Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

Unpolarized gluon PDF for the proton using the twisted mass formulation

Aug 10, 2022, 4:30 PM
CP1-HSZ/Ground-0.010 - HS2 (CP1-HSZ)

CP1-HSZ/Ground-0.010 - HS2


Oral Presentation Hadron Structure Hadron Structure


Joseph Delmar (Temple University)


We present results of the x-dependence of the unpolarized gluon PDF for the proton. We use an $N_f = 2+1+1$ ensemble of maximally twisted mass fermions with clover improvement and the Iwasaki improved gluon action. The quark masses are tuned so that the pion mass is $260$ MeV. We use a $32^3 \times 64$ lattice size with a lattice spacing $a=0.093$ fm giving a spatial extent of $3$ fm. We employ the pseudo-distribution approach and obtain the light-cone Ioffe time distribution (ITD) combining data for nucleon momentum boosts up to $1.67$ GeV and Wilson line length, $z$, up to $0.56$ fm. We explore systematic effects such as the dependence on the maximum value of $z$ entering the fits to obtain the ITD. We also study various options to reconstruct the x-dependence of the gluon PDF.

Primary author

Joseph Delmar (Temple University)


Constantia Alexandrou Krzysztof Cichy (Faculty of Physics, Adam Mickiewicz University) Martha Constantinou (Temple University) Kyriakos Hadjiyiannakou (University of Cyprus)

Presentation materials