# Observation of a Narrow Near-Threshold Structure in the $J/\psi\phi$ Mass Spectrum in $B^+\to J/\psi\phi K^+$ Decays

### Description

Observation is reported for a structure near the J/{psi}{phi} threshold in B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) {+-} 0.6(syst) MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4}(stat) {+-} 2.5(syst) MeV/c{sup 2}, which are consistent with the previous measurements reported as evidence of the Y(4140).

4 pages

### Creation Information

collaboration, Kai Yi for the CDF October 1, 2010.

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## What

### Description

Observation is reported for a structure near the J/{psi}{phi} threshold in B{sup +} {yields} J/{psi}{phi}K{sup +} decays produced in {bar p}p collisions at {radical}s = 1.96 TeV with a statistical significance of beyond 5 standard deviations. There are 19 {+-} 6 events observed for this structure at a mass of 4143.4{sub -3.0}{sup +2.9}(stat) {+-} 0.6(syst) MeV/c{sup 2} and a width of 15.3{sub -6.1}{sup +10.4}(stat) {+-} 2.5(syst) MeV/c{sup 2}, which are consistent with the previous measurements reported as evidence of the Y(4140).

4 pages

### Identifier

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• Report No.: FERMILAB-CONF-10-421-E
• Grant Number: AC02-07CH11359
• Office of Scientific & Technical Information Report Number: 992654

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## When

### Creation Date

• October 1, 2010

### Added to The UNT Digital Library

• Oct. 14, 2017, 8:36 a.m.

### Description Last Updated

• Oct. 25, 2017, 1:46 p.m.

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collaboration, Kai Yi for the CDF. Observation of a Narrow Near-Threshold Structure in the $J/\psi\phi$ Mass Spectrum in $B^+\to J/\psi\phi K^+$ Decays, article, October 1, 2010; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1014094/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.