Abstract / Description of output
The process gg→h0→γγ is studied in the Lee-Wick extension of the standard model (LWSM) proposed by Grinstein, O’Connell, and Wise. In this model, negative norm partners for each SM field are introduced with the aim to cancel quadratic divergences in the Higgs mass. All sectors of the model relevant to gg→h0→γγ are diagonalized and results are commented on from the perspective of both the Lee-Wick and higher-derivative formalisms. Deviations from the SM rate for gg→h0 are found to be of the order of 15%–5% for Lee-Wick masses in the range 500–1000 GeV. Effects on the rate for h0→γγ are smaller, of the order of 5%–1% for Lee-Wick masses in the same range. These comparatively small changes may well provide a means of distinguishing the LWSM from other models such as universal extra dimensions where same-spin partners to standard model fields also appear. Corrections to determinations of Cabibbo-Kobayashi-Maskawa (CKM) elements |Vt(b,s,d)| are also considered and are shown to be positive, allowing the possibility of measuring a CKM element larger than unity, a characteristic signature of the ghostlike nature of the Lee-Wick fields.