# The $\hat{\Gamma}$-genus and a regularization of an $S^1$-equivariant Euler class

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Published Article
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DOI: 10.1088/1751-8113/41/42/425204
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arXiv
We show that a new multiplicative genus, in the sense of Hirzebruch, can be obtained by generalizing a calculation due to Atiyah and Witten. We introduce this as the $\hat{\Gamma}$-genus, compute its value for some examples and highlight some of its interesting properties. We also indicate a connection with the study of multiple zeta values, which gives an algebraic interpretation for our proposed regularization procedure.