Angular decay coefficients of J/psi mesons at forward rapidity from p plus p collisions at root s=510 GeV

Date
2017-05-08
Authors
Adare, Andrew
Apadula, Nicole
Ogilvie, Craig
Campbell, Sarah
Ding, Lei
Hill, John
Hotvedt, Nels
Kempel, Todd
Lajoie, John
Lebedev, Alexandre
Ogilvie, Craig
Patel, Milap
Perry, Joshua
Rinn, Timothy
Rosati, Marzia
Runchey, Jonathan
Sen, Abhisek
Shimomura, M.
Timilsina, Arbin
Whitaker, Shawn
et al.
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Abstract

We report the first measurement of the full angular distribution for inclusive J/psi -> mu(+)mu(-) decays in p + p collisions at root s = 510 GeV. The measurements are made for J/psi transverse momentum 2 < p(T) < 10 GeV /c and rapidity 1.2 < y < 2.2 in the Helicity, Collins-Soper, and Gottfried-Jackson reference frames. In all frames the polar coefficient lambda theta is strongly negative at low p(T) and becomes close to zero at high p(T), while the azimuthal coefficient lambda phi is close to zero at low p(T), and becomes slightly negative at higher p(T). The frame-independent coefficient lambda is strongly negative at all p(T) in all frames. The data are compared to the theoretical predictions provided by nonrelativistic quantum chromodynamics models.

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<p>This is an article from <em>Physical Review D </em>95 (2017): 092003-1, doi:<a href="http://dx.doi.org/10.1103/PhysRevD.95.092003" target="_blank">10.1103/PhysRevD.95.092003</a>. Posted with permission.</p>
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