### Abstract

Inspired by the recent Georgi's unparticle proposal, we study the flavor structures of the Standard Model (SM) particles when they couple to unparticles. At a very high energy scale, we introduce BZ charges for the SM particles, which are universal for each generation and allow BZ fields to distinguish flavor generations. At the Λ_{U} scale, BZ operators and charges are matched onto unparticle operators and charges, respectively. In this scenario, we find that tree flavor changing neutral currents (FCNCs) can be induced by the rediagonalizations of the SM fermions. As an illustration, we employ the Fritzsch ansatz to the SM fermion mass matrices and we find that the FCNC effects could be simplified to be associated with the mass ratios denoted by sqrt(m_{i} m_{j} / m_{3}
^{2}), where m_{3} is the mass of the heaviest particle in each type of fermion generations and i, j are the flavor indices. In addition, we show that there is no new CP violating phase for FCNCs in down type quarks beside the unique one in the CKM matrix. We use over(B, ̄)_{q} → ℓ^{+} ℓ^{-} as examples to display the new FCNC effects. In particular, we demonstrate that the direct CP asymmetries in the decays can be O (10 %) due to the peculiar CP conserving phase in the unparticle propagator.

Original language | English |
---|---|

Pages (from-to) | 118-123 |

Number of pages | 6 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 661 |

Issue number | 2-3 |

DOIs | |

Publication status | Published - 2008 Mar 20 |

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### All Science Journal Classification (ASJC) codes

- Nuclear and High Energy Physics

### Cite this

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*,

*661*(2-3), 118-123. https://doi.org/10.1016/j.physletb.2008.01.072

}

*Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics*, vol. 661, no. 2-3, pp. 118-123. https://doi.org/10.1016/j.physletb.2008.01.072

**Flavors and phases in unparticle physics.** / Chen, Chuan-Hung; Geng, Chao Qiang.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Flavors and phases in unparticle physics

AU - Chen, Chuan-Hung

AU - Geng, Chao Qiang

PY - 2008/3/20

Y1 - 2008/3/20

N2 - Inspired by the recent Georgi's unparticle proposal, we study the flavor structures of the Standard Model (SM) particles when they couple to unparticles. At a very high energy scale, we introduce BZ charges for the SM particles, which are universal for each generation and allow BZ fields to distinguish flavor generations. At the ΛU scale, BZ operators and charges are matched onto unparticle operators and charges, respectively. In this scenario, we find that tree flavor changing neutral currents (FCNCs) can be induced by the rediagonalizations of the SM fermions. As an illustration, we employ the Fritzsch ansatz to the SM fermion mass matrices and we find that the FCNC effects could be simplified to be associated with the mass ratios denoted by sqrt(mi mj / m3 2), where m3 is the mass of the heaviest particle in each type of fermion generations and i, j are the flavor indices. In addition, we show that there is no new CP violating phase for FCNCs in down type quarks beside the unique one in the CKM matrix. We use over(B, ̄)q → ℓ+ ℓ- as examples to display the new FCNC effects. In particular, we demonstrate that the direct CP asymmetries in the decays can be O (10 %) due to the peculiar CP conserving phase in the unparticle propagator.

AB - Inspired by the recent Georgi's unparticle proposal, we study the flavor structures of the Standard Model (SM) particles when they couple to unparticles. At a very high energy scale, we introduce BZ charges for the SM particles, which are universal for each generation and allow BZ fields to distinguish flavor generations. At the ΛU scale, BZ operators and charges are matched onto unparticle operators and charges, respectively. In this scenario, we find that tree flavor changing neutral currents (FCNCs) can be induced by the rediagonalizations of the SM fermions. As an illustration, we employ the Fritzsch ansatz to the SM fermion mass matrices and we find that the FCNC effects could be simplified to be associated with the mass ratios denoted by sqrt(mi mj / m3 2), where m3 is the mass of the heaviest particle in each type of fermion generations and i, j are the flavor indices. In addition, we show that there is no new CP violating phase for FCNCs in down type quarks beside the unique one in the CKM matrix. We use over(B, ̄)q → ℓ+ ℓ- as examples to display the new FCNC effects. In particular, we demonstrate that the direct CP asymmetries in the decays can be O (10 %) due to the peculiar CP conserving phase in the unparticle propagator.

UR - http://www.scopus.com/inward/record.url?scp=39949084464&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=39949084464&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2008.01.072

DO - 10.1016/j.physletb.2008.01.072

M3 - Article

AN - SCOPUS:39949084464

VL - 661

SP - 118

EP - 123

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 2-3

ER -