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Misura di R. Importanza di R QED (M Z ) (g-2) Test di CVC nei decadimenti del Regole di somma di QCD e S.

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Presentation on theme: "Misura di R. Importanza di R QED (M Z ) (g-2) Test di CVC nei decadimenti del Regole di somma di QCD e S."— Presentation transcript:

1 Misura di R

2 Importanza di R QED (M Z ) (g-2) Test di CVC nei decadimenti del Regole di somma di QCD e S

3 Hadronic contributions to a had (+ ) (+J/, ) (+, )2 > 4 (+KK) < 1.8 GeV a had 2 [ a had ] <1.8 GeV 1% Calculations based on Davier, Eidelman, Höcker, Zhang e+e- data only! 2 contrib. a had 8% [2m p GeV] 54% [ GeV] 10% [Rest<1.8 GeV] r 2 contrib. a had 8% [2m p GeV] 34% [ GeV] 31% [Rest< 1.8 GeV] > 1GeV r

4 Contribution to had from F. Jegerlehner

5 Comparison of different evaluations of had had MethodRef data<12 GeVS.Eidelman F.Jegerlehner data<1.8 GeVJ.H.Kuhen, M.Steinhauser data<1.8GeVM.Davier, A.Höcker Euclidean>2.5 GeVF.Jegerlehener scaled data, pQCD , 5- A.D.Martin et al data<12 GeV (new data CMD2 & BES) F.Jegerlehner data<12 GeV (new data CMD2 & BES) H.Burkhardt,B.Pietrzyk 01 ( 05) ( ) up to J/ up to )

6 magnitudeerrors Burkhardt & Pietrzyk 2001 Contributions to had Including KLOE results, a preliminary analysis of B.& P. found a value of (5) (m Z 2 ) which confirms their 2001 estimate: (5) (m Z 2 ) = ±

7 Results on R from scan at s<12 GeV PlaceRingDetectorE cm (GeV)ptsYear NovosibirskVEPP-2M VEPP-2 CMD2,SND Olya,ND,CMD < BeijingBEPCBESII OrsayDCIM3N,DMI,DM FrascatiAdone 2,MEA, Boson,BCF SLACSpearMarkI HamburgDorisDASP PLUTO C.Ball LENA , NovosibirskVEPP-4MD

8 Recent Results from… <1.4CMD2,SNDVEPP-2MNovosibirsk 05, … <10 Gev (via ISR) ( GeV) Babar PEPIISLAC 05<1 (via ISR)KLOE DA NE Frascati YearptsE cm (GeV)DetectorRingPlace Future Projects or Upgrades PlaceRingDetectorE cm (GeV)ptsYear NovosibirskVEPP-2000Upgrades of CMD2 and SND <2 08? BeijingBEPCIIBESIII2-5 06? CornellCESRCLEO-C3-505

9 Data at 95

10 Data at 05

11 After 95 main results were published from CMD2 and and 1)VEPP-2M, Novosibirsk (exclusive measurements) 0.4

12 BES: 4 E cm L L Luminosity (nb -1 ) 2( + - )

13 1)KLOE: – e + e with syst ~1.3% (0.35

14 Babar:

15 Babar: 4h

16 Babar: 6 3( + - ) 2( + - ) 0 0 Total systematic: ~6-8%Total systematic: ~11%

17 Babar: 2K4 2( + - )K + K - Total systematic: ~7%

18 Proiezione a 10 anni Con cosa deve essere competitiva una misura tra 10 anni? Babar... BES... VEPP Altro? La regione 1-2 GeV particolarmente interessante: lerrore attuale ( 15%) contribuisce con un 40% allerrore totale su had

19 Open issues Buco nella sezione durto multiadronica vicino a soglia p bar-b narrow vector meson resonance, with a mass M 1.87 GeV and a width MeV, consistent with an N bar-N bound state

20 Open issues Buco di FOCUS nella sezione durto dei 6 Babar conferma in entrambi i canali

21 Errore percentuale R/R Punti con errore ~3% dalla misura inclusiva di BES ZOOM PRL 84, 594 (2000) – PRL 88, (2002)


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