Abstract
The recent discovery, by the LHCb collaboration, of the Ξ + + cc doubly charmed baryon, has renewed interest in the spectroscopy of doubly heavy hadrons. Experimentally, however, searches for such states appear highly challenging. The reconstructed final states tend to involve multiple heavy flavoured (beauty or charm) hadrons, so the yield for any exclusive decay mode will be suppressed to unobservably low levels by the product of several branching fractions, each of which is typically 10−3–10−2. Noting that decays of double beauty hadrons are the only possible source of B − c mesons that are displaced from the primary vertices of proton-proton collisions at the LHC, a more promising inclusive search strategy is proposed.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
LHCb collaboration, Observation of the doubly charmed baryon Ξ + + cc , Phys. Rev. Lett. 119 (2017) 112001 [arXiv:1707.01621] [INSPIRE].
LHCb collaboration, First observation of the doubly charmed baryon decay Ξ + + cc → Ξ + c π +, Phys. Rev. Lett. 121 (2018) 162002 [arXiv:1807.01919] [INSPIRE].
LHCb collaboration, First measurement of the lifetime of the doubly charmed baryon Ξ + + cc , Phys. Rev. Lett. 121 (2018) 052002 [arXiv:1806.02744] [INSPIRE].
S.L. Olsen, T. Skwarnicki and D. Zieminska, Nonstandard heavy mesons and baryons: Experimental evidence, Rev. Mod. Phys. 90 (2018) 015003 [arXiv:1708.04012] [INSPIRE].
A. Ali, J.S. Lange and S. Stone, Exotics: Heavy Pentaquarks and Tetraquarks, Prog. Part. Nucl. Phys. 97 (2017) 123 [arXiv:1706.00610] [INSPIRE].
R.F. Lebed, R.E. Mitchell and E.S. Swanson, Heavy-Quark QCD Exotica, Prog. Part. Nucl. Phys. 93 (2017) 143 [arXiv:1610.04528] [INSPIRE].
J.P. Ader, J.M. Richard and P. Taxil, Do narrow heavy multi-quark states exist?, Phys. Rev. D 25 (1982) 2370 [INSPIRE].
A.V. Manohar and M.B. Wise, Exotic \( QQ\overline{q}\overline{q} \) states in QCD, Nucl. Phys. B 399 (1993) 17 [hep-ph/9212236] [INSPIRE].
P. Bicudo, K. Cichy, A. Peters, B. Wagenbach and M. Wagner, Evidence for the existence of \( ud\overline{b}\overline{b} \) and the non-existence of \( ss\overline{b}\overline{b} \) and \( cc\overline{b}\overline{b} \) tetraquarks from lattice QCD, Phys. Rev. D 92 (2015) 014507 [arXiv:1505.00613] [INSPIRE].
A. Francis, R.J. Hudspith, R. Lewis and K. Maltman, Lattice Prediction for Deeply Bound Doubly Heavy Tetraquarks, Phys. Rev. Lett. 118 (2017) 142001 [arXiv:1607.05214] [INSPIRE].
M. Karliner and J.L. Rosner, Discovery of doubly-charmed Ξcc baryon implies a stable \( bb\overline{u}\overline{d} \) tetraquark, Phys. Rev. Lett. 119 (2017) 202001 [arXiv:1707.07666] [INSPIRE].
E.J. Eichten and C. Quigg, Heavy-quark symmetry implies stable heavy tetraquark mesons \( {Q}_i{Q}_j{\overline{q}}_k{\overline{q}}_l \), Phys. Rev. Lett. 119 (2017) 202002 [arXiv:1707.09575] [INSPIRE].
A. Czarnecki, B. Leng and M.B. Voloshin, Stability of tetrons, Phys. Lett. B 778 (2018) 233 [arXiv:1708.04594] [INSPIRE].
V.V. Kiselev and A.K. Likhoded, Baryons with two heavy quarks, Phys. Usp. 45 (2002) 455 [hep-ph/0103169] [INSPIRE].
M. Karliner and J.L. Rosner, Baryons with two heavy quarks: Masses, production, decays and detection, Phys. Rev. D 90 (2014) 094007 [arXiv:1408.5877] [INSPIRE].
A.V. Berezhnoy, A.K. Likhoded and A.V. Luchinsky, Doubly heavy baryons at LHC, arXiv:1809.10058 [INSPIRE].
A. Ali, Q. Qin and W. Wang, Discovery potential of stable and near-threshold doubly heavy tetraquarks at the LHC, Phys. Lett. B 785 (2018) 605 [arXiv:1806.09288] [INSPIRE].
LHCb collaboration, The LHCb Detector at the LHC, 2008 JINST 3 S08005 [INSPIRE].
R. Aaij et al., Performance of the LHCb Vertex Locator, 2014 JINST 9 P09007 [arXiv:1405.7808] [INSPIRE].
C.-F. Qiao, P. Sun, D. Yang and R.-L. Zhu, B c exclusive decays to charmonium and a light meson at next-to-leading order accuracy, Phys. Rev. D 89 (2014) 034008 [arXiv:1209.5859] [INSPIRE].
LHCb collaboration, Measurement of B + c production in proton-proton collisions at \( \sqrt{s}=8 \) TeV, Phys. Rev. Lett. 114 (2015) 132001 [arXiv:1411.2943] [INSPIRE].
LHCb collaboration, Search for excited B + c states, JHEP 01 (2018) 138 [arXiv:1712.04094] [INSPIRE].
LHCb collaboration, First observation of decay B + c → J/ψπ + π − π +, Phys. Rev. Lett. 108 (2012) 251802 [arXiv:1204.0079] [INSPIRE].
LHCb collaboration, Measurement of the B + c meson lifetime using B + c → J/ψμ + ν μ X decays, Eur. Phys. J. C 74 (2014) 2839 [arXiv:1401.6932] [INSPIRE].
LHCb collaboration, Measurement of the lifetime of the B + c meson using the B + c → J/ψπ + decay mode, Phys. Lett. B 742 (2015) 29 [arXiv:1411.6899] [INSPIRE].
LHCb collaboration, Measurement of σ(pp → b \( \overline{b} \) X) at \( \sqrt{s}=7 \) TeV in the forward region, Phys. Lett. B 694 (2010) 209 [arXiv:1009.2731] [INSPIRE].
LHCb collaboration, Measurement of b hadron production fractions in 7 TeV pp collisions, Phys. Rev. D 85 (2012) 032008 [arXiv:1111.2357] [INSPIRE].
LHCb collaboration, Measurement of the b-quark production cross-section in 7 and 13 TeV pp collisions, Phys. Rev. Lett. 118 (2017) 052002 [arXiv:1612.05140] [INSPIRE].
LHCb collaboration, LHCb VELO Upgrade Technical Design Report, CERN-LHCC-2013-021 (2013) [INSPIRE].
LHCb collaboration, Measurement of the B± production cross-section in pp collisions at \( \sqrt{s}=7 \) and 13 TeV, JHEP 12 (2017) 026 [arXiv:1710.04921] [INSPIRE].
CDF collaboration, T. Aaltonen et al., Observation of orbitally excited B s mesons, Phys. Rev. Lett. 100 (2008) 082001 [arXiv:0710.4199] [INSPIRE].
LHCb collaboration, First observation of the B * s2 (5840)0 → B *+ K − and studies of excited B s mesons, Phys. Rev. Lett. 110 (2013) 151803 [arXiv:1211.5994] [INSPIRE].
LHCb collaboration, Observation of the decay B + c → B 0 s π +, Phys. Rev. Lett. 111 (2013) 181801 [arXiv:1308.4544] [INSPIRE].
LHCb collaboration, Evidence for the strangeness-changing weak decay Ξ − b → Λ 0 b π −, Phys. Rev. Lett. 115 (2015) 241801 [arXiv:1510.03829] [INSPIRE].
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1810.06657
Rights and permissions
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/.
About this article
Cite this article
Gershon, T., Poluektov, A. Displaced B −c mesons as an inclusive signature of weakly decaying double beauty hadrons. J. High Energ. Phys. 2019, 19 (2019). https://doi.org/10.1007/JHEP01(2019)019
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP01(2019)019