Vossen Group

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:

https://ff2019.phy.duke.edu/

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

https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.042001

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:

https://arxiv.org/pdf/1810.02435.pdf

…well we already knew that, but it made the list of the three experiments which might revamp the standard model in this article here:

https://www.sciencenews.org/article/new-particle-physics-experiments-revamp-standard-model

Finally, we submitted the paper about our result:

http://inspirehep.net/record/1687566

Anselm Vossen was awarded the DOE Early Career Award.  See press release here.

The paper can be found here:

http://inspirehep.net/record/1663226