This report details the progress made in by the SuperB Project in the area of the Collider since the publication of the SuperB Conceptual
No abstract
This document reviews the physics program of the KLOE-2 detector at DAΦNE upgraded in energy and provides a simple solution to run the collider above the φpeak (up to 2, possibly 2.5 GeV). It is shown how a precise measurement of the multihadronic cross section in the energy region up to 2 (possibly 2.5) GeV would have a major impact on the tests of the Standard Model through a precise determination of the anomalous magnetic moment of the muon and the effective fine-structure constant at the M Z scale. With a luminosity of about 10 32 cm −2 s −1 , DAΦNE upgraded in energy can perform a scan in the region from 1 to 2.5 GeV in one year by collecting an integrated luminosity of 20 pb −1 (corresponding to a few days of data taking) for single point, assuming an energy step of 25 MeV. A few years of data taking in this region would provide important tests of QCD and effective theories by γγ physics with open thresholds for pseudo-scalar (like the η ′ ), scalar (f 0 , f ′ 0 , etc...) and axial-vector (a 1 , etc...) mesons; vector-mesons spectroscopy and baryon form factors; tests of CVC and searches for exotics. In the final part of the document a technical solution for the energy upgrade of DAΦNE is proposed.
We are studying a novel scheme to produce muon beams characterised by very low emittance, thus allowing to avoid the need for cooling, using a positron beam of about 45 GeV interacting on electrons on a fixed target. This is a challenging scheme, and a full design study has to be developed. One of the key innovative topics to be investigated regards the interaction between the positron beam stored in a low emittance ring with a thin target inserted directly in the ring chamber. Produced muons will then be immediately collected at the exit of the target and transported to two µ + and µ − accumulator rings. In this paper, after an introduction highlighting the rational in designing a muon collider, we discuss in detail this new muon production scheme, covering the simulation of the e+ beam interacting with the target, its degradation in the 6-D phase space and the optimisation of the e+ ring design mainly to maximise the energy acceptance.
This paper is based on the outcome of the activity that has taken place during the recent workshop on "SuperB in Italy" held in Frascati on November 11-12, 2005. The workshop was opened by a theoretical introduction of Marco Ciuchini and was structured in two working groups. One focused on the machine and the other on the detector and experimental issues. *The present status on CP is mainly based on the results achieved by BABAR and Belle. Estabilishment of the indirect CP violation in B sector in 2001 and of the direct CP violation in 2004 thanks to the success of PEP-II and KEKB e + e − asymmetric B Factories operating at the center of mass energy corresponding to the mass of the Υ(4S ). With the two B Factories taking data, the Unitarity Triangle is now beginning to be overconstrained by improving the measurements of the sides and now also of the angles α, and γ. We are also in presence of the very intriguing results about the measurements of sin2β in the time dependent analysis of decay channels via penguin loops, where b → sss and b → sdd. τ physics, in particular LFV search, as well as charm and ISR physics are important parts of the scientific program of a SuperB Factory. The physics case together with possible scenarios for the high luminosity SuperB Factory based on the concepts of the Linear Collider and the related experimental issues are discussed.
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