Measurement of the Hadronic Form Factor in D0 to K- E+ Nu_e Decays PDF Download
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Languages : en
Pages : 21
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The shape of the hadronic form factor f+ (q2) in the decay D° → K− e?{sub e} has been measured in a model independent analysis and compared with theoretical calculations. They 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 D° → K−?+, has also been measured to be R{sub D} = BR(D° → K−e+?{sub e})/BR(D° → K−?+) = 0.927 ± 0.007 ± 0.012. From these results, and using the present world average value for BR(D° → K−?+), 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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Category :
Languages : en
Pages : 21
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The shape of the hadronic form factor f+ (q2) in the decay D° → K− e?{sub e} has been measured in a model independent analysis and compared with theoretical calculations. They 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 D° → K−?+, has also been measured to be R{sub D} = BR(D° → K−e+?{sub e})/BR(D° → K−?+) = 0.927 ± 0.007 ± 0.012. From these results, and using the present world average value for BR(D° → K−?+), 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.
Author: B. Aubert
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Category :
Languages : en
Pages : 23
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A preliminary measurement of the q{sup 2} dependence of the D{sup 0} {yields} K{sup -}e{sup +}{nu}{sub e} decay rate is presented. This rate is proportional to the hadronic form factor squared, specified by a single parameter. This is either the mass in the simple pole ansatz m{sub pole} = (1.854 {+-} 0.016 {+-} 0.020) GeV/c{sup 2} or the scale in the modified pole ansatz {alpha}{sub pole} = 0.43 {+-} 0.03 {+-} 0.04. The first error refers to the statistical, the second to the systematic uncertainty.
Author: J. Serrano
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Category :
Languages : en
Pages : 21
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Based on the measured four-dimensional rate for D{sub s}{sup +} {yields} {phi}e{sup +}{nu}{sub e} decays, they have determined the ratios of the three hadronic form factors, {tau}{sub V} = V(0)/A{sub 1}(0) = 1.636 {+-} 0.067 {+-} 0.038 and {tau}{sub 2} = A{sub 2}(0)/A{sub 1}(0) = 0.705 {+-} 0.056 {+-} 0.029, using a simple pole ansatz for the q{sup 2} dependence, with fixed values of the pole masses for both the vector and axial form factors. By a separate fit to the same data, they have also extracted the pole mass for the axial form factors, m{sub A}: {tau}{sub V} = V(0)/A{sub 1}(0) = 1.633 {+-} 0.081 {+-} 0.068, {tau}{sub 2} = A{sub 2}(0)/A{sub 1}(0) = 0.711 {+-} 0.111 {+-} 0.096 and m{sub A} = (2.53{sub -0.35}{sup +0.54} {+-} 0.54)GeV/c{sup 2}.
Author: J. Stephen Miller
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ISBN:
Category :
Languages : en
Pages : 342
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![Measurement of Hadronic Form Factors in Semileptonic B Meson Decay [microform] PDF](https://books.google.com/books/content/images/frontcover/SYernQEACAAJ?fife=w80-h100)
Author: Miller, J. Stephen
Publisher: Ann Arbor, Mich. : University Microfilms International
ISBN:
Category :
Languages : en
Pages : 342
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Category :
Languages : en
Pages :
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We measure the dependence of {bar B}° → D*e−{bar {nu}}{sub e} on the decay angles and momentum transfer. The data sample consists of ≈ 86 x 106 B{bar B}-pairs accumulated on the?(4S) resonance by the BABAR detector at the asymmetric e+e− collider PEP-II. We specify the three form factors by two ratios R1 and R2, and by a single parameter?2 characterizing the polynomial representing h{sub A1}, the function which describes the momentum-transfer dependence of the form factor A1. We determine R1, R2, and?2 using an unbinned maximum likelihood fit to the full decay distribution. The results are R{sub 1} = 1.396 ± 0.060 ± 0.035 ± 0.027, R2 = 0.885 ± 0.040 ± 0.022 ± 0.013, and?2 = 1.145 ± 0.059 ± 0.030 ± 0.035. The stated uncertainties are the statistical from the data, statistical from the size of the Monte Carlo sample and the systematic uncertainty, respectively. In addition, based on this measurement, we give an updated value for the CKM matrix element.
Author:
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Category : Nuclear energy
Languages : en
Pages : 722
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![Measurement of B -] D Form Factors in the Semileptonic Decay B -] D* L Nu at BaBar PDF](https://books.google.com/books/content/images/frontcover/kSm8wQEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages : 343
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We present here the results of a measurement of the three semileptonic form factors involved in the decay B° → D*l?, where l is one of the two light charged leptons (i.e. an electron or muon--though the final results in this work are determined only for l = electron). This measurement uses the Babar 2000-2002 data set, which is altogether approximately 85 x 106 B{bar B}-pairs in 78 fb−1 of integrated luminosity. The D* was reconstructed in the channel D*+ → D°?+, and the D° in the channel D° → K−?+. This analysis was based ultimately on ≈ 16,386 reconstructed events with an estimated background contamination of ≈ 15%. The method of the measurement was to perform a unbinned maximum likelihood fit in the four kinematic variables that describe the decay for the three form factor parameters R1, R2, and?2. The results obtained for the form factor ratios are R1 = 1.328 ± 0.055 ± 0.025 ± 0.025 and R2 = 0.920 ± 0.044 ± 0.020 ± 0.013 for the ratios and?2 = 0.769 ± 0.039 ± 0.019 ± 0.032 for the form factor slope. The errors given are statistical, Monte Carlo statistical and systematic respectively.
![Measurement of B -] D* Form Factors in the Semileptonic Decay B -] D* L Nu PDF](https://books.google.com/books/content/images/frontcover/nerADAEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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The authors present a preliminary measurement of R[sub 1], and R[sub 2], and [rho][sup 2], which are the three parameters used to characterize the B [yields] D*[ell][bar [nu]][sub e] form factors (A[sub 1], V, and A[sub 2]). They use 85 x 10[sup 6] B[bar B]-pairs accumulated on the [Upsilon](4S) resonance at PEP-II. In this analysis they use the decay mode [bar B][sup 0] [yields] D[sup +]*e[sup -][bar [nu]] and its charge conjugate. The D*[sup +] is reconstructed in the channel D*[sup +] [yields] D[sup 0][pi][sup +] and the D[sup 0] in the channel D[sup 0] [yields] K[sup -][pi][sup +]. They parameterize the form factors in terms of their ratios (determined by the parameters R[sub 1] and R[sub 2]) and the common slope [rho][sup 2] in the variable w (a quantity related to the momentum transfer in the decay process). These parameters are determined via an unbinned maximum likelihood fit to the distributions in four kinematic variables (three decay angles and w). The results are R[sub 1] = 1.328 [+-] 0.055 [+-] 0.025 [+-] 0.025 and R[sub 2] = 0.920 [+-] 0.044 [+-] 0.020 [+-] 0.013 for the ratios and [rho][sup 2] = 0.769 [+-] 0.l039 [+-] 0.019 [+-] 0.032 for the slope. The stated errors are the statistical uncertainty from the data, statistical uncertainty from the size of the Monte Carlo sample and the systematic uncertainty, respectively.
Author: Et al
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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