More about on the short distance contribution to the "B_c -> B_u^* gamma" decay

TL;DR

This paper calculates the short distance contribution to the B_c to B_u^* gamma decay using QCD sum rules, revealing a significantly larger transition form factor than previous models.

Contribution

It provides a QCD sum rules calculation of the decay's transition form factor, highlighting the importance of short distance effects.

Findings

QCD sum rules predict a transition form factor twice as large as previous models.

Short distance contributions are significant in the decay process.

The result emphasizes the need to consider short distance effects in such decays.

Abstract

We calculate the transition form factor for the 'B_c -> B_u^* gamma' decay taking into account only the short distance contribution, in framework of QCD sum rules method. We observe that the transition form factor predicted by the QCD sum rules method is approximately two times larger compared to the result predicted by the Isgur, Scora, Grinstein and Wise model.