Gravitational form factor of the kaon in holographic QCD

The gravitational form factor (GFF) of the kaon is investigated in a bottom-up holographic QCD model, in which the strange quark mass breaks the SU(3) flavor symmetry. The probe energy ( <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msup> <a:mi>Q</a:mi> <a:mn>2</a:mn> </a:msup> </a:math> ) dependence of the kaon GFF is explicitly shown and compared to that of the pion. It is presented that our result shows the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>1</c:mn> <c:mo>/</c:mo> <c:msup> <c:mi>Q</c:mi> <c:mn>2</c:mn> </c:msup> </c:math> behavior in the high energy region, which is consistent with the perturbative QCD prediction. The gravitational radius of the kaon is also calculated, and it is found that the result is quite close to that of the pion but slightly smaller.