@article{513b0588e73449e4beb0a9f80b052623,
title = "Precision e− beam polarimetry at an e+e− B factory using tau-pair events",
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.",
author = "{BABAR Collaboration} and Lees, {J. P.} and V. Poireau and V. Tisserand and E. Grauges and A. Palano and G. Eigen and Brown, {D. N.} and Kolomensky, {Yu G.} and M. Fritsch and H. Koch and R. Cheaib and C. Hearty and Mattison, {T. S.} and McKenna, {J. A.} and So, {R. Y.} and Blinov, {V. E.} and Buzykaev, {A. R.} and Druzhinin, {V. P.} and Kozyrev, {E. A.} and Kravchenko, {E. A.} and Serednyakov, {S. I.} and Skovpen, {Yu I.} and Solodov, {E. P.} and Todyshev, {K. Yu} and Lankford, {A. J.} and B. Dey and Gary, {J. W.} and O. Long and Eisner, {A. M.} and Lockman, {W. S.} and {Panduro Vazquez}, W. and Chao, {D. S.} and Cheng, {C. H.} and B. Echenard and Flood, {K. T.} and Hitlin, {D. G.} and Y. Li and Lin, {D. X.} and S. Middleton and Miyashita, {T. S.} and P. Ongmongkolkul and J. Oyang and Porter, {F. C.} and M. R{\"o}hrken and Meadows, {B. T.} and Sokoloff, {M. D.} and Smith, {J. G.} and Wagner, {S. R.} and D. Bernard and Lange, {D. J.}",
note = "Publisher Copyright: {\textcopyright}=0.0035±0.0024stat±0.0029sys. The systematic uncertainty studies are described in detail, which can serve as a guide for future applications of tau polarimetry. A proposed e- beam longitudinal polarization upgrade to the SuperKEKB e+e- collider would benefit from this technique.",
year = "2023",
month = nov,
day = "1",
doi = "10.1103/PhysRevD.108.092001",
language = "English (US)",
volume = "108",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "9",
}