QCD with SLD

TL;DR

This paper reports new experimental results from the SLD at SLAC on strong interaction phenomena, including tests of symmetry, gluon splitting rates, B hadron spectra, and rapidity correlations, confirming key aspects of QCD and electroweak theory.

Contribution

It provides novel measurements of gluon splitting into bar{b} pairs, B hadron energy distribution, and detailed rapidity correlations, advancing understanding of QCD and flavor dynamics.

Findings

Gluon splitting rate into bar{b} pairs measured as 0.00307 ± 0.00071 (stat.) ± 0.00066 (syst).

B hadron energy spectrum shape and average < x_B > = 0.714 ± 0.005 (stat.) ± 0.007 (syst.) confirmed.

First observation of baryon number ordering along the qar{q} axis using signed rapidities.

Abstract

We present selected new results on strong interaction physics from the SLD experiment at the SLAC Linear Collider (SLC), symmetry tests of b\bar{b}g vertex, the rate of secondary b\bar{b} production via gluon splitting, the B hadron energy spectrum and rapidity correlations between identified charged hadrons. The parity violation in Z0 --> b\bar{b}g decays is consistent with electroweak theory plus QCD. New tests of T- and CP-conservation at the b\bar{b}g vertex are performed. A new measurement of the rate of gluon splitting into b\bar{b} pairs yields g_{b\bar{b}}=0.00307 +- 0.00071 (stat.) +- 0.00066 (syst.) (Preliminary). The B hadron energy spectrum is measured using a new inclusive technique, allowing tests of predictions for its shape and a measurement of < x_B > = 0.714 +- 0.005 (stat.) +- 0.007 (syst.) (Preliminary). A study of correlations in rapidity between pairs of identified pions, kaons and protons confirms that strangeness and baryon number areconserved locally, and shows local charge conservation between meson-baryon and strange-nonstrange pairs. Flavor-dependent long-range correlations are observed for all combinations of these hadron species. The first study of correlations using signed rapidities is done and find the first direct observation of baryon number ordering along the q\bar{q} axis.