Probing the gluonic intial state with inclusive dijets in pPb and exclusive dijets in ultra-peripheral PbPb collision at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with the CMS experiment

Jun 2, 2020, 1:35 PM

Oral Presentation Initial State Parallel


Aleksandr Bylinkin (The University of Kansas (US))


Dijet processes can be used in several ways to probe the nuclear initial state. Exclusive dijet photoproduction in ultra-peripheral heavy-ion collisions has recently been suggested as a probe of the gluon Wigner distribution. In particular, the angular correlation of exclusive dijets can asses the azimuthal anisotropy of the gluon distribution in the nuclear target. In this talk we present, for the first time, the measurement of the angular correlations of dijets in ultra-peripheral PbPb collisions at $\sqrt{s_{\rm NN}}$ = 5.02~TeV with the CMS experiment. The dependence of the second harmonic of the angular distribution as a function of the vectorial sum of the leading and subleading jets will be discussed. In addition, the pseudorapidity of the inclusive dijet system in pPb collisions is a probe of the nuclear parton distribution function (nPDF) of the gluon: the recent CMS result will be presented, and its impact on nPDF models will be discussed.

Contribution type Contributed Talk
Collaboration (if applicable) CMS
Track Initial State

Primary author

Serguei Petrushanko (M.V. Lomonosov Moscow State University (RU))

Presentation materials