22-27 September 2016
East Lake International Conference Center
Asia/Chongqing timezone
<a href="http://hp2016.ccnu.edu.cn">http://hp2016.ccnu.edu.cn</a>

Bottomonium suppression in nucleus-nucleus and proton-nucleus collisions

25 Sep 2016, 09:10
20m
Jing-Zhou Hall (East Lake International Conference Center)

Jing-Zhou Hall

East Lake International Conference Center

Donghu Road 142, Wuchang District, Wuhan, Hubei, China

Speaker

Jean-Philippe Lansberg (IPN Orsay, Paris Sud U. / IN2P3-CNRS)

Description

We present the first application of the Comover Interaction Model (CIM) to $\Upsilon(nS)$ production in nucleus-nucleus and proton-nucleus collisions from fixed-target to collider energies. The CIM offers an elegant way to explain the relative suppression of the excited $\Upsilon$ states observed in proton-nucleus collisions at the LHC. From these relative suppressions, we are able to constrain the comover cross sections for the different bottomonium states which encapsulate final-state interactions. Together with initial-state effects, such as the nuclear modification of the parton densities, we obtain significant $\Upsilon(nS)$ suppressions in nucleus-nucleus collisions compared to the expected impact of the colour screening. This renders the interpretation of the sequential-suppression pattern observed by CMS in PbPb collisions more complex to interpret.

Presentation type Oral

Primary author

Jean-Philippe Lansberg (IPN Orsay, Paris Sud U. / IN2P3-CNRS)

Presentation Materials