Baryon asymmetry of the Universe in the standard model

Glennys R. Farrar, M. E. Shaposhnikov

    Research output: Contribution to journalArticle

    Abstract

    We study the interactions of quarks and antiquarks with the changing Higgs field during the electroweak phase transition, including quantum mechanical and some thermal effects, with the only source of CP violation being the known CKM phase. We show that the GIM cancellation, which has been commonly thought to imply a prediction which is at least 10 orders of magnitude too small, can be evaded in certain kinematic regimes, for instance, when the strange quark is totally reflected but the down quark is not. We report on a quantitative calculation of the asymmetry in a one-dimensional approximation based on the present understanding of the physics of the high-temperature environment, but with some aspects of the problem oversimplified. The resulting prediction for the magnitude and sign of the present baryonic asymmetry of the Universe agrees with the observed value, with moderately optimistic assumptions about the dynamics of the phase transition. Both magnitude and sign of the asymmetry have an intricate dependence on quark masses and mixings, so that quantitative agreement between prediction and observation would be highly nontrivial. At present uncertainties related to the dynamics of the EW phase transition and the oversimplifications of our treatment are too great to decide whether or not this is the correct explanation for the presence of remnant matter in our Universe; however, the present work makes it clear that the minimal standard model cannot be discounted as a contender for explaining this phenomenon.

    Original languageEnglish (US)
    Pages (from-to)774-818
    Number of pages45
    JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
    Volume50
    Issue number2
    DOIs
    StatePublished - 1994

    Fingerprint

    baryons
    universe
    asymmetry
    quarks
    predictions
    high temperature environments
    CP violation
    cancellation
    temperature effects
    kinematics
    physics
    approximation
    interactions

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Baryon asymmetry of the Universe in the standard model. / Farrar, Glennys R.; Shaposhnikov, M. E.

    In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 50, No. 2, 1994, p. 774-818.

    Research output: Contribution to journalArticle

    Farrar, Glennys R. ; Shaposhnikov, M. E. / Baryon asymmetry of the Universe in the standard model. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 1994 ; Vol. 50, No. 2. pp. 774-818.
    @article{e157525277bd459393604be31aed3f6f,
    title = "Baryon asymmetry of the Universe in the standard model",
    abstract = "We study the interactions of quarks and antiquarks with the changing Higgs field during the electroweak phase transition, including quantum mechanical and some thermal effects, with the only source of CP violation being the known CKM phase. We show that the GIM cancellation, which has been commonly thought to imply a prediction which is at least 10 orders of magnitude too small, can be evaded in certain kinematic regimes, for instance, when the strange quark is totally reflected but the down quark is not. We report on a quantitative calculation of the asymmetry in a one-dimensional approximation based on the present understanding of the physics of the high-temperature environment, but with some aspects of the problem oversimplified. The resulting prediction for the magnitude and sign of the present baryonic asymmetry of the Universe agrees with the observed value, with moderately optimistic assumptions about the dynamics of the phase transition. Both magnitude and sign of the asymmetry have an intricate dependence on quark masses and mixings, so that quantitative agreement between prediction and observation would be highly nontrivial. At present uncertainties related to the dynamics of the EW phase transition and the oversimplifications of our treatment are too great to decide whether or not this is the correct explanation for the presence of remnant matter in our Universe; however, the present work makes it clear that the minimal standard model cannot be discounted as a contender for explaining this phenomenon.",
    author = "Farrar, {Glennys R.} and Shaposhnikov, {M. E.}",
    year = "1994",
    doi = "10.1103/PhysRevD.50.774",
    language = "English (US)",
    volume = "50",
    pages = "774--818",
    journal = "Physical review D: Particles and fields",
    issn = "1550-7998",
    publisher = "American Institute of Physics",
    number = "2",

    }

    TY - JOUR

    T1 - Baryon asymmetry of the Universe in the standard model

    AU - Farrar, Glennys R.

    AU - Shaposhnikov, M. E.

    PY - 1994

    Y1 - 1994

    N2 - We study the interactions of quarks and antiquarks with the changing Higgs field during the electroweak phase transition, including quantum mechanical and some thermal effects, with the only source of CP violation being the known CKM phase. We show that the GIM cancellation, which has been commonly thought to imply a prediction which is at least 10 orders of magnitude too small, can be evaded in certain kinematic regimes, for instance, when the strange quark is totally reflected but the down quark is not. We report on a quantitative calculation of the asymmetry in a one-dimensional approximation based on the present understanding of the physics of the high-temperature environment, but with some aspects of the problem oversimplified. The resulting prediction for the magnitude and sign of the present baryonic asymmetry of the Universe agrees with the observed value, with moderately optimistic assumptions about the dynamics of the phase transition. Both magnitude and sign of the asymmetry have an intricate dependence on quark masses and mixings, so that quantitative agreement between prediction and observation would be highly nontrivial. At present uncertainties related to the dynamics of the EW phase transition and the oversimplifications of our treatment are too great to decide whether or not this is the correct explanation for the presence of remnant matter in our Universe; however, the present work makes it clear that the minimal standard model cannot be discounted as a contender for explaining this phenomenon.

    AB - We study the interactions of quarks and antiquarks with the changing Higgs field during the electroweak phase transition, including quantum mechanical and some thermal effects, with the only source of CP violation being the known CKM phase. We show that the GIM cancellation, which has been commonly thought to imply a prediction which is at least 10 orders of magnitude too small, can be evaded in certain kinematic regimes, for instance, when the strange quark is totally reflected but the down quark is not. We report on a quantitative calculation of the asymmetry in a one-dimensional approximation based on the present understanding of the physics of the high-temperature environment, but with some aspects of the problem oversimplified. The resulting prediction for the magnitude and sign of the present baryonic asymmetry of the Universe agrees with the observed value, with moderately optimistic assumptions about the dynamics of the phase transition. Both magnitude and sign of the asymmetry have an intricate dependence on quark masses and mixings, so that quantitative agreement between prediction and observation would be highly nontrivial. At present uncertainties related to the dynamics of the EW phase transition and the oversimplifications of our treatment are too great to decide whether or not this is the correct explanation for the presence of remnant matter in our Universe; however, the present work makes it clear that the minimal standard model cannot be discounted as a contender for explaining this phenomenon.

    UR - http://www.scopus.com/inward/record.url?scp=33750735579&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=33750735579&partnerID=8YFLogxK

    U2 - 10.1103/PhysRevD.50.774

    DO - 10.1103/PhysRevD.50.774

    M3 - Article

    AN - SCOPUS:33750735579

    VL - 50

    SP - 774

    EP - 818

    JO - Physical review D: Particles and fields

    JF - Physical review D: Particles and fields

    SN - 1550-7998

    IS - 2

    ER -