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Featured researches published by J. Roy.


Physical Review Letters | 1997

OBSERVATION OF THE DECAY K+ PI + GAMMA GAMMA

P. Kitching; Tomoyuki Nakano; M. Rozon; R. Soluk; Stephen L. 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. R. Convery; M. M. Ito; D. Marlow; Robert McPherson; P. D. Meyers; M. Selen; F. C. Shoemaker; A. J. S. Smith; E. W. Blackmore; D. A. Bryman; L. Felawka

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


Physical Review Letters | 1997

Observation of the decay K+ ---> pi+ mu+ mu-

Stephen L. Adler; 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. R. Convery; M. M. Ito; D. Marlow; Robert McPherson; P. D. Meyers; Selen; F. C. Shoemaker; A. J. S. Smith; E. W. Blackmore; D. A. Bryman; L. Felawka; A. Konaka; Y. Kuno; James MacDonald; T. Numao

We have observed the rare decay K+ --> pi+ mu+ mu- and measured the branching ratio Gamma(K+ --> pi+ mu+ mu-)/Gamma(K+ --> all) = (5.0 +/- 0.4 (stat.) +/- 0.7 (sys.) +/- 0.6 (theor.)) x 10^{-8}. We compare this result with predictions from chiral perturbation theory and estimates based on the decay K+ --> pi+ e+ e-.


Physical Review Letters | 1996

Search for the decay K+--> pi + nu nu -bar.

Stephen L. 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. R. Convery; M. M. Ito; D. Marlow; Robert McPherson; P. D. Meyers; M. Selen; F. C. Shoemaker; A. J. S. Smith; E. W. Blackmore; D. A. Bryman; L. Felawka; P. Kitching; A. Konaka; V. A. Kujala; Y. Kuno

An upper limit on the branching ratio for the decay


Physical Review Letters | 1989

Search for a light Higgs boson in the decay K+--> pi +H, H--> micro+ micro-

M. S. Atiya; I-H. Chiang; J. S. Frank; J. S. Haggerty; M. M. Ito; T. F. Kycia; K. K. Li; L. S. Littenberg; A. Stevens; R. C. Strand; W. C. Louis; D. S. Akerib; Michael Hildreth; D. Marlow; P. D. Meyers; M. A. Selen; F. C. Shoemaker; A. J. S. Smith; G. Azuelos; E. W. Blackmore; D. A. Bryman; L. Felawka; P. Kitching; Y. Kuno; James MacDonald; T. Numao; P. Padley; J.-M. Poutissou; R. Poutissou; J. Roy

K^+ ! rightarrow ! pi^+ nu overline{nu}


Physical Review Letters | 1993

Search for the decay [ital K][sup +][r arrow][pi][sup +][nu][bar [nu]]

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

is set at


Physical Review Letters | 1992

Search for the decay K+ ---> pi+ neutrino anti-neutrino

Atiya; A. Stevens; A. Konaka; Andre Spence Turcot; M. M. Ito; J. S. Haggerty; Y. Kuno; A. J. S. Smith; L. S. Littenberg; L. Felawka; P. Kitching; A. Sambamurti; Daniel Marlow; R. C. Strand; B.Paul Padley; T. F. Kycia; D. S. Akerib; J. Roy; W. C. Louis; Selen; P. D. Meyers; R. Soluk; James MacDonald; J. S. Frank; F. C. Shoemaker; K. K. Li; J.-M. Poutissou; I-H. Chiang; T. Numao; E. W. Blackmore

2.4 times 10^{-9}


Physical Review Letters | 1997

Observation of the decay K+ → π+ μ+ μ−

P. Kitching; T. Nakano; M. Rozon; R. Soluk; S. 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. R. Convery; Masaharu Ito; D. 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

at the 90% C.L. using pions in the kinematic region


Physical Review Letters | 1991

Upper limit on the branching ratio for the decay pi 0--> nu nu -bar.

M. S. Atiya; I-H. Chiang; J. S. Frank; J. S. Haggerty; M. M. Ito; T. F. Kycia; K. K. Li; L. S. Littenberg; A. Stevens; R. C. Strand; W. C. Louis; D. S. Akerib; D. Marlow; P. D. Meyers; M. Selen; F. C. Shoemaker; A. J. S. Smith; G. Azuelos; E. W. Blackmore; D. A. Bryman; L. Felawka; P. Kitching; Y. Kuno; James MacDonald; T. Numao; P. Padley; J.-M. Poutissou; R. Poutissou; J. Roy

214~{rm MeV}/c 0


Intersections between particle and nuclear physics | 2008

Recent results on rare K+ decays from BNL E787

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; W. C. Louis; D. S. Akerib; Masaharu Ito; D. Marlow; P. D. Meyers; M. A. Selen; F. C. Shoemaker; A. J. S. Smith; E. W. Blackmore; D. A. Bryman; L. Felawka; P. Kitching; A. Konaka; Y. Kuno; J. A. Macdonald; Toshio Numao; P. Padley; J.-M. Poutissou; R. Poutissou; J. Roy

.


Physical Review D | 1998

Upper Limit on the Decay K+ --> e+ nu mu+ mu-

Stephen L. 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. R. Convery; M. M. Ito; D. Marlow; Robert McPherson; P. D. Meyers; M. Selen; F. C. Shoemaker; A. J. S. Smith; E. W. Blackmore; D. A. Bryman; L. Felawka; A. Konaka; Y. Kuno; James MacDonald; T. Numao

An upper limit on the branching ratio of the decay {ital K}{sup +}{r arrow}{pi}{sup +}H, {ital H}{r arrow}{mu}{sup +}{mu}{sup {minus}} is set at 1.5{times}10{sup {minus}7} at the 90% confidence level, for a Higgs-boson mass in the interval 220{lt}{ital m}{sub {ital H}}{lt}320 MeV/{ital c}{sup 2}. In addition, 90%-confidence-level upper limits on the branching ratios of the decays {ital K}{sup +}{r arrow}{pi}{sup +}{mu}{sup +}{mu}{sup {minus}} and {ital K}{sup +}{r arrow}{mu}{sup +}{nu}{mu}{sup +}{mu}{sup {minus}} are set at 2.3{times}10{sup {minus}7} and 4.1{times}10{sup {minus}7}, respectively.

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A. Stevens

Brookhaven National Laboratory

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J. S. Frank

Brookhaven National Laboratory

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R. C. Strand

Brookhaven National Laboratory

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T. F. Kycia

Brookhaven National Laboratory

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D. S. Akerib

Case Western Reserve University

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K. K. Li

Brookhaven National Laboratory

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W. C. Louis

Los Alamos National Laboratory

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