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Associated $W^{\pm}D^{(*)}$ production at the LHC and prospects to observe double parton interactions

S. P. Baranov, A. V. Lipatov, M. A. Malyshev, A. M. Snigirev, N. P. Zotov

TL;DR

The paper studies the associated production of a $W^{\pm}$ boson and a charmed meson in $pp$ collisions at the LHC using $k_T$-factorization to incorporate initial-state radiation. It validates the approach by comparing to ATLAS measurements of the OS-SS difference in $WD$ production, finding reasonable agreement. It then extends the analysis to same-sign $W^{\pm}D^{\pm}$ final states, evaluating both single-parton scattering and double-parton scattering contributions, and shows that DPS can dominate in these channels, suggesting the SS configuration as a practical DPS indicator with cross sections of a few pb in the fiducial region. The study discusses background suppression via displaced-vertex tagging and highlights the particularly strong DPS signal in $W^{\pm}D^{*\pm}$ final states, underscoring the potential for observing DPS in this channel. Overall, the work demonstrates a viable method to probe double parton interactions at the LHC through $W^{\pm}D^{(*)}$ production.

Abstract

Associated production of charged gauge bosons and charged charmed mesons at the LHC is considered in the framework of $k_T$-factorization approach. Theoretical predictions are compared with ATLAS data, and reasonably good agreement is found. Predictions on the same-sign $W^{\pm}D^{\pm}$ configurations are presented including single parton scattering and double parton scattering contributions. The latter are shown to dominate over the former, thus giving evidence that the proposed process can serve as another indicator of double parton interactions.

Associated $W^{\pm}D^{(*)}$ production at the LHC and prospects to observe double parton interactions

TL;DR

The paper studies the associated production of a boson and a charmed meson in collisions at the LHC using -factorization to incorporate initial-state radiation. It validates the approach by comparing to ATLAS measurements of the OS-SS difference in production, finding reasonable agreement. It then extends the analysis to same-sign final states, evaluating both single-parton scattering and double-parton scattering contributions, and shows that DPS can dominate in these channels, suggesting the SS configuration as a practical DPS indicator with cross sections of a few pb in the fiducial region. The study discusses background suppression via displaced-vertex tagging and highlights the particularly strong DPS signal in final states, underscoring the potential for observing DPS in this channel. Overall, the work demonstrates a viable method to probe double parton interactions at the LHC through production.

Abstract

Associated production of charged gauge bosons and charged charmed mesons at the LHC is considered in the framework of -factorization approach. Theoretical predictions are compared with ATLAS data, and reasonably good agreement is found. Predictions on the same-sign configurations are presented including single parton scattering and double parton scattering contributions. The latter are shown to dominate over the former, thus giving evidence that the proposed process can serve as another indicator of double parton interactions.

Paper Structure

This paper contains 4 sections, 14 equations, 1 figure, 1 table.

Table of Contents

  1. Introduction
  2. Theoretical framework. Comparison with ATLAS data.
  3. Same-sign $W^{\pm}D^{\pm}$ states and double parton interactions
  4. Conclusions

Figures (1)

  • Figure 1: Kinematic correlations between muons and $D$-mesons in same-sign events ($\mu^\pm D^\pm$) at ATLAS conditions: distributions in the azimuthal angle difference $\Delta\phi$ (upper panel) and rapidity difference $\Delta y$ (lower panel). The different contributions are represented by: solid curve, double parton scattering; upper dotted curve, $gg{\to}t\bar{t}$; lower dotted curve, $q\bar{q}{\to}t\bar{t}$; dashed curve, $u\bar{d}{\to}Wc\bar{c}$ and $d\bar{u}{\to}Wc\bar{c}$; dash-dotted curve, $gu{\to}Wdc\bar{c}$ and $gd{\to}Wuc\bar{c}$.