We perform for the first time an amplitude analysis of the decay D+ -> K-S(0)pi(+)eta and report the observation of the decay D+ -> K(S)(0)a0(980)(+) using 2.93 fb(-1) of e(+)e(-) collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector. As the only W-annihilation-free decay among D to a(0) (980) pseudoscalar, S is the ideal decay in extracting the contributions of the W-emission amplitudes involving a(0)(980) and to study the final-state interactions. The absolute branching fraction of -> K-S(0)pi(+)eta is measured to be (1.27 +/- 0.04(stat) +/- 0.03(syst))%. The branching fractions of intermediate processes D+ -> K(S)(0)a(0)(980)(+) with a(0)(980)(+) -> pi(+)eta and D+ -> pi(+)(K) over bar (0)*(1430)(0) with over bar (K) over bar (0)*(1430)(0) -> K-S(0)eta are measured to be (1.33 +/- 0.05(stat) +/- 0.04(syst))% and (0.14 +/- 0.03(stat) +/- 0.01syst)%, respectively.
Observation of D+ → KS0 a0 (980)+ in the Amplitude Analysis of D+ → KS0 π+η
Garzia, I.;Gramigna, S.;
2024
Abstract
We perform for the first time an amplitude analysis of the decay D+ -> K-S(0)pi(+)eta and report the observation of the decay D+ -> K(S)(0)a0(980)(+) using 2.93 fb(-1) of e(+)e(-) collision data taken at a center-of-mass energy of 3.773 GeV with the BESIII detector. As the only W-annihilation-free decay among D to a(0) (980) pseudoscalar, S is the ideal decay in extracting the contributions of the W-emission amplitudes involving a(0)(980) and to study the final-state interactions. The absolute branching fraction of -> K-S(0)pi(+)eta is measured to be (1.27 +/- 0.04(stat) +/- 0.03(syst))%. The branching fractions of intermediate processes D+ -> K(S)(0)a(0)(980)(+) with a(0)(980)(+) -> pi(+)eta and D+ -> pi(+)(K) over bar (0)*(1430)(0) with over bar (K) over bar (0)*(1430)(0) -> K-S(0)eta are measured to be (1.33 +/- 0.05(stat) +/- 0.04(syst))% and (0.14 +/- 0.03(stat) +/- 0.01syst)%, respectively.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.