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I was hitting against a wall for the last hours.
I am not able to obtain the 1/2 terms in the eq. 5 of this paper and left all in terms of only ##N_i## and ##\overline{N_i}##,neither. Anyone could give me a tip?
http://arxiv.org/pdf/hep-ph/0210271v2.pdf
Thank you in advance.
I am not able to obtain the 1/2 terms in the eq. 5 of this paper and left all in terms of only ##N_i## and ##\overline{N_i}##,neither. Anyone could give me a tip?
http://arxiv.org/pdf/hep-ph/0210271v2.pdf
Thank you in advance.
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