The CP-conserving direction | Zendy

Mari Carmen Bañuls | Zendy; J. Bernabéu | Zendy

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The CP-conserving direction

Author(s) -

Mari Carmen Bañuls,

J. Bernabéu

Publication year - 1999

Publication title -

journal of high energy physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.998

H-Index - 261

eISSN - 1126-6708

pISSN - 1029-8479

DOI - 10.1088/1126-6708/1999/06/032

Subject(s) - unitarity , invariant (physics) , cp violation , physics , mixing (physics) , hierarchy , transformation (genetics) , particle physics , operator (biology) , lagrangian , mathematics , mathematical physics , pure mathematics , quantum mechanics , biochemistry , chemistry , repressor , economics , transcription factor , market economy , gene

A symmetry transformation is well defined in the case of an invariant theory,being the corresponding operator undetermined otherwise. However, we show that,even with CP violation, it is possible to determine the CP transformation byseparating the Lagrangian of the Standard Model in a CP-conserving and aCP-violating part, in a unique way, making use of the empirically known quarkmixing hierarchy. To order \lambda^3 for the Bd-system, the CP-conservingdirection matches one of the sides of the (bd) unitarity triangle. We use thisdetermination to calculate the rephasing invariant parameter \epsilon, whichmeasures CP-mixing in the B0-B0bar system.Comment: 12 pages, no figure. Version to appear in JHE

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