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Indications of suppression of excited? States in Pb-Pb collisions at sNN2.76 TeV

Abstract: A comparison of the relative yields of resonances in the þ decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV=c and pseudorapidity below 2.4, the double ratio of the ð2SÞ and ð3SÞ excited states to the ð1SÞ ground state in Pb-Pb and pp collisions, ½ð2S þ 3SÞ=ð1SÞPb-Pb=½ð2S þ 3SÞ=ð1SÞpp, is found to be 0:31þ0:19 0:15ðstatÞ0:03ðsystÞ. The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.

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Authorship: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hänsel S., Hoch M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V.,

Fuente: Physical Review Letters, 2011, 107(5), 052302

Publisher: American Physical Society

Publication date: 01/07/2011

No. of pages: 15

Publication type: Article

DOI: 10.1103/PhysRevLett.107.052302

ISSN: 0031-9007,1079-7114

Publication Url: https://doi.org/10.1103/PhysRevLett.107.052302

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