World Average Value for the D_s⁺ Decay Constant f_Ds

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

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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
2009	CLEO-c	P. U. E. Onyisi et al. (CLEO Collab.), Phys. Rev. D 79, 052002 (2009).	τ+ ν (τ → 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 (τ → 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:

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 τ_Ds). The COMBOS output is here .