def METHOD_NAME( object, matchCollection):
    '''Return the best match to object in matchCollection, which is the closest object in delta R'''
    deltaR2Min = float('+inf')
    bm = None
    for match in matchCollection:
        dR2 = deltaR2( object.eta(), object.phi(),
                       match.eta(), match.phi() )
        if dR2 < deltaR2Min:
            deltaR2Min = dR2
            bm = match
    return bm, deltaR2Min