The
BESIII
collaboration
Ablikim, M.
;
Achasov, M.N.
;
Ai, X.C.
;
*et al. *

Phys.Rev.D 92 (2015) 072012, 2015.

https://inspirehep.net/literature/1391138
Inspire Record
1391138
DOI
10.17182/hepdata.74726
https://doi.org/10.17182/hepdata.74726
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 to be $\mathcal B(D^0 \to K^-e^+\nu_e)=(3.505\pm 0.014 \pm 0.033)\%$ and $\mathcal B(D^0 \to \pi^-e^+\nu_e)=(0.295\pm 0.004\pm 0.003)\%$. From a study of the differential decay rates we obtain the products of hadronic form factor and the magnitude of the CKM matrix element $f_{+}^K(0)|V_{cs}|=0.7172\pm0.0025\pm 0.0035$ and $f_{+}^{\pi}(0)|V_{cd}|=0.1435\pm0.0018\pm 0.0009$. Combining these products with the values of $|V_{cs(d)}|$ from the SM constraint fit, we extract the hadronic form factors $f^K_+(0) = 0.7368\pm0.0026\pm 0.0036$ and $f^\pi_+(0) = 0.6372\pm0.0080\pm 0.0044$, and their ratio $f_+^{\pi}(0)/f_+^{K}(0)=0.8649\pm 0.0112\pm 0.0073$. 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 $f_+^{K(\pi)}(0) |V_{cs(d)}|$ and the lattice QCD value for $f^{K(\pi)}_+(0)$ are used to extract values of the CKM matrix elements of $|V_{cs}|=0.9601 \pm 0.0033 \pm 0.0047 \pm 0.0239$ and $|V_{cd}|=0.2155 \pm 0.0027 \pm 0.0014 \pm 0.0094$, where the third errors are due to the uncertainties in lattice QCD calculations of the form factors. Using the LCSR value for $f_+^\pi(0)/f_+^K(0)$, we determine the ratio $|V_{cd}|/|V_{cs}|=0.238\pm 0.004\pm 0.002\pm 0.011$, 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.

2
data tables

The
HERMES
collaboration
Airapetian, A.
;
Akopov, N.
;
Akopov, Z.
;
*et al. *

Eur.Phys.J.C 75 (2015) 600, 2015.

https://inspirehep.net/literature/1391139
Inspire Record
1391139
DOI
10.17182/hepdata.75465
https://doi.org/10.17182/hepdata.75465
Hard exclusive electroproduction of $\omega$ mesons is studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. The amplitudes of five azimuthal modulations of the single-spin asymmetry of the cross section with respect to the transverse proton polarization are measured. They are determined in the entire kinematic region as well as for two bins in photon virtuality and momentum transfer to the nucleon. Also, a separation of asymmetry amplitudes into longitudinal and transverse components is done. These results are compared to a phenomenological model that includes the pion pole contribution. Within this model, the data favor a positive $\pi\omega$ transition form factor.

4
data tables

The definition of intervals and the mean values of the kinematic variables.

Igo, G.J.
;
Friedes, J.L.
;
Palevsky, H.
;
*et al. *

Nucl.Phys.B 3 (1967) 181-187, 1967.

https://inspirehep.net/literature/1389662
Inspire Record
1389662
DOI
10.17182/hepdata.33327
https://doi.org/10.17182/hepdata.33327
Total cross sections have been measured for H, He, 6 Li, C, O and Pb targets for 1 GeV incident energy protons. From the differential elastic scattering data published elsewhere, we also obtain the total elastic scattering and reaction cross sections for H, He, C and O. When our data are combined with other measurements in the same energy region, it is found that the total and reaction cross sections can be fit by the formulae σ T = 47 A 0.82 and σ R = 42 A 0.67 mb. It is also observed that the total and reaction cross sections for negative pions on nuclei can also be fit with these same A -dependencies.

1
data table

No description provided.

Derado, I.
;
Poirier, J.A.
;
Biswas, N.N.
;
*et al. *

Phys.Lett.B 24 (1967) 112-114, 1967.

https://inspirehep.net/literature/1389618
Inspire Record
1389618
DOI
10.17182/hepdata.29606
https://doi.org/10.17182/hepdata.29606
We have studied ϱ − production at 8 GeV / c . The data cannot be explained by one-pion-exchange with absorption and we conclude that vector exchange contributes. This contrasts with ϱ o production at this energy and ϱ − production at lower energy.

1
data table

No description provided.

Apel, W.D.
;
Ausländer, J.
;
Müller, H.
;
*et al. *

Phys.Lett.B 55 (1975) 111-116, 1975.

https://inspirehep.net/literature/1388800
Inspire Record
1388800
DOI
10.17182/hepdata.27881
https://doi.org/10.17182/hepdata.27881
Results are given for the production differential cross sections and the ω decay angular distribution in terms of the ω spin density matrix elements.

3
data tables

PAPER ALSO GIVES OFF-DIAGONAL ELEMENTS OF THE ERROR COVARIANCE MATRIX.

PAPER ALSO GIVES OFF-DIAGONAL ELEMENTS OF THE ERROR COVARIANCE MATRIX.

No description provided.

Version 4

Measurement of the $e^+ e^− \to \pi^+ \pi^−$ cross section between 600 and 900 MeV using initial state radiation
The
BESIII
collaboration
Ablikim, M.
;
Achasov, M.N.
;
Adlarson, P.
;
*et al. *

Phys.Lett.B 753 (2016) 629-638, 2016.

https://inspirehep.net/literature/1385603
Inspire Record
1385603
DOI
10.17182/hepdata.73898
https://doi.org/10.17182/hepdata.73898
In Phys. Lett. B 753, 629-638 (2016) [arXiv:1507.08188] the BESIII collaboration published a cross section measurement of the process $e^+e^-\to \pi^+ \pi^-$ in the energy range between 600 and 900 MeV. In this erratum we report a corrected evaluation of the statistical errors in terms of a fully propagated covariance matrix. The correction also yields a reduced statistical uncertainty for the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, which now reads as $a_\mu^{\pi\pi\mathrm{, LO}}(600 - 900\,\mathrm{MeV}) = (368.2 \pm 1.5_{\rm stat} \pm 3.3_{\rm syst})\times 10^{-10}$. The central values of the cross section measurement and of $a_\mu^{\pi\pi\mathrm{, LO}}$, as well as the systematic uncertainties remain unchanged.

4
data tables

The
BESIII
collaboration
Ablikim, M.
;
Achasov, M.N.
;
Ai, X.C.
;
*et al. *

Phys.Rev.Lett. 116 (2016) 042001, 2016.

https://inspirehep.net/literature/1384778
Inspire Record
1384778
DOI
10.17182/hepdata.73802
https://doi.org/10.17182/hepdata.73802
We present a measurement of the azimuthal asymmetries of two charged pions in the inclusive process $e^+e^-\rightarrow \pi\pi X$ based on a data set of 62 $\rm{pb}^{-1}$ at the center-of-mass energy $\sqrt{s}=3.65$ GeV collected with the BESIII detector. These asymmetries can be attributed to the Collins fragmentation function. We observe a nonzero asymmetry, which increases with increasing pion momentum. As our energy scale is close to that of the existing semi-inclusive deep inelastic scattering experimental data, the measured asymmetries are important inputs for the global analysis of extracting the quark transversity distribution inside the nucleon and are valuable to explore the energy evolution of the spin-dependent fragmentation function.

2
data tables

The
BESIII
collaboration
Ablikim, M.
;
Achasov, M.N.
;
Ai, X.C.
;
*et al. *

Phys.Rev.Lett. 115 (2015) 112003, 2015.

https://inspirehep.net/literature/1377204
Inspire Record
1377204
DOI
10.17182/hepdata.73771
https://doi.org/10.17182/hepdata.73771
Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state $Z_c(3900)^{0}$ with a significance of $10.4\sigma$. The mass and width are measured to be $3894.8\pm2.3\pm3.2$ MeV/$c^2$ and $29.6\pm8.2\pm8.2$~MeV, respectively, where the first error is statistical and the second systematic. The Born cross section for $e^+e^-\to\pi^0\pi^0 J/\psi$ and the fraction of it attributable to $\pi^0 Z_c(3900)^{0}\to\pi^0\pi^0 J/\psi$ in the range $E_{cm}=4.19-4.42$ GeV are also determined. We interpret this state as the neutral partner of the four-quark candidate $Z_c(3900)^\pm$.

1
data table

The
BESIII
collaboration
Ablikim, M.
;
Achasov, M.N.
;
Ai, X.C.
;
*et al. *

Phys.Rev.D 92 (2015) 012008, 2015.

https://inspirehep.net/literature/1366025
Inspire Record
1366025
DOI
10.17182/hepdata.73692
https://doi.org/10.17182/hepdata.73692
Using data samples collected at center of mass energies of $\sqrt{s}$ = 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 $Y(4260)\rightarrow J/\psi \eta \pi^{0}$. No signal is observed, and upper limits on the cross section $\sigma(e^{+}e^{-}\rightarrow J/\psi \eta \pi^{0})$ at the 90\% confidence level are determined to be 3.6, 1.7, 2.4, 1.4, 0.9 and 1.9 pb, respectively.

1
data table

The
BESIII
collaboration
Ablikim, M.
;
Achasov, M.N.
;
Ai, X.C.
;
*et al. *

Phys.Rev.D 92 (2015) 012001, 2015.

https://inspirehep.net/literature/1364494
Inspire Record
1364494
DOI
10.17182/hepdata.73672
https://doi.org/10.17182/hepdata.73672
We report the first observation of the Dalitz decay $\eta' \to \gamma e^+e^-$, based on a data sample of 1.31 billion $J/\psi$ events collected with the BESIII detector. The $\eta'$ mesons are produced via the $J/\psi \to \gamma \eta'$ decay process. The ratio $\Gamma(\eta' \to \gamma e^+ e^-)/\Gamma(\eta'\to\gamma\gamma)$ is measured to be $(2.13\pm0.09(\text{stat.})\pm0.07(\text{sys.}))\times10^{-2}$. This corresponds to a branching fraction ${\cal B}(\eta' \to \gamma e^+e^-)= (4.69 \pm0.20(\text{stat.})\pm0.23(\text{sys.}))\times10^{-4}$. 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.

2
data tables

Values of $|F|^2$ in each $M(e^+e^-)$ bin.