Precise measurement of Γ(KS→π+π-(γ))/Γ(KS→π0π0) with the KLOE detector at DAΦNE |
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| Institution: | (1) Institute of High Energy Physics, Academica Sinica, Beijing, China;(2) Laboratori Nazionali di Frascati dell’INFN, Frascati, Italy;(3) Institut für Experimentelle Kernphysik, Universit?t Karlsruhe, Karlsruhe, Germany;(4) Dipartimento di Fisica, Università e Sezione INFN, Lecce, Italy;(5) Institute for Theoretical and Experimental Physics, Moscow, Russia;(6) Dipartimento di Scienze Fisiche, Università “Federico II” e Sezione INFN, Napoli, Italy;(7) Dipartimento di Fisica, Università e Sezione INFN, Pisa, Italy;(8) Dipartimento di Energetica, Università “La Sapienza”, Roma, Italy;(9) Dipartimento di Fisica, Università “La Sapienza” e Sezione INFN, Roma, Italy;(10) Dipartimento di Fisica, Università “Tor Vergata” e Sezione INFN, Roma, Italy;(11) Dipartimento di Fisica, Università “Roma Tre” e Sezione INFN, Roma, Italy;(12) Physics Department, State University of New York, Stony Brook, USA;(13) Physics Department, University of Virginia, Charlottesville, USA |
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| Abstract: | Using a sample of over 400 million φ→KSKL decays produced during the years 2001 and 2002 at the DAΦNE e+e- collider, the ratio RS
π=Γ(KS→π+π-(γ))/Γ(KS→π0π0) has been measured with the KLOE detector. The result is RS
π=2.2555±0.0012stat±0.0021corr-stat±0.0050syst, which is in good agreement with the previously published result based on the KLOE data sample from the year 2000. The average
of the KLOE results is RS
π=2.2549±0.0054, reducing the total error by a factor of three, to 0.25%. |
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