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SUMMARY:Left versus right: A high precision determination of the weak mixi
 ng angle at the P2 experiment at MESA
DTSTART:20250508T080000Z
DTEND:20250508T100000Z
DTSTAMP:20260830T040500Z
UID:indico-event-878@indico.hiskp.uni-bonn.de
DESCRIPTION:Speakers: Frank Maas (Mainz)\n\nAbstract: The theory of eleme
 ntary particle physics\, the Standard Model (SM)\, provides a successful d
 escription of the basic constituents of matter and the forces acting betwe
 en them. However\, it explains only about 15% of the total mass in the uni
 verse\, not accounting for the dark matter postulated in the face of a gro
 wing number of astrophysical and cosmological observations. The study of t
 he universe at large has shown that our theory of the smallest entities of
  Nature must be extended.In the absence of a direct observation of new par
 ticles it has become increasingly important to determine the parameters of
  the SM with the highest possible precision\, as new particles and forces 
 would modify their values through quantum corrections. The existence of t
 he W and Z bosons\, and later the top quark\, the tau neutrino\, and the H
 iggs boson - the ultimate discovery of the SM - could all be inferred from
  precision measurements before their direct observations. A cornerstone pa
 rameter of the SM is the so-called weak mixing angle\, which relates diffe
 rent sectors of the theory in a non-trivial manner and is particularly sen
 sitive to new physics. The P2 experiment is one of the two flagship exper
 iments at the upcoming MESA accelerator in Mainz.  The goal of this proje
 ct is to greatly improve its determination at low energy. Only the combina
 tion of a low energy measurement with the measurements at the Z-pole will 
 test the fundamental energy dependence of the weak mixing angle\, precisel
 y. The interpretation of the weak mixing angle determinations at low energ
 y will test the SM\, and probe new physics with sensitivity to mass scales
  ranging from 70 MeV up to 50 TeV. Further measurements like the neutron d
 istribution in the lead nucleus are  directly connected astrophysical obs
 ervables the size of a neutron star.  Join Zoom Meetinghttps://uni-bonn.
 zoom-x.de/j/66253567797?pwd=R2MrNmNCQnl4K1hSejd6VnBEYXJ2QT09Meeting ID: 66
 2 5356 7797Passcode: 599591\n\nhttps://indico.hiskp.uni-bonn.de/event/878/
LOCATION:Nußallee 12/1.049 (PI) - Conference Room II (PI)
URL:https://indico.hiskp.uni-bonn.de/event/878/
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