First observation of the the Collins effect for neutral pions and eta mesons submitted for publication
This paper is based on the thesis of Hairong Li
From the abstract:
This work reports the first observation of azimuthal asymmetries around the thrust axis in
Thanks for a successful workshop!
Our group is organizing an international workshop on hadronization phenomena at Duke, March 14-16, 2019.
All interested are welcome to attend:
Chris explored the spin structure of the proton in p+p collisions at RHIC and is now using novel probes to study quark-gluon correlations with the CLAS12 detector
I just came back from the Division of Nuclear Physics meeting of the APS where I could show our first data on beam spin asymmetries from hadron pairs:
This plot shows the asymmetry vs. x Bjorken (roughly the momentum that the struck quark carries of the parent nucleon). There is a very suggestive rise of the measurement that can be interpreted as the force that the gluons exert on a transversely polarized quark as it moves through the proton after being struck.
This is quite interesting since it open up a window to quark-gluon interactions inside the proton and because our understanding is that quarks can only have transverse polarization in an unpolarized nucleon if they also carry transverse momentum (Boer-Mulders effect).
More background can be found in my recent write-up here:
…well we already knew that, but it made the list of the three experiments which might revamp the standard model in this article here:
Finally, we submitted the paper about our result:
Anselm Vossen was awarded the DOE Early Career Award. See press release here.