109 research outputs found
The FCC-ee study: Progress and challenges
The FCC (Future Circular Collider) study represents a vision for the next
large project in high energy physics, comprising an 80-100 km tunnel that can
house a future 100 TeV hadron collider. The study also includes a high
luminosity e+e- collider operating in the centre-of-mass energy range of 90-350
GeV as a possible intermediate step, the FCC-ee. The FCC-ee aims at definitive
electro-weak precision measurements of the Z, W, H and top particles, and
search for rare phenomena. Although FCC-ee is based on known technology, the
goal performance in luminosity and energy calibration make it quite
challenging. During 2014 the study went through an exploration phase. The study
has now entered its second year and the aim is to produce a conceptual design
report during the next three to four years. We here report on progress since
the last IPAC conference.Comment: Poster presented at IPAC15,Richmond, VA, USA, May 201
Status of the Super-B factory Design
The SuperB international team continues to optimize the design of an
electron-positron collider, which will allow the enhanced study of the origins
of flavor physics. The project combines the best features of a linear collider
(high single-collision luminosity) and a storage-ring collider (high repetition
rate), bringing together all accelerator physics aspects to make a very high
luminosity of 10 cm sec. This asymmetric-energy collider
with a polarized electron beam will produce hundreds of millions of B-mesons at
the (4S) resonance. The present design is based on extremely low
emittance beams colliding at a large Piwinski angle to allow very low
without the need for ultra short bunches. Use of crab-waist
sextupoles will enhance the luminosity, suppressing dangerous resonances and
allowing for a higher beam-beam parameter. The project has flexible beam
parameters, improved dynamic aperture, and spin-rotators in the Low Energy Ring
for longitudinal polarization of the electron beam at the Interaction Point.
Optimized for best colliding-beam performance, the facility may also provide
high-brightness photon beams for synchrotron radiation applications
Precise measurement of and between 1.84 and 3.72 GeV at the KEDR detector
The present work continues a series of the KEDR measurements of the value
that started in 2010 at the VEPP-4M collider. By combining new data
with our previous results in this energy range we measured the values of
and at nine center-of-mass energies between 3.08 and 3.72
GeV. The total accuracy is about or better than at most of energy
points with a systematic uncertainty of about . Together with the
previous precise measurement at KEDR in the energy range 1.84-3.05 GeV, it
constitutes the most detailed high-precision measurement near the
charmonium production threshold.Comment: arXiv admin note: text overlap with arXiv:1610.02827 and substantial
text overlap with arXiv:1510.0266
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