)) ? Vus 2 fi(0) 2 Ii(l ,,l0
,a) Sew
where i runs over the four modes K?,0 (e3), K ?,0
(m3)
fi(0) form factor, I(l) phase space integral,
Sew short distance correction (1.0232)

• Extract Vus from ?(K????(?))/?(?????(?)) ?
  Vus2/Vud2fK2/f?2.

Vus 0.22230.0025 KLOE preliminary
At at f factory all experimental inputs are
aviable Branching ratios, lifetimes and form
factors.
13
Vus KL branching ratios, life time, slopes
KLOE mmts at 0.5 BR(KL ? pe?(?)) 0.4007 ?
0.0006 ? 0.0014 BR(KL ? pµ?(?)) 0.2698 ?
0.0006 ? 0.0014 BR(KL ? 3p0) 0.1997
? 0.0005 ? 0.0019 BR(KL ? pp-p0(?)) 0.1263
? 0.0005 ? 0.0011
tL 50.84 ? 0.23 ns
Lesser of pmiss-Emiss in pm or mp hyp (MeV)
For Ke3 Form factors slopes f(t) f(0) 1
lt or f(0) 1 l t ½ l
t2
see talk Neutral Kaons at KLOE...
14
V us Charged kaon decays
BR(K ? mn(g))
0.6366 ? 0.0009stat. ? 0.0015syst
PLB632,76-80(2006).
Vus 0.22230.0025
see Versacis talk
KLOE preliminary BR(K ?e3) 5.047 ?
0.046stat BR(K ?m3 ) 3.310 ? 0.040stat systemati
c error evaluation to be completed
15
Vus at a f factory
Fitting the 5 Vusf(0) KLOE determinations
?2/dof1.7/4
Quad form-factor param. ?' 0.0221 0.0011 ?''
0.0023 0.0004 ?0 0.0154 0.0008 (KTeV
ISTRA) Marciano hep-ph/0512039
Quad form-factor param. (KLOEKTeV
ISTRANA48) f(0)0.961(8) Leutwyler Roos
Vus
KL lifetime from KLOE tL 50.84(23) ns
unitarity
Vus 0.2248? 0.0020 from KLe3, KLm3,
K?e3, K ? m3,Kse3 Vud 0.97377 ?
0.00027 CKM 2005 Proceedings Vus/Vud
0.2294 ? 0.00026 from K ? m2
16
CPT CP test KS physics
KS ? 3p0 is purely CP violating If CPT
conserved, GS GL ee000 SM prediction BR(KS
? 3p0) 1.9 10-9 BR(KS ? 3p0) lt 1.410-5
(first limit, SND) BR(KS ? 3p0) lt 1.210-7
(KLOE)
(eS,L e ? d)
KS ? pen

Sensitivity to CPT violating effects through

charge asymmetry AS

Test of the DS DQ rule, Vus
determination


CMD2 first observation PLB456,90 (1999)
d BR(Ks ? pen ) (7.2 1.4) ? 10-4
KLOE BR(KS ? pen) (7.09 ? 0.08stat ? 0.05syst)
10-4
AS (-2 ? 9stat ? 5syst)
10-3 AL (3.322 ? 0.058 ? 0.047) 10-3 Re(x)
1/4 (G(KS ? pen)/G(KL ? pen) -1 ) (0.6 ?
3.1stat ? 1.8syst) 10-3
11
17
CP BR KL ?p p-
KLOE Preliminary result BR(KL ? pp-) (1.963
?0.012 ?0.017) ?10-3
4 standard deviations discrepancy wrt
PDG04 (2.090 ? 0.025) ?10-3 agreement
with KTeV
PDG2004 KTeV KLOE
BR(KL ? pp-) ?10-3
Using BR(KL? pp) and tL from KLOE and tS from
PDG04 e (2.216 ? 0.013) ?10-3 e PDG04
(2.284 ?0.014)?10-3
1.6 s agreement with prediction from Unitarity
Triangle
18
h,h physics

• At a f factory
• 4? 107 h/fb-1, 4. ? 105 h/fb-1
• lower bkg with respect to
• pp reactions
• tagging h,h antiparallel to
• monoenergetic photon
• (360 MeV for h, 60 MeV for h)
• h,h simultaneously collected
• s h() /stot ??100 with
• respect to hadronic production

BR(f ? hg) (1.295 0.025)?10-2 BR(f ? hg)
(6.2 0.7) ? 10-5
f? hg ? p0p0p0g KLOE
19
C,P,CP, cpt test h physics
h? p0gg biggest contribution p6 in ?PT

• h ? ppg dominated by
  vector meson
• h ? ppg sensitive to
  box anomaly
• h
  quark structure
• 
  (gluonium content)
• h ? g ll,lll()l() (Dalitz decays)
  e.m. form factors

KLOE preliminary BR(h?p0gg) ( 8.4 2.7stat
1.4syst ) 10-5 agrees with Op6 calcolutions
h? ggg C violating KLOE BR(????3?
????1.6?10?5 _at_ 90 CL
h ? g ll-,lll()l() (dalitz double
dalitz decays) e.m. form factors CMD-2
BR(h? g ee- ) (7.10 0.64 0.46) ?10-3
BR(h ? ee-pp- ) (3.7 2.5 1.8 0.3) ?
10-4 (CP violating in flavour
conserving process) SND BR(h? g ee- )
(5.15 0.62 0.39) ?10-3
20
C,P,CP, cpt test h physics (II)
Q 22.8 ? 0.4 B.Martemyanov,V.Sopov, PRD 71
(2005) 017501 violation of the Dashen theorem
(QDash. 24.2 if (m2?-m2?0)em (m2K-m2K0)em)

• h ? pp- C,CP violating

CMD-2 BR lt 3.3 10-4 _at_90 C.L. KLOE BR lt 1.3
10-5 _at_90 C.L.
see next talk

• ? ee- , mm- a4
  process BR( 10-8, 10-6)
• 
  helicity suppressed , sensitive to new
  interactions
• Lepton flavour violation
• h ? em- , me LF BR(PDG04 lt 6 10-6)

21
Scalar mesons

• not easily interpreted as qq meson
• (3P0 nonet)
• other interpretations
• qqqq states (Jaffe 77),
• KK molecules (Weinstein-Isgur 90)
• Extract f to scalar coupling
• Since f ? ssgt
• G(f ? gscalar) ? s-quark content
• ? 4-quark vs. 2-quark states
• confirm of f0(600)

• Both BR(f ? Sg) and scalar mass
• spectra are sensitive to their nature
• Achasov, Ivanchenko 1989

22
pp-g (p0p0g ) Looking for f0 ?pp- (p0p0)
First observation98 SND of f ? f0g?p0p0g
KLOE clear evidence of f ? f0g ? pp-g (see
next talk)
First observation 99 CMD-2 of f? pp-g
f0 more coupled to kaons than to pions
KLOE evidence of f0 in charge asymmetry
23
p0hg Looking for a0(980)??p0

• KLOE PLB536,209 (2002) 16 pb1
• BR(f ? hp0g ) (8.5 ? 0.5stat ?0.6syst) ?105
• Statistics x 20

????
24
Future of f factory?
Present Linof KLOE now Lpeak 1.3 ? 1032 cm-2
s-1
High lumnosity is necessary to access
Search/measurement of forbidden/rare decays
sensitiv to short distance dynamiocs (rare K
dec, g-2 CPT test) (complementry to
LHC) Precision measuremente of fundamental SM
parameters (CKM abgles, quark mass) Deeper
undersanding of QCD in the non perturbative
regime KS decays sensitivity to CPT
test Neutral kaon Interferometry X pt
studies Program complementary to LHC Proposal
to upgrade the collider capable to delived 50
fb-1 in 2/3 years
LNF proposals
Dafne short term upgrade L up to 5? 1032 cm-2
s-1, Lint? 20fb-1
new machine L gt 8 ? 1032 cm-2 s-1 Lint gt
50fb-1
see Venanzonis talk
25
Prospectives for KS physics
Lint 20-50 fb-1 CPT and DS DQ violating
parameters down to the per mill level Competitive
on rare dacays, interesting for cpt mostly
Present _at_20fb-1
_at_50 fb-1 measurement
KS ? p0 p0 p0 CP,CPT lt 1.2 10-7
lt 5? 10-9
seen KS ? pen CPT, DS DQ (7.09?
0.10)??10-4 ?0.2? 10-5 ?0.1
?10-5 As CPT
(1.5 ? 11) ? 10-3 ?2? 10-3
?1 ?10-3
KS ? p p- p0 cpt (3 ? 1)?10-7
? 0.4? 10-7 ? 0.3? 10-7
KS ? ee- lt 1.4 ?
10-7 lt 2 ? 10-8 lt 9 ?
10-9
KS ? p0 ee- KL (6? 3)?10-9
seen ? 2? 10-9 KS ? gg
cpt (2.78 ? 0.07)?10-6
?0.03? 10-6 ?0.02? 10-6
Assuming present efficiencies or e ?5-10
26
Kaon interferometry main observables
measured quantity
parameters
mode
27
Prospectives for Interferometry
Mode Parameter Best measurement or PDG-04 fit KLOE-2 L100 fb-1
pp- pp- Dm 5.288 0.043 109 ? s-1 0.02STAT ? 109 ? s-1
pp- p0p0 Re(e/e) (1.67 0.26)? 10-3 0.2STAT? 10-3
pp- p0p0 Im(e/e) 0.0012 0.0023 0.0022STAT
pp- pen AL (3322 58 47 )? 10-6 18STAT? 10-6
pen pen Re(dK) (0.29 0.27)? 10-3 0.2STAT? 10-3
pen pen Im(dK) (0.24 0.50)? 10-4 20STAT? 10-4
28
Test of Quantum Mechanics and CPT at a f factory
Several models can be tested (only) at a f
factory
Simple decoherence model z? 0
QM
Decoherence related to Quantum gravity and CPT
violation, J. Ellis et al (1984)
Novel type of CPT violation for correlated KK
states , J. Bernabeu et al. (2004)
29
Decoherence related to Quantum gravity and CPT
a, b, g
present KLOE KLOE VDET -- CPLEAR
results -- Plancks scale region
30
Novel type of CPT for correlated KK states w
d(Re w) (similar for Im w)
present KLOE KLOE VDET -- Plancks scale
region
int. lum. (fb-1)
31
CPT Bell-Steinberger
Test of CPT trough Bell Steinberger relation
only at a f factory pure KS beams gives access
low BR, access to KSKL interference term
At present f ppg contributes with the bigger
error to Im d (sensitivity 10-5)
32
Prospectives for h scalars physics_at_20fb-1
Large samaple of h ? 9x108 and h ? 4x106
Intersting channels
h? p0gg BR( 8.0 2.7 ) 10- with
e4.63 3000 evts
study of gg spectrum h, h? g ll-,lll()l()
(Dalitz double dalitz decays) with high
statistics h? pp- ee -
test of CP violation beyond SM h? hpp-
sensitive to s(600)
expcted 200.000 events
With 20 fb-1 f ? f0g , f? KK- (KK) (expected
BR 10-6(-8) ) well measured (105 KK- and
103 KK), direct measure of the gfKK coupling
33
Physics with 20-100 fb-1
Kaon physics General remark _at_20 fb-1 CPT and
DS DQ violating parameters down to the per mill
level competitive on super rare dacys,
interesting for cpt mostly Re(x)
Contribution of BR(KS ? p
en) _at_20fb-1 (2 10-3 )
similar to ohers As
_at_20 fb-1
3s measurement Bell Steinberger Relation
Interference in the pp(g) channle bring

to total error Im d to present of 10-5
down
to 10-6, equivalent to K0 K0 mass relative

difference below 10-19 KS ? p0 ll-
pollution to KL ?
p0 ll- via KSKL mixing
_at_20 fb-1 seen,_at_50fb-1
sensitivity to 10-9

theory request 15 accuracy
KS ? p0 p0 p0
_at_20 fb-1 5 ?10-9
sensity
_at_50fb-1 few events obervable KS ? p p-
p0 _at_20 fb-1
precision 15
KS ? gg
_at_20 fb-1 5 error
d (l0) 10-3 d(l0) l0-4
check of the SU(3) breaking in
f(0)
34
Physics program vs luminosity

• 101 fb-1
  
• Kaon physics
• CPT and DS DQ violating parameters down to the
  per mill level
• Competitive on super rare dacays, interesting for
  cpt mostly
• Re(e/e) _at_10-4 (direct CPV)
• K L,S interferometry Im(e/e)
  _at_10-2 (CPT)
• h physics
• Dalitz decays h ? ee-g, mm-g, ee-ee-,pp-ee-
  decays (BRs 10-3 10-5)
• C,P,CP ,LF test via h? pp, ggg, me-,em-,
  Significant improvement on UL
• ? p0gg study of the shape on gg mass,
  sensitive to test of VDM and a0
• ? ee-, exp BR 6 ?10-9 (a4 process BR(
  10-8, 10-6)
• helicity suppressed ,
  sensitive to new interactions) UL (lt7.7 10-5)
  
• ? mm- expe BR 4 ?10-6 () BR(5.8 0.8)10-6

35
102 fb-1 CPT test _at_ unprecedentetest level
of precision via 1) rare
KLKS interferences 2) rare
direc CPV violation in K asym and rare KL

103 fb-1 sensitivity ot KL p0nn (KL pee,
KL pvv) _at_ SM level (_at_ f
factory no bkg from neutral baryons, kaons 4 mom
know) region of high
discovery potential for non
standards source of CPV via
new tests of CKM mech in then kaon system
36

• physics
• _at_ 20 fb-1 6 ?108 h mesons produced
• Dalitz and double Dalitz decays
• h ? ee-g, mm-g, ee-ee-,pp-ee- decays (BRs
  10-3 10-5) easily reached _at_20 fb-1
• C,P,CP ,LF violating decays
• ? pp, ggg, me-,em-,
  Signifacant improvement on UL
• Statistics benefit on other decays
• ? p0gg study of the shape on gg mass,
  sensitive to test of VDM and a0
• ? ee-, exp BR 6 ?10-9 UL (lt7.7 10-5)
  (but bkg from ee ee(g))
• ? mm- expe BR 4 ?10-6 BR(5.8 0.8)10-6

37
_at_20 f KKG well measured 104 Kk and 103 K0K)
38
CPT KS semileptonic decays
Sensitivity to CPT violating effects through
charge asymmetry AS
KLOE
Test of the DS DQ rule, G(KS ? pen)/G(KL ?
pen) 1 4 Re(x ) FISRT OBSERVATION CMD-2
BR(Ks ? pen ) (7.2 1.4) ? 10-4 KLOE BR(KS ?
pen) (7.09 ? 0.08stat ? 0.05syst) 10-4
AS (-2 ? 9stat ? 5syst) 10-3
AL (3322 ? 58 ? 47) 10-6 Re(x) (0.6
? 3.1stat ? 1.8syst) 10-3
39
Physics with 100 fb-1
AS
sensitivity 10-4

probe the K0 K0 mass difference to
10-18 level
(if CPT is violated only in
the mass matrix) KS ? p0 ll-
pollution to KL ? p0
ll- via KSKL mixing
error at 10 level

theory request 15 accuracy
40
Conclusions
A f favcotry provides the ideal place to perform
almosto without competitors KS physics Quantum
interferencem studies h/h physics High
luminosity to access rare KS decays sensitivity
to CPT test Neutral kaon Interferometry X pt
studies Program complementary to LHC
41
Spare slides
42
Leptonic width G(f? ll)
KLOE, PLB 608, 199 (2005) using ee- ? ee- and
ee- ? mm- G(f ? ll-) (1.320 0.017
0.015) keV
SND, PRL 86, 1698 (2001) from ee- ? mm- B(f ?
ll-) sqrt(B(f ? ee-) B( f ? mm-)) (2.89
0.10 0.06) ?10-4
43
KL lifetime
Measure using KL ? p0p0p0 tagged by KS? pp-
events
KLOE tL 50.92 ? 0.17 ? 0.25 ns
Average with result from KL BRs tL 50.84 ?
0.23 ns
cfr Vosburgh 72,tL 51.54 ? 0.44 ns
44
KLe3 form-factor slopes
Parameterization t (pK - pp)2/m2p For
Ke3f(t) f(0) 1 lt or f(0) 1 l
t ½ l t2 KLOE preliminary Linear fit l
(28.6 0.5 0.8) ? 10-3 Quadratic fit l
(25.5 1.5 1.9) ? 10-3 l (1.4
0.7 0.7) ? 10-3 r(l, l ) -0.95
1s contours
l? 10-3
KTeV
ISTRA
KLOE
NA48
l ? 10-3
45
SND collaboration PRD 63,072002 (2001) ??BR(f
?ee-) (2.93 0.02 0.14 0.02)? 10-4 BR(f
?KK-) (47.6 0.3 1.6 0.3 )? 10-2 BR(f
?KSKL) (35.1 0.2 1.2 0.3 )? 10-2 BR(f ?p
p-p0) (15.9 0.2 0.7 0.4 )? 10-2 ??BR(f
?hg) (1.33 0.03 0.05 0.01 )? 10-2 mf
(1019.42 0.02 0.04) MeV Gf ( 4.21 0.03
0.02 ) MeV
CMD2 collaboration PLB605, 26 (2005)
BR(f ?hg) (1.373 0.014 0.085)? 10-2 BR(f
?p0g) (1.258 0.037 0.077)? 10-3
46
Nature of the scalar a0 a0(980)??p0
KLOE 2000 data (2 107 f) PLB485,349 (2000)

• First observation in f hpg by SND (PLB 438,441)
• 395 pb-1 at ? peak 10 pb-1
• 1) ???? (39.43) 5 ? final state
  2.2 ? 104 events
• 2) ??pp-p0 (22.6) pp- 5 ?
  4180 events
• Fit the two spectra simultaneously

????
??pp-p0
47
p0p0g Looking for f0 ?pp-
First observation SND of f p0p0g 1998 Br(f f0g)
(3.42 0.30 0.36)10-4
Data- fit comparison (on projections)
Residuals vs. DP position
KLOE preliminary
Kaon-loop fit 1. VDM part still not perfect (see
residuals) 2. Scalar part ok BUT f0(600) is
needed p(c2) 10-4 ? 30 ! 3.
f0(980) parameters agree with pp-g analysis
again R gt 1 (gfKK gt gf pp-).
M(pp) MEV
48

• CP Test in flavour conserving processes
• SM predictions small ? signature of New Physics
  beyond SM
• JPC 0-
• h? pp- e e - CP
  asymmetry between pp and ee planes (as KL)
• CMD-2 3.8 2.5 1.3 0.3
• ? pp- P,CP (large
  background in hadron production)
• h? 4p0 P,CP 4
  (background free)
• C Test not extensively studied in em and strong
  interactions
• ? ggg h ? ppg h ? pppg C
• ? p0 ee-, h ? p0 mm-, if pg
• SM via pgg BR 3 10-9

49
KS physics
KS ?gg BR changed along the years Measurement of
Na48 (2.78 ?0.07) 10-6 (relevant bkg from KL
?gg) differs for cPT O(p4) by 30, useful to fix
O(p6) counterterm

• Ks ? p p-p0
  Test of cpt

50
CPT KS semileptonic decays
Sensitivity to CPT violating effects through
charge asymmetry AS
KLOE
Test of the DS DQ rule, G(KS ? pen)/G(KL ?
pen) 1 4 Re(x ) FISRT OBSERVATION CMD-2
BR(Ks ? pen ) (7.2 1.4) ? 10-4 KLOE BR(KS ?
pen) (7.09 ? 0.08stat ? 0.05syst) 10-4
AS (-2 ? 9stat ? 5syst) 10-3
AL (3322 ? 58 ? 47) 10-6 Re(x) (0.6
? 3.1stat ? 1.8syst) 10-3
51
(No Transcript)
52
pp-g Looking for f0 ?pp-
First observation CMD-2 of f? pp-g
PLB462,371(1999)
M(pp) MeV
KLOE evidence of f0 in charge asymmetry

• data
• MC ISRFSR
• MC ISRFSR
• f0(KL)

f0 more coupled to kaons than to pions
M(pp) MeV
53
p0p0g Looking for f0 ?p0p0
First observation SND in f ?p0p0g PLB 440,442
(1998) SND BR(f ? p0p0g )
(1.14 ? 0.10 ? 0.12)10-4
CMD?2 PLB463,380 (1999) BR(f ? p0p0g )(0.92
? 0.08 ? 0.06)10-4 SND PLB485,349 (2000) (2
?107 f) BR(f ? p0p0g ) (1.221 ?
0.098 ? 0.061) ?10-4
KLOE 17 pb-1 00 data Nev 2438 ? 61
Mpp (MeV)

• Fit to the Mpp spectrum, contribution from
• f ? f0g
• f ? sg
• strong negative f0?s interference
• negligible contrib. from f ? r0p0 ?p0p0g

KLOE PLB537,21 (2002) (5 ? 107 f) BR(f ? p0p0g
)(1.09 ? 0.03stat ? .05syst)10?4
M(pp) MEV
54
p0hg Looking for a0(980)??p0
First observation in f? hpg by SND PLB
438,441 CMD-2 PLB462,380 (1999) BR(f ? hp0g )
(0.90 ? 0.24stat ?0.10syst) ?104
first observation

• KLOE PLB536,209 (2002) 16 pb1 00 data
• BR(f ? hp0g ) (8.5 ? 0.5stat ?0.6syst) ?105
• New data (statistics x 20)

????
55
Zweig rule decay f ? KK prefered dispite of the
phase sapce, because consttitunent qurks have to
survive f ss
56

• f? f0(980)g ? pp-g
• ? p0p0g
• ? KK-g 2m(K)m(f0)m(f) ? expected BR
  10-6
• ? K0K0g 10-8
• f ? a0(980)g ? hp0g
• ? KK-g ?
  expected BR 10-6
• ? K0K0g ?
  expected BR 10-8