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MASS LIMITS for ${{\mathit g}_{{{A}}}}$ (axigluon) and Other Color-Octet Gauge Bosons

Axigluons are massive color-octet gauge bosons in chiral color models and have axial-vector coupling to quarks with the same coupling strength as gluons.

VALUE (GeV)

CL%

DOCUMENT ID

TECN

COMMENT

$\bf{ > 6600}$

OUR LIMIT

$\bf{\text{none 1800 - 6600}}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 600 - 6100}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 600 - 5500}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 1500 - 5100}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 500 - 1600}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 1300 - 3600}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

• • We do not use the following data for averages, fits, limits, etc. • •

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit g}_{{{A}}}}$ $\rightarrow$ 8 ${{\mathit j}}$

ATLS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$ , ${{\mathit g}_{{{A}}}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit b}}{{\overline{\mathit b}}}$

$> 2800$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{KK}}}}{{\mathit X}}$, ${{\mathit g}_{{{KK}}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \Theta}^{0}}{{\mathit \Theta}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}{{\mathit Z}}{{\mathit g}}$

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ ${{\mathit \sigma}}{{\mathit \sigma}}$, ${{\mathit \sigma}}$ ${{\mathit j}}$

$> 3360$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 1000 - 3270}$

95

CMS

Superseded by KHACHATRYAN 2015V

$\text{none 250 - 740}$

95

CMS

${{\mathit p}}$ ${{\mathit p}}$ $\rightarrow$ 2 ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$> 775$

95

D0

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$

$> 2470$

95

CMS

Superseded by CHATRCHYAN 2013A

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}{{\mathit X}}$, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}$

$\text{none 1470 - 1520}$

95

CMS

Superseded by CHATRCHYAN 2013A

$\text{none 260 - 1250}$

95

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$> 910$

95

RVUE

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit t}}{{\overline{\mathit t}}}{{\mathit X}}$

$>365$

95

RVUE

$\Gamma\mathrm {( {{\mathit Z}} \rightarrow hadron)}$

$\text{none 200 - 980}$

95

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$\text{none 200 - 870}$

95

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$

$\text{none 240 - 640}$

95

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$>50$

95

RVUE

${\mathit \sigma (}$ ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ hadrons${)}$

$\text{none 120-210}$

95

CDF

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$>29$

THEO

Partial-wave unitarity

$\text{none 150-310}$

95

UA1

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit g}_{{{A}}}}$ X, ${{\mathit g}_{{{A}}}}$ $\rightarrow$ 2 ${{\mathit j}}$

$>20$

RVUE

${{\mathit p}}$ ${{\overline{\mathit p}}}$ $\rightarrow$ ${{\mathit \Upsilon}}$ X via ${{\mathit g}_{{{A}}}}{{\mathit g}}$

$>9$

RVUE

${{\mathit \Upsilon}}$ decay

$>25$

RVUE

${{\mathit \Upsilon}}$ decay

¹	SIRUNYAN 2020AI search for resonances decaying into dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV.

²	SIRUNYAN 2018BO search for resonances decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV.

³	KHACHATRYAN 2017W search for resonances decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV.

⁴	KHACHATRYAN 2016K search for resonances decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV.

⁵	KHACHATRYAN 2016L search for resonances decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV with the data scouting technique, increasing the sensitivity to the low mass resonances.

⁶	KHACHATRYAN 2015V search for resonances decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV.

⁷	KHACHATRYAN 2017Y search for pair production of color-octet gauge boson ${{\mathit g}_{{{A}}}}$ each decaying to 4${{\mathit j}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV.

⁸

AAD 2016W search for a new resonance decaying to a pair of ${{\mathit b}}$ and ${{\mathit B}_{{{H}}}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The vector-like quark ${{\mathit B}_{{{H}}}}$ is assumed to decay to . See their Fig. 3 and Fig. 4 for limits on $\sigma \cdot{}\mathit B$.

⁹	KHACHATRYAN 2016E search for KK gluon decaying to ${{\mathit t}}{{\overline{\mathit t}}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV.

¹⁰

KHACHATRYAN 2015AV search for pair productions of neutral color-octet weak-triplet scalar particles (${{\mathit \Theta}^{0}}$), decaying to ${{\mathit b}}{{\overline{\mathit b}}}$, ${{\mathit Z}}{{\mathit g}}$ or ${{\mathit \gamma}}{{\mathit g}}$, in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The ${{\mathit \Theta}^{0}}$ particle is often predicted in coloron (${{\mathit G}^{\,'}}$, color-octet gauge boson) models and appear in the ${{\mathit p}}{{\mathit p}}$ collisions through ${{\mathit G}^{\,'}}$ $\rightarrow$ ${{\mathit \Theta}^{0}}{{\mathit \Theta}^{0}}$ decays. Assuming B( ${{\mathit \Theta}^{0}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$) = 0.5, they give limits ${\mathit m}_{{{\mathit \Theta}^{0}}}$ $>$ 623 GeV (426 GeV) for ${\mathit m}_{{{\mathit G}^{\,'}}}$ = 2.3 ${\mathit m}_{{{\mathit \Theta}^{0}}}$ (${\mathit m}_{{{\mathit G}^{\,'}}}$ = 5 ${\mathit m}_{{{\mathit \Theta}^{0}}}$).

¹¹

AALTONEN 2013R search for new resonance decaying to ${{\mathit \sigma}}{{\mathit \sigma}}$, with hypothetical strongly interacting ${{\mathit \sigma}}$ particle subsequently decaying to 2 jets, in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\sqrt {s }$ = 1.96 TeV, using data corresponding to an integrated luminosity of 6.6 fb${}^{-1}$. For 50 GeV $<$ ${\mathit m}_{{{\mathit \sigma}}}$ $<$ ${\mathit m}_{{{\mathit g}_{{{A}}}}}$/2, axigluons in mass range $150 - 400$ GeV are excluded.

¹²	CHATRCHYAN 2013A search for new resonance decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV.

¹³	CHATRCHYAN 2013AS search for new resonance decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV.

¹⁴	CHATRCHYAN 2013AU search for the pair produced color-octet vector bosons decaying to ${{\mathit q}}{{\overline{\mathit q}}}$ pairs in ${{\mathit p}}{{\mathit p}}$ collisions. The quoted limit is for B( ${{\mathit g}_{{{A}}}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$) = 1.

¹⁵	ABAZOV 2012R search for massive color octet vector particle decaying to ${{\mathit t}}{{\overline{\mathit t}}}$. The quoted limit assumes ${{\mathit g}_{{{A}}}}$ couplings with light quarks are suppressed by 0.2.

¹⁶	CHATRCHYAN 2011Y search for new resonance decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }~=~7~$TeV.

¹⁷	AALTONEN 2010L search for massive color octet non-chiral vector particle decaying into ${{\mathit t}}{{\overline{\mathit t}}}$ pair with mass in the range 400 GeV $<$ M $<$ 800 GeV. See their Fig.$~$6 for limit in the mass-coupling plane.

¹⁸	KHACHATRYAN 2010 search for new resonance decaying to dijets in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }~=~7~$TeV.

¹⁹	AALTONEN 2009AC search for new narrow resonance decaying to dijets.

²⁰	CHOUDHURY 2007 limit is from the ${{\mathit t}}{{\overline{\mathit t}}}$ production cross section measured at CDF.

²¹	DONCHESKI 1998 compare $\alpha _{\mathit s}$ derived from low-energy data and that from $\Gamma\mathrm {( {{\mathit Z}} \rightarrow hadrons)}/\Gamma\mathrm {( {{\mathit Z}} \rightarrow leptons)}$.

²²	ABE 1997G search for new particle decaying to dijets.

²³	ABE 1995N assume axigluons decaying to quarks in the Standard Model only.

²⁴	ABE 1993G assume $\Gamma\mathrm {({{\mathit g}_{{{A}}}})}$ = $\mathit N{{\mathit \alpha}_{{{s}}}}{\mathit m}_{{{\mathit g}_{{{A}}}}}$/6 with $\mathit N$ = 10.

²⁵	CUYPERS 1991 compare $\alpha _{\mathit s}$ measured in ${{\mathit \Upsilon}}$ decay and that from $\mathit R$ at PEP/PETRA energies.

²⁶

ABE 1990H assumes $\Gamma\mathrm {({{\mathit g}_{{{A}}}})}$ = $\mathit N{{\mathit \alpha}_{{{s}}}}{\mathit m}_{{{\mathit g}_{{{A}}}}}$/6 with $\mathit N$ = 5$~(\Gamma\mathrm {({{\mathit g}_{{{A}}}})}$ = 0.09${\mathit m}_{{{\mathit g}_{{{A}}}}}$). For $\mathit N$ = 10, the excluded region is reduced to 120$-$150 GeV.

²⁷

ROBINETT 1989 result demands partial-wave unitarity of $\mathit J = 0$ ${\mathit {\mathit t}}$ ${\mathit {\overline{\mathit t}}}$ $\rightarrow$ ${\mathit {\mathit t}}$ ${\mathit {\overline{\mathit t}}}$ scattering amplitude and derives a limit ${\mathit m}_{{{\mathit g}_{{{A}}}}}$ $>$ $0.5$ ${\mathit m}_{{{\mathit t}}}$. Assumes ${\mathit m}_{{{\mathit t}}}$ $>$ 56 GeV.

²⁸	ALBAJAR 1988B result is from the nonobservation of a peak in two-jet invariant mass distribution. $\Gamma\mathrm {({{\mathit g}_{{{A}}}})}$ $<$ $0.4$ ${\mathit m}_{{{\mathit g}_{{{A}}}}}$ assumed. See also BAGGER 1988.

²⁹	CUYPERS 1988 requires $\Gamma\mathrm {( {{\mathit \Upsilon}} \rightarrow {{\mathit g}} {{\mathit g}_{{{A}}}})}<\Gamma\mathrm {( {{\mathit \Upsilon}} \rightarrow {{\mathit g}} {{\mathit g}} {{\mathit g}})}$. A similar result is obtained by DONCHESKI 1988.

³⁰

DONCHESKI 1988B requires $\Gamma\mathrm {( {{\mathit \Upsilon}} \rightarrow {{\mathit g}} {{\mathit q}} {{\overline{\mathit q}}})}/\Gamma\mathrm {( {{\mathit \Upsilon}} \rightarrow {{\mathit g}} {{\mathit g}} {{\mathit g}})}$ $<$ $0.25$, where the former decay proceeds via axigluon exchange. A more conservative estimate of $<$ $0.5$ leads to ${\mathit m}_{{{\mathit g}_{{{A}}}}}$ $>$ 21 GeV.

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