sansmathaccent – Correct placement of accents in sans-serif maths

Sans serif maths (pro­duced by the beamer class or the sf­math pack­age) of­ten has ac­cents po­si­tioned in­cor­rectly.
The pack­age fixes the po­si­tion­ing of such ac­cents when the de­fault font (cmssi) is used for sans serif maths.