Evidence for an anomalous like-sign dimuon charge asymmetry

DØ Collaboration

Evidence for an anomalous like-sign dimuon charge asymmetry

DØ Collaboration

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Research output: Contribution to journal › Conference article › peer-review

Abstract

We measure the charge asymmetry A ≡ (N⁺⁺ − N⁻⁻)/(N⁺⁺ + N⁻⁻) of like-sign dimuon events in 6.1 fb⁻¹ of pp¯ collisions recorded with the D0 detector at a center-of-mass energy √s = 1.96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A^b _sl = −0.00957 ± 0.00251(stat) ± 0.00146 (sys). It differs by 3.2 standard deviations from the standard model prediction A^b _sl(SM) = (−2.3⁺ ₋ ⁰ ₀ ⁵ ₆) × 10⁻⁴, and provides the first evidence of anomalous CP violation in the mixing of neutral B mesons.

Original language	English
Journal	Proceedings of Science
Volume	120
State	Published - 2010
Event	35th International Conference of High Energy Physics, ICHEP 2010 - Paris, France Duration: 22 Jul 2010 → 28 Jul 2010

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@article{46f12ba72b944160a4fe9e0be406dd82,

title = "Evidence for an anomalous like-sign dimuon charge asymmetry",

abstract = "We measure the charge asymmetry A ≡ (N++ − N−−)/(N++ + N−−) of like-sign dimuon events in 6.1 fb−1 of pp¯ collisions recorded with the D0 detector at a center-of-mass energy √s = 1.96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: Ab sl = −0.00957 ± 0.00251(stat) ± 0.00146 (sys). It differs by 3.2 standard deviations from the standard model prediction Ab sl(SM) = (−2.3+ − 0 0 5 6) × 10−4, and provides the first evidence of anomalous CP violation in the mixing of neutral B mesons.",

author = "\{D{\O} Collaboration\} and Bruce Hoeneisen",

note = "Publisher Copyright: {\textcopyright} Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.; 35th International Conference of High Energy Physics, ICHEP 2010 ; Conference date: 22-07-2010 Through 28-07-2010",

year = "2010",

language = "Ingl{\'e}s",

volume = "120",

journal = "Proceedings of Science",

issn = "1824-8039",

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TY - JOUR

T1 - Evidence for an anomalous like-sign dimuon charge asymmetry

AU - DØ Collaboration

AU - Hoeneisen, Bruce

N1 - Publisher Copyright: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

PY - 2010

Y1 - 2010

N2 - We measure the charge asymmetry A ≡ (N++ − N−−)/(N++ + N−−) of like-sign dimuon events in 6.1 fb−1 of pp¯ collisions recorded with the D0 detector at a center-of-mass energy √s = 1.96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: Ab sl = −0.00957 ± 0.00251(stat) ± 0.00146 (sys). It differs by 3.2 standard deviations from the standard model prediction Ab sl(SM) = (−2.3+ − 0 0 5 6) × 10−4, and provides the first evidence of anomalous CP violation in the mixing of neutral B mesons.

AB - We measure the charge asymmetry A ≡ (N++ − N−−)/(N++ + N−−) of like-sign dimuon events in 6.1 fb−1 of pp¯ collisions recorded with the D0 detector at a center-of-mass energy √s = 1.96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: Ab sl = −0.00957 ± 0.00251(stat) ± 0.00146 (sys). It differs by 3.2 standard deviations from the standard model prediction Ab sl(SM) = (−2.3+ − 0 0 5 6) × 10−4, and provides the first evidence of anomalous CP violation in the mixing of neutral B mesons.

UR - https://www.scopus.com/pages/publications/85053768025

M3 - Artículo de la conferencia

AN - SCOPUS:85053768025

SN - 1824-8039

VL - 120

JO - Proceedings of Science

JF - Proceedings of Science

T2 - 35th International Conference of High Energy Physics, ICHEP 2010

Y2 - 22 July 2010 through 28 July 2010

ER -

Evidence for an anomalous like-sign dimuon charge asymmetry

Abstract

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