Naslov
Longitudinal Spin Transfer to Lambda and anti-Lambda Hyperons in Polarized Proton-Proton Collisions at s**(1/2) = 200-GeV

Autori
Abelev. B.I. ; ... Planinić, Mirko ; Poljak, Nikola ; ...

Izvornik
Physical Review D - Particles, Fields, Gravitation, and Cosmology (1550-7998) 80 (2009), 11; 111102-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
longitudinal; spin; polarized

Sažetak
The longitudinal spin transfer, $D_{; ; ; LL}; ; ; $, from high energy polarized protons to $\Lambda$ and $\bar{; ; ; \Lambda}; ; ; $ hyperons has been measured for the first time in proton-proton collisions at $\sqrt{; ; ; s}; ; ; = 200 \mathrm{; ; ; GeV}; ; ; $ with the STAR detector at RHIC. The measurements cover pseudorapidity, $\eta$, in the range $|\eta| < 1.2$ and transverse momenta, $p_\mathrm{; ; ; T}; ; ; $, up to $4 \mathrm{; ; ; GeV}; ; ; /c$. The longitudinal spin transfer is found to be $D_{; ; ; LL}; ; ; = -0.03\pm 0.13(\mathrm{; ; ; stat}; ; ; ) \pm 0.04(\mathrm{; ; ; syst}; ; ; )$ for inclusive $\Lambda$ and $D_{; ; ; LL}; ; ; = -0.12 \pm 0.08(\mathrm{; ; ; stat}; ; ; ) \pm 0.03(\mathrm{; ; ; syst}; ; ; )$ for inclusive $\bar{; ; ; \Lambda}; ; ; $ hyperons with $<\eta> = 0.5$ and $<p_\mathrm{; ; ; T}; ; ; > = 3.7 \mathrm{; ; ; GeV}; ; ; /c$. The dependence on $\eta$ and $p_\mathrm{; ; ; T}; ; ; $ is presented.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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