Analysis of the Λb → Λℓ+ℓ− transition in the SM4 using form factors from full QCD K. Azizi and N. Katırcı Eur. Phys. J. A, 48 5 (2012) 73 Published online: 25 May 2012 DOI: 10.1140/epja/i2012-12073-x