Author: "Ai XC" / Topic: particle and plasma physics - Searchworks@Jio Institute Digital Library Search Results

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1. Measurement of the absolute branching fraction of D+ → K̅0 e+νe via K̅0 → π0π0* *Supported by National Key Basic Research Program of China (2009CB825204, 2015CB856700), National Natural Science Foundation of China (NSFC) (10935007, 11125525, 11235011, 11305180, 11322544, 11335008, 11425524, 11475123), Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, CAS Center for Excellence in Particle Physics (CCEPP), Collaborative Innovation Center for Particles and Interactions (CICPI), Joint Large-Scale Scientific Facility Funds of NSFC and CAS (11179007, U1232201, U1332201, U1532101), CAS (KJCX2-YW-N29, KJCX2-YW-N45), 100 Talents Program of CAS, National 1000 Talents Program of China, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology, German Research Foundation DFG (Collaborative Research Center CRC-1044), Istituto Nazionale di Fisica Nucleare, Italy, Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) (530-4CDP03), Ministry of Development of Turkey (DPT2006K-120470),

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, S, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, RP, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, and Heng, YK
Subjects: charmed mesons, semileptonic decays, absolute branching fraction, BESIII/BEPCII, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: By analyzing 2.93 fb$^{-1}$ data collected at the center-of-mass energy$\sqrt s=3.773$ GeV with the BESIII detector, we measure the absolute branchingfraction of the semileptonic decay $D^+\rightarrow\bar K^0 e^{+}\nu_{e}$ to be${\mathcal B}(D^{+}\rightarrow\bar K^0 e^{+}\nu_{e})=(8.59 \pm 0.14 \pm0.21)\%$ using $\bar K^0\to K^0_S\to \pi^0\pi^0$, where the first uncertaintyis statistical and the second systematic. Our result is consistent withprevious measurements within uncertainties.
Published: 2016

2. Measurement of the absolute branching fraction of D-vertical bar -> (K)over-bar(0)e(vertical bar) nu(e) via (K)over-bar(0) -> pi(0)pi(0)

Author: Ablikim, M, Achasov, N, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettonin, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Caleaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, S, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, RP, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, and Heng, YK
Subjects: charmed mesons, semileptonic decays, absolute branching fraction, BESIII/BEPCII, hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: By analyzing 2.93 fb$^{-1}$ data collected at the center-of-mass energy$\sqrt s=3.773$ GeV with the BESIII detector, we measure the absolute branchingfraction of the semileptonic decay $D^+\rightarrow\bar K^0 e^{+}\nu_{e}$ to be${\mathcal B}(D^{+}\rightarrow\bar K^0 e^{+}\nu_{e})=(8.59 \pm 0.14 \pm0.21)\%$ using $\bar K^0\to K^0_S\to \pi^0\pi^0$, where the first uncertaintyis statistical and the second systematic. Our result is consistent withprevious measurements within uncertainties.
Published: 2016

3. Measurements of the center-of-mass energies at BESIII via the di-muon process* *Supported by National Key Basic Research Program of China (2015CB856700), National Natural Science Foundation of China (11125525, 11235011, 11322544, 11335008, 11425524, Y61137005C), Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, CAS Center for Excellence in Particle Physics (CCEPP), Collaborative Innovation Center for Particles and Interactions (CICPI), Joint Large-Scale Scientific Facility Funds of NSFC and CAS (11179007, U1232201, U1332201), CAS (KJCX2-YW-N29, KJCX2-YW-N45), 100 Talents Program of CAS, National 1000 Talents Program of China, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology, German Research Foundation DFG (Collaborative Research Center CRC-1044), Istituto Nazionale di Fisica Nucleare, Italy, Ministry of Development of Turkey (DPT2006K-120470), Russian Foundation for Basic Research (14-07-91152), Swedish Research Council, U. S. Department of Energy (DE-FG02-04ER412

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, and Hu, Y
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, center-of-mass energy, di-muon process, charmoniumlike states, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: From 2011 to 2014, the BESIII experiment collected about 5 fb-1 data at center-of-mass energies around 4 GeV for the studies of the charmonium-like and higher excited charmonium states. By analyzing the di-muon process e+e- → γISR/FSRμ+μ-, the center-of-mass energies of the data samples are measured with a precision of 0.8 MeV. The center-of-mass energy is found to be stable for most of the time during data taking.
Published: 2016

4. Study of ψ decays to the Ξ-Ξ¯+ and Σ(1385)∓Σ¯(1385)± final states

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We study the decays of the charmonium resonances J/ψ and ψ(3686) to the final states Ξ-Ξ+, Σ(1385) Σ(1385)± based on a single baryon tag method using data samples of (223.7±1.4)×106 J/ψ and (106.4±0.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decay ψ(3686)→Σ(1385) Σ(1385)± is observed for the first time, and the measurements of the other processes, including the branching fractions and angular distributions, are in good agreement with, and much more precise than, the previously published results. Additionally, the ratios B(ψ(3686)→Ξ-Ξ+)B(J/ψ→Ξ-Ξ+), B(ψ(3686)→Σ(1385)-Σ(1385)+)B(J/ψ→Σ(1385)-Σ(1385)+) and B(ψ(3686)→Σ(1385)+Σ(1385)-)B(J/ψ→Σ(1385)+Σ(1385)-) are determined.
Published: 2016

5. Search for the weak decay η′→K±π∓ and precise measurement of the branching fraction B(J/ψ→ϕη′)

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, He, XQ, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, and Hu, Y
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We present the first search for the rare decay of η′ into K±π in J/ψ→φη′, using a sample of 1.3×109 J/ψ events collected with the BESIII detector. No significant signal is observed, and the upper limit at the 90% confidence level for the ratio B(η′→K±π)B(η′→γπ+π-) is determined to be 1.3×10-4. In addition, we report the measurement of the branching fraction of J/ψ→φη′ to be [5.10±0.03(stat)±0.32(syst)]×10-4, which agrees with previous results from BESII.
Published: 2016

6. Study of J/ψ→pp¯ϕ at BESIII

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Sciences, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using a data sample of 1.31×109 J/ψ events accumulated with the BESIII detector, the decay J/ψ→ppφ is studied via two decay modes, φ→KS0KL0 and φ→K+K-. The branching fraction of J/ψ→pp φ is measured to be B(J/ψ→pp φ)=[5.23±0.06(stat)±0.33(syst)]×10-5, which agrees well with a previously published measurement, but with a significantly improved precision. No evident enhancement near the pp-mass threshold, denoted as X(pp ), is observed, and the upper limit on the branching fraction of J/ψ→X(pp )φ→pp φ is determined to be B(J/ψ→X(pp )φ→pp φ)
Published: 2016

7. Measurement of the branching fraction for psi(3770) -> gamma chi c0

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, E, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, Heng, YK, and Hou, ZL
Subjects: hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: By analyzing a data set of 2.92 fb$^{-1}$ of $e^+e^-$ collision data taken at$\sqrt s= 3.773~\rm GeV$ and 106.41$\times 10^{6}$ $\psi(3686)$ decays taken at$\sqrt s= 3.686~\rm GeV$ with the BESIII detector at the BEPCII collider, wemeasure the branching fraction and the partial decay width for$\psi(3770)\to\gamma\chi_{c0}$ to be ${\mathcalB}(\psi(3770)\to\gamma\chi_{c0})=(6.88\pm0.28\pm0.67)\times 10^{-3}$ and$\Gamma[\psi(3770)\to\gamma\chi_{c0}]=(187\pm8\pm19)~\rm keV$, respectively.These are the most precise measurements to date.
Published: 2016

8. Measurement of the e + e − → π + π − cross section between 600 and 900 MeV using initial state radiation

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, He, XQ, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, and Hu, JF
Subjects: Hadronic cross section, Muon anomaly, Initial state radiation, Pion form factor, BESIII, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: We extract the e+e-→π+π- cross section in the energy range between 600 and 900 MeV, exploiting the method of initial state radiation. A data set with an integrated luminosity of 2.93 fb-1 taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider is used. The cross section is measured with a systematic uncertainty of 0.9%. We extract the pion form factor |Fπ|2 as well as the contribution of the measured cross section to the leading-order hadronic vacuum polarization contribution to (g-2)μ. We find this value to be aμππ,LO(600-900MeV)=(368.2±2.5stat±3.3sys)10-10, which is between the corresponding values using the BaBar or KLOE data.
Published: 2016

9. Measurement of the branching fraction for ψ(3770)→γχc0

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, and Heng, YK
Subjects: hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: By analyzing a data set of 2.92 fb$^{-1}$ of $e^+e^-$ collision data taken at$\sqrt s= 3.773~\rm GeV$ and 106.41$\times 10^{6}$ $\psi(3686)$ decays taken at$\sqrt s= 3.686~\rm GeV$ with the BESIII detector at the BEPCII collider, wemeasure the branching fraction and the partial decay width for$\psi(3770)\to\gamma\chi_{c0}$ to be ${\mathcalB}(\psi(3770)\to\gamma\chi_{c0})=(6.88\pm0.28\pm0.67)\times 10^{-3}$ and$\Gamma[\psi(3770)\to\gamma\chi_{c0}]=(187\pm8\pm19)~\rm keV$, respectively.These are the most precise measurements to date.
Published: 2016

10. Observation of e+e-→ωχc1,2 near s=4.42 and 4.6 GeV

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Dou, ZL, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Farinelli, R, Fava, L, Fedorov, O, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, L, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, Heng, YK, and Hou, ZL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Based on data samples collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energies s>4.4 GeV, the processes e+e-→ωχc1,2 are observed for the first time. With an integrated luminosity of 1074 pb-1 near s=4.42 GeV, a significant ωχc2 signal is found, and the cross section is measured to be (20.9±3.2±2.5) pb. With 567 pb-1 near s=4.6 GeV, a clear ωχc1 signal is seen, and the cross section is measured to be (9.5±2.1±1.3) pb, while evidence is found for an ωχc2 signal. The first errors are statistical, and the second are systematic. Due to low luminosity or low cross section at other energies, no significant signals are observed. In the ωχc2 cross section, an enhancement is seen around s=4.42 GeV. Fitting the cross section with a coherent sum of the ψ(4415) Breit-Wigner function and a phase-space term, the branching fraction B(ψ(4415)→ωχc2) is obtained to be of the order of 10-3.
Published: 2016

11. Study of decay dynamics and CP asymmetry in D+→KL0e+νe decay

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, S, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, RP, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, and Hu, JF
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using 2.92 fb-1 of electron-positron annihilation data collected at s=3.773 GeV with the BESIII detector, we obtain the first measurements of the absolute branching fraction B(D+→KL0e+νe)=(4.481±0.027(stat)±0.103(sys))% and the CP asymmetry ACPD+→KL0e+νe=(-0.59±0.60(stat)±1.48(sys))%. From the D+→KL0e+νe differential decay rate distribution, the product of the hadronic form factor and the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, f+K(0)|Vcs|, is determined to be 0.728±0.006(stat)±0.011(sys). Using |Vcs| from the SM constrained fit with the measured f+K(0)|Vcs|, f+K(0)=0.748±0.007(stat)±0.012(sys) is obtained, and utilizing the unquenched Lattice QCD (LQCD) calculation for f+K(0), |Vcs|=0.975±0.008(stat)±0.015(sys)±0.025(LQCD).
Published: 2015

12. Measurement of the branching fractions of D-s(+) -> eta ' X and D-s(+) -> eta 'rho(+) in e(+)e(-) -> Ds+Ds-

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM
Subjects: BESIII, D-s, Branching fractions, Brain Disorders, Intellectual and Developmental Disabilities (IDD), Down Syndrome, hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Astronomical and Space Sciences, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: We study $D_{s}^{+}$ decays to final states involving the $\eta'$ with a482$\,$pb$^{-1}$ data sample collected at $\sqrt{s}$ = 4.009$\,$GeV with the\mbox{BESIII} detector at the BEPCII collider. We measure the branchingfractions $\mathcal{B}(D^+_{s}\rightarrow \eta'X)$ = (8.8$\pm$1.8$\pm$0.5)$\%$and $\mathcal{B}(D_{s}^{+}\rightarrow \eta'\rho^{+})$ = ($5.8\pm1.4\pm0.4$)$\%$where the first uncertainty is statistical and the second is systematic. Inaddition, we estimate an upper limit on the non-resonant branching ratio$\mathcal{B}(D_{s}^{+}\rightarrow \eta'\pi^+\pi^0)
Published: 2015

13. Confirmation of a charged charmoniumlike state Zc(3885)∓ in e+e-→π±(DD¯*)∓ with double D tag

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, S, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XL, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, RP, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, He, XQ, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We present a study of the process e+e-→π±(DD¯∗)∓ using data samples of 1092 pb-1 at s=4.23 GeV and 826 pb-1 at s=4.26 GeV collected with the BESIII detector at the BEPCII storage ring. With full reconstruction of the D meson pair and the bachelor π± in the final state, we confirm the existence of the charged structure Zc(3885)∓ in the (DD¯∗)∓ system in the two isospin processes e+e-→π+D0D∗- and e+e-→π+D-D∗0. By performing a simultaneous fit, the statistical significance of Zc(3885)∓ signal is determined to be greater than 10σ, and its pole mass and width are measured to be Mpole=(3881.7±1.6(stat)±1.6(syst)) MeV/c2 and Γpole=(26.6±2.0(stat)±2.1(syst)) MeV, respectively. The Born cross section times the (DD¯∗)∓ branching fraction (σ(e+e-→π±Zc(3885)∓)×Br(Zc(3885)∓→(DD¯∗)∓)) is measured to be (141.6±7.9(stat)±12.3(syst)) pb at s=4.23 GeV and (108.4±6.9(stat)±8.8(syst)) pb at s=4.26 GeV. The polar angular distribution of the π±-Zc(3885)∓ system is consistent with the expectation of a quantum number assignment of JP=1+ for Zc(3885)∓.
Published: 2015

14. Measurement of the branching fractions of Ds+→η′X and Ds+→η′ρ+ in e+e−→Ds+Ds−

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Brain Disorders, Down Syndrome, Intellectual and Developmental Disabilities (IDD), BESIII, D-s, Branching fractions, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: We study $D_{s}^{+}$ decays to final states involving the $\eta'$ with a482$\,$pb$^{-1}$ data sample collected at $\sqrt{s}$ = 4.009$\,$GeV with the\mbox{BESIII} detector at the BEPCII collider. We measure the branchingfractions $\mathcal{B}(D^+_{s}\rightarrow \eta'X)$ = (8.8$\pm$1.8$\pm$0.5)$\%$and $\mathcal{B}(D_{s}^{+}\rightarrow \eta'\rho^{+})$ = ($5.8\pm1.4\pm0.4$)$\%$where the first uncertainty is statistical and the second is systematic. Inaddition, we estimate an upper limit on the non-resonant branching ratio$\mathcal{B}(D_{s}^{+}\rightarrow \eta'\pi^+\pi^0)
Published: 2015

15. An improved limit for Γee of X(3872) and Γee measurement of ψ(3686)

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, and Hou, ZL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, X(3872), psi(3686), Gamma(ee), Charmonium spectroscopy, BESIII, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction e+e-→γISRX(3872)→γISRπ+π-J/ψ via the Initial State Radiation technique. The production of a resonance with quantum numbers JPC=1++ such as the X(3872) via single photon e+e- annihilation is forbidden, but is allowed by a next-to-leading order box diagram. We do not observe a significant signal of X(3872), and therefore give an upper limit for the electronic width times the branching fraction ΓeeX(3872)B(X(3872)→π+π-J/ψ)
Published: 2015

16. Study of dynamics of D0→K-e+νe and D0→π-e+νe decays

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, He, XQ, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, and Hu, T
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: In an analysis of a 2.92 fb-1 data sample taken at 3.773 GeV with the BESIII detector operated at the BEPCII collider, we measure the absolute decay branching fractions B(D0→K-e+νe)=(3.505±0.014±0.033)% and B(D0→π-e+νe)=(0.295±0.004±0.003)%. From a study of the differential decay rates we obtain the products of hadronic form factor and the magnitude of the Cabibbo-Kobayashi- Maskawa (CKM) matrix element f+K(0)|Vcs|=0.7172±0.0025±0.0035 and f+π(0)|Vcd|=0.1435±0.0018±0.0009. Combining these products with the values of |Vcs(d)| from the SM constraint fit, we extract the hadronic form factors f+K(0)=0.7368±0.0026±0.0036 and f+π(0)=0.6372±0.0080±0.0044, and their ratio f+π(0)/f+K(0)=0.8649±0.0112±0.0073. These form factors and their ratio are used to test unquenched lattice QCD calculations of the form factors and a light cone sum rule (LCSR) calculation of their ratio. The measured value of f+K(π)(0)|Vcs(d)| and the lattice QCD value for f+K(π)(0) are used to extract values of the CKM matrix elements of |Vcs|=0.9601±0.0033±0.0047±0.0239 and |Vcd|=0.2155±0.0027±0.0014±0.0094, where the third errors are due to the uncertainties in lattice QCD calculations of the form factors. Using the LCSR value for f+π(0)/f+K(0), we determine the ratio |Vcd|/|Vcs|=0.238±0.004±0.002±0.011, where the third error is from the uncertainty in the LCSR normalization. In addition, we measure form factor parameters for three different theoretical models that describe the weak hadronic charged currents for these two semileptonic decays. All of these measurements are the most precise to date.
Published: 2015

17. Precision measurement of the integrated luminosity of the data taken by BESIII at center-of-mass energies between 3.810 GeV and 4.600 GeV**Supported by National Key Basic Research Program of China (2015CB856700), National Natural Science Foundation of China (NSFC) (11125525, 11235011, 11322544, 11335008, 11425524), Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, Joint Large-Scale Scientific Facility Funds of the NSFC and CAS (11179007, U1232201, U1332201) CAS (KJCX2-YW-N29, KJCX2-YW-N45), 100 Talents Program of CAS, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology, German Research Foundation DFG (Collaborative Research Center CRC-1044), Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey (DPT2006K-120470), Russian Foundation for Basic Research (14-07-91152), U.S. Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118), U.S. National Science Foundation, University of Groningen (RuG) and the Helmholtz

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, precision measurement, luminosity, Bhabha scattering, charmonium, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: From December 2011 to May 2014, about 5 fb-1 of data were taken with the BESIII detector at center-of-mass energies between 3.810 GeV and 4.600 GeV to study the charmonium-like states and higher excited charmonium states. The time-integrated luminosity of the collected data sample is measured to a precision of 1% by analyzing events produced by the large-angle Bhabha scattering process.
Published: 2015

18. Observation of η′→ωe+e-

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Hao, XQ, Harris, FA, He, KL, He, XQ, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, and Hu, T
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: © 2015 American Physical Society. Based on a sample of η′ mesons produced in the radiative decay J/ψ→γη′ in 1.31×109J/ψ events collected with the BESIII detector, the decay η′→ωe+e- is observed for the first time, with a statistical significance of 8σ. The branching fraction is measured to be B(η′→ωe+e-)=(1.97±0.34(stat)±0.17(syst))×10-4, which is in agreement with theoretical predictions. The branching fraction of η′→ωγ is also measured to be (2.55±0.03(stat)±0.16(syst))×10-2, which is the most precise measurement to date, and the relative branching fraction B(η′→ωe+e-)B(η′→ωγ) is determined to be (7.71±1.34(stat)±0.54(syst))×10-3.
Published: 2015

19. Search for the isospin violating decay Y(4260)→J/ψηπ0

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Synchrotrons and Accelerators, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using data samples collected at center-of-mass energies of √s= 4.009, 4.226, 4.257, 4.358, 4.416, and 4.599 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the isospin violating decay Y(4260) → J/ψηπ0. No signal is observed, and upper limits on the cross section σ(e+e− → J/ψηπ0) at the 90% confidence level are determined to be 3.6, 1.7, 2.4, 1.4, 0.9, and 1.9 pb, respectively.
Published: 2015

20. Observation of the Dalitz decay η′→γe+e-

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We report the first observation of the Dalitz decay η’→γe+e−, based on a data sample of 1.31 billion J/ψ events collected with the BESIII detector. The η’ mesons are produced via the J/ψ→γη’ decay process. The ratio Γ(η’→γe+e−)/Γ(η’→γγ) is measured to be (2.13±0.09(stat)±0.07(sys))×10−2. This corresponds to a branching fraction B(η’→γe+e−)=(4.69±0.20(stat)±0.23(sys))×10−4. The transition form factor is extracted and different expressions are compared to the measured dependence on the e+e− invariant mass. The results are consistent with the prediction of the vector meson dominance model.
Published: 2015

21. Observation of the isospin-violating decay J/ψ→ϕπ0f0(980)

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, the decays J/ψ→φπ+π-π0 and J/ψ→φπ0π0π0 are investigated. The isospin-violating decay J/ψ→φπ0f0(980) with f0(980)→ππ is observed for the first time. The width of the f0(980) obtained from the dipion mass spectrum is found to be much smaller than the world average value. In the π0f0(980) mass spectrum, there is evidence of f1(1285) production. By studying the decay J/ψ→φη′, the branching fractions of η′→π+π-π0 and η′→π0π0π0, as well as their ratio, are also measured.
Published: 2015

22. Measurement of the matrix elements for the decays η→π+π-π0 and η/η′→π0π0π0

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Eren, EE, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 η→π+π-π0 events, 33,908 η→π0π0π0 events, and 1,888 η′→π0π0π0 events are performed. The measured matrix elements of η→π+π-π0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of η→π0π0π0 and η′→π0π0π0 are determined to be -0.055±0.014±0.004 and -0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays.
Published: 2015

23. Searches for isospin-violating transitions χc0,2→π0ηc

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We present the first upper-limit measurement of the branching fractions of the isospin-violating transitions χc0,2 → π0ηc. The measurements are performed using 106×106ψ(3686) events accumulated with the BESIII detector at the BEPCII e+e- collider at a center-of-mass energy corresponding to the ψ(3686) mass. We obtained upper limits on the branching fractions at a 90% confidence level of B(χc0→ π0ηc)
Published: 2015

24. Observation of the electromagnetic doubly OZI-suppressed decay J/ψ→ϕπ0

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using a sample of 1.31 billion J/ψ events accumulated with the BESIII detector at the BEPCII collider, we report the observation of the decay J/ψ→φπ0, which is the first evidence for a doubly Okubo-Zweig-Iizuka suppressed electromagnetic J/ψ decay. A clear structure is observed in the K+K- mass spectrum around 1.02 GeV/c2, which can be attributed to interference between J/ψ→φπ0 and J/ψ→K+K-π0 decays. Due to this interference, two possible solutions are found. The corresponding measured values of the branching fraction of J/ψ→φπ0 are [2.94±0.16(stat)±0.16(syst)]×10-6 and [1.24±0.33(stat)±0.30(syst)]×10-7.
Published: 2015

25. Search for D0→γγ and improved measurement of the branching fraction for D0→π0π0

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using 2.92 fb-1 of electron-positron annihilation data collected at √s = 3.773 GeV with the BESIII detector, we report the results of a search for the flavor-changing neutral current process D0 →γγ using a double-tag technique. We find no signal and set an upper limit at 90% confidence level for the branching fraction of B(D0 →γγ)< 3.8 × 10-6. We also investigate D0-meson decay into two neutral pions, obtaining a branching fraction of B(D0 →π0π0)= (8.24 ± 0.21(stat) ± 0.30(syst)) × 10-4, the most precise measurement to date and consistent with the current world average.
Published: 2015

26. Measurements of ψ(3686)→K-ΛΞ¯++c.c. and ψ(3686)→γK-ΛΞ¯++c.c.

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Sciences, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using a sample of 1.06×108ψ(3686) events produced in e+e- collisions at s=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays ψ(3686)→K-ΛΞ¯++c.c. and ψ(3686)→γK-ΛΞ¯++c.c.. We observe two hyperons, Ξ(1690)- and Ξ(1820)-, in the K-Λ invariant mass distribution in the decay ψ(3686)→K-ΛΞ¯++c.c. with significances of 4.9σ and 6.2σ, respectively. The branching fractions of ψ(3686)→K-ΛΞ¯++c.c., ψ(3686)→K-Σ0Ξ¯++c.c., ψ(3686)→γχcJ→γK-ΛΞ¯++c.c. (J=0, 1, 2), and ψ(3686)→Ξ(1690/1820)-Ξ¯++c.c. with subsequent decay Ξ(1690/1820)-→K-Λ are measured for the first time.
Published: 2015

27. Measurement of yCP in D0–D¯0 oscillation using quantum correlations in e+e−→D0D¯0 at s=3.773 GeV

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, and Hu, HM
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, BESIII, D-0-(D)over-bar(0) oscillation, y(CP), Quantum correlation, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: We report a measurement of the parameter yCP in D0-D-0 oscillations performed by taking advantage of quantum coherence between pairs of D0D-0 mesons produced in e+e- annihilations near threshold. In this work, doubly-tagged D0D-0 events, where one D decays to a CP eigenstate and the other D decays in a semileptonic mode, are reconstructed using a data sample of 2.92 fb-1 collected with the BESIII detector at the center-of-mass energy of s=3.773 GeV. We obtain yCP=(-2.0±1.3±0.7)%, where the first uncertainty is statistical and the second is systematic. This result is compatible with the current world average.
Published: 2015

28. Measurement of B(ψ(3770)→γχc1) and search for ψ(3770)→γχc2

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, XY, Gao, Y, Gao, Z, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Hao, XQ, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, and Hu, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We report a measurement of the branching fraction for ψ(3770)→γχc1 and search for the transition ψ(3770)→γχc2 based on 2.92 fb-1 of e+e- data accumulated at s=3.773 GeV with the BESIII detector at the BEPCII collider. We measure B(ψ(3770)→γχc1)=(2.48±0.15±0.23)×10-3, which is the most precise measurement to date. The upper limit on the branching fraction of ψ(3770)→γχc2 at a 90% confidence level is B(ψ(3770)→γχc2)
Published: 2015

29. Evidence for e+e− →γχc1,2 at center-of-mass energies from 4.009 to 4.360 GeV**Supported by National Key Basic Research Program of China (2015CB856700), Joint Funds of National Natural Science Foundation of China (11079008, 11179007, U1232201, U1332201, U1232107), National Natural Science Foundation of China (NSFC) (10935007, 11121092, 11125525, 11235011, 11322544, 11335008), Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program, CAS (KJCX2-YW-N29, KJCX2-YW-N45), 100 Talents Program of CAS, INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG (Collaborative Research Center CRC-1044), Istituto Nazionale di Fisica Nucleare, Italy, Ministry of Development of Turkey (DPT2006K-120470), Russian Foundation for Basic Research (14-07-91152), U. S. Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118), U.S. National Science Foundation, University of Groningen (RuG) and Helmholtzzentrum fuer Schwerionenforschung Gmb

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dbeyssi, A, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fritsch, M, Fu, CD, Gao, Q, Gao, Y, Gao, Z, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, and Hu, JF
Subjects: Nuclear and Plasma Physics, Physical Sciences, heavy quarkonia, decays of hadronic, electron-positron collisions, hadron production by, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Using data samples collected at center-of-mass energies of s = 4.009, 4.230, 4.260, and 4.360 GeV with the BESIII detector operating at the BEPCII collider, we perform a search for the process e+e- → γχcJ (J=0, 1, 2) and find evidence for e+e- → γχc1 and e+e- → γχc2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σB(e+e- → γχcJ), as well as their upper limits at the 90% confidence level (C.L.) are determined at each center-of-mass energy.
Published: 2015

30. Search for the weak decays J/ψ→Ds(*)−e+νe+c.c.

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, HY, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Duan, PF, Fan, JZ, Fang, J, Fang, SS, Fang, X, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fu, CD, Gao, Q, Gao, Y, Garzia, I, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, Y, Guo, YP, Haddadi, Z, Hafner, A, Han, S, Han, YL, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, and Hu, Y
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Brain Disorders, Intellectual and Developmental Disabilities (IDD), Down Syndrome, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using a sample of 2.25 × 108 J/ψ events collected with the BESIII detector at the BEPCII collider, we search for the J/ψ semileptonic weak decay J/ψ → D-s e+νe+ c.c. with a much higher sensitivity than previous searches. We also perform the first search for J/ψ → D∗-s e+νe + c.c. No significant excess of a signal above background is observed in either channel. At the 90% confidence level, the upper limits are determined to be B(J/ψ → D-s e+νe + c.c. )< 1.3 × 10-6 and B(J=ψ → D∗-s e+νe + c.c. ) < 1.8 × 10-6, respectively. Both are consistent with Standard Model predictions.
Published: 2014

31. Search for C-parity violation in J/ψ→γγ and γϕ

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, Amoroso, A, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feldbauer, F, Felici, G, Feng, CQ, Fioravanti, E, Fu, CD, Gao, Q, Gao, Y, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Haddadi, Z, Han, S, Han, YL, Harris, FA, He, KL, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, and Huang, JS
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using 1.06 × 108ψ (3686) events recorded in e+e-, collisions at √s = 3.686 GeV with the BESIII at the BEPCII collider, we present searches for C-parity violation in J/ψ → γγ and γφ decays via ψ(3686) → J/ψπ+π-. No significant signals are observed in either channel. Upper limits on the branching fractions are set to be B(J/ψ → γγ) < 2.7 × 10-7, and B(J/ψ → γφ>) < 1.4 × 10-6, at the 90% confidence level. The former is one order of magnitude more stringent than the previous upper limit, and the latter represents the first limit on this decay channel.
Published: 2014

32. Observation of J/ψ→pp¯a0(980) at BESIII

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bettoni, D, Bian, JM, Bianchi, F, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cibinetto, G, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, De Mori, F, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Felici, G, Feng, CQ, Fioravanti, E, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Garzia, I, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, LB, Guo, T, Guo, YP, Haddadi, Z, Han, S, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, and Huang, L
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Digestive Diseases, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using 2.25 × 108, J/ψ events collected with the BESIII detector at the BEPCII storage rings, we observe for the first time the process J/ψ → pp¯a0(980), a0(980) → π0η with a significance of 6.5σ (3.2σ including systematic uncertainties). The product branching fraction of J/ψ → pp¯a0 (980) → pp¯ π0η is measured to be (6.8 ± 1.2 ± 1.3) × 10-5, where the first error is statistical and the second is systematic. This measurement provides information on the a0 production near threshold coupling to pp and improves the understanding of the dynamics of J/ψ decays to four-body processes.
Published: 2014

33. Study of e+e-→pp¯π0 in the vicinity of the ψ(3770)

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: The process e+e−→ pp̄π0has been studied by analyzing data collected at (formula presented) GeV, at (formula presented) GeV, and during a ψ(3770) line shape scan with the BESIII detector at the BEPCII collider. The Born cross section of p̄pπ0in the vicinity of the ψ(3770) is measured, and the Born cross section of ψ(3770) → p̄pπ0is extracted considering interference between resonant and continuum production amplitudes. Two solutions with the same probability and a significance of 1.5 σ are found. The solutions for the Born cross section of ψ(3770) → p̄pπ0are 33.8 ± 1.8 ± 2.1 pb and (formula presented) pb (< 0.22 pb at a 90% confidence level). Using the estimated cross section and a constant decay amplitude approximation, the cross section σ(p̄p → ψ(3770)π0) is calculated for the kinematic situation of the planned P̄ANDA experiment. The maximum cross section corresponding to the two solutions is expected to be less than 0.79 nb at 90% confidence level and 122 ± 10 nb at a center-of-mass energy of 5.26 GeV.
Published: 2014

34. Study of e+e−→pp¯ in the vicinity of ψ(3770)

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Physical Sciences, BESIII, Charmonium decay, Proton form factor, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: Using 2917pb -1 of data accumulated at 3.773GeV, 44.5pb -1 of data accumulated at 3.65GeV and data accumulated during a ψ(3770) line-shape scan with the BESIII detector, the reaction e+e-→pp- is studied considering a possible interference between resonant and continuum amplitudes. The cross section of e+e-→ψ(3770)→pp-, σ(e+e-→ψ(3770)→pp-), is found to have two solutions, determined to be (0.059-0.020+0.070±0.012)pb with the phase angle φ=(255.8-26.6+39.0±4.8)° (
Published: 2014

35. Precision measurement of the mass of the τ lepton

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, and Ji, XB
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: An energy scan near the τ pair production threshold has been performed using the BESIII detector. About 24 pb-1 of data, distributed over four scan points, were collected. This analysis is based on τ pair decays to ee, eμ, eh, μμ, μh, hh, eρ, μρ and πρ final states, where h denotes a charged π or K. The mass of the τ lepton is measured from a maximum likelihood fit to the τ pair production cross-section data to be mτ = (1776.91 ± 0.12-0.13+0.10) MeV=c2, which is currently the most precise value in a single measurement.
Published: 2014

36. Search for the radiative transitions ψ(3770)→γηc and γηc(2S)

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: By using a 2.92 fb-1 data sample taken at √s = 3.773 GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions ψ(3770) → γηc and γηc(2S) through the hadronic decays ηc(ηc (2S)) → K0SK±π+. No significant excess of signal events above background is observed. We set upper limits at a 90% confidence level for the product branching fractions to be B(ψ(3770) →γηc) ±B(ηc → K0SK±π+) < 1.6× 10-5 and B(ψ(3770) →γηc(2S)) ×B(ηc(2S) → K0SK+π+) 6.8 × 10-4 and B(ψ(3770) → γηc(2S)) < 2.0 × 10-3 at a 90% confidence level.
Published: 2014

37. Measurement of the branching fraction for ψ(3686)→ωK+K-

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, LB, Guo, T, Guo, YP, Haddadi, Z, Han, S, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, and Ji, QP
Subjects: Nuclear and Plasma Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: With 1.06 × 108 ψ(3686) events collected with the BESIII detector, the branching fraction of ψ (3686) → ωK+K- is measured to be (1.54 ± 0.04 ± 0.11) × 10-4. This is the most precise result to date, due to the largest ψ(3686) sample, improved signal reconstruction efficiency, good simulation of the detector performance, and a more accurate knowledge of the continuum contribution. Using the branching fraction of J/ψ → ωK+K-, the ratio β(ψ(3868) → ωK+K-)/β(J/ψ → ωK+K-) is determined to be (18.4 ± 3.7)%. This constitutes a significantly improved test of the 12% rule, with the uncertainty now dominated by the J/ψ branching fraction.
Published: 2014

38. Measurement of the D→K−π+ strong phase difference in ψ(3770)→D0D¯0

Author: Collaboration, BESIII, Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, DW, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, LB, Guo, T, Guo, YP, Haddadi, Z, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, and Ji, QP
Subjects: Particle and High Energy Physics, Physical Sciences, BESIII, D-0-(D)over-bar(0) oscillation, Strong phase difference, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: We study D0D̅0 pairs produced in e+e− collisions at √ s = 3.773 GeVusing a data sample of 2.92 fb−1 collected with the BESIII detector. We measuredthe asymmetry ACPKπ of the branching fractions of D → K−π+ in CP-odd and CP-even eigenstates to be (12.7 ± 1.3 ± 0.7) × 10−2. ACPKπ can be used to extract the strong phase difference δKπ between the doubly Cabibbo-suppressed process D̅0 → K−π+ and the Cabibbo-favored process D0 → K−π+. Using world-average values of external parameters, we obtain cos δKπ = 1.02 ±0.11 ±0.06 ±0.01. Here, the first and second uncertainties are statistical and systematic, respectively, while the third uncertainty arises from the external parameters. This is the most precise measurement of δKπ to date.
Published: 2014

39. Observation of electromagnetic Dalitz decays J/ψ→Pe+e-

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fu, JL, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, and Ji, XB
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Based on a sample of (225.3 ± 2.8) × 106 J/ψ events collected with the BESIII detector, the electromagnetic Dalitz decays of J/ψ → Pe+e- (P = η'/η/π∗0) are studied. By reconstructing the pseudoscalar mesons in various decay modes, the decays J/ψ → η' e+e-, J/ψ → η e+e-, and J/ψ → π0 e+e- are observed for the first time. The branching fractions are determined to be B(J/ψ → η' e+e-) = (5.81 ± 0.16 ± 0.31) × 10-5, B(J/ψ → η e+e-) = (1.16 ± 0.07 ± 0.06) × 10-5, and B(J/ψ → π0 e+e-) = (7.56 ± 1.32 ±0.50) × 10-7, where the first errors are statistical and the second ones systematic.
Published: 2014

40. Measurement of χcJ decaying into η′K+K-

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: Using (106.41 ± 0.86) × 106 ψ(3686) events collected with the BESIII detector at BEPCII, we study for the first time the decay χcJ → η'K+K- (J = 1, 2), where η' → γρ0 and η' → ηπ+π-. A partial wave analysis in the covariant tensor amplitude formalism is performed for the decay χc1 → η'K+K-. Intermediate processes χc1 → η' f0 (980), χc1 → η' f0 (1710), χc1 → η' f2' (1525) and χc1 → K∗0 (1430)± K∓ (K∗0 (1430)± → η' K±) are observed with statistical significances larger than 5σ, and their branching fractions are measured.
Published: 2014

41. Search for the rare decays J/ψ→Ds-ρ+ and J/ψ→D¯0K¯*0

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Intellectual and Developmental Disabilities (IDD), Down Syndrome, Brain Disorders, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: A search for the rare decays of J/ψ → Dsρ+ + c.c. and J/ψ → D0K∗0 + c.c. is performed with a data sample of 225.3-million J/ψ events collected with the Beijing Spectrometer III detector. No evident signal is observed. Upper limits on the branching fractions are determined to be B(J/ψ → Ds ρ+ + c.c.) < 1.3 × 10-5 and B(J/ψ → D0K ∗0+ c.c.) < 2.5 × 10-6 at the 90% confidence level.
Published: 2014

42. Precision measurements of B(D+→μ+νμ), the pseudoscalar decay constant fD+, and the quark mixing matrix element |Vcd|

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fu, JL, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We report a measurement of the branching fraction B(D+→μ+νμ)= [3.71±0.19(stat)±0.06(sys)]×10-4 based on 2.92fb-1 of data accumulated at s=3.773GeV with the BESIII detector at the BEPCII collider. This measurement, in conjunction with the Cabibbo-Kobayashi-Maskawa matrix element |Vcd| determined from a global Standard Model fit, implies a value for the weak decay constant fD+=(203.2±5.3±1.8)MeV. Additionally, using this branching fraction measurement together with a lattice QCD prediction for fD+, we find |Vcd|=0.2210±0.0058±0.0047. In either case, these are the most precise results for these quantities to date.
Published: 2014

43. Amplitude analysis of the D+→KS0π+π0 Dalitz plot

Author: Ablikim, M, Achasov, MN, Ai, XC, Albayrak, O, Albrecht, M, Ambrose, DJ, An, FF, An, Q, Bai, JZ, Ferroli, R Baldini, Ban, Y, Bennett, JV, Bertani, M, Bian, JM, Boger, E, Bondarenko, O, Boyko, I, Braun, S, Briere, RA, Cai, H, Cai, X, Cakir, O, Calcaterra, A, Cao, GF, Cetin, SA, Chang, JF, Chelkov, G, Chen, G, Chen, HS, Chen, JC, Chen, ML, Chen, SJ, Chen, X, Chen, XR, Chen, YB, Cheng, HP, Chu, XK, Chu, YP, Cronin-Hennessy, D, Dai, HL, Dai, JP, Dedovich, D, Deng, ZY, Denig, A, Denysenko, I, Destefanis, M, Ding, WM, Ding, Y, Dong, C, Dong, J, Dong, LY, Dong, MY, Du, SX, Fan, JZ, Fang, J, Fang, SS, Fang, Y, Fava, L, Feng, CQ, Fu, CD, Fuks, O, Gao, Q, Gao, Y, Geng, C, Goetzen, K, Gong, WX, Gradl, W, Greco, M, Gu, MH, Gu, YT, Guan, YH, Guo, AQ, Guo, LB, Guo, T, Guo, YP, Han, YL, Harris, FA, He, KL, He, M, He, ZY, Held, T, Heng, YK, Hou, ZL, Hu, C, Hu, HM, Hu, JF, Hu, T, Huang, GM, Huang, GS, Huang, HP, Huang, JS, Huang, L, Huang, XT, Huang, Y, Hussain, T, Ji, CS, Ji, Q, Ji, QP, Ji, XB, and Ji, XL
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Astronomical sciences, Particle and high energy physics
Abstract: We perform an analysis of the D+→ K0Sπ+π0 Dalitz plot using a data set of 2.92 fb-1 of e+e- collisions at the ψ(3770) mass accumulated by the BESIII experiment, in which 166694 candidate events are selected with a background of 15.1%. The Dalitz plot is found to be well represented by a combination of six quasitwo- body decay channels [K0Sρ+, K0Sρ(1450)+, K∗0π+, K0 (1430)0π+, K (1680)0π+, κ0π+] plus a small nonresonant component. Using the fit fractions from this analysis, partial branching ratios are updated with higher precision than previous measurements.
Published: 2014

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