18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

A Polarized Electron Beam Upgrade to SuperKEKB Enabling Precision Electroweak Measurements

21 Oct 2021, 08:40
Room 303-304 (Kunibiki Messe)

Room 303-304

Kunibiki Messe

Parallel Session Presentation Future facilities and experiments Future facilities and experiments


Dr Michael Roney (University of Victoria)


Consideration is being given to upgrading the SuperKEKB e$^+$e$^-$ collider with polarized electron beams, which would open a new program of precision electroweak physics at a centre-of-mass energy of 10.58GeV, the mass of the $\Upsilon(4S)$. These measurements include $\sin^2\theta_W$ obtained via left-right asymmetry measurements of e$^+$e$^-$ transitions to pairs of electrons, muons, taus, charm and b-quarks. The precision obtainable at SuperKEKB will match that of the LEP/SLC world average and will thereby probe the neutral current couplings with unprecedented precision at a new energy scale sensitive to the running of the couplings. At SuperKEKB the measurements of the individual neutral current vector coupling constants to b-quarks and c-quarks and muons in particular will be substantially more precise than current world averages and the current 3$\sigma$ discrepancy between the SLC A$_{LR}$ measurements and LEP A$_{FB}^b$ measurements of $\sin^2\theta_W^{eff}$ will be addressed. This presentation will cover the necessary upgrades to SuperKEKB to achieve and measure the polarization in the SuperKEKB electron beam.

Primary author

Dr Michael Roney (University of Victoria)

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