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The scalar heavy quark content of the nucleon, ${\cal M}_q = \bra{N} m_q \barq q \ket{N},$ is relevant for computing the interaction of dark mattercandidates with ordinary matter, while ${\cal M}_s$ is important for predictingthe properties of dense matter. We compute ${\cal M}_q$ in perturbative QCD to${\cal{O}}{(\alpha^3)}.$ As one goes from ${\cal M}_t$ to ${\cal M}_c$ theleading order contribution decreases as the number of light quarks is dropping,while the radiative corrections grow and are all positive. The leading sourceof uncertainty in the calculation is due to the poorly known value of ${\calM}_s.$ A related calculation suggests that a large value for ${\cal M}_s$ maybe reasonable.Comment: 8 pages, 3 figures; a typo in the results correcte

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Heavy quark<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mover accent="true"><mml:mi>q</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mi>q</mml:mi></mml:math>matrix elements in the nucleon from perturbative QCD

Heavy quarkq¯qmatrix elements in the nucleon from perturbative QCD