2026-04-13T07:25:07Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1856172025-11-21T05:47:03Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Camboni, Alessandro author Comerma-Montells, A. author Garrido Beltrán, Lluís author Picatoste Olloqui, Eduardo author Potterat, Cédric author Rives Molina, Vicente José author LHCb Collaboration author 2022-05-16T14:54:01Z 2022-05-16T14:54:01Z 2014-01 2022-05-16T14:54:01Z A search for the D0→ π +π −µ +µ − decay, where the muon pair does not originate from a resonance, is performed using proton-proton collision data corresponding to an integrated luminosity of 1.0 fb−1 recorded by the LHCb experiment at a centreof-mass energy of 7 TeV. No signal is observed and an upper limit on the relative branching fraction with respect to the resonant decay mode D0→ π +π −φ(→ µ +µ −), under the assumption of a phase-space model, is found to be B(D0→ π +π −µ +µ −)/B(D0 → π +π −φ(→ µ +µ −)) < 0.96 at 90% confidence level. The upper limit on the absolute branching fraction is evaluated to be B(D0→ π +π −µ +µ −) < 5.5 × 10−7 at 90% confidence level. This is the most stringent to date. Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments Search for the decay D-0 -> pi(+)pi(-)mu(+)mu(-)