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Öğe Observation of chi(cJ) -> lambda(lambda)over-bar(eta)(PHYSICAL REVIEW D, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Albrecht, M.; Aliberti, R.; Çetin, Serkant Ali; Kolcu, Onur BuğraBy analyzing (448.1 +/- 2.9) x 10(6) psi(3686) events collected with the BESIII detector operating at the BEPCII collider, the decays of chi(cJ) -> Lambda(Lambda) over bar (eta) (J = 0, 1, and 2) are observed for the first time with statistical significances of 13.9 sigma, 6.7 sigma, and 8.2 sigma, respectively. The product branching fractions of psi(3686) -> gamma chi(cJ) and chi(cJ) -> Lambda(Lambda) over bar (eta) are measured. Dividing by the world averages of the branching fractions of psi(3686) -> gamma chi(cJ), the branching fractions of chi(cJ) -> Lambda(Lambda) over bar (eta) decays are determined to be (2.31 +/- 0.30 +/- 0.21) x 10(-4), (5.86 +/- 1.38 +/- 0.68) x 10(-5), and (1.05 +/- 0.21 +/- 0.15) x 10(-4) for J = 0, 1 and 2, respectively, where the first uncertainties are statistical and the second systematic.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 Observation of the decay ?(3686) ? ? ?? ¯ + and measurement of its angular distribution(Springer link, 2022) Ablikim M.; Achasov M.N.; Adlarson P.; Albrecht M.; Aliberti R.; Amoroso A.; An M.R.; An Q.; Bai X.H.; Bai Y.; Bakina O.; Baldini Ferroli R.; Çetin, Serkant Ali; Kolcu, Onur BuğraUsing (448.1 ± 2.9) × 106?(3686) events collected with the BESIII detector at the BEPCII collider, the decay ?(3686) ?? ?? ¯ + is observed for the first time with a branching fraction of (2.82 ± 0.04stat.± 0.08syst.) × 10?4, and the angular parameter ??? is measured to be 0.96 ± 0.09stat.± 0.03syst.. [Figure not available: see fulltext.] © 2022, The Author(s).Öğe Measurement of the absolute branching fraction and decay asymmetry of ??n?(American Physical Society, 2022) Ablikim, M; Achasov, M. N.; Adlarson, Patrik; Albrecht, Malte; Amoroso A.; Çetin, Serkant Ali; Kolcu, Onur BuğraThe radiative hyperon decay ??n? is studied using (10087±44)×10^{6} J/? events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay ??n? is determined to be (0.832±0.038_{stat}±0.054_{syst})×10^{-3}, which is a factor of 2.1 lower and 5.6 standard deviations different than the previous measurement. By analyzing the joint angular distribution of the decay products, the first determination of the decay asymmetry ?_{?} is reported with a value of -0.16±0.10_{stat}±0.05_{syst}.Öğe Measurement of the branching fraction of the singly cabibbo-suppressed decay ?c+ ? ?k+(APS, 2022) Ablikim M.; Achasov M.N.; Baldini Ferroli R.; Balossino I.; Bertani M.; Kolcu, Onur Buğra; Çetin, Serkant AliWe report a branching fraction measurement of the singly Cabibbo-suppressed decay ?c+??K+ using a data sample collected with the BESIII detector at the BEPCII storage ring. The data span center-of-mass energies from 4.599 to 4.950 GeV and correspond to an integrated luminosity of 6.44 fb-1. The branching fraction of ?c+??K+ relative to that of the Cabibbo-favored decay ?c+???+ is measured to be R=B(?c+??K+)B(?c+???+)=(4.78±0.34±0.20)%. Combining with the world-average value of B(?c+???+), we obtain B(?c+??K+)=(6.21±0.44±0.26±0.34)×10-4. Here the first uncertainties are statistical, the second systematic, and the third comes from the uncertainty of the ?c+???+ branching fraction. This result, which is more precise than previous measurements, does not agree with theoretical predictions, and suggests that nonfactorizable contributions have been underestimated in current models. © 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 Improved measurement of the strong-phase difference delta(K pi )(D)in quantum-correlated D(D)over-bar decays( )(SPRINGER, 2022) Ablikim, M; Achasov, M. N; Adlarson, P.; Albrecht, Malte; Aliberti, R.; Çetin, Serkant Ali; Kolcu, Onur BuğraThe decay D -> K-pi(+) is studied in a sample of quantum-correlated D (D) over bar pairs, based on a data set corresponding to an integrated luminosity of 2.93 fb(-1) collected at the psi(3770) resonance by the BESIII experiment. The asym- metry between CP-odd and CP-even eigenstate decays into K-pi(+) is determined to be A(K pi) = 0.132 +/- 0.011 +/- 0.007, where the first uncertainty is statistical and the second is systematic. This measurement is an update of an earlier study exploiting additional tagging modes, including several decay modes involving a K-L(0) meson. The branching fractions of the K-L(0) modes are determined as input to the analysis in a manner that is independent of any strong phase uncertainty. Using the predominantly CP-even tag D -> pi(+)pi(-)pi(0) and the ensemble of CP-odd eigenstate tags, the observable A(K pi)(pi pi pi 0) is measured to be 0.130 +/- 0.012 +/- 0.008. The two asymmetries are sensitive to r(D)(K pi) delta(K)(pi)(D), where r(D)(K pi) and S-D(K pi) are the ratio of amplitudes and phase difference, respectively, between the doubly Cabibbo-suppressed and Cabibbofavoured decays. In addition, events containing D -> K-pi(+) tagged by D -> K-S,L(0) pi(+)pi(-) are studied in bins of phase space of the three-body decays. This analysis has sensitivity to both r(D)(K pi) cos delta(K)(pi)(D) and r(D)(K pi) sin delta(K)(pi)(D). A fit to A(K pi), A(K pi)(pi pi pi 0) and the phase-space distribution of the D -> K-S,L(0) pi(+)pi(-) tags yields delta(K)(pi)(D) = (187.6(-9.7-6.4)(+8.9+5.4))degrees , where external con- straints are applied for r(D)(K pi) and other relevant parameters. This is the most precise measurement of delta(K)(pi)(D) in quantumcorrelated D (D) over bar decays.Öğe Luminosities and energies of e(+)e(-) collision data taken between root s=4.61 gev and 4.95 gev at BESIII(IOP Publishing Ltd, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Çetin, Serkant Ali; Kolcu, Onur BuğraFrom December 2019 to June 2021, the BESIII experiment collected approximately 5.85 fb(-1) of data at center-of-mass energies between 4.61 and 4.95 GeV. This is the highest collision energy BEPCII has reached to date. The accumulated e(+)e(-) annihilation data samples are useful for studying charmonium(-like) states and charmed-hadron decays. By adopting a novel method of analyzing the production of Lambda(+)(c)(Lambda) over bar (-)(c)pairs in e(+)e(-) annihilation, the center-of-mass energies are measured with a precision of similar to 0.6 MeV. Integrated luminosities are measured with a precision of better than 1% by analyzing the events of large-angle Bhabha scattering. These measurements provide important inputs to analyses based on these data samples.Öğe Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV*(IOP Publishing Ltd, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.The integrated luminosities of data samples collected in the BESIII experiment in 2016-2017 at center-of-mass energies between 4.19 and 4.28 GeV are measured with a precision better than 1% by analyzing large-angle Bhabha scattering events. The integrated luminosities of old datasets collected in 2010-2014 are updated by considering corrections related to detector performance, offsetting the effect of newly discovered readout errors in the electromagnetic calorimeter, which can haphazardly occur.Öğe Observation of the Y(4230) and a new structure in e(+)e(-) -> K+ K- J/psi(IOP Publishing Ltd, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Çetin, Ali Serkant; Kolcu, Onur BuğraThe cross sections of e(+)e(-) -> K+K- J/psi at center-of-mass energies from 4.127 to 4.600 GeV are measured based on 15.6 fb(-1) data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in the line shape of the cross sections. The mass and width of the first structure are measured to be (4225.3 +/- 2.3 +/- 21.5) MeV and (72.9 +/- 6.1 +/- 30.8) MeV, respectively. They are consistent with those of the established Y(4230). The second structure is observed for the first time with a statistical significance greater than 8 sigma, denoted as Y(4500). Its mass and width are determined to be (4484.7 +/- 13.3 +/- 24.1) MeV and (111.1 +/- 30.1 +/- 15.2) MeV, respectively. The first presented uncertainties are statistical and the second ones are systematic. The product of the electronic partial width with the decay branching fraction Gamma(Y(4230) -> e(+)e(-))B(Y(4230) -> K+ K- J/psi) is reported.Öğe Measurements of the absolute branching fractions of hadronic D -meson decays involving kaons and pions(American Physical Society, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.By analyzing an electron-positron collision data sample corresponding to an integrated luminosity of 2.93 fb-1 taken at the center-of-mass energy of 3.773 GeV with the BESIII detector, we obtain for the first time the absolute branching fractions for seven D0 and D+ hadronic decay modes and search for the hadronic decay D0?KS0KS0?0 with much improved sensitivity. The results are B(D0?KS0?0?0?0)=(7.64±0.30±0.29)×10-3, B(D0?K-?+?0?0?0)=(9.54±0.30±0.31)×10-3, B(D0?KS0?+?-?0?0)=(12.66±0.45±0.43)×10-3, B(D+?KS0?+?0?0)=(29.04±0.62±0.87)×10-3, B(D+?KS0?+?+?-?0)=(15.28±0.57±0.60)×10-3, B(D+?KS0?+?0?0?0)=(5.54±0.44±0.32)×10-3, B(D+?K-?+?+?0?0)=(4.95±0.26±0.19)×10-3, and B(D0?KS0KS0?0)<1.45×10-4 at the 90% confidence level. Here, the first uncertainties are statistical, and the second ones are systematic. The newly studied decays greatly enrich the knowledge of the D?K???? and D?K????? hadronic decays and open a bridge to access more two-body hadronic D decays containing scalar, vector, axial, and tensor mesons in the charm sector. © 2022 authors. Published by the American Physical Society.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 the doubly Cabibbo-suppressed decays D+ -> K+ pi(0)pi(0) and D+ -> K+ pi(0)eta(SPRINGER, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Çetin, Serkant AliBy analyzing e(+)e(-) annihilation data corresponding to an integrated luminosity of 2.93 fb(-1) collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observations of the doubly Cabibbo-suppressed decays D+ -> K+ pi(0)pi(0) and D+ -> K+ pi(0)eta. The branching fractions of D+ -> K+ pi(0)pi(0) and D+ -> K+ pi(0)eta are measured to be (2.1 +/- 0.4(stat) +/- 0.1(syst)) x 10(-4) and (2.1 +/- 0.5(stat) +/- 0.1(syst)) x 10(-4) with statistical significances of 8.8 sigma and 5.5 sigma, respectively. In addition, we search for the subprocesses D+ -> K*(892)(+)pi(0) and D+-> K*(892)(+)eta with K*(892)(+) -> K+pi(0). The branching fraction of D+ -> K* (892)(+)pi(0) is determined to be (4.4(-1.5stat)(+1.8) +/- 0.2(syst)) x 10(-4), with a statistical significance of 3.2 sigma. No significant signal for D+ -> K* (892)(+)pi(0) is found and we set an upper limit on the branching fraction of this decay at the 90% confidence level to be 5.4 x 10(-4).Öğe Amplitude analysis and branching fraction measurement of the decay D-s(->)+ K+pi(+)pi(-)pi(0)(SPRINGER, 2022) Ablikim, M.; Achasov, M. N.; Adlarson, P.; Albrecht, M.; Aliberti, R.he singly Cabibbo-suppressed decay Ds -> K+pi(+)pi(-)pi(0) is observed by using a data set corresponding to an integrated luminosity of 6.32 fb(-1) recorded by the BESIII detector at the centre-of-mass energies between 4.178 and 4.226 GeV. The first amplitude analysis of Ds+-> K+pi(+)pi(-)pi(0) reveals the sub-structures in this decay and determines the fractions and relative phases of different intermediate processes. The dominant intermediate process is Ds+ -> K-*0 rho(+), with a fit fraction of (40.5 +/- 2.8(stat.) +/- 1.5(syst.))%. With the detection efficiency based on our amplitude analysis, the absolute branching fraction for Ds+-> K+pi(+)pi(-)pi(0) is measured to be (9.75 +/- 0.54(stat.)+/- 0.17(syst.)) x 10(-3).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 First observation of the direct production of the ?c1 in e+e- annihilation(American Physical Society, 2022) Ablikim, Medina N.; Achasov, M. N.; Adlarson, Patrik; Ahmed, Shakeel; Albrecht, MalteWe study the direct production of the JPC=1++ charmonium state ?c1(1P) in electron-positron annihilation by carrying out an energy scan around the mass of the ?c1(1P). The data were collected with the BESIII detector at the BEPCII collider. An interference pattern between the signal process e+e-??c1(1P)??J/????+?- and the background processes e+e-??ISRJ/???ISR?+?- and e+e-??ISR?+?- is observed by combining all the data samples. The ?c1(1P) signal is observed with a significance of 5.1?. This is the first observation of a C-even state directly produced in e+e- annihilation. The electronic width of the ?c1(1P) resonance is determined to be ?ee=(0.12-0.08+0.13) eV, which is of the same order of magnitude as theoretical calculations. © 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 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 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 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 Search for dark matter axions with CAST-CAAP(NATURE PORTFOLIO, 2022) Adair, C. M.; Altenmuller, K.; Anastassopoulos, V; Cuendis, S. Arguedas; Baier, J.The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 mu eV to 22.47 mu eV mass range. The detection concept follows the Sikivie haloscope principle, where Dark Matter axions convert into photons within a resonator immersed in a magnetic field. The CAST-CAPP resonator is an array of four individual rectangular cavities inserted in a strong dipole magnet, phase-matched to maximize the detection sensitivity. Here we report on the data acquired for 4124 h from 2019 to 2021. Each cavity is equipped with a fast frequency tuning mechanism of 10 MHz/ min between 4.774 GHz and 5.434 GHz. In the present work, we exclude axion-photon couplings for virialized galactic axions down to g(a gamma gamma) = 8 x 10(-14) GeV-1 at the 90% confidence level. The here implemented phase-matching technique also allows for future large-scale upgrades.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.
