Measurement of matter-antimatter differences in beauty baryon decays

The Lhcb Collaboration

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λb 0 baryons decaying to pπ- π+ π- and pπ-K+K- final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λb 0 to pπ- π+ π- decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector.

Original languageEnglish (US)
Pages (from-to)391-396
Number of pages6
JournalNature Physics
Volume13
Issue number4
DOIs
StatePublished - Apr 1 2017

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antimatter
baryons
CP violation
decay
conjugation
standard deviation
parity
sectors
mesons
asymmetry
physics
interactions

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Measurement of matter-antimatter differences in beauty baryon decays. / The Lhcb Collaboration.

In: Nature Physics, Vol. 13, No. 4, 01.04.2017, p. 391-396.

Research output: Contribution to journalArticle

The Lhcb Collaboration. / Measurement of matter-antimatter differences in beauty baryon decays. In: Nature Physics. 2017 ; Vol. 13, No. 4. pp. 391-396.
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abstract = "Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λb 0 baryons decaying to pπ- π+ π- and pπ-K+K- final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λb 0 to pπ- π+ π- decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector.",
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AU - Andreotti, M.

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AU - Appleby, R. B.

AU - Archilli, F.

AU - D'Argent, P.

AU - Arnau Romeu, J.

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AU - Back, J. J.

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AU - Barlow, R. J.

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AB - Differences in the behaviour of matter and antimatter have been observed in K and B meson decays, but not yet in any baryon decay. Such differences are associated with the non-invariance of fundamental interactions under the combined charge-conjugation and parity transformations, known as CP violation. Here, using data from the LHCb experiment at the Large Hadron Collider, we search for CP-violating asymmetries in the decay angle distributions of Λb 0 baryons decaying to pπ- π+ π- and pπ-K+K- final states. These four-body hadronic decays are a promising place to search for sources of CP violation both within and beyond the standard model of particle physics. We find evidence for CP violation in Λb 0 to pπ- π+ π- decays with a statistical significance corresponding to 3.3 standard deviations including systematic uncertainties. This represents the first evidence for CP violation in the baryon sector.

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