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تسجيل مستخدم جديدقياس العامل الشكلي الهادروني في التحولات D0 --> K- e+ nue
Measurement of the Hadronic Form Factor in D0 --> K- e+ nue Decays
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تم قياس شكل العامل الهادروني f+(q2) في التحلل D0 --> K- e+ nue في تحليل غير علمي النموذج ومقارنته بالحسابات النظرية. نستخدم 75 fb(-1) من البيانات التي تم تسجيلها من قبل مستشعر بابار في مضخة الإلكترون-البوزيترون PEPII. تم قياس نسبة التفرع الشبهي لهذا التحلل، المقارنة مع التحلل D0 --> K- pi+، وهي RD = BR(D0 --> K- e+ nue)/BR(D0 --> K- pi+) = 0.927 +/- 0.007 +/- 0.012. من هذه النتائج، واستخدام قيمة المتوسط العالمي الحالي ل BR(D0 --> K- pi+)، يتم تحديد التسوية للعامل الشكلي في q2=0 على النحو التالي: f+(0)=0.727 +/- 0.007 +/- 0.005 +/- 0.007 حيث تتضمن الاحتمالات الإحصائية والنظرية والخارجية على التوالي.
The shape of the hadronic form factor f+(q2) in the decay D0 --> K- e+ nue has been measured in a model independent analysis and compared with theoretical calculations. We use 75 fb(-1) of data recorded by the BABAR detector at the PEPII electron-positron collider. The corresponding decay branching fraction, relative to the decay D0 --> K- pi+, has also been measured to be RD = BR(D0 --> K- e+ nue)/BR(D0 --> K- pi+) = 0.927 +/- 0.007 +/- 0.012. From these results, and using the present world average value for BR(D0 --> K- pi+), the normalization of the form factor at q2=0 is determined to be f+(0)=0.727 +/- 0.007 +/- 0.005 +/- 0.007 where the uncertainties are statistical, systematic, and from external inputs, respectively.
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