Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions
We compute the contribution from the twist-3 fragmentation function for light hadron production in collisions between transversely and longitudinally polarized protons, i.e., p↑p→→hX, which can cause a double-spin asymmetry (DSA) ALT. This is a naïve T-even twist-3 observable that we analyze in coll...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2016-01-01
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| Series: | Physics Letters B |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315008618 |
| _version_ | 1818206200187060224 |
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| author | Y. Koike D. Pitonyak Y. Takagi S. Yoshida |
| author_facet | Y. Koike D. Pitonyak Y. Takagi S. Yoshida |
| author_sort | Y. Koike |
| collection | DOAJ |
| description | We compute the contribution from the twist-3 fragmentation function for light hadron production in collisions between transversely and longitudinally polarized protons, i.e., p↑p→→hX, which can cause a double-spin asymmetry (DSA) ALT. This is a naïve T-even twist-3 observable that we analyze in collinear factorization using both Feynman gauge and lightcone gauge as well as give a general proof of color gauge invariance. So far only twist-3 effects in the transversely polarized proton have been studied for ALT in p↑p→→hX. However, there are indications that the naïve T-odd transverse single-spin asymmetry (SSA) AN in p↑p→hX is dominated not by such distribution effects but rather by a fragmentation mechanism. Therefore, one may expect similarly that the fragmentation contribution is important for ALT. Given possible plans at RHIC to measure this observable, it is timely to provide a calculation of this term. |
| first_indexed | 2024-12-12T04:09:15Z |
| format | Article |
| id | doaj.art-4d49b70288924537b107ba033b79b73f |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-12T04:09:15Z |
| publishDate | 2016-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-4d49b70288924537b107ba033b79b73f2022-12-22T00:38:40ZengElsevierPhysics Letters B0370-26931873-24452016-01-01752C9510110.1016/j.physletb.2015.11.014Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisionsY. Koike0D. Pitonyak1Y. Takagi2S. Yoshida3Department of Physics, Niigata University, Ikarashi, Niigata 950-2181, JapanRIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USAGraduate School of Science and Technology, Niigata University, Ikarashi, Niigata 950-2181, JapanDepartment of Physics, Niigata University, Ikarashi, Niigata 950-2181, JapanWe compute the contribution from the twist-3 fragmentation function for light hadron production in collisions between transversely and longitudinally polarized protons, i.e., p↑p→→hX, which can cause a double-spin asymmetry (DSA) ALT. This is a naïve T-even twist-3 observable that we analyze in collinear factorization using both Feynman gauge and lightcone gauge as well as give a general proof of color gauge invariance. So far only twist-3 effects in the transversely polarized proton have been studied for ALT in p↑p→→hX. However, there are indications that the naïve T-odd transverse single-spin asymmetry (SSA) AN in p↑p→hX is dominated not by such distribution effects but rather by a fragmentation mechanism. Therefore, one may expect similarly that the fragmentation contribution is important for ALT. Given possible plans at RHIC to measure this observable, it is timely to provide a calculation of this term.http://www.sciencedirect.com/science/article/pii/S0370269315008618Twist-3 effectsSpin asymmetriesFragmentation |
| spellingShingle | Y. Koike D. Pitonyak Y. Takagi S. Yoshida Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions Physics Letters B Twist-3 effects Spin asymmetries Fragmentation |
| title | Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions |
| title_full | Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions |
| title_fullStr | Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions |
| title_full_unstemmed | Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions |
| title_short | Twist-3 fragmentation effects for ALT in light hadron production from proton–proton collisions |
| title_sort | twist 3 fragmentation effects for alt in light hadron production from proton proton collisions |
| topic | Twist-3 effects Spin asymmetries Fragmentation |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315008618 |
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