By Yuri Dokshitzer
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Additional info for Basics of perturbative QCD
Q q' . q 'H I , A / q q' q q Fig. 7. The effective AL = 1 quark operator. the physical π° and η masses, ->20rr 0 2 2 -im2n . 34) and hence diagonalized away. Thus the e 3 w 3 contribution to η -> π° + Η vanishes, and a similar argument applies to Σ° -> Λ + Η. 2) of the Higgs boson. 30) is represented diagrammatically in fig. 7. By virtue of eqs. 13) this operator may be written in the form £ e f f( A / = 1) = ^q±r3qH(mu - md + am\mq), q =Q . ( 3 3 )5 The term proportional to m u - m d is just the w3 term discussed above.
The calculated Higgs lifetime is plotted in fig. 2 27 J. Ellis et al. / Higgs boson 296 m H < 2M , so that the Higgs boson could leave a discernible track. For m H > 2MΜ - 2 0 the lifetime decreases rapidly to 0 ( 1 0 ) sec for raH ^ 1 0 GeV. The organization of the paper is as follows. Sect. 2 discusses the role of the Higgs boson in gauge theories of weak and electromagnetic interactions, reviews present experimental limits on its mass, and discusses the cosmological connection. Sect. 3 contains calculations of Higgs boson yields in various production and decay processes, while sect.
17 where m H is expressed in units of GeV, and we have allowed for the effects of a finite Z° decay width Γ, expected to be 0(1) GeV. 74) has been 2 evaluated at the optimum cm. energy, which is \/s = mz0 + \fl s/m^ + ^ Γ . In the Weinberg-Salam model with the experimentally favoured value of 0 w , w z O — 75 GeV. 1 resonance ). We find Λ . 048)4 Π Χ ^ Ι ) . ( 3. 1 -> e e~) — 5 keV, eq. ÏL . 1 + V 2 m H . + There are two other ways one might imagine looking for the Higgs boson in e e~ + collisions.