Measurement of $CP$ asymmetries and polarisation fractions in $B_s^0 → K^*0¯K^*0$ decays

R. Aaij; G. Raven

doi:10.1007/JHEP07(2015)166

Measurement of $CP$ asymmetries and polarisation fractions in $B_s^0 → K^0¯K^0$ decays

R. Aaij, G. Raven

(Astro)-Particles Physics

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

Abstract: An angular analysis of the decay B<inf>s</inf>⁰→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<inf>L</inf> = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K<inf>0</inf>^∗(1430) and K<inf>0</inf>^∗(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<inf>d</inf>/f<inf>s</inf>)) × 10⁻⁶.

Original language	English
Pages (from-to)	166
Journal	Journal of High Energy Physics
Volume	07
DOIs	https://doi.org/10.1007/JHEP07(2015)166
Publication status	Published - 2015

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Aaij:2015kba

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10.1007/JHEP07(2015)166

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Cite this

@article{e371cf8c2e414a3a95c613f2a611a1e0,

title = "Measurement of $CP$ asymmetries and polarisation fractions in $B_s^0 → K^*0¯K^*0$ 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.",

author = "R. Aaij and G. Raven",

note = "Aaij:2015kba",

year = "2015",

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

language = "English",

volume = "07",

pages = "166",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer Verlag",

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TY - JOUR

T1 - Measurement of $CP$ asymmetries and polarisation fractions in $B_s^0 → K^*0¯K^*0$ decays

AU - Aaij, R.

AU - Raven, G.

N1 - Aaij:2015kba

PY - 2015

Y1 - 2015

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.

U2 - 10.1007/JHEP07(2015)166

DO - 10.1007/JHEP07(2015)166

M3 - Article

SN - 1126-6708

VL - 07

SP - 166

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

ER -