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rivet Analysis
Inclusive Lambda/c production in e+ e- annihilations at s**(1/2) = 10.54-GeV and in Upsilon(4S) decays.

The BaBar collaboration Aubert, Bernard ; Bona, M. ; Boutigny, D. ; et al.
Phys.Rev.D 75 (2007) 012003, 2007.
Inspire Record 725377 DOI 10.17182/hepdata.22089

We present measurements of the total production rates and momentum distributions of the charmed baryon $\Lambda_c^+$ in $e^+e^- \to$ hadrons at a center-of-mass energy of 10.54 GeV and in $\Upsilon(4S)$ decays. In hadronic events at 10.54 GeV, charmed hadrons are almost exclusively leading particles in $e^+e^- \to c\bar{c}$ events, allowing direct studies of $c$-quark fragmentation. We measure a momentum distribution for $\Lambda_c^+$ baryons that differs significantly from those measured previously for charmed mesons. Comparing with a number of models, we find none that can describe the distribution completely. We measure an average scaled momentum of $\left< x_p \right> = 0.574\pm$0.009 and a total rate of $N_{\Lambda c}^{q\bar{q}} = 0.057\pm$0.002(exp.)$\pm$0.015(BF) $\Lambda_c^+$ per hadronic event, where the experimental error is much smaller than that due to the branching fraction into the reconstructed decay mode, $pK^-\pi^+$. In $\Upsilon (4S)$ decays we measure a total rate of $N_{\Lambda c}^{\Upsilon} = 0.091\pm$0.006(exp.)$\pm$0.024(BF) per $\Upsilon(4S)$ decay, and find a much softer momentum distribution than expected from B decays into a $\Lambda_c^+$ plus an antinucleon and one to three pions.

4 data tables
Table 1

LAMBDA/C+ differential production rate per hadronic event for the continuum at cm energy 10.54 GeV.

Table 2

The integrated number of LAMBDA/C+'s per hadronic event for the continuum at cm energy 10.54 GeV.

Table 3

LAMBDA/C+ differential production rate per UPSILON(4S) decay at cm energy 10.58 GeV.

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rivet Analysis
A Measurement of asymmetry in the decay lambda(c)+ ---> lambda pi+

The ARGUS collaboration Albrecht, H. ; Ehrlichmann, H. ; Hamacher, T. ; et al.
Phys.Lett.B 274 (1992) 239-245, 1992.
Inspire Record 319105 DOI 10.17182/hepdata.29262

Using the ARGUS detector at the e + e − storage ring DORIS II at DESY, we have observed parity violation in the decay Λ ± c → Λπ ± . We measure the coefficient of parity violation, α Λ c , to be −0.96±0.42. In addition, we measure σ BR ( Λ + c → Λπ + and σ BR ( Λ + c → Σ 0 π + ) to be, respectively, (2.2±0.3±0.4) pb and (2.0±0.7±0.4) pb.

1 data table
Table 1

No description provided.


Observations of Lambda(charm)+ semileptonic decay

The ARGUS collaboration Albrecht, H. ; Ehrlichmann, H. ; Hamacher, T. ; et al.
Phys.Lett.B 269 (1991) 234-242, 1991.
Inspire Record 316473 DOI 10.17182/hepdata.29351

Direct observations of the semileptonic decay of Λ c + in the decay channels Λ c + → Λ e + X and Λ c + → Λμ + X have been made using the ARGUS detector at the DORIS II e + e − storage ring. The cross section times branching ratio were found to be σ (e + e − → Λ c + X)·BR( Λ c + → Λ e + X)=4.20±1.28±0.71 pb and σ (e + e − → Λ c + X)·BR( Λ c + → Λμ + X)=3.91±2.02±0.90 pb.

1 data table
Table 1

No description provided.