World Average Value for the Ds+ Decay Constant fDs

People working on this:   David Asner, David Cassel, Jonathan Coleman, Brian Meadows, Alan Schwartz

 

Input results for B(Ds+ → μ+ ν) and B(Ds+ → τ+ ν):

> >
Year Experiment Source Mode Branching Fraction
2009 CLEO-c J. P. Alexander et al. (CLEO Collab.), Phys. Rev. D 79, 052001 (2009). μ+ ν (5.65 ± 0.45 ± 0.17) × 10-3
2008 Belle L. Widhalm et al. (Belle Collab.), Phys. Rev.Lett. 100, 241801 (2008). μ+ ν (6.44 ± 0.76 ± 0.52) × 10-3
2007 CLEO-c M. Artuso et al., (CLEO Collab.), Phys. Rev.Lett. 99, 071802 (2007). μ+ ν (5.94 ± 0.66 ± 0.31) × 10-3
2007 Babar B. Aubert et al., (BABAR Collab.), Phys. Lett. 98, 141801 (2007) μ+ ν / φ π+ (6.74 ±0.83 ± 0.26 ±0.66 ) × 10-3
2002 ALEPH A. Heister et al., (ALEPHCollab.), Phys. Lett. B528, 1 (2002). μ+ ν / φ π+ (6.8 ± 1.1 ± 1.8) × 10-3
2000 BEATRICE Y.Alexandrov et al., (BEATRICE Collab.), Phys. Lett. B478, 31 (2000).  μ+ ν / φ π+ (8.3 ± 2.3 ± 0.6 ± 2.1 ) × 10-3
1998 CLEO M. Chadha et al., (CLEO Collab), Phys. Rev. D58, 032002(1998).  μ+ ν / φ π+ (6.2 ± 0.8 ± 1.3 ± 1.6) × 10-3
2010 BaBar J. P. Lees et al. (BaBar Collab.), arXiv:1003.3063. τ+ ν / K0S K+
+ → e+ ν ν)
(4.5 ± 0.5 ± 0.4± 0.3) %
2009 CLEO-c P. Naik et al. (CLEO Collab.), Phys. Rev. D 80, 112004 (2009). τ+ ν
+ → ρ+ ν)
(5.52 ± 0.57 ± 0.21) %
2009 CLEO-c P. U. E. Onyisi et al. (CLEO Collab.), Phys. Rev. D 79, 052002 (2009). τ+ ν
+ → e+ ν ν)
(5.30 ± 0.47 ± 0.22) %
2009 CLEO-c J. P. Alexander et al. (CLEO Collab.), Phys. Rev. D 79, 052001 (2009). τ+ ν
+ → π+ ν)
(6.42 ± 0.81 ± 0.18) %
2008 CLEO-c K.M. Ecklund et al. (CLEO Collab.), Phys. Rev. Lett. 100, 161801 (2008). τ+ ν (6.17 ± 0.71 ± 0.36) %
2007 CLEO-c M. Artuso et al., (CLEO Collab.), Phys. Rev. Lett. 99, 071802 (2007). τ+ ν (8.0 ± 1.3 ± 0.4) %
2002 ALEPH A. Heister et al., (ALEPHCollab.), Phys. Lett. B528, 1 (2002). τ+ ν (5.8 ± 0.8 ± 1.8) %
2001 OPAL G. Abbiendi et al., (OPAL Collan.), Phys. Lett. B516, 236 (2001). τ+ ν (7.0 ± 2.1 ± 2.0) %
1997 L3 M. Acciarri et al., (L3 Collab.), Phys. Lett. B396, 327 (1997) τ+ ν (7.4 ± 2.8 ± 1.6 ± 1.8) %

 

 

Procedure:



 

Results, plot C (click on figure for higher resolution):

Note that the first error listed is the total uncorrelated error (statistical plus systematic), and the second error listed is the correlated error (mainly from τDs). The COMBOS output is here .

 

The World Average is:     f Ds = (254.6 ± 5.9) MeV

 

      B(Ds+ → μ+ ν) average, plot A:                                           B(Ds+ → τ+ ν) average, plot B:
      (click on figure for higher resolution)                                                                     (click on figure for higher resolution)
      The COMBOS output is here.                                                                                 The COMBOS output is here.

                 

 

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Adjustment of Babar measurement for Ds+→f0π+ and B(φ → K+K):                                     fDs from Γ(Ds+ → μ+ ν)/ Γ(Ds+ → K+ Kπ+):
                                                                                                                                                                        (from Eq. (1) above)

                 

 

 

 


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