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Weak effects in proton beam asymmetries at polarised RHIC and beyond | | S. Moretti
; M.R. Nolten
; D.A. Ross
; | | Date: |
23 Sep 2005 | | Subject: | hep-ph | | Affiliation: | Southampton University | | Abstract: | We report on a calculation of the full one-loop weak corrections through the order $alpha_{mathrm{S}}^2alpha_{mathrm{W}}$ to massless parton-parton scattering in all possible channels at the Relativistic Heavy Ion Collider (RHIC) running with polarised $pp$ beams (RHIC-Spin). This study extends the analysis previously carried out for the case of $2 o2$ subprocesses with two external gluons, by including all possible four-quark modes with and without an external gluon. The additional contributions due to the new four-quarks processes are extremely large, of order 50 to 100% (of either sign), not only in the case of parity-violating beam asymmetries but also for the parity-conserving ones and (although to a more limited extent) the total cross section. Such ${cal O}(alpha_{mathrm{S}}^2alpha_{mathrm{W}})$ effects on the parity-violating observables would be an astounding 5 times larger for the case of the LHC with polarised beams -- which has been discussed as one of the possible upgrades of the CERN machine -- whereas they would be much reduced for the case of the parity-conserving ones as well as the cross section | | Source: | arXiv, hep-ph/0509254 | | Services: | Forum | Review | PDF | Favorites | |
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