Improved limit on the rate of the decay K+→π+μ+e−

R. Appel; G. S. Atoyan; B. Bassalleck; D. R. Bergman; D. N. Brown; N. Cheung; S. Dhawan; H. Do; J. Egger; S. Eilerts; C. Felder; H. Fischer; M. Gach; W. Herold; V. V. Issakov; H. Kaspar; D. E. Kraus; D. M. Lazarus; L. Leipuner; P. Lichard; J. Lowe; J. Lozano; H. Ma; W. Majid; W. Menzel; S. Pislak; A. A. Poblaguev; V. E. Postoev; A. L. Proskurjakov; P. Rehak; P. Robmann; A. Sher; J. A. Thompson; P. Truöl; H. Weyer; M. E. Zeller

doi:10.1103/PhysRevLett.85.2450

Improved limit on the rate of the decay K⁺→π⁺μ⁺e⁻

R. Appel, G. S. Atoyan, B. Bassalleck, D. R. Bergman, D. N. Brown, N. Cheung, S. Dhawan, H. Do, J. Egger, S. Eilerts, C. Felder, H. Fischer, M. Gach, W. Herold, V. V. Issakov, H. Kaspar, D. E. Kraus, D. M. Lazarus, L. Leipuner, P. LichardJ. Lowe, J. Lozano, H. Ma, W. Majid, W. Menzel, S. Pislak, A. A. Poblaguev, V. E. Postoev, A. L. Proskurjakov, P. Rehak, P. Robmann, A. Sher, J. A. Thompson, P. Truöl, H. Weyer, M. E. Zeller

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Abstract

We report results of a search for the lepton-family number violating decay K⁺→π⁺μ⁺e⁻ from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9×10⁻¹¹ (90% C.L.). Together with results based on data collected in 1995 and an earlier experiment, E777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8×10⁻¹¹. We also report a new upper limit on the branching ratio for π0→μ⁺e⁻ of3.8 × 10⁻¹⁰ (90% C.L.).

Original language	English
Pages (from-to)	2450-2453
Number of pages	4
Journal	Physical Review Letters
Volume	85
Issue number	12
DOIs	https://doi.org/10.1103/PhysRevLett.85.2450
State	Published - Sep 18 2000

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Appel, R., Atoyan, G. S., Bassalleck, B., Bergman, D. R., Brown, D. N., Cheung, N., Dhawan, S., Do, H., Egger, J., Eilerts, S., Felder, C., Fischer, H., Gach, M., Herold, W., Issakov, V. V., Kaspar, H., Kraus, D. E., Lazarus, D. M., Leipuner, L., ... Zeller, M. E. (2000). Improved limit on the rate of the decay K⁺→π⁺μ⁺e⁻. Physical Review Letters, 85(12), 2450-2453. https://doi.org/10.1103/PhysRevLett.85.2450

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title = "Improved limit on the rate of the decay K+→π+μ+e−",

abstract = "We report results of a search for the lepton-family number violating decay K+→π+μ+e− from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9×10−11 (90% C.L.). Together with results based on data collected in 1995 and an earlier experiment, E777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8×10−11. We also report a new upper limit on the branching ratio for π0→μ+e− of3.8 × 10−10 (90% C.L.).",

author = "R. Appel and Atoyan, {G. S.} and B. Bassalleck and Bergman, {D. R.} and Brown, {D. N.} and N. Cheung and S. Dhawan and H. Do and J. Egger and S. Eilerts and C. Felder and H. Fischer and M. Gach and W. Herold and Issakov, {V. V.} and H. Kaspar and Kraus, {D. E.} and Lazarus, {D. M.} and L. Leipuner and P. Lichard and J. Lowe and J. Lozano and H. Ma and W. Majid and W. Menzel and S. Pislak and Poblaguev, {A. A.} and Postoev, {V. E.} and Proskurjakov, {A. L.} and P. Rehak and P. Robmann and A. Sher and Thompson, {J. A.} and P. Tru{\"o}l and H. Weyer and Zeller, {M. E.}",

year = "2000",

month = sep,

day = "18",

doi = "10.1103/PhysRevLett.85.2450",

language = "English",

volume = "85",

pages = "2450--2453",

journal = "Physical Review Letters",

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Appel, R, Atoyan, GS, Bassalleck, B, Bergman, DR, Brown, DN, Cheung, N, Dhawan, S, Do, H, Egger, J, Eilerts, S, Felder, C, Fischer, H, Gach, M, Herold, W, Issakov, VV, Kaspar, H, Kraus, DE, Lazarus, DM, Leipuner, L, Lichard, P, Lowe, J, Lozano, J, Ma, H, Majid, W, Menzel, W, Pislak, S, Poblaguev, AA, Postoev, VE, Proskurjakov, AL, Rehak, P, Robmann, P, Sher, A, Thompson, JA, Truöl, P, Weyer, H & Zeller, ME 2000, 'Improved limit on the rate of the decay K⁺→π⁺μ⁺e⁻', Physical Review Letters, vol. 85, no. 12, pp. 2450-2453. https://doi.org/10.1103/PhysRevLett.85.2450

TY - JOUR

T1 - Improved limit on the rate of the decay K+→π+μ+e−

AU - Appel, R.

AU - Atoyan, G. S.

AU - Bassalleck, B.

AU - Bergman, D. R.

AU - Brown, D. N.

AU - Cheung, N.

AU - Dhawan, S.

AU - Do, H.

AU - Egger, J.

AU - Eilerts, S.

AU - Felder, C.

AU - Fischer, H.

AU - Gach, M.

AU - Herold, W.

AU - Issakov, V. V.

AU - Kaspar, H.

AU - Kraus, D. E.

AU - Lazarus, D. M.

AU - Leipuner, L.

AU - Lichard, P.

AU - Lowe, J.

AU - Lozano, J.

AU - Ma, H.

AU - Majid, W.

AU - Menzel, W.

AU - Pislak, S.

AU - Poblaguev, A. A.

AU - Postoev, V. E.

AU - Proskurjakov, A. L.

AU - Rehak, P.

AU - Robmann, P.

AU - Sher, A.

AU - Thompson, J. A.

AU - Truöl, P.

AU - Weyer, H.

AU - Zeller, M. E.

PY - 2000/9/18

Y1 - 2000/9/18

N2 - We report results of a search for the lepton-family number violating decay K+→π+μ+e− from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9×10−11 (90% C.L.). Together with results based on data collected in 1995 and an earlier experiment, E777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8×10−11. We also report a new upper limit on the branching ratio for π0→μ+e− of3.8 × 10−10 (90% C.L.).

AB - We report results of a search for the lepton-family number violating decay K+→π+μ+e− from data collected by experiment E865 in 1996 at the Alternating Gradient Synchroton of Brookhaven National Laboratory. We place an upper limit on the branching ratio at 3.9×10−11 (90% C.L.). Together with results based on data collected in 1995 and an earlier experiment, E777, this result establishes a combined 90% confidence level upper limit on the branching ratio at 2.8×10−11. We also report a new upper limit on the branching ratio for π0→μ+e− of3.8 × 10−10 (90% C.L.).

UR - http://www.scopus.com/inward/record.url?scp=0034683337&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.85.2450

DO - 10.1103/PhysRevLett.85.2450

M3 - Article

C2 - 10978079

AN - SCOPUS:0034683337

SN - 0031-9007

VL - 85

SP - 2450

EP - 2453

JO - Physical Review Letters

JF - Physical Review Letters

IS - 12

ER -

Improved limit on the rate of the decay K⁺→π⁺μ⁺e⁻

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