MASS LIMITS for Excited ${{\mathit q}}$ (${{\mathit q}^{*}}$)

Limits for Excited ${{\mathit q}}$ (${{\mathit q}^{*}}$) from Pair Production

INSPIRE   PDGID:
S054EQP
These limits are mostly obtained from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}^{*}}{{\overline{\mathit q}}^{*}}$ and thus rely only on the (electroweak) charge of the ${{\mathit q}^{*}}$. Form factor effects are ignored unless noted. Assumptions about the ${{\mathit q}^{*}}$ decay are given in the comments and footnotes.
VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$\bf{> 338}$ 95 1
AALTONEN
2010H
 CDF ${{\mathit q}^{*}}$ $\rightarrow$ ${{\mathit t}}{{\mathit W}^{-}}$
• • We do not use the following data for averages, fits, limits, etc. • •
$\text{none 700 - 1200}$ 95 2
SIRUNYAN
2018V
 CMS ${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit t}_{{{3/2}}}^{*}}{{\overline{\mathit t}}_{{{3/2}}}^{*}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}{{\mathit g}}{{\mathit g}}$
3
BARATE
1998U
 ALEP ${{\mathit Z}}$ $\rightarrow$ ${{\mathit q}^{*}}{{\mathit q}^{*}}$
$>45.6$ 95 4
ADRIANI
1993M
 L3 ${{\mathit u}}$ or ${{\mathit d}}$ type, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit q}^{*}}{{\mathit q}^{*}}$
$>41.7$ 95 5
BARDADIN-O..
1992
RVUE ${{\mathit u}}$-type, $\Gamma\mathrm {({{\mathit Z}})}$
$>44.7$ 95 5
BARDADIN-O..
1992
RVUE ${{\mathit d}}$-type, $\Gamma\mathrm {({{\mathit Z}})}$
$>40.6$ 95 6
DECAMP
1992
ALEP ${{\mathit u}}$-type, $\Gamma\mathrm {({{\mathit Z}})}$
$>44.2$ 95 6
DECAMP
1992
ALEP ${{\mathit d}}$-type, $\Gamma\mathrm {({{\mathit Z}})}$
$>45$ 95 7
DECAMP
1992
ALEP ${{\mathit u}}$ or ${{\mathit d}}$ type, ${{\mathit Z}}$ $\rightarrow$ ${{\mathit q}^{*}}{{\mathit q}^{*}}$
$>45$ 95 6
ABREU
1991F
 DLPH ${\mathit {\mathit u}}$-type, $\Gamma\mathrm {({{\mathit Z}})}$
$>45$ 95 6
ABREU
1991F
 DLPH ${\mathit {\mathit d}}$-type, $\Gamma\mathrm {({{\mathit Z}})}$
1  AALTONEN 2010H obtain limits on the ${{\mathit q}^{*}}{{\mathit q}^{*}}$ production cross section in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions. See their Fig.$~$3.
2  SIRUNYAN 2018V search for pair production of spin 3/2 excited top quarks. B( ${{\mathit t}_{{{3/2}}}^{*}}$ $\rightarrow$ ${{\mathit t}}{{\mathit g}}$ ) = 1 is assumed.
3  BARATE 1998U obtain limits on the form factor. See their Fig.$~$16 for limits in mass-form factor plane.
4  ADRIANI 1993M limit is valid for B( ${{\mathit q}^{*}}$ $\rightarrow$ ${{\mathit q}}{{\mathit g}}$ )$>0.25$ ($0.17$) for up (down) type.
5  BARDADIN-OTWINOWSKA 1992 limit based on $\Delta \Gamma\mathrm {({{\mathit Z}})}<$36 MeV.
6  These limits are independent of decay modes.
7  Limit is for B( ${{\mathit q}^{*}}$ $\rightarrow$ ${{\mathit q}}{{\mathit g}}$ )$+$B( ${{\mathit q}^{*}}$ $\rightarrow$ ${{\mathit q}}{{\mathit \gamma}}$ )=1.
References:
SIRUNYAN 2018V
PL B778 349 Search for pair production of excited top quarks in the lepton + jets final state
AALTONEN 2010H
PRL 104 091801 Search for New Bottomlike Quark Pair Decays ${{\mathit Q}}$ ${{\overline{\mathit Q}}}$ $\rightarrow$ ( ${{\mathit t}}{{\mathit W}^{\mp}}$) ( ${{\overline{\mathit t}}}{{\mathit W}^{\pm}}$) in Same-Charge Dilepton Events
BARATE 1998U
EPJ C4 571 Search for Evidence of Compositeness at LEP I
ADRIANI 1993M
PRPL 236 1 Results from the L3 Experiment at LEP
BARDADIN-OTWINOWSKA 1992
ZPHY C55 163 Limits on Compositeness from Lepton and Photon Channels at LEP
DECAMP 1992
PRPL 216 253 Searches for New Particles in ${{\mathit Z}}$ Decays using the ALEPH Detector
ABREU 1991F
NP B367 511 Determination of ${{\mathit Z}^{0}}$ Resonance Parameters and Couplings from its Hadronic and Leptonic Decays