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000622862 1001_ $$0P:(DE-HGF)0$$aAhmed, Taushif$$b0
000622862 245__ $$aTwo-loop helicity amplitudes for diphoton production with massive quark loop
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000622862 520__ $$aWe compute two-loop helicity amplitudes in QCD for diphoton production through quark- and gluon-initiated channels, accounting for a massive internal quark loop by keeping its full mass dependence. Using physical projectors, we directly decompose the amplitude into its helicity components. By renormalising the heavy quark mass in on-shell, and other quantities in $\overline{\rm MS}$ schemes, we obtain finite remainders. This work paves the way for calculating the cross-section for diphoton production at higher orders in QCD with a massive quark loop, employing different subtraction schemes. The effect of a heavy quark is expected to play a crucial role in high-luminosity LHC.
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000622862 7001_ $$0P:(DE-HGF)0$$aChakraborty, Amlan$$b1
000622862 7001_ $$0P:(DE-HGF)0$$aChaubey, Ekta$$b2
000622862 7001_ $$0P:(DE-H253)PIP1111772$$aKaur, Mandeep$$b3$$eCorresponding author$$udesy
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