Search results for: Z.A. Liu

Items from 1 to 20 out of 269 results

article

Observation of ψ(3686)→η′e+e−

M. Ablikim, M.N. Achasov, S. Ahmed, M. Albrecht, more

Physics Letters B > 2018 > 783 > C > 452-458

Using a data sample of 448.1×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay ψ(3686)→η′e+e−, with significances of 7.0σ and 6.3σ when reconstructing the η′ meson via its decay modes η′→γπ+π− and η′→π+π−η (η→γγ), respectively. The weighted average branching fraction is determined to be B(ψ(3686)→η′e+e−)=(1...

article

Measurements of absolute branching fractions for Λc+→Ξ0K+ and Ξ(1530)0K+

M. Ablikim, M.N. Achasov, S. Ahmed, M. Albrecht, more

Physics Letters B > 2018 > 783 > C > 200-206

We report the first measurements of absolute branching fractions for the W-exchange-only processes Λc+→Ξ0K+ and Λc+→Ξ(1530)0K+ with the double-tag technique, by analyzing an e+e− collision data sample, that corresponds to an integrated luminosity of 567 pb⁻¹ collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be B(Λc+→Ξ0K+)=(5.90±0.86±0.39)×10−3...

article

Measurement of cross sections of the interactions e+e−→ϕϕω and e+e−→ϕϕϕ at center-of-mass energies from 4.008 to 4.600 GeV

M. Ablikim, M.N. Achasov, S. Ahmed, X.C. Ai, more

Physics Letters B > 2017 > 774 > C > 78-86

Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes e+e−→ϕϕω and e+e−→ϕϕϕ. The Born cross sections are measured and the ratio of the cross sections σ(e+e−→ϕϕω)/σ(e+e−→ϕϕϕ) is estimated to be 1.75±0.22±0.19 averaged over six energy points, where the first uncertainty is statistical and the...

article

Dark photon search in the mass range between 1.5 and 3.4 GeV/c2

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2017 > 774 > C > 252-257

Using a data set of 2.93 fb⁻¹ taken at a center-of-mass energy s=3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) gauge boson, also denoted as a dark photon. We examine the initial state radiation reactions e+e−→e+e−γISR and e+e−→μ+μ−γISR for this search, where the dark photon would appear as an enhancement in the invariant mass distribution of the leptonic...

article

Observation of the decay Λc+→Σ−π+π+π0

M. Ablikim, M.N. Achasov, S. Ahmed, M. Albrecht, more

Physics Letters B > 2017 > 772 > C > 388-393

We report the first observation of the decay Λc+→Σ−π+π+π0, based on data obtained in e+e− annihilations with an integrated luminosity of 567 pb⁻¹ at s=4.6 GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Λc+→Σ−π+π+π0) is determined to be (2.11±0.33(stat.)±0.14(syst.))%. In addition, an improved measurement of B(Λ+c→Σ−π+π+) is determined...

article

Measurements of cross section of e+e−→pp¯π0 at center-of-mass energies between 4.008 and 4.600 GeV

M. Ablikim, M.N. Achasov, S. Ahmed, X.C. Ai, more

Physics Letters B > 2017 > 771 > C > 45-51

Based on e+e− annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center-of-mass energies from 4.008 to 4.600 GeV, measurements of the Born cross section of e+e−→pp¯π0 are performed. No significant resonant structure is observed in the measured energy dependence of the cross section. The upper limit on the Born cross section of e+e−→Y(4260)→pp¯π0 at the 90% C...

article

Study of J/ψ and ψ(3686)→Σ(1385)0Σ¯(1385)0 and Ξ0Ξ¯0

M. Ablikim, M.N. Achasov, S. Ahmed, X.C. Ai, more

Physics Letters B > 2017 > 770 > C > 217-225

We study the decays of J/ψ and ψ(3686) to the final states Σ(1385)0Σ¯(1385)0 and Ξ0Ξ¯0 based on a single baryon tag method using data samples of (1310.6±7.0)×106 J/ψ and (447.9±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decays to Σ(1385)0Σ¯(1385)0 are observed for the first time. The measured branching fractions of J/ψ and ψ(3686) to Ξ0Ξ¯0 are in good agreement...

article

Measurement of the absolute branching fraction for Λc+→Λμ+νμ

M. Ablikim, M.N. Achasov, S. Ahmed, X.C. Ai, more

Physics Letters B > 2017 > 767 > C > 42-47

We report the first measurement of the absolute branching fraction for Λc+→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data produced at a center-of-mass energy s=4.6 GeV, collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb−1. The branching fraction is determined to be B(Λc+→Λμ+νμ)=(3.49±0.46(stat)±0.27(syst))%...

article

Measurements of the branching fractions for D+→KS0KS0K+, KS0KS0π+ and D0→KS0KS0, KS0KS0KS0

M. Ablikim, M.N. Achasov, S. Ahmed, X.C. Ai, more

Physics Letters B > 2017 > 765 > C > 231-237

By analyzing 2.93fb−1 of data taken at the ψ(3770) resonance peak with the BESIII detector, we measure the branching fractions for the hadronic decays D+→KS0KS0K+, D+→KS0KS0π+, D0→KS0KS0 and D0→KS0KS0KS0. They are determined to be B(D+→KS0KS0K+)=(2.54±0.05stat.±0.12sys.)×10−3, B(D+→KS0KS0π+)=(2.70±0.05stat.±0.12sys.)×10−3, B(D0→KS0KS0)=(1.67±0.11stat.±0.11sys.)×10−4 and B(D0→KS0KS0KS0)=(7.21±0.33stat...

article

Measurement of the leptonic decay width of J/ψ using initial state radiation

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2016 > 761 > C > 98-103

Using a data set of 2.93 fb⁻¹ taken at a center-of-mass energy of s=3.773 GeV with the BESIII detector at the BEPCII collider, we measure the process e+e−→J/ψγ→μ+μ−γ and determine the product of the branching fraction and the electronic width Bμμ⋅Γee=(333.4±2.5stat±4.4sys) eV. Using the earlier-published BESIII result for Bμμ=(5.973±0.007stat±0.037sys)%, we derive the J/ψ electronic width Γee=(5.58±0...

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2016 > 753 > C > 103-109

By analyzing a data set of 2.92 fb−1 of e+e− collision data taken at s=3.773 GeV and 106.41×106 ψ(3686) decays taken at s=3.686 GeV with the BESIII detector at the BEPCII collider, we measure the branching fraction and the partial decay width for ψ(3770)→γχc0 to be B(ψ(3770)→γχc0)=(6.88±0.28±0.67)×10−3 and Γ[ψ(3770)→γχc0]=(187±8±19) keV, respectively. These are the most precise measurements to date.

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2016 > 753 > C > 629-638

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...

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2015 > 750 > C > 466-474

We study Ds+ decays to final states involving the η′ with a 482 pb−1 data sample collected at s=4.009 GeV with the BESIII detector at the BEPCII collider. We measure the branching fractions B(Ds+→η′X)=(8.8±1.8±0.5)% and B(Ds+→η′ρ+)=(5.8±1.4±0.4)% where the first uncertainty is statistical and the second is systematic. In addition, we estimate an upper limit on the non-resonant branching ratio B(Ds+→η′π+π0)<5...

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2015 > 749 > C > 414-420

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...

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2015 > 744 > Complete > 339-346

We report a measurement of the parameter y _C _P in D ⁰ -D ⁰ oscillations performed by taking advantage of quantum coherence between pairs of D ⁰ D ⁰ mesons produced in e ⁺ e ^- annihilations near threshold. In this work, doubly-tagged D ⁰ D ⁰ events, where one D decays to a CP eigenstate and the other D decays in a semileptonic...

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2014 > 735 > Complete > 101-107

Using 2917 pb ^- ¹ of data accumulated at 3.773 GeV, 44.5 pb ^- ¹ of data accumulated at 3.65 GeV 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...

article

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

M. Ablikim, M.N. Achasov, X.C. Ai, O. Albayrak, more

Physics Letters B > 2014 > 734 > Complete > 227-233

We study D ⁰ D ⁰ pairs produced in e ⁺ e ^- collisions at s=3.773 GeV using a data sample of 2.92 fb ^- ¹ collected with the BESIII detector. We measured the asymmetry A _K _π ^C ^P of the branching fractions of D->K ^- π ⁺ in CP-odd and CP-even eigenstates to be (12.7+/-1.3+/-0.7)x10 ^- ² . A _K _π ^C...

article

Precision measurement of the branching fractions of J/ψ→π+π−π0 and ψ′→π+π−π0

M. Ablikim, M.N. Achasov, D. Alberto, D.J. Ambrose, more

Physics Letters B > 2012 > 710 > 4-5 > 594-599

We study the decays of the J/ψ and ψ′ mesons to π+π−π0 using data samples at both resonances collected with the BES III detector in 2009. We measure the corresponding branching fractions with unprecedented precision and provide mass spectra and Dalitz plots. The branching fraction for J/ψ→π+π−π0 is determined to be(2.137±0.004 (stat.)−0.056+0.058 (syst.)−0.026+0.027 (norm.))×10−2, and the branching...

chapter

New developments in next generation platform standards for physics instrumentation & controls

R.S. Larsen, R.W. Downing, Z.A. Liu, A.P. Lowell, more

2011 IEEE Nuclear Science Symposium Conference Record > 2023 - 2027

2011 IEEE Nuclear Science Symposium and Medical Imaging Conference (2011 NSS/MIC)

The development of xTCA for Physics standard extensions began in June 2009 with the formation of hardware and software technical subcommittees under the PICMG industry consortium. This was a new experiment in standards collaboration since up to this time labs had developed standards without members from industry and PICMG membership consisted only of companies supporting telecom and some military...

article

Observation of charged κ in J/ψ→K⁎(892)∓KSπ±, K⁎(892)∓→KSπ∓ at BESII

M. Ablikim, J.Z. Bai, Y. Bai, Y. Ban, more

Physics Letters B > 2011 > 698 > 3 > 183-190

Using 58 million J/ψ decays obtained by BESII, a charged κ particle is observed in the analysis of the KSπ± system recoiling against K⁎(892)∓ selected in J/ψ→KSKSπ+π−. The mass and width values of the charged κ are obtained to be (826±49−34+49) MeV/c2 and (449±156−81+144) MeV/c2 for the Breit–Wigner parameters, and the pole position is determined to be (764±63−54+71)−i(306±149−85+143) MeV/c2. They...

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Search results for: Z.A. Liu

Observation of ψ(3686)→η′e+e−

Measurements of absolute branching fractions for Λc+→Ξ0K+ and Ξ(1530)0K+

Measurement of cross sections of the interactions e+e−→ϕϕω and e+e−→ϕϕϕ at center-of-mass energies from 4.008 to 4.600 GeV

Dark photon search in the mass range between 1.5 and 3.4 GeV/c2

Observation of the decay Λc+→Σ−π+π+π0

Measurements of cross section of e+e−→pp¯π0 at center-of-mass energies between 4.008 and 4.600 GeV

Study of J/ψ and ψ(3686)→Σ(1385)0Σ¯(1385)0 and Ξ0Ξ¯0

Measurement of the absolute branching fraction for Λc+→Λμ+νμ

Measurements of the branching fractions for D+→KS0KS0K+, KS0KS0π+ and D0→KS0KS0, KS0KS0KS0

Measurement of the leptonic decay width of J/ψ using initial state radiation

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

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

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

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

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

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

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

Precision measurement of the branching fractions of J/ψ→π+π−π0 and ψ′→π+π−π0

New developments in next generation platform standards for physics instrumentation & controls

Observation of charged κ in J/ψ→K⁎(892)∓KSπ±, K⁎(892)∓→KSπ∓ at BESII

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