Measurement of cos2β in B0 →d (∗)h0 with D → KS0 π+π- decays by a combined time-dependent Dalitz plot analysis of B a B ar and Belle data

(B a B ar Collaboration) A

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Abstract

We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB pairs collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e-→cc data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2-β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(∗)h0 decays. The measurement assumes no direct CP violation in B0→D(∗)h0 decays.

Original languageEnglish
Article number112012
JournalPhysical Review D
Volume98
Issue number11
DOIs
Publication statusPublished - 2018 Dec 1

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plots
decay
standard deviation
CP violation
industrial plants
triangles
ambiguity
apexes
mesons
statistics
energy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

@article{711bf5016766444eacdb61724e8250df,
title = "Measurement of cos2β in B0 →d (∗)h0 with D → KS0 π+π- decays by a combined time-dependent Dalitz plot analysis of B a B ar and Belle data",
abstract = "We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB pairs collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e-→cc data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2-β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(∗)h0 decays. The measurement assumes no direct CP violation in B0→D(∗)h0 decays.",
author = "{(B a B ar Collaboration) A} and I. Adachi and T. Adye and H. Ahmed and Ahn, {J. K.} and H. Aihara and S. Akar and Alam, {M. S.} and J. Albert and F. Anulli and N. Arnaud and Asner, {D. M.} and D. Aston and H. Atmacan and T. Aushev and R. Ayad and I. Badhrees and Bakich, {A. M.} and Sw Banerjee and V. Bansal and Barlow, {R. J.} and G. Batignani and A. Beaulieu and P. Behera and M. Bellis and E. Ben-Haim and D. Bernard and Bernlochner, {F. U.} and S. Bettarini and D. Bettoni and Bevan, {A. J.} and V. Bhardwaj and B. Bhuyan and F. Bianchi and M. Biasini and J. Biswal and Blinov, {V. E.} and M. Bomben and A. Bondar and Bonneaud, {G. R.} and A. Bozek and C. Bozzi and M. Bračko and Browder, {T. E.} and Brown, {D. N.} and Brown, {D. N.} and C. B{\"u}nger and Burchat, {P. R.} and Buzykaev, {A. R.} and R. Calabrese and A. Calcaterra",
year = "2018",
month = "12",
day = "1",
doi = "10.1103/PhysRevD.98.112012",
language = "English",
volume = "98",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "11",

}

Measurement of cos2β in B0 →d (∗)h0 with D → KS0 π+π- decays by a combined time-dependent Dalitz plot analysis of B a B ar and Belle data. / (B a B ar Collaboration) A.

In: Physical Review D, Vol. 98, No. 11, 112012, 01.12.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Measurement of cos2β in B0 →d (∗)h0 with D → KS0 π+π- decays by a combined time-dependent Dalitz plot analysis of B a B ar and Belle data

AU - (B a B ar Collaboration) A

AU - Adachi, I.

AU - Adye, T.

AU - Ahmed, H.

AU - Ahn, J. K.

AU - Aihara, H.

AU - Akar, S.

AU - Alam, M. S.

AU - Albert, J.

AU - Anulli, F.

AU - Arnaud, N.

AU - Asner, D. M.

AU - Aston, D.

AU - Atmacan, H.

AU - Aushev, T.

AU - Ayad, R.

AU - Badhrees, I.

AU - Bakich, A. M.

AU - Banerjee, Sw

AU - Bansal, V.

AU - Barlow, R. J.

AU - Batignani, G.

AU - Beaulieu, A.

AU - Behera, P.

AU - Bellis, M.

AU - Ben-Haim, E.

AU - Bernard, D.

AU - Bernlochner, F. U.

AU - Bettarini, S.

AU - Bettoni, D.

AU - Bevan, A. J.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bianchi, F.

AU - Biasini, M.

AU - Biswal, J.

AU - Blinov, V. E.

AU - Bomben, M.

AU - Bondar, A.

AU - Bonneaud, G. R.

AU - Bozek, A.

AU - Bozzi, C.

AU - Bračko, M.

AU - Browder, T. E.

AU - Brown, D. N.

AU - Brown, D. N.

AU - Bünger, C.

AU - Burchat, P. R.

AU - Buzykaev, A. R.

AU - Calabrese, R.

AU - Calcaterra, A.

PY - 2018/12/1

Y1 - 2018/12/1

N2 - We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB pairs collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e-→cc data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2-β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(∗)h0 decays. The measurement assumes no direct CP violation in B0→D(∗)h0 decays.

AB - We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB pairs collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e-→cc data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2-β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(∗)h0 decays. The measurement assumes no direct CP violation in B0→D(∗)h0 decays.

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U2 - 10.1103/PhysRevD.98.112012

DO - 10.1103/PhysRevD.98.112012

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VL - 98

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 11

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