Study of the lineshape of the χc1 (3872) state

LHCb Collaboration

doi:10.1103/PhysRevD.102.092005

Study of the lineshape of the χc1 (3872) state

LHCb Collaboration

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb-1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π- decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068 MeV,ΓBW=1.39±0.24±0.10 MeV, where the first uncertainty is statistical and the second systematic. Using a Flatté-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69-0.04-0.13+0.00+0.05 MeV,FWHM=0.22-0.06-0.13+0.07+0.11 MeV. An investigation of the analytic structure of the Flatté amplitude reveals a pole structure, which is compatible with a quasibound D0D¯∗0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.

Original language	English
Article number	092005
Journal	Physical Review D
Volume	102
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevD.102.092005
Publication status	Published - 12 Nov 2020

Bibliographical note

Funding Information:
We thank C. Hanhart and A. Pilloni for useful discussions on the Flatté model and the analytic structure of the amplitude. We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany), EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union), ANR, Labex P2IO and OCEVU, and Région Auvergne-Rhône-Alpes (France), RFBR, RSF and Yandex LLC (Russia), GVA, XuntaGal and GENCAT (Spain), Herchel Smith Fund, the Royal Society, the English-Speaking Union and the Leverhulme Trust (United Kingdom).

Publisher Copyright:
© 2020 CERN.

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1103/PhysRevD.102.092005Licence: Creative Commons: Attribution (CC BY)

Cite this

@article{ccb8242a52a3497e9283400a44d03ae7,

title = "Study of the lineshape of the χc1 (3872) state",

abstract = "A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb-1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π- decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068 MeV,ΓBW=1.39±0.24±0.10 MeV, where the first uncertainty is statistical and the second systematic. Using a Flatt{\'e}-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69-0.04-0.13+0.00+0.05 MeV,FWHM=0.22-0.06-0.13+0.07+0.11 MeV. An investigation of the analytic structure of the Flatt{\'e} amplitude reveals a pole structure, which is compatible with a quasibound D0D¯∗0 state but a quasivirtual state is still allowed at the level of 2 standard deviations. ",

author = "{LHCb Collaboration} and R. Aaij and {Abell{\'a}n Beteta}, C. and T. Ackernley and B. Adeva and M. Adinolfi and H. Afsharnia and Aidala, {C. A.} and S. Aiola and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and M. Alexander and {Alfonso Albero}, A. and Z. Aliouche and G. Alkhazov and {Alvarez Cartelle}, P. and Alves, {Jr A.} and S. Amato and Y. Amhis and L. An and L. Anderlini and G. Andreassi and A. Andreianov and M. Andreotti and F. Archilli and A. Artamonov and M. Artuso and K. Arzymatov and E. Aslanides and M. Atzeni and B. Audurier and S. Bachmann and M. Bachmayer and Back, {J. J.} and S. Bifani and R. Calladine and G. Chatzikonstantinidis and N. Cooke and N. Farley and P. Griffith and P. Ilten and Parkinson, {C. J.} and J. Plews and D. Popov and A. Sergi and Slater, {M. W.} and Swallow, {P. N.} and Watson, {N. K.} and Zarebski, {K. A.}",

note = "Funding Information: We thank C. Hanhart and A. Pilloni for useful discussions on the Flatt{\'e} model and the analytic structure of the amplitude. We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany), EPLANET, Marie Sk{\l}odowska-Curie Actions and ERC (European Union), ANR, Labex P2IO and OCEVU, and R{\'e}gion Auvergne-Rh{\^o}ne-Alpes (France), RFBR, RSF and Yandex LLC (Russia), GVA, XuntaGal and GENCAT (Spain), Herchel Smith Fund, the Royal Society, the English-Speaking Union and the Leverhulme Trust (United Kingdom). Publisher Copyright: {\textcopyright} 2020 CERN. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

year = "2020",

month = nov,

day = "12",

doi = "10.1103/PhysRevD.102.092005",

language = "English",

volume = "102",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society (APS)",

number = "9",

}

TY - JOUR

T1 - Study of the lineshape of the χc1 (3872) state

AU - LHCb Collaboration

AU - Aaij, R.

AU - Abellán Beteta, C.

AU - Ackernley, T.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Afsharnia, H.

AU - Aidala, C. A.

AU - Aiola, S.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Alfonso Albero, A.

AU - Aliouche, Z.

AU - Alkhazov, G.

AU - Alvarez Cartelle, P.

AU - Alves, Jr A.

AU - Amato, S.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andreassi, G.

AU - Andreianov, A.

AU - Andreotti, M.

AU - Archilli, F.

AU - Artamonov, A.

AU - Artuso, M.

AU - Arzymatov, K.

AU - Aslanides, E.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Bifani, S.

AU - Calladine, R.

AU - Chatzikonstantinidis, G.

AU - Cooke, N.

AU - Farley, N.

AU - Griffith, P.

AU - Ilten, P.

AU - Parkinson, C. J.

AU - Plews, J.

AU - Popov, D.

AU - Sergi, A.

AU - Slater, M. W.

AU - Swallow, P. N.

AU - Watson, N. K.

AU - Zarebski, K. A.

N1 - Funding Information: We thank C. Hanhart and A. Pilloni for useful discussions on the Flatté model and the analytic structure of the amplitude. We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FASO (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (USA). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (USA). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany), EPLANET, Marie Skłodowska-Curie Actions and ERC (European Union), ANR, Labex P2IO and OCEVU, and Région Auvergne-Rhône-Alpes (France), RFBR, RSF and Yandex LLC (Russia), GVA, XuntaGal and GENCAT (Spain), Herchel Smith Fund, the Royal Society, the English-Speaking Union and the Leverhulme Trust (United Kingdom). Publisher Copyright: © 2020 CERN. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/11/12

Y1 - 2020/11/12

N2 - A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb-1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π- decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068 MeV,ΓBW=1.39±0.24±0.10 MeV, where the first uncertainty is statistical and the second systematic. Using a Flatté-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69-0.04-0.13+0.00+0.05 MeV,FWHM=0.22-0.06-0.13+0.07+0.11 MeV. An investigation of the analytic structure of the Flatté amplitude reveals a pole structure, which is compatible with a quasibound D0D¯∗0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.

AB - A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb-1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π- decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068 MeV,ΓBW=1.39±0.24±0.10 MeV, where the first uncertainty is statistical and the second systematic. Using a Flatté-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69-0.04-0.13+0.00+0.05 MeV,FWHM=0.22-0.06-0.13+0.07+0.11 MeV. An investigation of the analytic structure of the Flatté amplitude reveals a pole structure, which is compatible with a quasibound D0D¯∗0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.

UR - http://www.scopus.com/inward/record.url?scp=85097136842&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.102.092005

DO - 10.1103/PhysRevD.102.092005

M3 - Article

AN - SCOPUS:85097136842

SN - 2470-0010

VL - 102

JO - Physical Review D

JF - Physical Review D

IS - 9

M1 - 092005

ER -

Study of the lineshape of the χc1 (3872) state

Abstract

Bibliographical note

ASJC Scopus subject areas

Access to Document

Fingerprint

Cite this