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Measurement of the B+ production cross section in p-pbar collisions at sqrt(s) = 1960 GeV

CDF Collaboration

TL;DR

This paper reports a new measurement of the B^+ production cross section in par{p} collisions at √s = 1960 GeV using exclusive B^+ → J/ψ K^+ decays with the CDF II detector. The analysis uses 739 pb^-1 of data to reconstruct J/ψ via μ^+ μ^- and combine with kaon tracks, extracting dσ/dp_T in five p_T bins and the integrated cross section for p_T ≥ 6 GeV/c, |y| ≤ 1. The result, σ_B^+(p_T ≥ 6 GeV/c, |y| < 1) = 2.78 ± 0.24 μb, is consistent with NLO and FONLL predictions within uncertainties and aligns with other J/ψ-based Tevatron measurements, helping to clarify previously observed discrepancies. The study combines data-driven efficiency calibrations with MC-based acceptances to provide a robust determination of B^+ production rates at the Tevatron.

Abstract

We present a new measurement of the $B^+$ meson differential cross section $dσ/d p_T$ at $\sqrt{s}=1960$ GeV. The data correspond to an integrated luminosity of 739pb$^{-1}$ collected with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider. $B^+$ candidates are reconstructed through the decay $B^+ \to J/ψK^+$, with $J/ψ\to μ^+ μ^-$. The integrated cross section for producing $B^+$ mesons with $p_T \geq 6$ GeV/c and $|y| \leq 1$ is measured to be $2.78 \pm 0.24 μ$b

Measurement of the B+ production cross section in p-pbar collisions at sqrt(s) = 1960 GeV

TL;DR

This paper reports a new measurement of the B^+ production cross section in par{p} collisions at √s = 1960 GeV using exclusive B^+ → J/ψ K^+ decays with the CDF II detector. The analysis uses 739 pb^-1 of data to reconstruct J/ψ via μ^+ μ^- and combine with kaon tracks, extracting dσ/dp_T in five p_T bins and the integrated cross section for p_T ≥ 6 GeV/c, |y| ≤ 1. The result, σ_B^+(p_T ≥ 6 GeV/c, |y| < 1) = 2.78 ± 0.24 μb, is consistent with NLO and FONLL predictions within uncertainties and aligns with other J/ψ-based Tevatron measurements, helping to clarify previously observed discrepancies. The study combines data-driven efficiency calibrations with MC-based acceptances to provide a robust determination of B^+ production rates at the Tevatron.

Abstract

We present a new measurement of the meson differential cross section at GeV. The data correspond to an integrated luminosity of 739pb collected with the upgraded CDF detector (CDF II) at the Fermilab Tevatron collider. candidates are reconstructed through the decay , with . The integrated cross section for producing mesons with GeV/c and is measured to be b

Paper Structure

This paper contains 8 sections, 3 equations, 10 figures, 3 tables.

Table of Contents

  1. Introduction
  2. The CDF II detector
  3. Data selection and $B^\pm$ reconstruction
  4. Differential cross section
  5. Acceptances and Efficiencies
  6. Results
  7. Conclusions
  8. Acknowledgments

Figures (10)

  • Figure 1: Invariant mass distribution of all $B^\pm$ candidates. The line represents a fit to the data using a first order polynomial plus a Gaussian function in order to estimate the background and the $B^\pm$ signal, respectively.
  • Figure 2: Invariant mass distribution of $B^\pm$ candidates with $6\leq p_T \leq 9 \; {\rm GeV/c}$. The line represents the best fit to the data described in the text.
  • Figure 3: Invariant mass distribution of $B^\pm$ candidates with $9\leq p_T \leq 12 \; {\rm GeV/c}$. The line represents the best fit to the data described in the text.
  • Figure 4: Invariant mass distribution of $B^\pm$ candidates with $12\leq p_T \leq 15 \; {\rm GeV/c}$. The line represents the best fit to the data described in the text.
  • Figure 5: Invariant mass distribution of $B^\pm$ candidates with $15\leq p_T \leq 25 \; {\rm GeV/c}$. The line represents the best fit to the data described in the text.
  • ...and 5 more figures