Measurement of the ηc(1S) production cross-section in proton-proton collisions via the decay ηc(1S) → pp[bar]
The production of the $$\eta _c (1S)$$state in proton-proton collisions is probed via its decay to the $$p\overline{p}$$final state with the LHCb detector, in the rapidity range $$2.0 < y < 4.5$$and in the meson transverse-momentum range $$p_\mathrm{T} > 6.5 \mathrm{{\,GeV/}{ c}} $$. The cr...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Körperschaft: | |
| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
04 July 2015
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| In: |
The European physical journal. C, Particles and fields
Year: 2015, Jahrgang: 75, Heft: 7, Pages: 1-12 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-015-3502-x |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-015-3502-x
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| Verfasserangaben: | LHCb Collaboration |
| Zusammenfassung: | The production of the $$\eta _c (1S)$$state in proton-proton collisions is probed via its decay to the $$p\overline{p}$$final state with the LHCb detector, in the rapidity range $$2.0 < y < 4.5$$and in the meson transverse-momentum range $$p_\mathrm{T} > 6.5 \mathrm{{\,GeV/}{ c}} $$. The cross-section for prompt production of $$\eta _c (1S)$$mesons relative to the prompt $${{ J}}/{\psi } $$cross-section is measured, for the first time, to be $$\sigma _{\eta _c (1S)}/\sigma _{{{{ J}}/{\psi }}} = 1.74\, \pm \,0.29\, \pm \, 0.28\, \pm \,0.18 _{{\mathcal{B}}}$$at a centre-of-mass energy $${\sqrt{s}} = 7 {~\mathrm{TeV}}$$using data corresponding to an integrated luminosity of 0.7 fb$$^{-1}$$, and $$\sigma _{\eta _c (1S)}/\sigma _{{{{ J}}/{\psi }}} = 1.60 \pm 0.29 \pm 0.25 \pm 0.17 _{{\mathcal{B}}}$$at $${\sqrt{s}} = 8 {~\mathrm{TeV}}$$using 2.0 fb$$^{-1}$$. The uncertainties quoted are, in order, statistical, systematic, and that on the ratio of branching fractions of the $$\eta _c (1S)$$and $${{ J}}/{\psi } $$decays to the $$p\overline{p}$$final state. In addition, the inclusive branching fraction of $${b} $$-hadron decays into $$\eta _c (1S)$$mesons is measured, for the first time, to be $${\mathcal{B}}( b {\rightarrow } \eta _c X ) = (4.88\, \pm \,0.64\, \pm \,0.29\, \pm \, 0.67 _{{\mathcal{B}}}) \times 10^{-3}$$, where the third uncertainty includes also the uncertainty on the $${{ J}}/{\psi } $$inclusive branching fraction from $${b} $$-hadron decays. The difference between the $${{ J}}/{\psi } $$and $$\eta _c (1S)$$meson masses is determined to be $$114.7 \pm 1.5 \pm 0.1 {\mathrm {\,MeV\!/}c^2} $$. |
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| Beschreibung: | Im Titel ist "c" tiefgestellt Im Titel steht der zweite Buchstabe p mit einem Oberstrich LHCb Collaboration: R. Aaij, B. Adeva, O. Aquines Gutierrez, S. Bachmann, C.B. Beteta, A. Bien, J. Blouw, M. Britsch, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, C. Färber, M. Fontana, E. Gersabeck, L. Grillo, X. Han, S. Hansmann-Menzemer, A. Jaeger, M. Kolpin, K. Kreplin, G. Krocker, B. Leverington, J. Marks, M. Meissner, M. Neuner, T. Nikodem, M. Schmelling, P. Seyfert, M. Stahl, U. Uwer, M. Vesterinen, C. Voß, R. Waldi, S. Wandernoth, D. Wiedner, A. Zhelezov [und 671 weitere] Gesehen am 27.07.2021 |
| Beschreibung: | Online Resource |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-015-3502-x |