Improved measurement of the longitudinal spin transfer to [Lambda] and [Lambda bar] hyperons in polarized proton-proton collisions at √s=200 GeV
The longitudinal spin transfer DLL to Λ and ¯Λ hyperons produced in high-energy polarized proton-proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and antiquarks of the proton, and to longitudinally polarized fragmentation functions. We report an...
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| Main Authors: | , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
20 December 2018
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| In: |
Physical review
Year: 2018, Volume: 98, Issue: 11 |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.98.112009 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1103/PhysRevD.98.112009 Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.98.112009 
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| Author Notes: | J. Adam, I.M. Deppner, N. Herrmann [und 353 weitere] (STAR Collaboration) |
| Summary: | The longitudinal spin transfer DLL to Λ and ¯Λ hyperons produced in high-energy polarized proton-proton collisions is expected to be sensitive to the helicity distribution functions of strange quarks and antiquarks of the proton, and to longitudinally polarized fragmentation functions. We report an improved measurement of DLL from data obtained at a center-of-mass energy of √s=200 GeV with the STAR detector at RHIC. The data have an approximately twelve times larger figure of merit than prior results and cover |η|<1.2 in pseudorapidity with transverse momenta pT up to 6 GeV/c. In the forward scattering hemisphere at largest pT, the longitudinal spin transfer is found to be DLL=−0.036±0.048(stat)±0.013(sys) for Λ hyperons and DLL=0.032±0.043(stat)±0.013(sys) for ¯Λ antihyperons. The dependences on η and pT are presented and compared with model evaluations. |
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| Item Description: | Gesehen am 05.07.2019 Im Titel wird Lambda als griechischer Buchstabe dargestellt |
| Physical Description: | Online Resource |
| ISSN: | 2470-0029 |
| DOI: | 10.1103/PhysRevD.98.112009 |