New particles discovered at the LHC
New fundamental particles
| Experiment | Particle | Mass | Date | Reference | Note |
|---|---|---|---|---|---|
| CMS | $\rm Higgs\ Boson$ | $125.3\pm0.7$ GeV | 31 Jul 2012 | Phys. Lett. B716 (2012) 30 | |
| ATLAS | $\rm Higgs\ Boson$ | $126.0\pm0.6$ GeV | 31 Jul 2012 | Phys. Lett. B716 (2012) 1 |
So far 1 fundamental particle has been discovered at the LHC.
New hadrons
| Experiment | Particle | Mass | Quarks | Date | Reference | Note |
|---|---|---|---|---|---|---|
| LHCb | $T_{c\bar{c}c\bar{c}}$ | $6905\pm13$ MeV | $c\bar{c}c\bar{c}$ | 30 Jun 2020 | arXiv:2006.16957 | Mass for one of the fits. |
| LHCb | $\Xi_c(2923)^0$ | $2923.0\pm0.3$ MeV | $csd$ | 30 Mar 2020 | arXiv:2003.13649 | |
| LHCb | $\Xi_c(2939)^0$ | $2939.6\pm0.3$ MeV | $csd$ | 30 Mar 2020 | arXiv:2003.13649 | |
| LHCb | $\Lambda_b(6070)^0$ | $6072.3\pm3.0$ MeV | $bud$ | 12 Feb 2020 | arXiv:2002.05112 | |
| LHCb | $\Omega_b(6340)^-$ | $6339.7\pm0.6$ MeV | $bss$ | 03 Jan 2020 | Phys. Rev. Lett. 124 (2020) 082002 | |
| LHCb | $\Omega_b(6350)^-$ | $6449.9\pm0.6$ MeV | $bss$ | 03 Jan 2020 | Phys. Rev. Lett. 124 (2020) 082002 | |
| LHCb | $\Lambda_b(6146)^0$ | $6146.2\pm0.4$ MeV | $bud$ | 31 Jul 2019 | Phys. Rev. Lett. 123 (2019) 152001 | |
| LHCb | $\Lambda_b(6152)^0$ | $6152.5\pm0.4$ MeV | $bud$ | 31 Jul 2019 | Phys. Rev. Lett. 123 (2019) 152001 | |
| LHCb | $P_c(4312)^+$ | $4312\,^{+\,7}_{-\,1}$ MeV | $c\bar{c}uud$ | 08 Apr 2019 | Phys. Rev. Lett. 122 (2019) 222001 | |
| LHCb | $P_c(4440)^+$ | $4440\pm5$ MeV | $c\bar{c}uud$ | 08 Apr 2019 | Phys. Rev. Lett. 122 (2019) 222001 | Resolves $P_c(4450)^+$ |
| LHCb | $P_c(4457)^+$ | $4457\,^{+\,4}_{-\,2}$ MeV | $c\bar{c}uud$ | 08 Apr 2019 | Phys. Rev. Lett. 122 (2019) 222001 | Resolves $P_c(4450)^+$ |
| LHCb | $X(3842)$ | $3842.7\pm0.2$ MeV | $c\bar{c} (q\bar{q}?)$ | 28 Mar 2019 | JHEP 1907 (2019) 035 | |
| CMS | $B_c(2S)^+$ | $6871.0\pm1.6$ MeV | $\bar{b}c$ | 01 Feb 2019 | Phys. Rev. Lett. 122 (2019) 132001 | Resolves $B_c(2S)^+$ (ATLAS). See 1. |
| CMS | $B_c^{*}(2S)^+$ | Undetermined | $\bar{b}c$ | 01 Feb 2019 | Phys. Rev. Lett. 122 (2019) 132001 | Resolves $B_c(2S)^+$ (ATLAS). See 1. |
| LHCb | $\Sigma_b(6097)^+$ | $6098.0\pm1.8$ MeV | $buu$ | 20 Sep 2018 | Phys. Rev. Lett. 122 (2019) 012001 | |
| LHCb | $\Sigma_b(6097)^-$ | $6095.8\pm1.8$ MeV | $bdd$ | 20 Sep 2018 | Phys. Rev. Lett. 122 (2019) 012001 | |
| LHCb | $Z_c(4100)^-$ | $4096\pm28$ MeV | $c\bar{c}d\bar{u}$ | 19 Sep 2018 | Eur. Phys. J. C78 (2018) 1019 | |
| LHCb | $\Xi_{cc}^{++}$ | $3621.4\pm0.8$ MeV | $ccu$ | 06 Jul 2017 | Phys. Rev. Lett. 119 (2017) 112001 | Weakly decaying |
| LHCb | $\Omega_c(3000)^0$ | $3000.4\,^{+\,0.4}_{-\,0.5}$ MeV | $css$ | 14 May 2017 | Phys. Rev. Lett. 118 (2017) 182001 | |
| LHCb | $\Omega_c(3050)^0$ | $3050.2\,^{+\,0.3}_{-\,0.5}$ MeV | $css$ | 14 May 2017 | Phys. Rev. Lett. 118 (2017) 182001 | |
| LHCb | $\Omega_c(3066)^0$ | $3065.6\,^{+\,0.4}_{-\,0.6}$ MeV | $css$ | 14 May 2017 | Phys. Rev. Lett. 118 (2017) 182001 | |
| LHCb | $\Omega_c(3090)^0$ | $3090.2\,^{+\,0.7}_{-\,0.8}$ MeV | $css$ | 14 May 2017 | Phys. Rev. Lett. 118 (2017) 182001 | |
| LHCb | $\Omega_c(3119)^0$ | $3119.1\,^{+\,1.0}_{-\,1.1}$ MeV | $css$ | 14 May 2017 | Phys. Rev. Lett. 118 (2017) 182001 | |
| LHCb | $X(4274)$ | $4147\,^{+\,6}_{-\,5}$ MeV | $c\bar{c}s\bar{s}$ | 25 Jun 2017 | Phys. Rev. Lett. 118 (2017) 022003 | |
| LHCb | $X(4500)$ | $4506\,^{+\,16}_{-\,18}$ MeV | $c\bar{c}s\bar{s}$ | 25 Jun 2017 | Phys. Rev. Lett. 118 (2017) 022003 | |
| LHCb | $X(4700)$ | $4704\,^{+\,17}_{-\,26}$ MeV | $c\bar{c}s\bar{s}$ | 25 Jun 2017 | Phys. Rev. Lett. 118 (2017) 022003 | |
| LHCb | $P_c(4450)^+$ | $4449.8\pm3.0$ MeV | $c\bar{c}uud$ | 13 Jul 2015 | Phys. Rev. Lett. 115 (2015) 072001 | Later resolved into $P_c(4440)^+$ and $P_c(4457)^+$ |
| LHCb | $P_c(4380)^+$ | $4380\pm30$ MeV | $c\bar{c}uud$ | 13 Jul 2015 | Phys. Rev. Lett. 115 (2015) 072001 | |
| LHCb | $B_J(5840)^+$ | $5851\pm19$ MeV | $\bar{b}u$ | 09 Feb 2015 | JHEP 1504 (2015) 024 | A state at 5960 is seen, which could be the $B_J(5970)$ seen by CDF. Also evidence for neutral states. |
| LHCb | $\Xi_b^{'-}$ | $5935.0\pm0.5$ MeV | $bsd$ | 18 Nov 2014 | Phys. Rev. Lett. 114 (2015) 062004 | |
| LHCb | $\Xi_b^{*-}$ | $5955.3\pm0.5$ MeV | $bsd$ | 18 Nov 2014 | Phys. Rev. Lett. 114 (2015) 062004 | |
| LHCb | $D_{s3}(2860)^-$ | $2860\pm6$ MeV | $c\bar{s}$ | 28 Jul 2014 | Phys. Rev. Lett. 113 (2014) 162001 | Previoulsy known $D_{s}(2860)^-$ resolved into spin-1 and 3 states |
| ATLAS | $B_c(2S)^+$ | $6842\pm7$ MeV | $\bar{b}c$ | 04 Jul 2014 | Phys. Rev. Lett. 113 (2014) 212004 | Resolved into two states by CMS |
| CMS | $X(4140)$ | $4148\pm7$ MeV | $c\bar{c}s\bar{s}$ | 26 Sep 2013 | Phys. Lett. B 734 (2014) 261 | Confirmed by LHCb in 2016 |
| LHCb | $\Lambda_b(5912)^0$ | $5912.0\pm0.7$ MeV | $bud$ | 15 May 2012 | Phys. Rev. Lett. 109 (2012) 172003 | |
| LHCb | $\Lambda_b(5920)^0$ | $5912.0\pm0.7$ MeV | $bud$ | 15 May 2012 | Phys. Rev. Lett. 109 (2012) 172003 | |
| CMS | $\Xi_b^{*0}$ | $5945\pm3$ MeV | $bsu$ | 26 Apr 2012 | Phys. Rev. Lett. 108 (2012) 252002 | |
| ATLAS | $\chi_b(3P)$ | $10.53\pm0.01$ GeV | $b\bar{b}$ | 21 Dec 2011 | Phys. Rev. Lett. 108 (2012) 152001 |
So far 37 hadrons have been discovered at the LHC, of which 31 by LHCb
 Resonances per year |
 Resonances versus time |
 Masses and discovery dates |
Only first observations of particles with $5\sigma$ significance are listed. $q$ stands for $u$ or $d$. If a peak is observed and later resolved into several components, both papers are listed but particles are not double counted.
Notes:1. Two peaks are observed. One is the $B_c(2S)^+$, the other likely the partially-reconstructed $B_c^*(2S)^+$. Which one is which is yet unclear.
Please report mistakes and omissions.