Twist2CounterOperator
Twist2CounterOperator[p, mu, nu, a, b, 5]
is a special routine for particular QCD calculations.
Also available: Twist2CounterOperator[p, 7]
, Twist2CounterOperator[p1,p2,{p3,mu,a}, 1]
(p1
: incoming quark momentum, p3
: incoming gluon (count1)).
See also
Overview, Twist2GluonOperator.
Examples
Twist2CounterOperator[p, mu, nu, a, b, 5]
−2ε1((−1)m+1)CAgs2Snδab((m8−m+112+m+28−m−18)gmunu(Δ⋅p)m+(m8−m+124+m+224−m−14)p2ΔmuΔnu(Δ⋅p)m−2+(−m6+m+116−m+216+m−16)(Δ⋅p)m−1(pmuΔnu+Δmupnu))
Twist2CounterOperator[p, 7]
ε((−1)m+1)(m2−m+11−m−12)CFgs2Snγ⋅Δ(Δ⋅p)m−1
Twist2CounterOperator[p1, p2, {p3, mu, a}, 1]
−2ε((−1)m+1)(m2−m+11−m−12)Tags3ΔmuSn(CA−2CF)γ⋅Δ(Δ⋅p1+Δ⋅p2(Δ⋅p1)m−1−Δ⋅p1+Δ⋅p2(−(Δ⋅p2))m−1)