# Observation of a narrow mass state decaying into $\Upsilon(1S) + \gamma$ in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV

### Description

Using data corresponding to an integrated luminosity of 1.3 fb{sup -1}, we observe a narrow mass state decaying into {Upsilon}(1S) + {gamma}, where the {Upsilon}(1S) meson is detected by its decay into a pair of oppositely charged muons, and the photon is identified through its conversion into an electron-positron pair. The significance of this observation is 5.6 standard deviations. The mass of the state is centered at 10.551 {+-} 0.014(stat.) {+-} 0.017(syst.) GeV/c{sup 2}, which is consistent with that of the state recently observed by the ATLAS Collaboration.

6 pages

### Creation Information

Abazov, Victor Mukhamedovich & al., et March 1, 2012.

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## What

### Description

Using data corresponding to an integrated luminosity of 1.3 fb{sup -1}, we observe a narrow mass state decaying into {Upsilon}(1S) + {gamma}, where the {Upsilon}(1S) meson is detected by its decay into a pair of oppositely charged muons, and the photon is identified through its conversion into an electron-positron pair. The significance of this observation is 5.6 standard deviations. The mass of the state is centered at 10.551 {+-} 0.014(stat.) {+-} 0.017(syst.) GeV/c{sup 2}, which is consistent with that of the state recently observed by the ATLAS Collaboration.

6 pages

### Identifier

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• Report No.: FERMILAB-PUB-12-084-E
• Grant Number: AC02-07CH11359
• DOI: 10.1103/PhysRevD.86.031103 | External Link
• Office of Scientific & Technical Information Report Number: 1038947

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## When

### Creation Date

• March 1, 2012

### Added to The UNT Digital Library

• May 19, 2016, 3:16 p.m.

### Description Last Updated

• June 10, 2016, 8:48 p.m.

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Abazov, Victor Mukhamedovich & al., et. Observation of a narrow mass state decaying into $\Upsilon(1S) + \gamma$ in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV, article, March 1, 2012; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc829483/: accessed December 10, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.