S-ACOT-MPS:
The Simplified ACOT scheme with Massive Phase Space

A single inclusive heavy-quark production

We develop the Simplified Aivazis-Collins-Olness-Tung scheme with Massive Phase Space (S-ACOT-MPS) to deal with heavy-flavor hadroproduction, especially at the LHC. The heavy flavor can be produced through Flavor Creation (FC) or Flavor Excitation (FE) mechanisms. The overlapped contribution between the FC and FE terms is subtracted by an asymptotic term. We implement this scheme up to Next-to the Leading Order (NLO) in the platform of MCFM and apply it for the inclusive b-flavor production, which describes the B-meson production at the LHCb well. Our scheme can be potentially extended to NNLO straight-forwardly.

For fast NLO computations, we have generated the APPLgrids to calculate the heavy-flavor transverse momentum and rapidity for the FC and FC (SB) terms seperately, with the configuration of b-quark production at the LHCb 7 and 13 TeV. The grids and corresponding convolution code written in C++ can be found here.

For more details, please refer the following publication:

To obtain the codes, please go to Downloads or GitHub.

Talks

The (S-)ACOT scheme for the Z+b production at hadron colliders

The (Simplified) ACOT General Mass Variable Flavor Number schemes are developed for proton-proton collisions and applied to Z-boson production in association with heavy-quark at the LHC. The implementation of these factorization schemes uses Subtraction and Residual heavy-quark parton distribution functions (HQ-PDFs) which are introduced to facilitate the calculation. Subtraction and Residual are provided in the LHAPDF6 format and can be downloaded here.

For more details, please refer the following publication:

Talks

Plots