Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

ATLAS Collaboration

doi:10.1103/PhysRevLett.131.151902

Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

ATLAS Collaboration

Research output: Contribution to journal › Review article › peer-review

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Abstract

A search is made for potential ccc̄ c̄ tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at √s = 13 TeV, corresponding to an integrated luminosity of 140 fb⁻¹ recorded by the ATLAS experiment at LHC. Two decay channels, J/ψ + J/ψ → 4μ and J/ψ + ψ(2S) → 4μ, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J=ψ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the J/ψ + ψ(2S) channel. The fitted masses and decay widths of the structures are reported.

Original language	English
Article number	151902
Pages (from-to)	151902-1-151902-22
Number of pages	22
Journal	Physical Review Letters
Volume	131
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.131.151902
Publication status	Published - 13 Oct 2023
Externally published	Yes

Bibliographical note

Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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10.1103/PhysRevLett.131.151902Licence: CC BY

Publisher version (open access)Final published version, 49 MBLicence: CC BY

Cite this

@article{a25880d892b34071a80e73f5df4a189f,

title = "Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector",

abstract = "A search is made for potential cc{\=c} {\=c} tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at √s = 13 TeV, corresponding to an integrated luminosity of 140 fb−1 recorded by the ATLAS experiment at LHC. Two decay channels, J/ψ + J/ψ → 4μ and J/ψ + ψ(2S) → 4μ, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J=ψ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the J/ψ + ψ(2S) channel. The fitted masses and decay widths of the structures are reported.",

author = "{ATLAS Collaboration} and G. Aad and B. Abbott and Abbott, {D. C.} and {Abed Abud}, A. and K. Abeling and Abhayasinghe, {D. K.} and Abidi, {S. H.} and AbouZeid, {O. S.} and Abraham, {N. L.} and H. Abramowicz and H. Abreu and R. Abreu and Y. Abulaiti and Acharya, {B. S.} and B. Achkar and L. Adam and {Adam Bourdarios}, C. and L. Adamczyk and L. Adamek and J. Adelman and M. Adersberger and A. Adiguzel and S. Adorni and T. Adye and Affolder, {A. A.} and Y. Afik and C. Agapopoulou and Agaras, {M. N.} and A. Aggarwal and C. Agheorghiesei and Aguilar-Saavedra, {J. A.} and A. Ahmad and F. Ahmadov and Ahmed, {W. S.} and X. Ai and G. Aielli and S. Akatsuka and M. Akbiyik and {\AA}kesson, {T. P.A.} and E. Akilli and Akimov, {A. V.} and {Al Khoury}, K. and Alberghi, {G. L.} and J. Albert and {Alconada Verzini}, {M. J.} and S. Alderweireldt and M. Aleksa and Aleksandrov, {I. N.} and C. Alexa and T. Alexopoulos and A. Alfonsi and F. Alfonsi and M. Alhroob and B. Ali and S. Ali and M. Aliev and G. Alimonti and C. Allaire and Allbrooke, {B. M.M.} and Allen, {B. W.} and Allport, {P. P.} and A. Aloisio and F. Alonso and C. Alpigiani and {Alunno Camelia}, E. and {Alvarez Estevez}, M. and Alviggi, {M. G.} and {Amaral Coutinho}, Y. and A. Ambler and L. Ambroz and C. Amelung and D. Amidei and {Amor Dos Santos}, {S. P.} and S. Amoroso and Amrouche, {C. S.} and F. An and C. Anastopoulos and N. Andari and T. Andeen and Anders, {J. K.} and Andrean, {S. Y.} and A. Andreazza and V. Andrei and Anelli, {C. R.} and S. Angelidakis and A. Angerami and Anisenkov, {A. V.} and A. Annovi and C. Antel and Anthony, {M. T.} and E. Antipov and M. Antonelli and Antrim, {D. J.A.} and F. Anulli and M. Aoki and {Aparisi Pozo}, {J. A.} and Aparo, {M. A.} and {Aperio Bella}, L. and {Aranzabal Barrio}, N. and {Araujo Ferraz}, V. and {Araujo Pereira}, R. and C. Arcangeletti and Arce, {A. T.H.} and Arduh, {F. A.} and Arguin, {J. F.} and S. Argyropoulos and Arling, {J. H.} and Armbruster, {A. J.} and A. Armstrong and O. Arnaez and H. Arnold and {Arrubarrena Tame}, {Z. P.} and G. Artoni and H. Asada and K. Asai and S. Asai and T. Asawatavonvanich and N. Asbah and Asimakopoulou, {E. M.} and L. Asquith and J. Assahsah and K. Assamagan and R. Astalos and Atkin, {R. J.} and M. Atkinson and Atlay, {N. B.} and H. Atmani and K. Augsten and Aukerman, {A. T.} and Austrup, {V. A.} and G. Avolio and Ayoub, {M. K.} and G. Azuelos and H. Bachacou and K. Bachas and M. Backes and F. Backman and P. Bagnaia and M. Bahmani and H. Bahrasemani and Bailey, {A. J.} and Bailey, {V. R.} and Baines, {J. T.} and C. Bakalis and Baker, {O. K.} and Bakker, {P. J.} and E. Bakos and {Bakshi Gupta}, D. and S. Balaji and R. Balasubramanian and Baldin, {E. M.} and P. Balek and F. Balli and Balunas, {W. K.} and J. Balz and E. Banas and M. Bandieramonte and A. Bandyopadhyay and Banerjee, {S. W.} and L. Barak and Barbe, {W. M.} and Barberio, {E. L.} and D. Barberis and M. Barbero and G. Barbour and T. Barillari and Barisits, {M. S.} and J. Barkeloo and T. Barklow and R. Barnea and Barnett, {B. M.} and Barnett, {R. M.} and Z. Barnovska-Blenessy and A. Baroncelli and G. Barone and Barr, {A. J.} and {Barranco Navarro}, L. and F. Barreiro and {Barreiro Guimar{\~a}es da Costa}, J. and U. Barron and S. Barsov and F. Bartels and R. Bartoldus and G. Bartolini and Barton, {A. E.} and P. Bartos and A. Basalaev and A. Basan and A. Bassalat and Basso, {M. J.} and Bates, {R. L.} and S. Batlamous and Batley, {J. R.} and B. Batool and M. Battaglia and M. Bauce and F. Bauer and P. Bauer and Bawa, {H. S.} and A. Bayirli and Beacham, {J. B.} and T. Beau and Beauchemin, {P. H.} and F. Becherer and P. Bechtle and Beck, {H. C.} and Beck, {H. P.} and K. Becker and C. Becot and Beddall, {A. J.} and Beddall, {A. J.} and Bednyakov, {V. A.} and M. Bedognetti and Bee, {C. P.} and Beermann, {T. A.} and M. Begalli and M. Begel and A. Behera and Behr, {J. K.} and F. Beisiegel and M. Belfkir and Bell, {A. S.} and G. Bella and L. Bellagamba and A. Bellerive and P. Bellos and K. Beloborodov and K. Belotskiy and Belyaev, {N. L.} and D. Benchekroun and N. Benekos and Y. Benhammou and Benjamin, {D. P.} and M. Benoit and Bensinger, {J. R.} and S. Bentvelsen and L. Beresford and M. Beretta and D. Berge and {Bergeaas Kuutmann}, E. and N. Berger and B. Bergmann and Bergsten, {L. J.} and J. Beringer and S. Berlendis and G. Bernardi and C. Bernius and Bernlochner, {F. U.} and T. Berry and J. Shojaii",

note = "Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2023",

month = oct,

day = "13",

doi = "10.1103/PhysRevLett.131.151902",

language = "English",

volume = "131",

pages = "151902--1--151902--22",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "15",

}

TY - JOUR

T1 - Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

AU - ATLAS Collaboration

AU - Aad, G.

AU - Abbott, B.

AU - Abbott, D. C.

AU - Abed Abud, A.

AU - Abeling, K.

AU - Abhayasinghe, D. K.

AU - Abidi, S. H.

AU - AbouZeid, O. S.

AU - Abraham, N. L.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Achkar, B.

AU - Adam, L.

AU - Adam Bourdarios, C.

AU - Adamczyk, L.

AU - Adamek, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adorni, S.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agapopoulou, C.

AU - Agaras, M. N.

AU - Aggarwal, A.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahmad, A.

AU - Ahmadov, F.

AU - Ahmed, W. S.

AU - Ai, X.

AU - Aielli, G.

AU - Akatsuka, S.

AU - Akbiyik, M.

AU - Åkesson, T. P.A.

AU - Akilli, E.

AU - Akimov, A. V.

AU - Al Khoury, K.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Alconada Verzini, M. J.

AU - Alderweireldt, S.

AU - Aleksa, M.

AU - Aleksandrov, I. N.

AU - Alexa, C.

AU - Alexopoulos, T.

AU - Alfonsi, A.

AU - Alfonsi, F.

AU - Alhroob, M.

AU - Ali, B.

AU - Ali, S.

AU - Aliev, M.

AU - Alimonti, G.

AU - Allaire, C.

AU - Allbrooke, B. M.M.

AU - Allen, B. W.

AU - Allport, P. P.

AU - Aloisio, A.

AU - Alonso, F.

AU - Alpigiani, C.

AU - Alunno Camelia, E.

AU - Alvarez Estevez, M.

AU - Alviggi, M. G.

AU - Amaral Coutinho, Y.

AU - Ambler, A.

AU - Ambroz, L.

AU - Amelung, C.

AU - Amidei, D.

AU - Amor Dos Santos, S. P.

AU - Amoroso, S.

AU - Amrouche, C. S.

AU - An, F.

AU - Anastopoulos, C.

AU - Andari, N.

AU - Andeen, T.

AU - Anders, J. K.

AU - Andrean, S. Y.

AU - Andreazza, A.

AU - Andrei, V.

AU - Anelli, C. R.

AU - Angelidakis, S.

AU - Angerami, A.

AU - Anisenkov, A. V.

AU - Annovi, A.

AU - Antel, C.

AU - Anthony, M. T.

AU - Antipov, E.

AU - Antonelli, M.

AU - Antrim, D. J.A.

AU - Anulli, F.

AU - Aoki, M.

AU - Aparisi Pozo, J. A.

AU - Aparo, M. A.

AU - Aperio Bella, L.

AU - Aranzabal Barrio, N.

AU - Araujo Ferraz, V.

AU - Araujo Pereira, R.

AU - Arcangeletti, C.

AU - Arce, A. T.H.

AU - Arduh, F. A.

AU - Arguin, J. F.

AU - Argyropoulos, S.

AU - Arling, J. H.

AU - Armbruster, A. J.

AU - Armstrong, A.

AU - Arnaez, O.

AU - Arnold, H.

AU - Arrubarrena Tame, Z. P.

AU - Artoni, G.

AU - Asada, H.

AU - Asai, K.

AU - Asai, S.

AU - Asawatavonvanich, T.

AU - Asbah, N.

AU - Asimakopoulou, E. M.

AU - Asquith, L.

AU - Assahsah, J.

AU - Assamagan, K.

AU - Astalos, R.

AU - Atkin, R. J.

AU - Atkinson, M.

AU - Atlay, N. B.

AU - Atmani, H.

AU - Augsten, K.

AU - Aukerman, A. T.

AU - Austrup, V. A.

AU - Avolio, G.

AU - Ayoub, M. K.

AU - Azuelos, G.

AU - Bachacou, H.

AU - Bachas, K.

AU - Backes, M.

AU - Backman, F.

AU - Bagnaia, P.

AU - Bahmani, M.

AU - Bahrasemani, H.

AU - Bailey, A. J.

AU - Bailey, V. R.

AU - Baines, J. T.

AU - Bakalis, C.

AU - Baker, O. K.

AU - Bakker, P. J.

AU - Bakos, E.

AU - Bakshi Gupta, D.

AU - Balaji, S.

AU - Balasubramanian, R.

AU - Baldin, E. M.

AU - Balek, P.

AU - Balli, F.

AU - Balunas, W. K.

AU - Balz, J.

AU - Banas, E.

AU - Bandieramonte, M.

AU - Bandyopadhyay, A.

AU - Banerjee, S. W.

AU - Barak, L.

AU - Barbe, W. M.

AU - Barberio, E. L.

AU - Barberis, D.

AU - Barbero, M.

AU - Barbour, G.

AU - Barillari, T.

AU - Barisits, M. S.

AU - Barkeloo, J.

AU - Barklow, T.

AU - Barnea, R.

AU - Barnett, B. M.

AU - Barnett, R. M.

AU - Barnovska-Blenessy, Z.

AU - Baroncelli, A.

AU - Barone, G.

AU - Barr, A. J.

AU - Barranco Navarro, L.

AU - Barreiro, F.

AU - Barreiro Guimarães da Costa, J.

AU - Barron, U.

AU - Barsov, S.

AU - Bartels, F.

AU - Bartoldus, R.

AU - Bartolini, G.

AU - Barton, A. E.

AU - Bartos, P.

AU - Basalaev, A.

AU - Basan, A.

AU - Bassalat, A.

AU - Basso, M. J.

AU - Bates, R. L.

AU - Batlamous, S.

AU - Batley, J. R.

AU - Batool, B.

AU - Battaglia, M.

AU - Bauce, M.

AU - Bauer, F.

AU - Bauer, P.

AU - Bawa, H. S.

AU - Bayirli, A.

AU - Beacham, J. B.

AU - Beau, T.

AU - Beauchemin, P. H.

AU - Becherer, F.

AU - Bechtle, P.

AU - Beck, H. C.

AU - Beck, H. P.

AU - Becker, K.

AU - Becot, C.

AU - Beddall, A. J.

AU - Bednyakov, V. A.

AU - Bedognetti, M.

AU - Bee, C. P.

AU - Beermann, T. A.

AU - Begalli, M.

AU - Begel, M.

AU - Behera, A.

AU - Behr, J. K.

AU - Beisiegel, F.

AU - Belfkir, M.

AU - Bell, A. S.

AU - Bella, G.

AU - Bellagamba, L.

AU - Bellerive, A.

AU - Bellos, P.

AU - Beloborodov, K.

AU - Belotskiy, K.

AU - Belyaev, N. L.

AU - Benchekroun, D.

AU - Benekos, N.

AU - Benhammou, Y.

AU - Benjamin, D. P.

AU - Benoit, M.

AU - Bensinger, J. R.

AU - Bentvelsen, S.

AU - Beresford, L.

AU - Beretta, M.

AU - Berge, D.

AU - Bergeaas Kuutmann, E.

AU - Berger, N.

AU - Bergmann, B.

AU - Bergsten, L. J.

AU - Beringer, J.

AU - Berlendis, S.

AU - Bernardi, G.

AU - Bernius, C.

AU - Bernlochner, F. U.

AU - Berry, T.

AU - Shojaii, J.

N1 - Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2023/10/13

Y1 - 2023/10/13

N2 - A search is made for potential ccc̄ c̄ tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at √s = 13 TeV, corresponding to an integrated luminosity of 140 fb−1 recorded by the ATLAS experiment at LHC. Two decay channels, J/ψ + J/ψ → 4μ and J/ψ + ψ(2S) → 4μ, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J=ψ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the J/ψ + ψ(2S) channel. The fitted masses and decay widths of the structures are reported.

AB - A search is made for potential ccc̄ c̄ tetraquarks decaying into a pair of charmonium states in the four ffiffi muon final state using proton-proton collision data at √s = 13 TeV, corresponding to an integrated luminosity of 140 fb−1 recorded by the ATLAS experiment at LHC. Two decay channels, J/ψ + J/ψ → 4μ and J/ψ + ψ(2S) → 4μ, are studied. Backgrounds are estimated based on a hybrid approach involving Monte Carlo simulations and data-driven methods. Statistically significant excesses with respect to backgrounds dominated by the single parton scattering are seen in the di-J=ψ channel consistent with a narrow resonance at 6.9 GeV and a broader structure at lower mass. A statistically significant excess is also seen in the J/ψ + ψ(2S) channel. The fitted masses and decay widths of the structures are reported.

UR - http://www.scopus.com/inward/record.url?scp=85175279527&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.131.151902

DO - 10.1103/PhysRevLett.131.151902

M3 - Review article

C2 - 37897770

AN - SCOPUS:85175279527

SN - 0031-9007

VL - 131

SP - 151902-1-151902-22

JO - Physical Review Letters

JF - Physical Review Letters

IS - 15

M1 - 151902

ER -

Observation of an excess of dicharmonium events in the four-muon final state with the ATLAS detector

Abstract

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