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Title: New Physics Contributions to the Lifetime Difference in D{sup 0}-D{sup 0} Mixing

Abstract

We present the first general analysis of New Physics contributions to the D{sup 0}-D{sup 0} lifetime difference (equivalently {delta}{gamma}{sub D}). We argue that New Physics (NP) contributions to |{delta}C|=1 processes can dominate the lifetime difference in the flavor SU(3) limit. We provide several specific examples of models that produce sizable effects in {delta}{gamma}{sub D} for realistic values of light quark masses, even if such NP contributions are undetectable in the current round of D{sup 0} decay experiments. This makes {delta}{gamma}{sub D} a viable observable for studies of indirect effects of New Physics.

Authors:
 [1];  [2];  [3];  [4];  [4]
  1. Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
  2. Department of Physics and Astronomy, University of Hawaii at Manoa, Honolulu, Hawaii 96822 (United States)
  3. Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
20951328
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevLett.98.181801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; D NEUTRAL MESONS; D QUARKS; FLAVOR MODEL; LIFETIME; MASS; PARTICLE DECAY; SU-3 GROUPS; U QUARKS

Citation Formats

Golowich, Eugene, Pakvasa, Sandip, Petrov, Alexey A., Michigan Center for Theoretical Physics, and University of Michigan, Ann Arbor, Michigan 48109. New Physics Contributions to the Lifetime Difference in D{sup 0}-D{sup 0} Mixing. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.181801.
Golowich, Eugene, Pakvasa, Sandip, Petrov, Alexey A., Michigan Center for Theoretical Physics, & University of Michigan, Ann Arbor, Michigan 48109. New Physics Contributions to the Lifetime Difference in D{sup 0}-D{sup 0} Mixing. United States. doi:10.1103/PHYSREVLETT.98.181801.
Golowich, Eugene, Pakvasa, Sandip, Petrov, Alexey A., Michigan Center for Theoretical Physics, and University of Michigan, Ann Arbor, Michigan 48109. Fri . "New Physics Contributions to the Lifetime Difference in D{sup 0}-D{sup 0} Mixing". United States. doi:10.1103/PHYSREVLETT.98.181801.
@article{osti_20951328,
title = {New Physics Contributions to the Lifetime Difference in D{sup 0}-D{sup 0} Mixing},
author = {Golowich, Eugene and Pakvasa, Sandip and Petrov, Alexey A. and Michigan Center for Theoretical Physics and University of Michigan, Ann Arbor, Michigan 48109},
abstractNote = {We present the first general analysis of New Physics contributions to the D{sup 0}-D{sup 0} lifetime difference (equivalently {delta}{gamma}{sub D}). We argue that New Physics (NP) contributions to |{delta}C|=1 processes can dominate the lifetime difference in the flavor SU(3) limit. We provide several specific examples of models that produce sizable effects in {delta}{gamma}{sub D} for realistic values of light quark masses, even if such NP contributions are undetectable in the current round of D{sup 0} decay experiments. This makes {delta}{gamma}{sub D} a viable observable for studies of indirect effects of New Physics.},
doi = {10.1103/PHYSREVLETT.98.181801},
journal = {Physical Review Letters},
number = 18,
volume = 98,
place = {United States},
year = {Fri May 04 00:00:00 EDT 2007},
month = {Fri May 04 00:00:00 EDT 2007}
}
  • A Comment on the Letter by Eugene Golowich, Sandip Pakvasa, and Alexey A. Petrov, Phys. Rev. Lett. 98, 181801 (2007)
  • The new physics contribution to the lifetime difference in D{sup 0}-D{sup 0} mixing is reexamined within the nonmanifest left-right symmetric model. Diagrams with one of {delta}C=1 transitions, mediated by a propagator with W{sub L}-W{sub R} mixing, are revisited. While these diagrams are believed to give the dominant contribution, compatible with the experimental data, it is shown that, due to Glashow-Iliopoulos-Miani (GIM) cancellation, such diagrams are negligible in sum. Thus, the left-right symmetric model contribution to the lifetime difference in D{sup 0}-D{sup 0} mixing is about 2 orders of magnitude less than actual experimental value for {delta}{gamma}{sub D}.
  • We reexamine constraints from the recent evidence for observation of the lifetime difference in D{sup 0}-D{sup 0} mixing on the parameters of supersymmetric models with R-parity violation (RPV). We find that RPV supersymmetry can give large negative contribution to the lifetime difference. We also discuss the importance of the choice of weak or mass basis when placing the constraints on RPV-violating couplings from flavor mixing experiments.
  • New physics at high energy scale often contributes to K{sup 0}-K{sup 0} and D{sup 0}-D{sup 0} mixings in an approximately SU(2){sub L} invariant way. In such a case, the combination of measurements in these two systems is particularly powerful. The resulting constraints can be expressed in terms of misalignments and flavor splittings.
  • We point out how, in certain models of new physics, the same combination of couplings occurs in the amplitudes for both D{sup 0}-D{sup 0} mixing and the rare decays D{sup 0}{yields}l{sup +}l{sup -}. If the new physics dominates and is responsible for the observed mixing, then a very simple correlation exists between the magnitudes of each; in fact the rates for the decay D{sup 0}{yields}l{sup +}l{sup -} are completely fixed by the mixing. Observation of D{sup 0}{yields}l{sup +}l{sup -} in excess of the standard model prediction could identify new physics contributions to D{sup 0}-D{sup 0} mixing.