arXiv subjects

Kieran Boyle

Publications and source records attributed to Kieran Boyle.

3 recordsLinked to original sources

arXiv2009

First Measurement of the Interference Fragmentation Function in $e^+e^-$ at Belle

A first measurement of the di-hadron interference fragmentation function of light quarks in pion pairs with the Belle detector is presented. The chiral odd nature of this fragmentation function allows the use as a quark polarimeter sensitive to the transverse polarization of the fragmenting quark. Therefore it can be used together with data taken at fixed target and collider experiments to extract the quark transversity distribution. A sample consisting of $711 \times 10^6$ di-hadron pairs was extracted from 661 $fb^{-1}$ of data recorded near the $Υ(4S)$ resonance delivered by the KEKB $e^+$$e^{-}$ collider.

hep-ex↗

arXiv2007

Double Longitudinal Spin Asymmetry in Neutral Pion Production in Polarized p+p Collisions at sqrt(s)=200 GeV at PHENIX

A major goal of the RHIC spin program is to measure Δg, the gluon contribution to the proton's spin. Measurements by PHENIX of the double longitudinal spin asymmetry, A_LL, of the neutral pion production at mid-rapidity in polarized proton collisions have been shown to constrain Δg. Results from the 2005 RHIC run, as well as high p_T data from the 2006 RHIC run, are presented. The results disfavor maximal positive and negative values of Δg. A measurement of azimuthally independent double transverse spin asymmetry, A_TT, is also presented.

hep-ex↗

arXiv2006

Neutral Pion Double Longitudinal Spin Asymmetry in Proton-Proton Collisions at sqrt(s)=200 GeV Using the PHENIX Detector

New results from polarized p-p collisions at sqrt(s)=200 GeV of double longitudinal spin asymmetry in pi0 production using the PHENIX detector in the 2005 RHIC run are presented. Both positive and negative maximal gluon polarization scenarios are inconsistent with the data. The data is consistent with small |Δg|, including Δg=0.

nucl-ex↗