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Novel CP Violation Technique in Tau Decays: Experimental Details and Results

Explore novel CP violation technique in tau decays with data analysis at 90% CL, using Monte Carlo simulations to determine key parameters. Results suggest potential scalar-mediated decays in the search for CP violation.

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Novel CP Violation Technique in Tau Decays: Experimental Details and Results

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  1. Experimental details • Select   0 decays •  Ldt  13.3 fb1 = 12.2 x 106-pairs @ s (4S) ee    • BKG’s : 0 a1 Total contamination from other  decays = 10% ee  qq  negligible ee  ee To lowest order  = c • Use MC to determine c 6

  2. Introduction Familiar story: • CPV observed in K-system (KS, KL) • CPV sought/expected in B-system (B  KS) • CPV searches in ,  decays less popular Novel CPV search technique in  decays • Overall technique is general • Easily interpretable in MHDM • Search done w/ CLEO detector A1 A2eiei A = + CPeven CPodd P  |A|2 = A12 + A22 + 2A1A2coscos - 2A1A2sinsin CPodd CPV: sin sin  0 2

  3. Data  Distribution SM Monte Carlo fs = 1 fs = BW[a0(980)] fs = BW[a0(1450)]  x 103  @ 90% CL f  x 102  0.8  1.4  0.046 <  < 0.022 fs = 1 1.2  2.1 fs = BW[a0(980)]  0.008 <  < 0.006  0.6  2.4  0.1  0.4  0.019 <  < 0.021 fs = BW[a0(1450)] 0.1  1.2 0.2  1.2 7

  4. dN() dN( +) d cos* d cos* Search for Scalar Mediated  Decays • SM: W-exchange: dN/d cos0 = a + b cos20  =helicity angle • non-SM w/ scalar exchanges: dN/d cos0 = a + ( c1Re() + c2Im() ) cos0 + b cos20 •  direction unknown, switch to *  c2Im() cos *   0.033 < Im() < 0.089 @ 90% CL 9

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