We search for new resonances, Y, with mass, M Y, in the range from 30 to 89 GeV, produced via the reaction e +e -→Z 0→γY, where Y subsequently decays into e +e -, μ +μ - or hadrons. We use 5.5. pb -1 of data collected in the energy range 88.2 ≤ √s ≤ 94.2 GeV, near the Z 0 peak. We obtain the following upper limits, at the 95% confidence level, on the product of the branching ratios: BR(Z 0→γY)×BR(Y→e +e -)<2.8×10 -4 for 30<M Y<89, BR(Z 0→γY)×BR(Y→μ +μ -)<2.3×10 -4 for 30<M Y<89, BR(Z 0→γY)×BR(Y→hadrons)<4.7×10 -4 for 30<M Y<86. These limits are valid for resonances with widths smaller than our mass resolution.
Search for narrow high-mass resonances in radiative decays of the Z 0 / A. O., Aguilar Benitez; Aloisio, Alberto; Alviggi, Mariagrazia; Chiefari, Giovanni; Merola, Leonardo; Napolitano, Marco; Paternoster, Giovanni; Patricelli, Sergio; Sciacca, Crisostomo. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 262:(1991), pp. 155-162.
Search for narrow high-mass resonances in radiative decays of the Z 0
ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CHIEFARI, GIOVANNI;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATERNOSTER, GIOVANNI;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO
1991
Abstract
We search for new resonances, Y, with mass, M Y, in the range from 30 to 89 GeV, produced via the reaction e +e -→Z 0→γY, where Y subsequently decays into e +e -, μ +μ - or hadrons. We use 5.5. pb -1 of data collected in the energy range 88.2 ≤ √s ≤ 94.2 GeV, near the Z 0 peak. We obtain the following upper limits, at the 95% confidence level, on the product of the branching ratios: BR(Z 0→γY)×BR(Y→e +e -)<2.8×10 -4 for 30<M Y<89, BR(Z 0→γY)×BR(Y→μ +μ -)<2.3×10 -4 for 30<M Y<89, BR(Z 0→γY)×BR(Y→hadrons)<4.7×10 -4 for 30<M Y<86. These limits are valid for resonances with widths smaller than our mass resolution.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
