3,243 research outputs found

### CP Violation Beyond the Standard Model

I review CP-violating signals of physics beyond the standard model in the B
system. I examine the prospects for finding these effects at future colliders,
with an emphasis on hadron machines.Comment: 11 pages, plain latex, no figures. Talk given at the 9th
International Conference on B-Physics at Hadron Machines -- BEAUTY 2003,
Carnegie Mellon University, Pittsburgh, PA, USA, October 200

### CP Violation in the B System: Measuring New-Physics Parameters

I review CP violation in the standard model (SM). I also describe the
predictions for CP violation in the B system, along with signals for physics
beyond the SM. I stress the numerous contributions of Pat O'Donnell to this
subject. Finally, I discuss a new method for measuring new-physics parameters
in B decays. This knowledge will allow us to partially identify any new physics
which is found, before its direct production at high-energy colliders.Comment: 13 pages, 6 figures (included), plain latex. Talk given at MRST 2004:
From Quarks to Cosmology, Concordia University, Montreal, May 200

### New Physics and the Unitarity Triangle

After reviewing the present experimental constraints on the unitarity
triangle, I discuss the various ways in which new physics can manifest itself
in measurements of the parameters of the unitarity triangle. Apart from one
exception, which I describe, new physics enters principally through new
contributions to B0-B0(bar) mixing. Different models of new physics can be
partially distinguished by looking at their effects on rare, flavour-changing
$B$ penguin decays. (Invited talk given at the Symposium Twenty Beautiful Years
of Bottom Physics, Chicago, IL, USA, June 29 -- July 2, 1997.)Comment: 8 pages, Latex, requires aipproc.sty (included), 1 PS figure
(included

### Discrete Ambiguities in B-Decay CP Asymmetries and the Search for New Physics

The first measurements of CP violation in the B system will probably extract
$\sin 2\alpha$, $\sin 2\beta$ and $\cos 2\gamma$. Assuming that the CP angles
$\alpha$, $\beta$ and $\gamma$ are the interior angles of the unitarity
triangle, this determines the angle set $(\alpha,\beta,\gamma)$ up to a twofold
discrete ambiguity. The presence of this discrete ambiguity can make the
discovery of new physics difficult: if only one of the two solutions is
consistent with constraints from other measurements in the B and K systems, one
is not sure whether new physics is present or not. I present examples of this
situation, and discuss ways to resolve the discrete ambiguity.Comment: 7 pages, LaTeX, 1 figure, (requires WS-P8-50x6-00.CLS), to be
published in the Proceedings of PASCOS99, 7th International Symposium on
Particles, Strings and Cosmology, Lake Tahoe, California, Dec. 10-16, 199

### Measuring New-Physics Parameters in B Penguin Decays

We examine new-physics (NP) effects in B decays with large b -> s penguin
amplitudes. Decays involving b -> d penguins are assumed to be unaffected. We
consider a model-independent parametrization of such NP. We argue that NP
strong phases are negligible relative to those of the standard model. This
allows us to describe the NP effects in terms of a small number of effective
amplitudes A_NP^q (q=u,d,s,c) and corresponding weak phases Phi_q. We then
consider pairs of neutral B decays which are related by flavour SU(3) in the
standard model. One receives a large b -> s penguin component and has a NP
contribution; the other has a b -> d penguin amplitude and is unaffected by NP.
The time-dependent measurement of these two decays allows the {\it measurement}
of the NP parameters A_NP^q and Phi_q. The knowledge of these parameters allows
us to rule out many NP models and thus partially identify the new physics.Comment: 13 pages, latex, no figures. Paper rewritten in letter format.
Shortened considerably. Analysis and conclusions unchanged. To be published
in Physics Letters

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