First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

Standard

First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity. / BaBar Collaboration.

в: Physical Review Letters, Том 121, № 26, 261801, 26.12.2018.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

BibTeX

@article{15f2292b614446a8bf973e14b110c521,

title = "First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity",

abstract = "We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where h0 {π0,η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106BB pairs recorded by the BABAR detector and (772±11)×106BB pairs recorded by the Belle detector. The results of the measurement are 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 β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B0→D(∗)h0 decays. The quoted model uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e+e-→cc data sample. CP violation is observed in B0→D(∗)h0 decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.",

keywords = "CP-VIOLATION, BABAR DETECTOR, DECAY, TOOL",

author = "{BaBar Collaboration} 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 V. Babu 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 Blinov, {V. E.} and A. Bondar and Druzhinin, {V. P.} and S. Eidelman and D. Epifanov and A. Garmash and Golubev, {V. B.} and Kravchenko, {E. A.} and P. Krokovny and A. Kuzmin and D. Matvienko and Onuchin, {A. P.} and Serednyakov, {S. I.} and V. Shebalin and Skovpen, {Yu I.} and Solodov, {E. P.} and V. Vorobyev and V. Zhilich and V. Zhulanov",

note = "Publisher Copyright: {\textcopyright} 2018 authors. Published by the American Physical Society.",

year = "2018",

month = dec,

day = "26",

doi = "10.1103/PhysRevLett.121.261801",

language = "English",

volume = "121",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "26",

}

RIS

TY - JOUR

T1 - First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

AU - BaBar Collaboration

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 - Babu, V.

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 - Blinov, V. E.

AU - Bondar, A.

AU - Druzhinin, V. P.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Garmash, A.

AU - Golubev, V. B.

AU - Kravchenko, E. A.

AU - Krokovny, P.

AU - Kuzmin, A.

AU - Matvienko, D.

AU - Onuchin, A. P.

AU - Serednyakov, S. I.

AU - Shebalin, V.

AU - Skovpen, Yu I.

AU - Solodov, E. P.

AU - Vorobyev, V.

AU - Zhilich, V.

AU - Zhulanov, V.

PY - 2018/12/26

Y1 - 2018/12/26

N2 - We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where h0 {π0,η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106BB pairs recorded by the BABAR detector and (772±11)×106BB pairs recorded by the Belle detector. The results of the measurement are 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 β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B0→D(∗)h0 decays. The quoted model uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e+e-→cc data sample. CP violation is observed in B0→D(∗)h0 decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.

AB - We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→KS0π+π- decays, where h0 {π0,η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the (4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106BB pairs recorded by the BABAR detector and (772±11)×106BB pairs recorded by the Belle detector. The results of the measurement are 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 β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B0→D(∗)h0 decays. The quoted model uncertainties are due to the composition of the D0→KS0π+π- decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e+e-→cc data sample. CP violation is observed in B0→D(∗)h0 decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2-β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.

KW - CP-VIOLATION

KW - BABAR DETECTOR

KW - DECAY

KW - TOOL

UR - http://www.scopus.com/inward/record.url?scp=85059231523&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.121.261801

DO - 10.1103/PhysRevLett.121.261801

M3 - Article

C2 - 30636113

AN - SCOPUS:85059231523

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 26

M1 - 261801

ER -

ID: 17999535