Electromagnetic contribution to charge symmetry violation in parton distributions
We report a calculation of the combined effect of photon radiation and quark mass differences on charge symmetry violation (CSV) in the parton distribution functions of the nucleon. Following a recent suggestion of Martin and Ryskin, the initial photon distribution is calculated in terms of coherent...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-02-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315010102 |
| _version_ | 1818766121391620096 |
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| author | X.G. Wang A.W. Thomas R.D. Young |
| author_facet | X.G. Wang A.W. Thomas R.D. Young |
| author_sort | X.G. Wang |
| collection | DOAJ |
| description | We report a calculation of the combined effect of photon radiation and quark mass differences on charge symmetry violation (CSV) in the parton distribution functions of the nucleon. Following a recent suggestion of Martin and Ryskin, the initial photon distribution is calculated in terms of coherent radiation from the proton as a whole, while the effect of the quark mass difference is based on a recent lattice QCD simulation. The distributions are then evolved to a scale at which they can be compared with experiment by including both QCD and QED radiation. Overall, at a scale of 5 GeV2, the total CSV effect on the phenomenologically important difference between the d and u-quark distributions is some 20% larger than the value based on quark mass differences alone. In total these sources of CSV account for approximately 40% of the NuTeV anomaly. |
| first_indexed | 2024-12-18T08:28:57Z |
| format | Article |
| id | doaj.art-11fb7958fd0546018b322061e2cdc68b |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-18T08:28:57Z |
| publishDate | 2016-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-11fb7958fd0546018b322061e2cdc68b2022-12-21T21:14:31ZengElsevierPhysics Letters B0370-26931873-24452016-02-01753C59559910.1016/j.physletb.2015.12.062Electromagnetic contribution to charge symmetry violation in parton distributionsX.G. WangA.W. ThomasR.D. YoungWe report a calculation of the combined effect of photon radiation and quark mass differences on charge symmetry violation (CSV) in the parton distribution functions of the nucleon. Following a recent suggestion of Martin and Ryskin, the initial photon distribution is calculated in terms of coherent radiation from the proton as a whole, while the effect of the quark mass difference is based on a recent lattice QCD simulation. The distributions are then evolved to a scale at which they can be compared with experiment by including both QCD and QED radiation. Overall, at a scale of 5 GeV2, the total CSV effect on the phenomenologically important difference between the d and u-quark distributions is some 20% larger than the value based on quark mass differences alone. In total these sources of CSV account for approximately 40% of the NuTeV anomaly.http://www.sciencedirect.com/science/article/pii/S0370269315010102Charge symmetryParton distributionsElectromagnetic correction |
| spellingShingle | X.G. Wang A.W. Thomas R.D. Young Electromagnetic contribution to charge symmetry violation in parton distributions Physics Letters B Charge symmetry Parton distributions Electromagnetic correction |
| title | Electromagnetic contribution to charge symmetry violation in parton distributions |
| title_full | Electromagnetic contribution to charge symmetry violation in parton distributions |
| title_fullStr | Electromagnetic contribution to charge symmetry violation in parton distributions |
| title_full_unstemmed | Electromagnetic contribution to charge symmetry violation in parton distributions |
| title_short | Electromagnetic contribution to charge symmetry violation in parton distributions |
| title_sort | electromagnetic contribution to charge symmetry violation in parton distributions |
| topic | Charge symmetry Parton distributions Electromagnetic correction |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315010102 |
| work_keys_str_mv | AT xgwang electromagneticcontributiontochargesymmetryviolationinpartondistributions AT awthomas electromagneticcontributiontochargesymmetryviolationinpartondistributions AT rdyoung electromagneticcontributiontochargesymmetryviolationinpartondistributions |