 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2022/iii/paper-307/4/v/solution

The magnetic gauge group is

Sp (N_{c})

with

N_{c} = N_{f} - N_{c} - 2

. Repeating the gauge-anomaly cancellation gives

R [q] = 1 - \frac{N _{c} + 1}{N _{f}} = \frac{N _{c} + 1}{N _{f}} .

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