def getLambdaT(m1, m2, Lambda1, Lambda2):
    """
    This function converts the Lambda1, Lambda2, mass1, mass2
    to Lambda tilde.
    """
    LambdaTilde = 2 ** 5 / (26 * (m1 + m2) ** 5)
    LambdaTilde *= (m1 ** 5 + 12 * m2 * m1 ** 4) * Lambda1 + (m2 ** 5 + 12 *
        m1 * m2 ** 4) * Lambda2
    return LambdaTilde
