CP violation in single top quark production and decay via p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X within the MSSM: A possible application for measuring arg(A{sub t}) at hadron colliders

doi:https://doi.org/10.1103/PhysRevD.57.1495

Title: CP violation in single top quark production and decay via p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X within the MSSM: A possible application for measuring arg(A{sub t}) at hadron colliders

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Abstract

CP-nonconserving effects in the reaction p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X, driven by the supersymmetric CP-odd phase of the top squark trilinear soft breaking term arg(A{sub t}), are studied. We discuss the CP-nonconserving effects in both production and the associated decay amplitudes of the top quark. We find that, within a plausible low energy scenario of the MSSM and keeping the neutron electric dipole moment below its current limit, a CP-violating cross-section asymmetry as large as 2{minus}3{percent} can arise if some of the parameters lie in a favorable range. A partial rate asymmetry originating only in the top quark decay t{r_arrow}W{sup +}b is found to be, in general, below the 0.1{percent} level which is somewhat smaller than previous claims. For a low tan{beta} of order one the decay asymmetry can reach at the most {approximately}0.3{percent}. This (few) percent level overall CP-violating signal in p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X might be within the reach of the future 2(4) TeV p{bar p} Fermilab Tevatron collider that may be able to produce {approximately}10000 ({approximately}30000) such t{bar b} events with an integrated luminosity of 30 fb{sup {minus}1}. In particular, it may be used to place an upper bound on arg(A{sub t}) if indeed arg({mu}){r_arrow}0, asmore »« less

Authors:

Bar-Shalom, S ^[1]; Atwood, D ^[2]; Soni, A ^[3]

Department of Physics, University of California at Riverside, Riverside, California 92521 (United States)
Theory Group, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606 (United States)
Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)

Publication Date:: 1998-02-01

OSTI Identifier:: 567113

Resource Type:: Journal Article

Journal Name:: Physical Review, D

Additional Journal Information:: Journal Volume: 57; Journal Issue: 3; Other Information: PBD: Feb 1998

Country of Publication:: United States

Language:: English

Subject:: 66 PHYSICS; CP INVARIANCE; T QUARKS; PARTICLE PRODUCTION; PROTON-ANTIPROTON INTERACTIONS; B QUARKS; W PLUS BOSONS; SUPERSYMMETRY; CROSS SECTIONS; DECAY AMPLITUDES; STANDARD MODEL

Citation Formats


                    Bar-Shalom, S, Atwood, D, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, and Soni, A. CP violation in single top quark production and decay via p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X within the MSSM: A possible application for measuring arg(A{sub t}) at hadron colliders.  United States: N. p., 1998. 
        Web.  doi:10.1103/PhysRevD.57.1495.

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                    Bar-Shalom, S, Atwood, D, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, & Soni, A. CP violation in single top quark production and decay via p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X within the MSSM: A possible application for measuring arg(A{sub t}) at hadron colliders.  United States.  https://doi.org/10.1103/PhysRevD.57.1495

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                    Bar-Shalom, S, Atwood, D, Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, and Soni, A. Sun .  
        "CP violation in single top quark production and decay via p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X within the MSSM: A possible application for measuring arg(A{sub t}) at hadron colliders".  United States.  https://doi.org/10.1103/PhysRevD.57.1495.

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@article{osti_567113,

  title        = {CP violation in single top quark production and decay via p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X within the MSSM: A possible application for measuring arg(A{sub t}) at hadron colliders},

  author       = {Bar-Shalom, S and Atwood, D and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 and Soni, A},

  abstractNote = {CP-nonconserving effects in the reaction p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X, driven by the supersymmetric CP-odd phase of the top squark trilinear soft breaking term arg(A{sub t}), are studied. We discuss the CP-nonconserving effects in both production and the associated decay amplitudes of the top quark. We find that, within a plausible low energy scenario of the MSSM and keeping the neutron electric dipole moment below its current limit, a CP-violating cross-section asymmetry as large as 2{minus}3{percent} can arise if some of the parameters lie in a favorable range. A partial rate asymmetry originating only in the top quark decay t{r_arrow}W{sup +}b is found to be, in general, below the 0.1{percent} level which is somewhat smaller than previous claims. For a low tan{beta} of order one the decay asymmetry can reach at the most {approximately}0.3{percent}. This (few) percent level overall CP-violating signal in p{bar p}{r_arrow}t{bar b}+X{r_arrow}W{sup +}b{bar b}+X might be within the reach of the future 2(4) TeV p{bar p} Fermilab Tevatron collider that may be able to produce {approximately}10000 ({approximately}30000) such t{bar b} events with an integrated luminosity of 30 fb{sup {minus}1}. In particular, it may be used to place an upper bound on arg(A{sub t}) if indeed arg({mu}){r_arrow}0, as implied from the present experimental limit on the neutron electric dipole moment. The partial rate asymmetry in the top quark decay ({approximately}few{times}10{sup {minus}3}) may also be within the reach of the CERN LHC with {approximately}10{sup 7} pairs of t{bar t} produced, provided detector systematics are sufficiently small. We also show that if the GUT scale universality of the soft breaking trilinear A terms is relaxed, then the phases associated with arg(A{sub u}) and arg(A{sub d}) can take values up to {approximately}few{times}10{sup {minus}1} even with squarks and gluino masses of several hundred GeV{close_quote}s without contradicting the experimental limit on the neutron electric dipole moment. {copyright} {ital 1997} {ital The American Physical Society}},

  doi          = {10.1103/PhysRevD.57.1495},

  url          = {https://www.osti.gov/biblio/567113},
  journal      = {Physical Review, D},
number       = 3,

  volume       = 57,

  place        = {United States},

  year         = {1998},

  month        = {2}

}

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