Measurement of the CP-violating phase β in B0→J/ψπ+π- decays and limits on penguin effects

LHCb Collaboration

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17 Citations (Scopus)

Abstract

Time-dependent CP violation is measured in the B(---)0→J/ψπ+π- channel for each π+π- resonant final state using data collected with an integrated luminosity of 3.0 fb-1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6-6.3+2.8)°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, B(---)s0→J/ψϕ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs is limited to be within the interval [-1.05°, +1.18°] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.

Original languageEnglish (US)
Pages (from-to)38-49
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume742
DOIs
StatePublished - 2015

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CP violation
decay
confidence
broken symmetry
diagrams
luminosity
intervals
collisions
shift
detectors
symmetry

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

@article{aa11b22e8b664790ae1166b1f6a20869,
title = "Measurement of the CP-violating phase β in B0→J/ψπ+π- decays and limits on penguin effects",
abstract = "Time-dependent CP violation is measured in the B(---)0→J/ψπ+π- channel for each π+π- resonant final state using data collected with an integrated luminosity of 3.0 fb-1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6-6.3+2.8)°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, B(---)s0→J/ψϕ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs is limited to be within the interval [-1.05°, +1.18°] at 95{\%} confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.",
author = "{LHCb Collaboration} and R. Aaij and B. Adeva and M. Adinolfi and A. Affolder and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and P. AlvarezCartelle and Alves, {A. A.} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and J. Anderson and R. Andreassen and M. Andreotti and Andrews, {J. E.} and Appleby, {R. B.} and O. AquinesGutierrez and F. Archilli and A. Artamonov and Marina Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and Back, {J. J.} and A. Badalov and C. Baesso and W. Baldini and Barlow, {R. J.} and C. Barschel and S. Barsuk and W. Barter and V. Batozskaya and V. Battista and A. Bay and L. Beaucourt and J. Beddow and F. Bedeschi and I. Bediaga and S. Belogurov and Blusk, {Steven Roy} and Tomasz Skwarnicki and Sheldon Stone",
year = "2015",
doi = "10.1016/j.physletb.2015.01.008",
language = "English (US)",
volume = "742",
pages = "38--49",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier",

}

TY - JOUR

T1 - Measurement of the CP-violating phase β in B0→J/ψπ+π- decays and limits on penguin effects

AU - LHCb Collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Affolder, A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Ali, S.

AU - Alkhazov, G.

AU - AlvarezCartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Anderson, J.

AU - Andreassen, R.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - AquinesGutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, Marina

AU - Aslanides, E.

AU - Auriemma, G.

AU - Baalouch, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Badalov, A.

AU - Baesso, C.

AU - Baldini, W.

AU - Barlow, R. J.

AU - Barschel, C.

AU - Barsuk, S.

AU - Barter, W.

AU - Batozskaya, V.

AU - Battista, V.

AU - Bay, A.

AU - Beaucourt, L.

AU - Beddow, J.

AU - Bedeschi, F.

AU - Bediaga, I.

AU - Belogurov, S.

AU - Blusk, Steven Roy

AU - Skwarnicki, Tomasz

AU - Stone, Sheldon

PY - 2015

Y1 - 2015

N2 - Time-dependent CP violation is measured in the B(---)0→J/ψπ+π- channel for each π+π- resonant final state using data collected with an integrated luminosity of 3.0 fb-1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6-6.3+2.8)°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, B(---)s0→J/ψϕ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs is limited to be within the interval [-1.05°, +1.18°] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.

AB - Time-dependent CP violation is measured in the B(---)0→J/ψπ+π- channel for each π+π- resonant final state using data collected with an integrated luminosity of 3.0 fb-1 in pp collisions using the LHCb detector. The final state with the largest rate, J/ψρ0(770), is used to measure the CP-violating angle 2βeff to be (41.7±9.6-6.3+2.8)°. This result can be used to limit the size of penguin amplitude contributions to CP violation measurements in, for example, B(---)s0→J/ψϕ decays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase ϕs is limited to be within the interval [-1.05°, +1.18°] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.

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U2 - 10.1016/j.physletb.2015.01.008

DO - 10.1016/j.physletb.2015.01.008

M3 - Article

AN - SCOPUS:84937644627

VL - 742

SP - 38

EP - 49

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -