Measurement of CP Violation in Stop Cascade Decays at the LHC

J. Ellis; F. Moortgat; G. Moortgat-Pick; J. M. Smillie; J. Tattersall

doi:10.1140/epjc/s10052-009-0964-8

Measurement of CP Violation in Stop Cascade Decays at the LHC

J. Ellis, F. Moortgat, G. Moortgat-Pick, J. M. Smillie, J. Tattersall

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, g g -> tilde{t}_i tilde{t}_i, tilde{t}_i -> t tilde{chi}^0_j, tilde{chi}^0_j -> tilde{\chi}^0_1 l^+ l^-, within the Minimal Supersymmetric Standard Model. We study T-odd asymmetries based on triple products between the different decay products. There may be a large CP asymmetry at the parton level, but there is a significant dilution at the hadronic level after integrating over the parton distribution functions. Consequently, even for scenarios where large CP intrinsic asymmetries are expected, the measurable asymmetry is rather small. High luminosity and precise measurements of masses, branching ratios and CP asymmetries may enable measurements of the CP-violating parameters in cascade decays at the LHC.

Original language	English
Journal	The European Physical Journal C
DOIs	https://doi.org/10.1140/epjc/s10052-009-0964-8
Publication status	Published - 9 Sept 2008

Access to Document

10.1140/epjc/s10052-009-0964-8

Cite this

@article{e1c3cdb2b9cc4bd095ad2915b96f1995,

title = "Measurement of CP Violation in Stop Cascade Decays at the LHC",

abstract = "We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, g g -> tilde{t}_i tilde{t}_i, tilde{t}_i -> t tilde{chi}^0_j, tilde{chi}^0_j -> tilde{\chi}^0_1 l^+ l^-, within the Minimal Supersymmetric Standard Model. We study T-odd asymmetries based on triple products between the different decay products. There may be a large CP asymmetry at the parton level, but there is a significant dilution at the hadronic level after integrating over the parton distribution functions. Consequently, even for scenarios where large CP intrinsic asymmetries are expected, the measurable asymmetry is rather small. High luminosity and precise measurements of masses, branching ratios and CP asymmetries may enable measurements of the CP-violating parameters in cascade decays at the LHC.",

author = "J. Ellis and F. Moortgat and G. Moortgat-Pick and {M. Smillie}, J. and J. Tattersall",

note = "Version accepted for publication in EPJC",

year = "2008",

month = sep,

day = "9",

doi = "10.1140/epjc/s10052-009-0964-8",

language = "English",

journal = "The European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

}

TY - JOUR

T1 - Measurement of CP Violation in Stop Cascade Decays at the LHC

AU - Ellis, J.

AU - Moortgat, F.

AU - Moortgat-Pick, G.

AU - M. Smillie, J.

AU - Tattersall, J.

N1 - Version accepted for publication in EPJC

PY - 2008/9/9

Y1 - 2008/9/9

N2 - We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, g g -> tilde{t}_i tilde{t}_i, tilde{t}_i -> t tilde{chi}^0_j, tilde{chi}^0_j -> tilde{\chi}^0_1 l^+ l^-, within the Minimal Supersymmetric Standard Model. We study T-odd asymmetries based on triple products between the different decay products. There may be a large CP asymmetry at the parton level, but there is a significant dilution at the hadronic level after integrating over the parton distribution functions. Consequently, even for scenarios where large CP intrinsic asymmetries are expected, the measurable asymmetry is rather small. High luminosity and precise measurements of masses, branching ratios and CP asymmetries may enable measurements of the CP-violating parameters in cascade decays at the LHC.

AB - We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, g g -> tilde{t}_i tilde{t}_i, tilde{t}_i -> t tilde{chi}^0_j, tilde{chi}^0_j -> tilde{\chi}^0_1 l^+ l^-, within the Minimal Supersymmetric Standard Model. We study T-odd asymmetries based on triple products between the different decay products. There may be a large CP asymmetry at the parton level, but there is a significant dilution at the hadronic level after integrating over the parton distribution functions. Consequently, even for scenarios where large CP intrinsic asymmetries are expected, the measurable asymmetry is rather small. High luminosity and precise measurements of masses, branching ratios and CP asymmetries may enable measurements of the CP-violating parameters in cascade decays at the LHC.

U2 - 10.1140/epjc/s10052-009-0964-8

DO - 10.1140/epjc/s10052-009-0964-8

M3 - Article

SN - 1434-6044

JO - The European Physical Journal C

JF - The European Physical Journal C

ER -

Measurement of CP Violation in Stop Cascade Decays at the LHC

Abstract

Access to Document

Fingerprint

Cite this