Observation of the Decay K+ → π+γγ

P. Kitching; T. Nakano; M. Rozon; R. Soluk; S. Adler; M. S. Atiya; I. H. Chiang; J. S. Frank; J. S. Haggerty; T. F. Kycia; K. K. Li; L. S. Littenberg; A. Sambamurti; A. Stevens; R. C. Strand; C. Witzig; W. C. Louis; D. S. Akerib; M. Ardebili; M. Convery; M. M. Ito; D. R. Marlow; R. A. McPherson; P. D. Meyers; M. A. Selen; F. C. Shoemaker; A. J.S. Smith; E. W. Blackmore; D. A. Bryman; L. Felawka; A. Konaka; Y. Kuno; J. A. Macdonald; T. Numao; P. Padley; J. M. Poutissou; R. Poutissou; J. Roy; A. S. Turcot

doi:10.1103/PhysRevLett.79.4079

Observation of the Decay K⁺ → π⁺γγ

P. Kitching, T. Nakano, M. Rozon, R. Soluk, S. Adler, M. S. Atiya, I. H. Chiang, J. S. Frank, J. S. Haggerty, T. F. Kycia, K. K. Li, L. S. Littenberg, A. Sambamurti, A. Stevens, R. C. Strand, C. Witzig, W. C. Louis, D. S. Akerib, M. Ardebili, M. ConveryM. M. Ito, D. R. Marlow, R. A. McPherson, P. D. Meyers, M. A. Selen, F. C. Shoemaker, A. J.S. Smith, E. W. Blackmore, D. A. Bryman, L. Felawka, A. Konaka, Y. Kuno, J. A. Macdonald, T. Numao, P. Padley, J. M. Poutissou, R. Poutissou, J. Roy, A. S. Turcot

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Abstract

The first observation of the decay K⁺ → π⁺γγ is reported. A total of 31 events was observed with an estimated background of 5.1 ± 3.3. events in the π⁺ momentum range from 100 to 180 MeV/c. The corresponding partial branching ratio, B(K⁺ → π⁺γγ, 100 MeV/c < P_π+ < 180 MeV/c), is [6.0 ± 1.5(stat) ± 0.7(stat) × 10⁻⁷. No K⁺ → π⁺γγ decay was observed in the π⁺ momentum region greater than 215 MeV/c. The observed π⁺ momentum spectrum is compared with the predictions of chiral perturbation theory.

Original language	English (US)
Pages (from-to)	4079-4082
Number of pages	4
Journal	Physical review letters
Volume	79
Issue number	21
DOIs	https://doi.org/10.1103/PhysRevLett.79.4079
State	Published - Nov 24 1997

All Science Journal Classification (ASJC) codes

General Physics and Astronomy

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10.1103/PhysRevLett.79.4079

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Kitching, P., Nakano, T., Rozon, M., Soluk, R., Adler, S., Atiya, M. S., Chiang, I. H., Frank, J. S., Haggerty, J. S., Kycia, T. F., Li, K. K., Littenberg, L. S., Sambamurti, A., Stevens, A., Strand, R. C., Witzig, C., Louis, W. C., Akerib, D. S., Ardebili, M., ... Turcot, A. S. (1997). Observation of the Decay K⁺ → π⁺γγ. Physical review letters, 79(21), 4079-4082. https://doi.org/10.1103/PhysRevLett.79.4079

@article{f3737e7b8c7b4a999bd4708719c1cec9,

title = "Observation of the Decay K+ → π+γγ",

abstract = "The first observation of the decay K+ → π+γγ is reported. A total of 31 events was observed with an estimated background of 5.1 ± 3.3. events in the π+ momentum range from 100 to 180 MeV/c. The corresponding partial branching ratio, B(K+ → π+γγ, 100 MeV/c < Pπ+ < 180 MeV/c), is [6.0 ± 1.5(stat) ± 0.7(stat) × 10−7. No K+ → π+γγ decay was observed in the π+ momentum region greater than 215 MeV/c. The observed π+ momentum spectrum is compared with the predictions of chiral perturbation theory.",

author = "P. Kitching and T. Nakano and M. Rozon and R. Soluk and S. Adler and Atiya, {M. S.} and Chiang, {I. H.} and Frank, {J. S.} and Haggerty, {J. S.} and Kycia, {T. F.} and Li, {K. K.} and Littenberg, {L. S.} and A. Sambamurti and A. Stevens and Strand, {R. C.} and C. Witzig and Louis, {W. C.} and Akerib, {D. S.} and M. Ardebili and M. Convery and Ito, {M. M.} and Marlow, {D. R.} and McPherson, {R. A.} and Meyers, {P. D.} and Selen, {M. A.} and Shoemaker, {F. C.} and Smith, {A. J.S.} and Blackmore, {E. W.} and Bryman, {D. A.} and L. Felawka and A. Konaka and Y. Kuno and Macdonald, {J. A.} and T. Numao and P. Padley and Poutissou, {J. M.} and R. Poutissou and J. Roy and Turcot, {A. S.}",

year = "1997",

month = nov,

day = "24",

doi = "10.1103/PhysRevLett.79.4079",

language = "English (US)",

volume = "79",

pages = "4079--4082",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Kitching, P, Nakano, T, Rozon, M, Soluk, R, Adler, S, Atiya, MS, Chiang, IH, Frank, JS, Haggerty, JS, Kycia, TF, Li, KK, Littenberg, LS, Sambamurti, A, Stevens, A, Strand, RC, Witzig, C, Louis, WC, Akerib, DS, Ardebili, M, Convery, M, Ito, MM, Marlow, DR, McPherson, RA, Meyers, PD, Selen, MA, Shoemaker, FC, Smith, AJS, Blackmore, EW, Bryman, DA, Felawka, L, Konaka, A, Kuno, Y, Macdonald, JA, Numao, T, Padley, P, Poutissou, JM, Poutissou, R, Roy, J & Turcot, AS 1997, 'Observation of the Decay K⁺ → π⁺γγ', Physical review letters, vol. 79, no. 21, pp. 4079-4082. https://doi.org/10.1103/PhysRevLett.79.4079

TY - JOUR

T1 - Observation of the Decay K+ → π+γγ

AU - Kitching, P.

AU - Nakano, T.

AU - Rozon, M.

AU - Soluk, R.

AU - Adler, S.

AU - Atiya, M. S.

AU - Chiang, I. H.

AU - Frank, J. S.

AU - Haggerty, J. S.

AU - Kycia, T. F.

AU - Li, K. K.

AU - Littenberg, L. S.

AU - Sambamurti, A.

AU - Stevens, A.

AU - Strand, R. C.

AU - Witzig, C.

AU - Louis, W. C.

AU - Akerib, D. S.

AU - Ardebili, M.

AU - Convery, M.

AU - Ito, M. M.

AU - Marlow, D. R.

AU - McPherson, R. A.

AU - Meyers, P. D.

AU - Selen, M. A.

AU - Shoemaker, F. C.

AU - Smith, A. J.S.

AU - Blackmore, E. W.

AU - Bryman, D. A.

AU - Felawka, L.

AU - Konaka, A.

AU - Kuno, Y.

AU - Macdonald, J. A.

AU - Numao, T.

AU - Padley, P.

AU - Poutissou, J. M.

AU - Poutissou, R.

AU - Roy, J.

AU - Turcot, A. S.

PY - 1997/11/24

Y1 - 1997/11/24

N2 - The first observation of the decay K+ → π+γγ is reported. A total of 31 events was observed with an estimated background of 5.1 ± 3.3. events in the π+ momentum range from 100 to 180 MeV/c. The corresponding partial branching ratio, B(K+ → π+γγ, 100 MeV/c < Pπ+ < 180 MeV/c), is [6.0 ± 1.5(stat) ± 0.7(stat) × 10−7. No K+ → π+γγ decay was observed in the π+ momentum region greater than 215 MeV/c. The observed π+ momentum spectrum is compared with the predictions of chiral perturbation theory.

AB - The first observation of the decay K+ → π+γγ is reported. A total of 31 events was observed with an estimated background of 5.1 ± 3.3. events in the π+ momentum range from 100 to 180 MeV/c. The corresponding partial branching ratio, B(K+ → π+γγ, 100 MeV/c < Pπ+ < 180 MeV/c), is [6.0 ± 1.5(stat) ± 0.7(stat) × 10−7. No K+ → π+γγ decay was observed in the π+ momentum region greater than 215 MeV/c. The observed π+ momentum spectrum is compared with the predictions of chiral perturbation theory.

UR - http://www.scopus.com/inward/record.url?scp=4243596312&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=4243596312&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.79.4079

DO - 10.1103/PhysRevLett.79.4079

M3 - Article

AN - SCOPUS:4243596312

SN - 0031-9007

VL - 79

SP - 4079

EP - 4082

JO - Physical review letters

JF - Physical review letters

IS - 21

ER -

Observation of the Decay K⁺ → π⁺γγ

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