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Title: Recent QCD Results from SLD

Abstract

We present selected results on strong interaction physics from the SLD experiment at the SLAC Linear Collider. We report on several new studies of 3- and 4-jet hadronic Z{sup 0} decays, in which jets are identified as quark, antiquark or gluon. The 3-jet Z{sup 0} --> b anti-bg rate is sensitive to the b-quark mass; prospects for measuring m{sub b} are discussed. The gluon energy spectrum is measured over the full kinematic range, providing an improved test of QCD and limits on anomalous b anti-bg couplings. The parity violation in Z{sup 0} --> b anti-bg decays is consistent with electroweak theory plus QCD. New tests of T- and CP-conservation at the bbg vertex are performed. A new measurement of the rate of gluon splitting into b anti-b pairs yields g{sub b anti-b} = 0.0031 {+-} 0.0007 (stat.){+-} 0.0006 (syst.) (Preliminary). We also present a number of new results on jet fragmentation into identified hadrons. The B hadron energy spectrum is measured over the full kinematic range using a new, inclusive technique, allowing stringent tests of predictions for its shape and a precise measurement of (xB) = 0.714 {+-} 0.005(stat.) {+-} 0.007(syst.) (Preliminary). A detailed study of correlations in rapidity ymore » between pairs of identified pi{sup {+-}}, K{sup {+-}} and p/anti-p confirms that strangeness and baryon number are conserved 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, yielding new information on leading particle production. The first study of correlations using rapidities signed such that y > 0 corresponds to the quark direction provides additional new insights into fragmentation, including the first direct observation of baryon number ordering along the q anti-q axis.« less

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center, Menlo Park, CA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
15071
Report Number(s):
SLAC-PUB-8259
TRN: US0204529
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 27 Sep 1999
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BARYON NUMBER; CHARGE CONSERVATION; ENERGY; FRAGMENTATION; GLUONS; LEADING PARTICLES; LINEAR COLLIDERS; QUANTUM CHROMODYNAMICS; QUARKS; STRONG INTERACTIONS

Citation Formats

Muller, David. Recent QCD Results from SLD. United States: N. p., 1999. Web. doi:10.2172/15071.
Muller, David. Recent QCD Results from SLD. United States. doi:10.2172/15071.
Muller, David. Mon . "Recent QCD Results from SLD". United States. doi:10.2172/15071. https://www.osti.gov/servlets/purl/15071.
@article{osti_15071,
title = {Recent QCD Results from SLD},
author = {Muller, David},
abstractNote = {We present selected results on strong interaction physics from the SLD experiment at the SLAC Linear Collider. We report on several new studies of 3- and 4-jet hadronic Z{sup 0} decays, in which jets are identified as quark, antiquark or gluon. The 3-jet Z{sup 0} --> b anti-bg rate is sensitive to the b-quark mass; prospects for measuring m{sub b} are discussed. The gluon energy spectrum is measured over the full kinematic range, providing an improved test of QCD and limits on anomalous b anti-bg couplings. The parity violation in Z{sup 0} --> b anti-bg decays is consistent with electroweak theory plus QCD. New tests of T- and CP-conservation at the bbg vertex are performed. A new measurement of the rate of gluon splitting into b anti-b pairs yields g{sub b anti-b} = 0.0031 {+-} 0.0007 (stat.){+-} 0.0006 (syst.) (Preliminary). We also present a number of new results on jet fragmentation into identified hadrons. The B hadron energy spectrum is measured over the full kinematic range using a new, inclusive technique, allowing stringent tests of predictions for its shape and a precise measurement of (xB) = 0.714 {+-} 0.005(stat.) {+-} 0.007(syst.) (Preliminary). A detailed study of correlations in rapidity y between pairs of identified pi{sup {+-}}, K{sup {+-}} and p/anti-p confirms that strangeness and baryon number are conserved 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, yielding new information on leading particle production. The first study of correlations using rapidities signed such that y > 0 corresponds to the quark direction provides additional new insights into fragmentation, including the first direct observation of baryon number ordering along the q anti-q axis.},
doi = {10.2172/15071},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {9}
}

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