Research output: Contribution to journal › Article › peer-review
First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity. / <i>B<span class="sc">a</span>B<span class="sc">ar</span></i> Collaboration.
In: Physical Review Letters, Vol. 121, No. 26, 261801, 26.12.2018.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity
AU - <i>B<span class="sc">a</span>B<span class="sc">ar</span></i> 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.
N1 - Publisher Copyright: © 2018 authors. Published by the American Physical Society.
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