Measurement of the Decay $\Upsilon^\prime \to \Upsilon \pi^+ \pi^-$

Niczyporuk, B.; Zeludziewicz, T.; Chen, K.W.; Hartung, R.; Folger, G.; Lurz, B.; Vogel, H.; Volland, U.; Wegener, H.; Bienlein, J.K.

doi:10.1016/0370-2693(81)90295-1

Measurement of the Decay $\Upsilon^\prime \to \Upsilon \pi^+ \pi^-$

LENA

Collaboration

•

B. Niczyporuk
(
- Cracow, INP
)

Dec, 1980

6 pages

Published in:

Phys.Lett.B 100 (1981) 95-100

Published: 1981

DOI:

10.1016/0370-2693(81)90295-1

PDG:

{{\mathit \Upsilon}{(2S)}}

\rightarrow

{{\mathit \Upsilon}{(1S)}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Report number:

DESY-80-125

Experiments:

DESY-DORIS-LENA

reference search59 citations

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Abstract: (Elsevier)

We report the first observation of the decay ϒ′→ϒπ + π − → l + l − π + π − . The 7 events seen yield a branching ratio B ( ϒ ′→ ϒπ + π − )=(19±8)%. A consistent value of B =(26±13)% is obtained from the charged multiplicities of the ϒ′ and ϒ decays. Using these values we deduce Γ tot ( ϒ ′)=(31 +10 −8 ) keV and B ee ( ϒ ′)=(1.8±0.5)%. Furthermore we estimate Γ ( ϒ ′→gg ϒ )=(10±5) keV in agreement with QCD predictions using vector gluons while one would expect 100 keV with scalar gluons.

ELECTRON POSITRON: COLLIDING BEAMS
COLLIDING BEAMS: ELECTRON POSITRON
ELECTRON POSITRON: ANNIHILATION
ANNIHILATION: ELECTRON POSITRON
UPSILON(10020): ELECTROPRODUCTION
ELECTROPRODUCTION: UPSILON(10020)
UPSILON(10020): HADRONIC DECAY
HADRONIC DECAY: UPSILON(10020)
UPSILON(10020): BRANCHING RATIO
CHARGED PARTICLE: MULTIPLICITY

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