Implications of the CDF tt̄ forward-backward asymmetry for boosted top physics

Kfir Blum; Cedric Delaunay; Oram Gedalia; Yonit Hochberg; Seung J. Lee; Yosef Nir; Gilad Perez; Yotam Soreq

doi:10.1016/j.physletb.2011.07.020

Implications of the CDF tt̄ forward-backward asymmetry for boosted top physics

Kfir Blum, Cedric Delaunay, Oram Gedalia, Yonit Hochberg, Seung J. Lee, Yosef Nir, Gilad Perez, Yotam Soreq

Weizmann Institute of Science

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

Abstract

New physics at a high scale λ can affect top-related observables at O(1/λ2) via the interference of effective four quark operators with the SM amplitude. The (ūγμγ5Tau)(t̄γμγ5Tat) operator modifies the large Mtt̄ forward-backward asymmetry, and can account for the recent CDF measurement. The (ūγμTau)(t̄γμTat) operator modifies the differential cross section, but cannot enhance the cross section of ultra-massive boosted jets by more than 60%. The hint for a larger enhancement from a recent CDF measurement may not persist future experimental improvements, or may be a QCD effect that is not accounted for by leading order and matched Monte Carlo tools or naive factorization. If it comes from new physics, it may stem from new light states or an O(1/λ4) new physics effect.

Original language	English
Pages (from-to)	364-369
Number of pages	6
Journal	Physics Letters B
Volume	702
Issue number	5
DOIs	https://doi.org/10.1016/j.physletb.2011.07.020
State	Published - 26 Aug 2011

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2011.07.020

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title = "Implications of the CDF t{\=t} forward-backward asymmetry for boosted top physics",

abstract = "New physics at a high scale λ can affect top-related observables at O(1/λ2) via the interference of effective four quark operators with the SM amplitude. The (ūγμγ5Tau)({\=t}γμγ5Tat) operator modifies the large Mt{\=t} forward-backward asymmetry, and can account for the recent CDF measurement. The (ūγμTau)({\=t}γμTat) operator modifies the differential cross section, but cannot enhance the cross section of ultra-massive boosted jets by more than 60\%. The hint for a larger enhancement from a recent CDF measurement may not persist future experimental improvements, or may be a QCD effect that is not accounted for by leading order and matched Monte Carlo tools or naive factorization. If it comes from new physics, it may stem from new light states or an O(1/λ4) new physics effect.",

author = "Kfir Blum and Cedric Delaunay and Oram Gedalia and Yonit Hochberg and Lee, \{Seung J.\} and Yosef Nir and Gilad Perez and Yotam Soreq",

note = "Israel Science Foundation [377/07, 1087/09]; German-Israeli Foundation for scientific research and development (GIF); United States-Israel Binational Science Foundation (BSF); EU; IRG; Minerva; G.I.F.; German-Israeli Foundations; Peter \& Patricia Gruber AwardWe thank Raz Alon, Yochay Eshel, Alex Kagan, Fabrizio Margaroli, Pekka Sinervo and George Sterman for useful discussions. YN is the Amos de-Shalit chair of theoretical physics and supported by the Israel Science Foundation (grant \#377/07), the German-Israeli Foundation for scientific research and development (GIF), and the United States-Israel Binational Science Foundation (BSF). GP is the Shlomo and Michla Tomarin career development chair and is supported by the Israel Science Foundation (grant \#1087/09), EU-FP7 Marie Curie, IRG fellowship, Minerva and G.I.F., the German-Israeli Foundations, and the Peter \& Patricia Gruber Award.",

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AU - Blum, Kfir

AU - Delaunay, Cedric

AU - Gedalia, Oram

AU - Hochberg, Yonit

AU - Lee, Seung J.

AU - Nir, Yosef

AU - Perez, Gilad

AU - Soreq, Yotam

N1 - Israel Science Foundation [377/07, 1087/09]; German-Israeli Foundation for scientific research and development (GIF); United States-Israel Binational Science Foundation (BSF); EU; IRG; Minerva; G.I.F.; German-Israeli Foundations; Peter & Patricia Gruber AwardWe thank Raz Alon, Yochay Eshel, Alex Kagan, Fabrizio Margaroli, Pekka Sinervo and George Sterman for useful discussions. YN is the Amos de-Shalit chair of theoretical physics and supported by the Israel Science Foundation (grant #377/07), the German-Israeli Foundation for scientific research and development (GIF), and the United States-Israel Binational Science Foundation (BSF). GP is the Shlomo and Michla Tomarin career development chair and is supported by the Israel Science Foundation (grant #1087/09), EU-FP7 Marie Curie, IRG fellowship, Minerva and G.I.F., the German-Israeli Foundations, and the Peter & Patricia Gruber Award.

PY - 2011/8/26

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N2 - New physics at a high scale λ can affect top-related observables at O(1/λ2) via the interference of effective four quark operators with the SM amplitude. The (ūγμγ5Tau)(t̄γμγ5Tat) operator modifies the large Mtt̄ forward-backward asymmetry, and can account for the recent CDF measurement. The (ūγμTau)(t̄γμTat) operator modifies the differential cross section, but cannot enhance the cross section of ultra-massive boosted jets by more than 60%. The hint for a larger enhancement from a recent CDF measurement may not persist future experimental improvements, or may be a QCD effect that is not accounted for by leading order and matched Monte Carlo tools or naive factorization. If it comes from new physics, it may stem from new light states or an O(1/λ4) new physics effect.

AB - New physics at a high scale λ can affect top-related observables at O(1/λ2) via the interference of effective four quark operators with the SM amplitude. The (ūγμγ5Tau)(t̄γμγ5Tat) operator modifies the large Mtt̄ forward-backward asymmetry, and can account for the recent CDF measurement. The (ūγμTau)(t̄γμTat) operator modifies the differential cross section, but cannot enhance the cross section of ultra-massive boosted jets by more than 60%. The hint for a larger enhancement from a recent CDF measurement may not persist future experimental improvements, or may be a QCD effect that is not accounted for by leading order and matched Monte Carlo tools or naive factorization. If it comes from new physics, it may stem from new light states or an O(1/λ4) new physics effect.

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DO - 10.1016/j.physletb.2011.07.020

M3 - مقالة

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VL - 702

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EP - 369

JO - Physics Letters B

JF - Physics Letters B

IS - 5

ER -

Implications of the CDF tt̄ forward-backward asymmetry for boosted top physics

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