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Report from Charm WG (White Paper  TDR )

Report from Charm WG (White Paper  TDR ). Mixing and CPV in Charm. D. Asner, Carleton U, I. Bigi , U. Notre Dame, F. Martinez Vidal, A. Oyanguren, IFIC, Universitat de Valencia-CSIC N. Neri, Universit`a di Pisa, B. Meadows, M. Sokoloff, R. Andreassen U. Cincinnati M. Blanke,

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Report from Charm WG (White Paper  TDR )

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  1. Report from Charm WG(White Paper  TDR) Mixing and CPV in Charm D. Asner, Carleton U, I. Bigi, U. Notre Dame, F. Martinez Vidal, A. Oyanguren, IFIC, Universitat de Valencia-CSIC N. Neri, Universit`a di Pisa, B. Meadows, M. Sokoloff, R. Andreassen U. Cincinnati M. Blanke, Technische Universitaet Muenchen A. Palano, INFN, Bari Brian Meadows, U. Cincinnati

  2. FCNC, Mixing and CPV in Charm Items Discussed: • Interest in rare decays – D0+- • CPV in Mixing • Projected expectations • Importance of aSL • Running at charm threshold • Time-Dependent Quantum Correlations (TDQC)? • Simulation Wish List Brian Meadows, U. Cincinnati

  3. Interest in D0 +- Brian Meadows, U. Cincinnati

  4. Search for D0 +- • There is considerable theoretical interest in the FCNC decay D0 +-(see I. Bigi’s talk, Friday am) • The SM estimates a lower limit BF > 4 x 10-13 • Estimates would be improved by measurement of D0  • Only estimate so far - BF[D0  ] < 1.5 x 10-5 [Recall that, for KL  +-, SMBF = 6.4 x 10-8 – right on the money!] Long-range mechanism (Dominant in KL +- - NOT necessarily so in D0 case) Brian Meadows, U. Cincinnati

  5. 12k + c qk - u 22k Interest in D0 +- • R-parity SUSY could increase the decay rate by up to to 7 orders to BF~3.5x10-6 • Current experimental limits are: • Super B should be able to arrive at upper limits much better than this and also measure BF[D0 ] to better understand the SM limit. Opens a 7 orders of magnitude search window Brian Meadows, U. Cincinnati

  6. Interest in D0 +- • Ikaros: “10-8 would be an interesting goal” • At D threshold, the +- (or ) are “back-to-back” in transverse momentum and should present an excellent signal-to-noise ratio. [BESIII claim they will use 20 fb-1 to give them a 90% limit at 3 x 10-8 – apparently a mistake] http://arXiv.org/pdf/0801.1833 and Eur.Phys.J.C57:309-492,2008. Brian Meadows, U. Cincinnati

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