Light Quark Fragmentation in Polarized Z0 Decays at SLD
M. Kalelkar
Abstract
We report results on two physics topics from the SLD experiment at the SLAC Linear Collider, using our full sample of 550,000 events of the type e+e- --> Z0 --> q-q(bar). The electron beam was polarized, enabling the quark and antiquark hemispheres to be tagged in each event. One physics topic is the first study of rapidities signed such that positive rapidity is along the quark rather than antiquark direction. Distributions of ordered differences in signed rapidity between pairs of particles are analyzed, providing the first direct observation of baryon number ordering along the q-q(bar) axis. The other topic is the first direct measurement of As, the parity-violating coupling of the Z0 to strange quarks, by measuring the left-right forward-backward production asymmetry in polar angle of the tagged s-quark. We obtain As = 0.895 +- 0.066(stat.) +- 0.062(syst.), which is consistent with the Standard Model and is currently the most precise measurement of this quantity.
Create a lesson
Related papers
Projected sensitivity of the detector to photophobic and fermion-coupled axion-like particles
Riley Aumonier, Oleg Brandt, Theo Reymermier et al.
Search for heavy neutral leptons in top quark decays with same-sign, same-flavor dilepton final states in proton-proton collisions at s = 13 TeV
CMS Collaboration
A New Precise Measurement of the e+e-π+π-(γ) Cross Section with the Initial-State Radiation Method at BaBar
BaBar Collaboration
A New Precise Measurement of the e+e-π+π-(γ) Cross Section with the Initial-State Radiation Method at BaBar
BaBar Collaboration
A New Bound on Light-by-Light Scattering in the Low-Energy Regime
Aimé Matheron, Michal Šmíd, Felix Karbstein et al.
Constraints on a Long-Lived X17 Vector Boson with FASER
FASER Collaboration, Roshan Mammen Abraham, Xiaocong Ai et al.