Speaker
Sara Taheri Monfared
(DESY)
Description
We present the first determination of transverse momentum dependent (TMD) photon densities with the Parton Branching (PB) method. The photon distribution is generated perturbatively without intrinsic photon component. The input parameters for quarks and gluons are determined from fits to precision measurements of deep inelastic scattering (DIS) cross sections at HERA. The TMD densities are used to predict the mass and transverse momentum spectra of very high mass Drell-Yan (DY) production from both DY ($p p \rightarrow l^+ l^-$) and photon initiated ($\gamma \gamma \rightarrow l^+ l^-$) processes at the LHC. The role of strong coupling in low transverse momentum spectrum is also studied.
