J/psi polarization in p plus p collisions at root s=200 GeV in STAR

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F14%3A00225677" target="_blank" >RIV/68407700:21340/14:00225677 - isvavai.cz</a>
Alternative codes found
RIV/61389005:_____/14:00439720
Result on the web
<a href="http://dx.doi.org/10.1016/j.physletb.2014.10.049" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2014.10.049</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2014.10.049" target="_blank" >10.1016/j.physletb.2014.10.049</a>

Result language
angličtina
Original language name
J/psi polarization in p plus p collisions at root s=200 GeV in STAR
Original language description
We report on a polarization measurement of inclusive J/psi mesons in the di-electron decay channel at mid-rapidity at 2 < p(T) < 6 GeV/c in p + p collisions at root s = 200 GeV. Data were taken with the STAR detector at RHIC. The J/psi polarization measurement should help to distinguish between different models of the J/psi production mechanism since they predict different p(T) dependences of the J/psi polarization. In this analysis, J/psi is studied in the helicity frame. The polarization parameter lambda(theta) measured at RHIC becomes smaller towards high p(T), indicating more longitudinal J/psi polarization as p(T) increases. The result is compared with predictions of presently available models.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BG - Nuclear, atomic and molecular physics, accelerators
OECD FORD branch
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Project
<a href="/en/project/GA13-20841S" target="_blank" >GA13-20841S: Study of nuclear matter in ultra-relativistic heavy-ion collisions at RHIC</a><br>
Continuities
S - Specificky vyzkum na vysokych skolach

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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