Baryogenesis and low energy CP violation Page: 1 of 10
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LBNL-44150
August 1999
Baryogenesis and Low Energy CP Violation
Mihir P. Worah
Department of Physics
University of California, Berkeley, California 94720
and
Theoretical Physics Group
Lawrence Berkeley National Laboratory
July 10, 2004
Abstract
CP violation is a crucial component in the creation of the mat-
ter - anti matter asymmetry of the universe. An important open
question is whether the CP violating phenomena observeable in
01 terrestrial experiments have any relation with those responsible for
baryogenesis. We discuss two mechanisms of baryogenesis where this
question can be meaningfully posed: "electroweak baryogenesis" and
"baryogenesis via leptogenesis". We show how these scenarios can
be constrained by existing and forthcoming experimental data. We
- - present a specific example of both these scenarios where the CP
violating phase in the Cabbibo Kobayashi Maskawa matrix is re-
lated in a calculable way to the CP violating phase responsible for
baryogenesis.
The world that we observe is manifestly baryon asymmetric. All the
stable matter we see is made up of baryons, with anti-baryons being cre-
ated only in high energy collisions (either in the laboratories or out in the
cosmos). There is evidence that this asymmetry persists even at much
larger scales. Matter and anti-matter galaxies within the same galactic
cluster would result in strong <y ray emission due to annihilations. The
absence of these confirms a baryon asymmetric region on the 20 Mpc scale
[1]. More recently, a bound on the scale of the observable universe has been
obtained by ruling out a contribution to the diffuse <y ray spectrum from
particle-antiparticle annihilation [2]. The observed nuclear abundances in
the stars, then allows us to estimate that the current baryon to photon
ratio, nB/nly = (4 - 7) x 10'. This corresponds to a baryon-antibaryon
asymmetry of 1 part in 10 in the early universe.1
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Worah, Mihir P. Baryogenesis and low energy CP violation, article, August 19, 1999; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc779464/m1/1/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.