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³_ΛH and ³_{bar{Λ}}mathrm{bar{H}} lifetime measurement in Pb-Pb collisions at sqrt{s_(NN)} = 5.02 TeV via two-body decay

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arxiv 1907.06906 v2 pith:LNZ45W5C submitted 2019-07-16 nucl-ex hep-ex

³_ΛH and ³_{bar{Λ}}mathrm{bar{H}} lifetime measurement in Pb-Pb collisions at sqrt{s_(NN)} = 5.02 TeV via two-body decay

classification nucl-ex hep-ex
keywords lifetimemathrmbeenhypertritonanti-collisionsdecaylambda
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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An improved value for the lifetime of the (anti-)hypertriton has been obtained using the data sample of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}} = $ 5.02 TeV collected by the ALICE experiment at the LHC. The (anti-)hypertriton has been reconstructed via its charged two-body mesonic decay channel and the lifetime has been determined from an exponential fit to the d$N$/d($ct$) spectrum. The measured value, $\tau$ = 242$^{+34}_{-38}$ (stat.) $\pm$ 17 (syst.) ps, is compatible with all the available theoretical predictions, thus contributing to the solution of the longstanding hypertriton lifetime puzzle.

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    Hypertriton yields and Lambda ratios increase at lower collision energies but remain a factor of two below thermal models, while the double ratio to triton production stays constant at 0.4, pointing to intrinsically l...