We present a new technique, "tau polarimetry,"for measuring the longitudinal beam polarization present in an e+e- collider through the analysis of e+e-→τ+τ- events. By exploiting the sensitivity of τ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using 424.2±1.8 fb-1 of BABAR data at s=10.58 GeV, the average longitudinal polarization of the PEP-II e+e- collider has been measured to be ⟨P.

Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2023). Precision e- beam polarimetry at an e+e- B factory using tau-pair events. PHYSICAL REVIEW D, 108(9) [10.1103/PhysRevD.108.092001].

Precision e- beam polarimetry at an e+e- B factory using tau-pair events

Carpinelli M.;
2023

Abstract

We present a new technique, "tau polarimetry,"for measuring the longitudinal beam polarization present in an e+e- collider through the analysis of e+e-→τ+τ- events. By exploiting the sensitivity of τ decay kinematics to the longitudinal polarization of the beams, we demonstrate that the longitudinal polarization can be measured with a 3 per mil systematic uncertainty at the interaction point using a technique that is independent of spin and beam transport modeling. Using 424.2±1.8 fb-1 of BABAR data at s=10.58 GeV, the average longitudinal polarization of the PEP-II e+e- collider has been measured to be ⟨P.
Articolo in rivista - Articolo scientifico
Anomalous; Dipole Moments; Decay Product
English
2023
108
9
092001
none
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2023). Precision e- beam polarimetry at an e+e- B factory using tau-pair events. PHYSICAL REVIEW D, 108(9) [10.1103/PhysRevD.108.092001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/471398
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