Measurement of the time-integrated CP asymmetry in D 0 → KS                         0 KS                         0 decays

The LHCb collaboration

doi:10.1007/JHEP11(2018)048

Measurement of the time-integrated CP asymmetry in D ⁰ → K_S ⁰ K_S ⁰ decays

The LHCb collaboration

Science Park 105
Universidade de Santiago de Compostela
University of Bristol
University of Michigan, Ann Arbor
Clermont-Auvergne University
University of Cincinnati
LNF-INFN
Fakultät Physik
University of Dortmund
European Organization for Nuclear Research
SUPA
University of Glasgow
University of Barcelona
Petersburg Nuclear Physics Institute (PNPI)
Imperial College London
Instituto de Biofisica da UFRJ
INFN
Laboratoire de l'Accélérateur Linéaire
Center for High Energy Physics
Tsinghua University
Istituto Nazionale di Fisica Nucleare, Sezione di Firenze
Institute of Physics
ENAC-IIC-GEL
Sezione INFN di Ferrara
University of Ferrara
University of Maryland, College Park
School of Physics and Astronomy
University of Manchester
University of Heidelberg
Aix Marseille Université
Kurchatov Institute
Syracuse University
Yandex School of Data Analysis
Physik-Institut
University of Zurich
Department of Physics
University of Warwick
National University of Science and Technology “MISIS”
National Centre for Nuclear Research (NCBJ)
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa

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

9 Citations (Scopus)

Abstract

A measurement of the time-integrated CP asymmetry in D⁰ → K_S ⁰K_S ⁰ decays is reported. The data correspond to an integrated luminosity of about 2 fb⁻¹ collected in 2015–2016 by the LHCb collaboration in pp collisions at a centre-of-mass energy of 13 TeV. The D⁰ candidate is required to originate from a D^*+ → D⁰π⁺ decay, allowing the determination of the flavour of the D⁰ meson using the pion charge. The D⁰ → K⁺K⁻ decay, which has a well measured CP asymmetry, is used as a calibration channel. The CP asymmetryfor D⁰ → K_S ⁰K_S ⁰ is measured to beACP(D0→KS0KS0)=(4.3±3.4±1.0)%,where the first uncertainty is statistical and the second is systematic. This result is combined with the previous LHCb measurement at lower centre-of-mass energies to obtainACP(D0→KS0KS0)=(2.3±2.8±0.9)%.[Figure not available: see fulltext.].

Original language	English
Article number	48
Journal	Journal of High Energy Physics
Volume	2018
Issue number	11
DOIs	https://doi.org/10.1007/JHEP11(2018)048
Publication status	Published - 1 Nov 2018

Keywords

CP violation
Charm physics
Flavor physics
Hadron-Hadron scattering (experiments)

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10.1007/JHEP11(2018)048

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@article{0ef289b8e36645939e1055c3d4a97e22,

title = "Measurement of the time-integrated CP asymmetry in D 0 → KS 0 KS 0 decays",

abstract = "A measurement of the time-integrated CP asymmetry in D0 → KS 0KS 0 decays is reported. The data correspond to an integrated luminosity of about 2 fb−1 collected in 2015{\textendash}2016 by the LHCb collaboration in pp collisions at a centre-of-mass energy of 13 TeV. The D0 candidate is required to originate from a D*+ → D0π+ decay, allowing the determination of the flavour of the D0 meson using the pion charge. The D0 → K+K− decay, which has a well measured CP asymmetry, is used as a calibration channel. The CP asymmetryfor D0 → KS 0KS 0 is measured to beACP(D0→KS0KS0)=(4.3±3.4±1.0)\%,where the first uncertainty is statistical and the second is systematic. This result is combined with the previous LHCb measurement at lower centre-of-mass energies to obtainACP(D0→KS0KS0)=(2.3±2.8±0.9)\%.[Figure not available: see fulltext.].",

keywords = "CP violation, Charm physics, Flavor physics, Hadron-Hadron scattering (experiments)",

author = "\{The LHCb collaboration\} and R. Aaij and B. Adeva and M. Adinolfi and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and \{Alfonso Albero\}, A. and S. Ali and G. Alkhazov and \{Alvarez Cartelle\}, P. and Alves, \{A. A.\} and S. Amato and S. Amerio and Y. Amhis and L. An and L. Anderlini and G. Andreassi and M. Andreotti and Andrews, \{J. E.\} and Appleby, \{R. B.\} and F. Archilli and P. d{\textquoteright}Argent and \{Arnau Romeu\}, J. and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and S. Bachmann and Back, \{J. J.\} and S. Baker and V. Balagura and W. Baldini and A. Baranov and Barlow, \{R. J.\} and S. Barsuk and W. Barter and F. Baryshnikov and V. Batozskaya and B. Batsukh and V. Battista and A. Bay and J. Beddow and F. Bedeschi and F. Fleuret and E. Maurice",

note = "Publisher Copyright: {\textcopyright} 2018, The Author(s).",

year = "2018",

month = nov,

day = "1",

doi = "10.1007/JHEP11(2018)048",

language = "English",

volume = "2018",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

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TY - JOUR

T1 - Measurement of the time-integrated CP asymmetry in D 0 → KS 0 KS 0 decays

AU - The LHCb collaboration

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Ali, S.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, A. A.

AU - Amato, S.

AU - Amerio, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreotti, M.

AU - Andrews, J. E.

AU - Appleby, R. B.

AU - Archilli, F.

AU - d’Argent, P.

AU - Arnau Romeu, J.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Bachmann, S.

AU - Back, J. J.

AU - Baker, S.

AU - Balagura, V.

AU - Baldini, W.

AU - Baranov, A.

AU - Barlow, R. J.

AU - Barsuk, S.

AU - Barter, W.

AU - Baryshnikov, F.

AU - Batozskaya, V.

AU - Batsukh, B.

AU - Battista, V.

AU - Bay, A.

AU - Beddow, J.

AU - Bedeschi, F.

AU - Fleuret, F.

AU - Maurice, E.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - A measurement of the time-integrated CP asymmetry in D0 → KS 0KS 0 decays is reported. The data correspond to an integrated luminosity of about 2 fb−1 collected in 2015–2016 by the LHCb collaboration in pp collisions at a centre-of-mass energy of 13 TeV. The D0 candidate is required to originate from a D*+ → D0π+ decay, allowing the determination of the flavour of the D0 meson using the pion charge. The D0 → K+K− decay, which has a well measured CP asymmetry, is used as a calibration channel. The CP asymmetryfor D0 → KS 0KS 0 is measured to beACP(D0→KS0KS0)=(4.3±3.4±1.0)%,where the first uncertainty is statistical and the second is systematic. This result is combined with the previous LHCb measurement at lower centre-of-mass energies to obtainACP(D0→KS0KS0)=(2.3±2.8±0.9)%.[Figure not available: see fulltext.].

AB - A measurement of the time-integrated CP asymmetry in D0 → KS 0KS 0 decays is reported. The data correspond to an integrated luminosity of about 2 fb−1 collected in 2015–2016 by the LHCb collaboration in pp collisions at a centre-of-mass energy of 13 TeV. The D0 candidate is required to originate from a D*+ → D0π+ decay, allowing the determination of the flavour of the D0 meson using the pion charge. The D0 → K+K− decay, which has a well measured CP asymmetry, is used as a calibration channel. The CP asymmetryfor D0 → KS 0KS 0 is measured to beACP(D0→KS0KS0)=(4.3±3.4±1.0)%,where the first uncertainty is statistical and the second is systematic. This result is combined with the previous LHCb measurement at lower centre-of-mass energies to obtainACP(D0→KS0KS0)=(2.3±2.8±0.9)%.[Figure not available: see fulltext.].

KW - CP violation

KW - Charm physics

KW - Flavor physics

KW - Hadron-Hadron scattering (experiments)

U2 - 10.1007/JHEP11(2018)048

DO - 10.1007/JHEP11(2018)048

M3 - Article

AN - SCOPUS:85056665770

SN - 1126-6708

VL - 2018

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 11

M1 - 48

ER -

Measurement of the time-integrated CP asymmetry in D 0 → KS 0 KS 0 decays

Abstract

Keywords

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Measurement of the time-integrated CP asymmetry in D ⁰ → K_S ⁰ K_S ⁰ decays