Measurement of the branching fraction of the decay K(L) ---&gt; pi+ pi- e+ e-

Adams, J.

doi:10.1103/PhysRevLett.80.4123

Measurement of the branching fraction of the decay K(L) ---> pi+ pi- e+ e-

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Phys.Rev.Lett.

DOI:https://doi.org/10.1103/PhysRevLett.80.4123· OSTI ID:1847774

Adams, J.

We report the first branching fraction measurement of the decay KL→π+π-e+e-. With a sample of 46 candidates, and an expected background level of 9.4 events, the branching fraction is determined to be B(KL→π+π-e+e-)=[3.2±0.6(stat)±0.4(syst)]×10-7. This measurement was carried out as part of the Fermilab KTeV (E799-II) experiment and is in good agreement with the expectations from the mechanisms of direct emission and inner bremsstrahlung.

Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

Contributing Organization:: KTeV

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1847774

Report Number(s):: FERMILAB-PUB-98-058-E; oai:inspirehep.net:467665

Journal Information:: Phys.Rev.Lett., Journal Name: Phys.Rev.Lett. Vol. 80

Country of Publication:: United States

Language:: English

References (11)

Experimental search for the decay mode KL → π+π−e+e− Nomura, T.; Hemmi, Y.; Kurashige, H. Physics Letters B, Vol. 408, Issue 1-4 https://doi.org/10.1016/S0370-2693(97)00897-6	journal	September 1997
K 2 0 Decay Luers, D.; Mittra, I. S.; Willis, W. J. Physical Review, Vol. 133, Issue 5B https://doi.org/10.1103/PhysRev.133.B1276	journal	March 1964
Direct and indirect CP violation in the decay K L → π + π − e + e − Heiliger, P.; Sehgal, L. M. Physical Review D, Vol. 48, Issue 9 https://doi.org/10.1103/PhysRevD.48.4146	journal	November 1993
Observation of the Dalitz Decay Modes of the K L 0 Carroll, A. S.; Chiang, I. -H.; Kycia, T. F. Physical Review Letters, Vol. 44, Issue 8 https://doi.org/10.1103/PhysRevLett.44.525	journal	February 1980
Simultaneous measurement of K S and K L decays into π + π − γ Ramberg, E.; Bock, G. J.; Coleman, R. Physical Review Letters, Vol. 70, Issue 17 https://doi.org/10.1103/PhysRevLett.70.2525	journal	April 1993
Erratum: K L → π + π − e + e − Elwood, John K.; Wise, Mark B.; Savage, Martin J. Physical Review D, Vol. 53, Issue 5 https://doi.org/10.1103/PhysRevD.53.2855	journal	March 1996
CP violation in the decay K L → π + π − e + e − Sehgal, L. M.; Wanninger, M. Physical Review D, Vol. 46, Issue 3 https://doi.org/10.1103/PhysRevD.46.1035	journal	August 1992
K L → π + π − e + e − Elwood, John K.; Wise, Mark B.; Savage, Martin J. Physical Review D, Vol. 52, Issue 9 https://doi.org/10.1103/PhysRevD.52.5095	journal	November 1995
Review of Particle Physics Barnett, R. M.; Carone, C. D.; Groom, D. E. Physical Review D, Vol. 54, Issue 1 https://doi.org/10.1103/PhysRevD.54.1	journal	July 1996
Final-state interactions and CP violation in K L → π + π − e + e − Elwood, John K.; Wise, Mark B.; Savage, Martin J. Physical Review D, Vol. 53, Issue 7 https://doi.org/10.1103/PhysRevD.53.4078	journal	April 1996
Erratum: CP violation in the decay K L → π + π − e + e − Sehgal, L. M.; Wanninger, M. Physical Review D, Vol. 46, Issue 11 https://doi.org/10.1103/PhysRevD.46.5209.3	journal	December 1992

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