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Observation of New Resonances in the Λb0 π+π- System(Open Access)

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成果类型:
期刊论文
作者:
Aaij, R.*;Beteta, C. Abellan;Ackernley, T.;Adeva, B.;Adinolfi, M.;...
通讯作者:
Aaij, R.
作者机构:
[Ketel, T.; Mulder, M.; Tuning, N.; Hynds, D.; van Tilburg, J.; Hart, R.; Kuindersma, H. S.; de Vries, J. A.; Heijhoff, K.; Veronesi, M.; Aaij, R.; Greim, R.; van Beuzekom, M.; Martinez, M. Lucio; Kostiuk, I; Jans, E.; Bel, L. J.; Esen, S.; Dall'Occo, E.; Pellegrino, A.; Vitkovskiy, A.; Merk, M.; Onderwater, C. J. G.; van Veghel, M.; Butter, J. S.; Koppenburg, P.; Gras, C. Sanchez; Raven, G.; Sole, S. Ferreres; Sierra, C. Vazquez; Govorkova, E.; Schubiger, M.; Benson, S.; Hulsbergen, W.] Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.
[Massafferri, A.; Cruz Torres, M.; De Miranda, J. M.; Soares Lavra, I; Gomes, A.; dos Reis, A. C.; Bediaga, I] CBPF, Rio De Janeiro, Brazil.
[Lopes, J. H.; Polycarpo, E.; Souza De Paula, B.; Gandelman, M.; Gobel, C.; Rangel, M. S.; Ferreira Rodrigues, F.; Hicheur, A.; Nasteva, I; Sellam, S.; Otalora Goicochea, J. M.; Carvalho Akiba, K.; Silva de Oliveira, L.; De Paula, L.; Amato, S.] Univ Fed Rio de Janeiro, Rio de Janeiro, Brazil.
[Gao, Y.; Yang, Z.; Cai, H.; Zhang, S.; Jiang, F.; Fan, J.; Xu, A.; Liu, G.; Ren, Z.; Xu, L.; Tang, Z.; Li, H.; Wang, J.; Xu, Z.; Wang, M.; Zhang, W. C.; Gu, C.; Sun, J.; Xing, H.; Chen, C.; Zhu, X.; Sun, L.; Luo, Y.; Mu, H.; Zeng, M.; Zhang, L.; Gan, Y.; Liu, X.] Tsinghua Univ, Ctr High Energy Phys, Beijing, Peoples R China.
[Zhou, X.; Beliy, N.; Zhou, Y.; Li, P-R; Lyu, X.; Szymanski, M.; Xu, Q.; Huang, W.; He, J.; Saur, M.; Qian, W.; Qin, J.; Zheng, Y.; Xiang, Z.; Vieira, D.] Univ Chinese Acad Sci, Beijing, Peoples R China.
通讯机构:
[Aaij, R.] N
Nikhef Natl Inst Subat Phys, Amsterdam, Netherlands.
语种:
英文
期刊:
PHYSICAL REVIEW LETTERS
ISSN:
0031-9007
年:
2019
卷:
123
期:
15
页码:
152001
基金类别:
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); MSHE (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); DOE NP and 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); Key Research Program of Frontier Sciences of CAS, CAS PIFI, and the Thousand Talents Program (China); RFBR, RSF and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Royal Society and the Leverhulme Trust (United Kingdom).
机构署名:
本校为其他机构
院系归属:
物理科学与技术学院
摘要:
We report the observation of a new structure in the Λb0π+π- spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9 fb-1, collected at s=7, 8, and 13 TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be mΛb(6146)0=6146.17±0.33±0.22±0.16 MeV,mΛb(6152)0=6152.51±0.26±0.22±0.16 MeV,ΓΛb(6146)0=2.9±1.3±0.3 MeV,ΓΛb(6152)0=2.1&pl...

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