Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays

The Lhcb Collaboration

doi:10.1007/JHEP07(2015)166

Measurement of CP asymmetries and polarisation fractions in B_s⁰→K^∗0K^¯∗0 decays

The Lhcb Collaboration

Department of Physics

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

16 Scopus citations

Abstract

Abstract: An angular analysis of the decay B_s⁰→K^∗0K^¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb⁻¹ collected by the LHCb experiment at a centre-of-mass energy √s=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction f_L = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K₀^∗(1430) and K₀^∗(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction ℬBs→^K∗⁸⁹²⁰^K¯∗⁸⁹²⁰ is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f_d/f_s)) × 10⁻⁶.

Original language	English (US)
Article number	166
Journal	Journal of High Energy Physics
Volume	2015
Issue number	7
DOIs	https://doi.org/10.1007/JHEP07(2015)166
State	Published - Jul 6 2015

Keywords

B physics
CP violation
Flavour Changing Neutral Currents
Hadron-Hadron Scattering
Polarization

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1007/JHEP07(2015)166

Cite this

@article{15c422fb0a064e3e944e6d36cb057f97,

title = "Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays",

abstract = "Abstract: An angular analysis of the decay Bs0→K∗0K¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment at a centre-of-mass energy √s=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction fL = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K0∗(1430) and K0∗(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction ℬBs→K∗8920K¯∗8920 is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6.",

keywords = "B physics, CP violation, Flavour Changing Neutral Currents, Hadron-Hadron Scattering, Polarization",

author = "{The 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 {Alvarez Cartelle}, P. 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 {Aquines Gutierrez}, O. and F. Archilli and A. Artamonov and M. 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. Blusk and {Silva Coutinho}, R. and T. Skwarnicki and Sheldon Stone",

note = "Publisher Copyright: {\textcopyright} 2015, The Author(s).",

year = "2015",

month = jul,

day = "6",

doi = "10.1007/JHEP07(2015)166",

language = "English (US)",

volume = "2015",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer Verlag",

number = "7",

}

TY - JOUR

T1 - Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays

AU - The 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 - Alvarez Cartelle, 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 - Aquines Gutierrez, O.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

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 - Blusk, S.

AU - Silva Coutinho, R.

AU - Skwarnicki, T.

AU - Stone, Sheldon

PY - 2015/7/6

Y1 - 2015/7/6

N2 - Abstract: An angular analysis of the decay Bs0→K∗0K¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment at a centre-of-mass energy √s=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction fL = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K0∗(1430) and K0∗(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction ℬBs→K∗8920K¯∗8920 is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6.

AB - Abstract: An angular analysis of the decay Bs0→K∗0K¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment at a centre-of-mass energy √s=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction fL = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K0∗(1430) and K0∗(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction ℬBs→K∗8920K¯∗8920 is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6.

KW - B physics

KW - CP violation

KW - Flavour Changing Neutral Currents

KW - Hadron-Hadron Scattering

KW - Polarization

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U2 - 10.1007/JHEP07(2015)166

DO - 10.1007/JHEP07(2015)166

M3 - Article

AN - SCOPUS:84938590119

SN - 1126-6708

VL - 2015

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 7

M1 - 166

ER -