--- title: "Study of the Doubly Cabibbo Suppressed Decay D+ → φ K+ and the Singly Cabibbo Suppressed Decay D+s → φ K+ • CBPF Index" description: "CBPF INDEX is the system that tracks the scientific and technological output of CBPF. It lists the articles, books, technical reports and other publications of the whole CBPF community." canonical_url: "https://index.cbpf.br/en/publicacoes/6ad2a767639f62b11adbb6a2" locale: en meta: "og:description": "CBPF INDEX is the system that tracks the scientific and technological output of CBPF. It lists the articles, books, technical reports and other publications of the whole CBPF community." "og:image": "https://index.cbpf.br/_og/d/c_Item%2Ctitulo_~U3R1ZHkgb2YgdGhlIERvdWJseSBDYWJpYmJvIFN1cHByZXNzZWQgRGVjYXkgPG1hdGg-RCsg4oaSIM-GIEsrPC9tYXRoPiBhbmQgdGhlIFNpbmdseSBDYWJpYmJvIFN1cHByZXNzZWQgRGVjYXkgPG1hdGg-RCtzIOKGkiDPhiBLKzwvbWF0aD4%2Ctipo_Physics%2BNote%2Ccor_~I2E4MmMwMA%2Cautores_~Si4gZG9zIEFuam9zOyBldCBhbGlp%2Cdetalhe_1991%2Csecao_Publications%2Cp_Ii9lbi9wdWJsaWNhY29lcy82YWQyYTc2NzYzOWY2MmIxMWFkYmI2YTIi%2Cs_7heugIvp6bSQdMYC.png" "og:image:height": "600" "og:image:type": image/png "og:image:width": "1200" "og:title": "Study of the Doubly Cabibbo Suppressed Decay D+ → φ K+ and the Singly Cabibbo Suppressed Decay D+s → φ K+ • CBPF Index" "twitter:image": "https://index.cbpf.br/_og/d/c_Item%2Ctitulo_~U3R1ZHkgb2YgdGhlIERvdWJseSBDYWJpYmJvIFN1cHByZXNzZWQgRGVjYXkgPG1hdGg-RCsg4oaSIM-GIEsrPC9tYXRoPiBhbmQgdGhlIFNpbmdseSBDYWJpYmJvIFN1cHByZXNzZWQgRGVjYXkgPG1hdGg-RCtzIOKGkiDPhiBLKzwvbWF0aD4%2Ctipo_Physics%2BNote%2Ccor_~I2E4MmMwMA%2Cautores_~Si4gZG9zIEFuam9zOyBldCBhbGlp%2Cdetalhe_1991%2Csecao_Publications%2Cp_Ii9lbi9wdWJsaWNhY29lcy82YWQyYTc2NzYzOWY2MmIxMWFkYmI2YTIi%2Cs_7heugIvp6bSQdMYC.png" --- > Index of every page on this site: [llms.txt](https://index.cbpf.br/llms.txt) **Physics Note****Published** # **Study of the Doubly Cabibbo Suppressed Decay **D+→ϕK+\D^{+} \\rightarrow \\phi K^+\D+→ϕK+** and the Singly Cabibbo Suppressed Decay **Ds+→ϕK+\D^{+}\_{s} \\rightarrow \\phi K^+\Ds+​→ϕK+ **J. dos Anjos; et alii** 1991 [**Download PDF **0.3 MB](https://index.cbpf.br/files/publicacao/6ad2a767639f62b11adbb6a2/pdf) [**Contact owner**](mailto:apub@cbpf.br?subject=Study%20of%20the%20Doubly%20Cabibbo%20Suppressed%20Decay%20%3Cmath%3ED%2B%20%E2%86%92%20%CF%86%20K%2B%3C%2Fmath%3E%20and%20the%20Singly%20Cabibbo%20Suppressed%20Decay%20%3Cmath%3ED%2Bs%20%E2%86%92%20%CF%86%20K%2B%3C%2Fmath%3E) ## **Publication details**
Authors
J. dos Anjos; et alii
Type
Physics Note
Status
Published
Publication date
1991
Description
We have searched for the doubly Cabibbo suppressed decay <math>(DCSD)\,\!</math> <math>D^{\pm} \rightarrow \phi K^{\pm}\,\!</math> and the singly Cabibbo suppressed decay <math> (SCSD)\,\!</math> <math>D^{\pm}_{s} \rightarrow \phi K^\pm\,\!</math> in data from the Fermilab photoproduction experiment <math>E691\,\!</math>. The <math>D^\pm\,\!</math> decay mode is of particular interest because it cannot result from simple spectator decay. We observe a <math>D^\pm\,\!</math> signal with a statistical significance of <math>3.3\,\!</math> standard deviations, corresponding to a branching ratio of <math>B(D^{\pm} \rightarrow \phi K^\pm)\,\!</math> <math> = (4.0^{+2.2}_{-1.8} \pm 0.6) \times10^{-4}.</math> In the <math>D^{\pm}_s\,\!</math> mode we measure an upper limit <math>B(D^{\pm}_s \rightarrow \phi K^{\pm}) < 0.17%\,\!</math>.
Year
1991
Number
CBPF-NF-047/91
Linked to a thesis
No
Linked to a grant
No
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