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Weak effects in proton beam asymmetries at polarised RHIC and beyond

Weak effects in proton beam asymmetries at polarised RHIC and beyond
Weak effects in proton beam asymmetries at polarised RHIC and beyond
We report on a calculation of the full one-loop weak corrections through the order to 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?2 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 effects on the CP-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 CP-conserving ones as well as the cross section.
electroweak physics, parity violation, polarised pp scattering, rhic
0370-2693
86-92
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Nolten, M.R.
4f2ad5b9-777d-4337-ab8c-0de1605b4ea2
Ross, D.A.
eb79bbfe-fb97-4bb3-813c-98f278e5a55f
Moretti, S.
b57cf0f0-4bc3-4e02-96e3-071255366614
Nolten, M.R.
4f2ad5b9-777d-4337-ab8c-0de1605b4ea2
Ross, D.A.
eb79bbfe-fb97-4bb3-813c-98f278e5a55f

Moretti, S., Nolten, M.R. and Ross, D.A. (2006) Weak effects in proton beam asymmetries at polarised RHIC and beyond. Physics Letters B, 643 (2), 86-92. (doi:10.1016/j.physletb.2006.06.084).

Record type: Article

Abstract

We report on a calculation of the full one-loop weak corrections through the order to 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?2 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 effects on the CP-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 CP-conserving ones as well as the cross section.

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More information

Published date: 7 December 2006
Keywords: electroweak physics, parity violation, polarised pp scattering, rhic

Identifiers

Local EPrints ID: 57484
URI: http://eprints.soton.ac.uk/id/eprint/57484
ISSN: 0370-2693
PURE UUID: 80dca6fd-7a5e-44d9-9a12-2b2bb7eb8c21

Catalogue record

Date deposited: 13 Aug 2008
Last modified: 09 Nov 2021 09:53

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Contributors

Author: S. Moretti
Author: M.R. Nolten
Author: D.A. Ross

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