CP violation in hyperon and charged kaon decays

The primary purpose of the HyperCP experiment at Fermilab is to test CP in hyperon decays by comparing the decay distributions for Ⅺ− (“cascade”) decays in the decay sequence: Ⅺ− → π− + Λ0, Λ0 → π− + p, with those for the antiparticle Ⅺ̄+. In addition, we can test CP in charged kaon decays by comparing the slopes of the Dalitz plot for Κ+ and Κ− decays. We are also looking at rare decay modes of charged kaons and hyperons, particularly those involving muons. In two runs in 1997 and 1999, we collected approx. 500 millon charged kaon decays, 2.5 billion Ⅺ− and Ⅺ̄+ decays, and 19 million Ω− and Ω̄+ decays. This is the largest sample of fully reconstructed particle decays ever collected.

talk: Fort Lauderdale 2001/12/12
CP: violation
hyperon: hadronic decay
K: hadronic decay
Dalitz plot: slope
hyperon: rare decay
K: rare decay
angular distribution
magnetic spectrometer
experimental results

References(8)

Figures(0)

The big flow

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- AIP Conf.Proc. 624 (2002) 1, 69-75
•
e-Print:
- astro-ph/0112072
•
DOI:
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Review of particle physics. Particle Data Group

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Observation of the Decay $K^- \to \pi^- \mu^+ \mu^-$ and Measurements of the Branching Ratios for $K^{\pm} \to \pi^{\pm} \mu^+ \mu^-$

HyperCP

Collaboration

•

H.K. Park
(
- Michigan U.
)

et al.

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•
e-Print:
- hep-ex/0110033
•
DOI:
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CP violation in hyperon decays

Xiao-Gang He
(
- Taiwan, Natl. Taiwan U.
)

- Frascati Phys.Ser. 26 (2001) 459-467
•
e-Print:
- hep-ph/0108164

CP violation in hyperon decays

S. Pakvasa
(
- Hawaii U.
)

Search for direct CP violation in nonleptonic decays of charged Xi and Lambda hyperons

E756

Collaboration

•

K.B. Luk
(
- LBL, Berkeley and
- UC, Berkeley
)

et al.

- Phys.Rev.Lett. 85 (2000) 4860-4863
•
e-Print:
- hep-ex/0007030
•
DOI:
- 10.1103/PhysRevLett.85.4860

CP violation in K+- ---> 3 pi decays and lattice QCD B factors

Gino Isidori
(
- Rome U. and
- INFN, Rome
)
,
Luciano Maiani
(
- Rome U. and
- INFN, Rome
)
,
Alessandra Pugliese
(
- Rome U. and
- INFN, Rome
)

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e-Print:
- hep-ph/9305333
•
DOI:
- 10.1016/0370-2693(93)90367-Q