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Öğe Absolute measurements of branching fractions of Cabibbo-suppressed hadronic D0(+) decays involving multiple pions(AMER PHYSICAL SOC, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, Riccardo; Çetin, Serkant Ali; Kolcu, Onur BuğraBy analyzing e(+)e(-) annihilation data with an integrated luminosity of 2.93 fb(-1) collected at the center-of-mass energy root s = 3.773 GeV with the BESIII detector, we present the first absolute measurements of the branching fractions of twenty Cabibbo-suppressed hadronic D0(+) decays involving multiple pions. The highest four branching fractions obtained are B(D-0 -> pi(+)pi(-)pi(0)) = (1.343 +/- 0.013(stat) +/- 0.016(syst))%, B(D-0 -> pi(+)pi(-)2 pi(0)) = (1.002 +/- 0.019(stat )+/- 0.024(syst))%, B(D-0 -> 2 pi(+)pi(-)pi(0))=(1.165 +/- 0.021(stat) +/- 0.021(sy)(st))%, and B(D+ -> 2 pi(+)pi(-)pi(0)). (1.074 +/- 0.040(stat) 0.030(syst))%. The CP asymmetries for the six decays with highest signal yields are also determined and found to be compatible with zero.Öğe Evidence for a neutral near-threshold structure in the K S0 recoil-mass spectra in e+e- ? K S0 Ds+ D?- and e+e- ? K S0 Ds?+ D-(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoWe study the processes e+e-?KS0Ds+D?- and e+e-?KS0Ds?+D-, as well as their charge conjugated processes, at five center-of-mass energies between 4.628 and 4.699 GeV, using data samples corresponding to an integrated luminosity of 3.8 fb-1 collected by the BESIII detector at the BEPCII storage ring. Based on a partial reconstruction technique, we find evidence of a structure near the thresholds for Ds+D?- and Ds?+D- production in the KS0 recoil-mass spectrum, which we refer to as the Zcs(3985)0. Fitting with a Breit-Wigner line shape, we find the mass of the structure to be (3992.2±1.7±1.6) MeV/c2 and the width to be (7.7-3.8+4.1±4.3) MeV, where the first uncertainties are statistical and the second are systematic. The significance of the Zcs(3985)0 signal is found to be 4.6? including both the statistical and systematic uncertainty. We report the Born cross section multiplied by the branching fraction at different energy points. The mass of the Zcs(3985)0 is close to that of the Zcs(3985)+. Assuming SU(3) symmetry, the cross section of the neutral channel is consistent with that of the charged one. Hence, we conclude that the Zcs(3985)0 is the isospin partner of the Zcs(3985)+.Öğe Measurement of branching fractions of singly cabibbo-suppressed decays ?c+ ? ?0K+ and ?+ KS0(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoBased on a sample of 4.5 fb-1 of e+e- annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays ?c+??0K+ and ?c+??+KS0 are studied. The ratio of the branching fraction B(?c+??0K+) relative to B(?c+??0?+) is measured to be 0.0361±0.0073(stat.)±0.0005(syst.), and the ratio of B(?c+??+KS0) relative to B(?c+??+?+?-) is measured to be 0.0106±0.0031(stat.)±0.0004(syst.). After taking the world-average branching fractions of the reference decay channels, the branching fractions B(?c+??0K+) and B(?c+??+KS0) are determined to be (4.7±0.9(stat.)±0.1(syst.)±0.3(ref.))×10-4 and (4.8±1.4(stat.)±0.2(syst.)±0.3(ref.))×10-4, respectively. The branching fraction of the ?c+??+KS0 decay is measured for the first time. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.Öğe Measurement of e+e- ??+?-D+D- cross sections at center-of-mass energies from 4.190 to 4.946 GeV(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoUsing data samples collected with the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the e+e-??+?-D+D- process at center-of-mass energies from 4.190 to 4.946 GeV with a partial reconstruction method. Resonance structures are seen and the cross section line shape can be described by the coherent sum of either two Breit-Wigner functions or a Breit-Wigner function and a phase space term. The mass and width of the resonance at about 4.4 GeV are determined to be (4371.6±2.5±9.2) MeV/c2 and (167±4±29) MeV, respectively, which are in agreement with those of the ?(4360) or Y(4390) state. The spin-3D-wave charmonium state X(3842) is searched for through the e+e-??+?-X(3842)??+?-D+D- process, and evidence with a significance of 4.2? is found in the data samples with center-of-mass energies from 4.6 to 4.7 GeV. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.Öğe Measurement of the absolute branching fraction of the singly cabibbo suppressed decay ?c+ ?p??(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoThe singly Cabibbo suppressed decay ?c+?p?? is measured using 4.5 fb-1 of e+e-collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. Evidence for ?c+?p?? with a statistical significance of 3.6? is reported with a double-Tag approach. The ?c+?p?? absolute branching fraction is determined to be (5.62-2.04+2.46±0.26)×10-4, where the first and second uncertainties are statistical and systematic, respectively. Our result is consistent with the branching fraction obtained by the Belle collaboration within the uncertainty of 1?.Öğe Observation of ?c (2S) ?3 (?+?-) and measurements of ?cJ ?3 (?+?-) in ? (3686) radiative transitions(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoThe hadronic decay ?c(2S)?3(?+?-) is observed with a statistical significance of 9.3 standard deviations using (448.1±2.9)×106 ?(3686) events collected by the BESIII detector at the BEPCII collider. The measured mass and width of ?c(2S) are (3643.4±2.3 (stat)±4.4 (syst)) MeV/c2 and (19.8±3.9 (stat)±3.1 (syst)) MeV, respectively, which are consistent with the world average values within two standard deviations. The product branching fraction B[?(3686)???c(2S)]×B[?c(2S)?3(?+?-)] is measured to be (9.2±1.0 (stat)±1.2 (syst))×10-6. Using B[?(3686)???c(2S)]=(7.0-2.5+3.4)×10-4, we obtain B[?c(2S)?3(?+?-)]=(1.31±0.15 (stat)±0.17 (syst) (+0.64-0.47) (extr))×10-2, where the third uncertainty is from B[?(3686)???c(2S)]. We also measure the ?cJ?3(?+?-) (J=0, 1, 2) decays via ?????cJ transitions. The branching fractions are B[?c0?3(?+?-)]=(2.080±0.006 (stat)±0.068 (syst))×10-2, B[?c1?3(?+?-)]=(1.092±0.004 (stat)±0.035 (syst))×10-2, and B[?c2?3(?+?-)]=(1.565±0.005 (stat)±0.048 (syst))×10-2. © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.Öğe Observation of resonance structures in e^{+}e^{-}??^{+}?^{-}?_{2}(3823) and mass measurement of ?_{2}(3823)(NLM (Medline), 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoUsing a data sample corresponding to an integrated luminosity of 11.3??fb^{-1} collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we measure the product of the e^{+}e^{-}??^{+}?^{-}?_{2}(3823) cross section and the branching fraction B[?_{2}(3823)???_{c1}]. For the first time, resonance structure is observed in the cross section line shape of e^{+}e^{-}??^{+}?^{-}?_{2}(3823) with significances exceeding 5?. A fit to data with two coherent Breit-Wigner resonances modeling the sqrt[s]-dependent cross section yields M(R_{1})=4406.9±17.2±4.5??MeV/c^{2}, ?(R_{1})=128.1±37.2±2.3??MeV, and M(R_{2})=4647.9±8.6±0.8??MeV/c^{2}, ?(R_{2})=33.1±18.6±4.1??MeV. Though weakly disfavored by the data, a single resonance with M(R)=4417.5±26.2±3.5??MeV/c^{2}, ?(R)=245±48±13??MeV is also possible to interpret data. This observation deepens our understanding of the nature of the vector charmoniumlike states. The mass of the ?_{2}(3823) state is measured as (3823.12±0.43±0.13)??MeV/c^{2}, which is the most precise measurement to date.Öğe Precise measurements of decay parameters and CP asymmetry with entangled ?- ? ¯ pairs(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Aliberti, RiccardoBased on 10 billion J/? events collected at the BESIII experiment, a search for CP violation in ? decay is performed in the difference between CP-odd decay parameters ?- for ??p?- and ?+ for ?¯?p¯?+ by using the process e+e-?J/????¯. With a five-dimensional fit to the full angular distributions of the daughter baryon, the most precise values for the decay parameters are determined to be ?-=0.7519±0.0036±0.0024 and ?+=-0.7559±0.0036±0.0030, respectively. The ? and ?¯ averaged value of the decay parameter is extracted to be ?avg=0.7542±0.0010±0.0024 with unprecedented accuracy. The CP asymmetry ACP=(?-+?+)/(? - ?+) is determined to be -0.0025±0.0046±0.0012, which is one of the most precise measurements in the baryon sector. The reported results for the decay parameter will play an important role in the studies of the polarizations and CP violations for the strange, charmed and beauty baryons. © 2022 authors. Published by the American Physical Society.Öğe Study of the h(c)(1(1)P(1)) meson via psi(2S) -> pi(0)h(c) decays at BESIII(AMER PHYSICAL SOC, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, Patrik; Aliberti, Riccardo; Çetin, Serkant Ali; Kolcu, Onur BuğraUsing 448 million psi(2S) events, the spin-singlet P-wave charmonium state h(c)(1(1)P(1)) is studied via the psi(2S) -> pi(0)h(c) decay followed by the h(c) -> gamma eta(c) transition. The branching fractions are measured to be B-Inc(psi(2S) -> pi(0)h(c)) x B-Tag (h(c) -> gamma eta(c)) = (4.22(-0.26)(+0.27) +/- 0.19) x 10(-4), B-Inc (psi(2S) -> pi(0)h(c)) = (7.32 +/- 0.34 +/- 0.41) x 10(-4) , and B-Tag (h(c) -> gamma eta(c)) = (57.66(-3.50)(+3.62) +/- 0.58)%, where the uncertainties are statistical and systematic, respectively. The h(c)(1(1)P(1)) mass and width are determined to be M = (3525.32 +/- 0.06 +/- 0.15) MeV/c(2) and Gamma = (0.78(-0.24)(+0.27)+/- 0.12) MeV. Using the center of gravity mass of the three chi(cJ) (1(3)P(J)) mesons [M(c.o.g.)], the 1P hyperfine mass splitting is estimated to be Delta(hyp) = M(h(c)) - M(c.o.g.) = (0.03 +/- 0.06 +/- 0.15) MeV/c(2), which is consistent with the expectation that the 1P hyperfine splitting is zero at the lowest order.
