Author: A. J. Bevan
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Measurement of the Branching Ratio and Form Factor Parameters of the Decay KL → M+m-g
A Measurement of the Branching Ratio and Form Factor of K [subscript L Arrow Mu + Mu - Gamma]
Author: Gene Breese Quinn
Publisher:
ISBN:
Category : Branching ratios (Nuclear physics)
Languages : en
Pages : 320
Book Description
Publisher:
ISBN:
Category : Branching ratios (Nuclear physics)
Languages : en
Pages : 320
Book Description
Measurement of Branching Fractions and Form Factor Parameters of B-]Dlnu and B-]D*lnu Decays at BaBar
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We use a global fit to determine the form factor slopes and branching fractions of the decays B --> Dlnu and B --> D*lnu. We reconstruct Dl pairs and construct a 3-dimensional distribution binned in lepton momentum, D momentum and cosTheta(B-Dl). These kinematic variables provide good separation between the signal and background. We fit electron and muon samples separately and combine them after calculating systematic uncertainties. The form factor slopes, rhoD^2 for B --> Dlnu and rho^2 for B --> D*lnu decays, are measured to be rhoD^2 = 1.22 +- 0.04 +- 0.07 and rho^2 = 1.21 +- 0.02 +- 0.07, where the errors are statistical and systematic, respectively. Branching fractions are fitted to be B(B+ --> D0lnu) = (2.36 +- 0.03 +- 0.12) % and B(B^+ --> D*0lnu) = (5.37 +- 0.02 +- 0.21) %. We use these results to determine the products, G(1)|Vcb| = (43.8 +- 0.8 +- 2.3)*10^{-3} and F(1)|Vcb| = (35.7 +- 0.2 +- 1.2)*10^{-3} of the form factors at zero recoil and the CKM matrix element |Vcb|, from which |Vcb| can be extracted using theoretical input.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
We use a global fit to determine the form factor slopes and branching fractions of the decays B --> Dlnu and B --> D*lnu. We reconstruct Dl pairs and construct a 3-dimensional distribution binned in lepton momentum, D momentum and cosTheta(B-Dl). These kinematic variables provide good separation between the signal and background. We fit electron and muon samples separately and combine them after calculating systematic uncertainties. The form factor slopes, rhoD^2 for B --> Dlnu and rho^2 for B --> D*lnu decays, are measured to be rhoD^2 = 1.22 +- 0.04 +- 0.07 and rho^2 = 1.21 +- 0.02 +- 0.07, where the errors are statistical and systematic, respectively. Branching fractions are fitted to be B(B+ --> D0lnu) = (2.36 +- 0.03 +- 0.12) % and B(B^+ --> D*0lnu) = (5.37 +- 0.02 +- 0.21) %. We use these results to determine the products, G(1)|Vcb| = (43.8 +- 0.8 +- 2.3)*10^{-3} and F(1)|Vcb| = (35.7 +- 0.2 +- 1.2)*10^{-3} of the form factors at zero recoil and the CKM matrix element |Vcb|, from which |Vcb| can be extracted using theoretical input.
Measurement of Branching Fractions and Form Factor Parameters of B-]Dlnu and B-]D*lnu Decays at BaBar
Time Reversal, the Form Factor Ratio and the Branching Ratio in K+ Mu3 Decay
Measurements of the Branching Fractions and Form Factor of Semileptonic Decays of B Mesons to D Mesons
Dalitz Plot Analysis of the Form Factors Ratio in K+u3 Decay
Author: David Limon Murphree
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 184
Book Description
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 184
Book Description
Observation and Branching Fraction Measurement of the [neutral Cascade Beta Decay] at KTeV/E799-II, Fermilab
Measurement of B -] D* Form Factors in the Semileptonic Decay B -] D* L Nu
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Measurements of the $B \to D*̂$ Form Factors Using the Decay $\bar{B}0̂ \to D{̂*+} E-̂ \bar{\nu}_e$
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
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.