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Evidence for an [eta] c(1S) π - resonance in B0→[eta] c(1S)K+ π - decays

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A Dalitz plot analysis of B0→ηc(1S)K+π−B0→ηc(1S)K+π−{{B} ^0} \!\rightarrow \eta _c(1S) {{K} ^+} {{\pi } ^-} decays is performed using data samples of pp collisions collected with the LHCb LHCb \text{ LHCb } detector at centre-of-mass energies of s√=7, 8s=7, 8{\sqrt{s}} =7,~8 and 13TeV13TeV13{\,\math...

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Main Authors: Aaij, Roel (Author) , D'Argent, Philippe (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Braun, Svende (Author) , Comerma-Montells, Albert (Author) , De Cian, Michel (Author) , Dziewiecki, Michal (Author) , Gerick, David (Author) , Grabowski, Jascha (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Kecke, Matthieu (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Mitzel, Dominik (Author) , Neubert, Sebastian (Author) , Piucci, Alessio (Author) , Skidmore, Nicola (Author) , Stahl, Marian (Author) , Stemmle, Simon (Author) , Uwer, Ulrich (Author) , Zhelezov, Alexey (Author) , Tilburg, Jeroen van (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 17 December 2018
In: The European physical journal. C, Particles and fields
Year: 2018, Volume: 78, Issue: 12
ISSN:1434-6052
DOI:10.1140/epjc/s10052-018-6447-z
Online Access:Verlag, Volltext: https://doi.org/10.1140/epjc/s10052-018-6447-z
Verlag, Volltext: https://link.springer.com/content/pdf/10.1140%2Fepjc%2Fs10052-018-6447-z.pdf
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Author Notes:LHCb Collaboration*
Description
Summary:A Dalitz plot analysis of B0→ηc(1S)K+π−B0→ηc(1S)K+π−{{B} ^0} \!\rightarrow \eta _c(1S) {{K} ^+} {{\pi } ^-} decays is performed using data samples of pp collisions collected with the LHCb LHCb \text{ LHCb } detector at centre-of-mass energies of s√=7, 8s=7, 8{\sqrt{s}} =7,~8 and 13TeV13TeV13{\,\mathrm {Te}\mathrm {V}} , corresponding to a total integrated luminosity of 4.7 fb −14.7 fb −14.7 \,\text{ fb }^{-1} . A satisfactory description of the data is obtained when including a contribution representing an exotic ηc(1S)π−ηc(1S)π−\eta _c(1S) \pi ^- resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are 4096±20 +18−22MeV4096±20 −22+18MeV4096 \pm 20~^{+18}_{-22} \,\mathrm {Me}\mathrm {V} and 152±58 +60−35MeV152±58 −35+60MeV152 \pm 58~^{+60}_{-35} \,\mathrm {Me}\mathrm {V} , respectively. The spin-parity assignments JP=0+JP=0+J^P=0^+ and JP=1−JP=1−J^{P}=1^- are both consistent with the data. In addition, the first measurement of the B0→ηc(1S)K+π−B0→ηc(1S)K+π−{{B} ^0} \!\rightarrow \eta _c(1S) {{K} ^+} {{\pi } ^-} branching fraction is performed and gives B(B0→ηc(1S)K+π−)=(5.73±0.24±0.13±0.66)×10−4,B(B0→ηc(1S)K+π−)=(5.73±0.24±0.13±0.66)×10−4,\begin{aligned} \displaystyle \mathcal {B}({{B} ^0} \!\rightarrow \eta _c(1S) {{K} ^+} {{\pi } ^-} ) = (5.73 \pm 0.24 \pm 0.13 \pm 0.66) \times 10^{-4}, \end{aligned}where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions.
Item Description:Im Titel sind "+", "-" und "0" hochgestellt, "c" ist tiefgestellt
Im Titel ist "eta" als griechischer Buchstabe dargestellt
LHCb Collaboration: R. Aaij, P. d'Argent, S. Bachmann, D. Berninghoff, S. Braun, A. Comerma-Montells, M. De Cian, M. Dziewiecki, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, R. Kopecna, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, A. Piucci, M. Stahl, S. Stemmle, J. van Tilburg, U. Uwer, A. Zhelezov [und weitere]
Gesehen am 12.06.2019
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-018-6447-z

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