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studio degli stati di charmonio nel decadimento dei mesoni b in babar

studio degli stati di charmonio nel decadimento dei mesoni b in babar

studio degli stati di charmonio nel decadimento dei mesoni b in babar

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Charmonio 31<br />

Figura 1.20: Y(4260) vista da Belle.<br />

Collab. Mass Γ Γee × B(Y (4260) → π + π − J/ψ)<br />

(MeV/c 2 ) (MeV/c 2 ) (eV )<br />

BaBar 4259 ± 8 +2<br />

−6<br />

88 ± 23 +6<br />

−4<br />

5.5 ± 1.0 +0.8<br />

−0.7<br />

Cleo 4259 +17<br />

−16 ± 4 73 +39<br />

−25 ± 5 8.9 +3.9<br />

−3.1 ± 1.8<br />

Belle 4295 ± 10 +10<br />

−3 133 ± 26 +13<br />

−6<br />

8.7 ± 1.1 +0.3<br />

−0.9<br />

Average 4274 ± 12 102 ± 17 7.1 ± 1.1<br />

S-factor 2.0 1.1 1.2<br />

Tabella 1.3: Parametri <strong>di</strong> Y(4260) osservati <strong>in</strong> <strong>di</strong>fferenti esperimenti.

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