Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV

CMS Collaboration; Freya Blekman; Emil Sørensen Bols; Simranjit Singh Chhibra; Jorgen D'Hondt; Jarne De Clercq; Giannis Flouris; Denys Lontkovskyi; Steven Lowette; Ivan Marchesini; Seth Moortgat; Lieselotte Moreels; Quentin Python; Kirill Skovpen; Stefaan Tavernier; Walter Van Doninck; Petra Van Mulders; Isis Marina Van Parijs; Douglas Burns

doi:10.1103/PhysRevLett.122.132001

Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV

CMS Collaboration, Freya Blekman, Emil Sørensen Bols, Simranjit Singh Chhibra, Jorgen D'Hondt, Jarne De Clercq, Giannis Flouris, Denys Lontkovskyi, Steven Lowette, Ivan Marchesini, Seth Moortgat, Lieselotte Moreels, Quentin Python, Kirill Skovpen, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders, Isis Marina Van Parijs, Douglas Burns

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Abstract

Signals consistent with the Bc+(2S) and Bc∗+(2S) states are observed in proton-proton collisions at s=13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb-1, collected by the CMS experiment during the 2015-2018 LHC running periods. These excited bc states are observed in the Bc+π+π- invariant mass spectrum, with the ground state Bc+ reconstructed through its decay to J/ψπ+. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1±1.5(stat)±0.7(syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the Bc+(2S) meson is measured to be 6871.0±1.2(stat)±0.8(syst)±0.8(Bc+) MeV, where the last term corresponds to the uncertainty in the world-average Bc+ mass.

Original language	English
Article number	132001
Number of pages	17
Journal	Phys. Rev. Lett.
Volume	122
Issue number	13
DOIs	https://doi.org/10.1103/PhysRevLett.122.132001
Publication status	Published - 2 Apr 2019

Bibliographical note

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-18-007 (CMS Public Pages)

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hep-ex

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Collaboration, CMS., Blekman, F., Bols, E. S., Chhibra, S. S., D'Hondt, J., De Clercq, J., Flouris, G., Lontkovskyi, D., Lowette, S., Marchesini, I., Moortgat, S., Moreels, L., Python, Q., Skovpen, K., Tavernier, S., Van Doninck, W., Van Mulders, P., Van Parijs, I. M., & Burns, D. (2019). Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV. Phys. Rev. Lett., 122(13), Article 132001. https://doi.org/10.1103/PhysRevLett.122.132001

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title = "Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV",

abstract = "Signals consistent with the Bc+(2S) and Bc∗+(2S) states are observed in proton-proton collisions at s=13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb-1, collected by the CMS experiment during the 2015-2018 LHC running periods. These excited bc states are observed in the Bc+π+π- invariant mass spectrum, with the ground state Bc+ reconstructed through its decay to J/ψπ+. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1±1.5(stat)±0.7(syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the Bc+(2S) meson is measured to be 6871.0±1.2(stat)±0.8(syst)±0.8(Bc+) MeV, where the last term corresponds to the uncertainty in the world-average Bc+ mass.",

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author = "CMS Collaboration and Freya Blekman and Bols, {Emil S{\o}rensen} and Chhibra, {Simranjit Singh} and Jorgen D'Hondt and {De Clercq}, Jarne and Giannis Flouris and Denys Lontkovskyi and Steven Lowette and Ivan Marchesini and Seth Moortgat and Lieselotte Moreels and Quentin Python and Kirill Skovpen and Stefaan Tavernier and {Van Doninck}, Walter and {Van Mulders}, Petra and {Van Parijs}, {Isis Marina} and Douglas Burns",

note = "Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-18-007 (CMS Public Pages)",

year = "2019",

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doi = "10.1103/PhysRevLett.122.132001",

language = "English",

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Collaboration, CMS, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Flouris, G, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, IM & Burns, D 2019, 'Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV', Phys. Rev. Lett., vol. 122, no. 13, 132001. https://doi.org/10.1103/PhysRevLett.122.132001

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T1 - Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV

AU - Collaboration, CMS

AU - Blekman, Freya

AU - Bols, Emil Sørensen

AU - Chhibra, Simranjit Singh

AU - D'Hondt, Jorgen

AU - De Clercq, Jarne

AU - Flouris, Giannis

AU - Lontkovskyi, Denys

AU - Lowette, Steven

AU - Marchesini, Ivan

AU - Moortgat, Seth

AU - Moreels, Lieselotte

AU - Python, Quentin

AU - Skovpen, Kirill

AU - Tavernier, Stefaan

AU - Van Doninck, Walter

AU - Van Mulders, Petra

AU - Van Parijs, Isis Marina

AU - Burns, Douglas

N1 - Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-18-007 (CMS Public Pages)

PY - 2019/4/2

Y1 - 2019/4/2

N2 - Signals consistent with the Bc+(2S) and Bc∗+(2S) states are observed in proton-proton collisions at s=13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb-1, collected by the CMS experiment during the 2015-2018 LHC running periods. These excited bc states are observed in the Bc+π+π- invariant mass spectrum, with the ground state Bc+ reconstructed through its decay to J/ψπ+. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1±1.5(stat)±0.7(syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the Bc+(2S) meson is measured to be 6871.0±1.2(stat)±0.8(syst)±0.8(Bc+) MeV, where the last term corresponds to the uncertainty in the world-average Bc+ mass.

AB - Signals consistent with the Bc+(2S) and Bc∗+(2S) states are observed in proton-proton collisions at s=13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb-1, collected by the CMS experiment during the 2015-2018 LHC running periods. These excited bc states are observed in the Bc+π+π- invariant mass spectrum, with the ground state Bc+ reconstructed through its decay to J/ψπ+. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1±1.5(stat)±0.7(syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the Bc+(2S) meson is measured to be 6871.0±1.2(stat)±0.8(syst)±0.8(Bc+) MeV, where the last term corresponds to the uncertainty in the world-average Bc+ mass.

KW - hep-ex

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U2 - 10.1103/PhysRevLett.122.132001

DO - 10.1103/PhysRevLett.122.132001

M3 - Article

SN - 0031-9007

VL - 122

JO - Phys. Rev. Lett.

JF - Phys. Rev. Lett.

IS - 13

M1 - 132001

ER -

Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV

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SRP8: Strategic Research Programme: High-Energy Physics at the VUB

Observation of Two Excited B$^+_\mathrm{c}$ States and Measurement of the B$^+_\mathrm{c}$(2S) Mass in pp Collisions at $\sqrt{s} =$ 13 TeV

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Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV

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SRP8: Strategic Research Programme: High-Energy Physics at the VUB

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Observation of Two Excited B$^+_\mathrm{c}$ States and Measurement of the B$^+_\mathrm{c}$(2S) Mass in pp Collisions at $\sqrt{s} =$ 13 TeV

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