# MASS LIMITS for Leptoquarks from Pair Production INSPIRE search

These limits rely only on the color or electroweak charge of the leptoquark.

VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
$>740$ 95 1
 2017 J
CMS Third generation
$\bf{> 850}$ 95 2
 2017 H
CMS Third generation
$\bf{> 1050}$ 95 3
 2016 G
ATLS First generation
$> 1000$ 95 4
 2016 G
ATLS Second generation
$> 625$ 95 5
 2016 G
ATLS Third generation
$\text{none 200 - 640}$ 95 6
 2016 G
ATLS Third generation
$> 1010$ 95 7
 2016 AF
CMS First generation
$\bf{> 1080}$ 95 8
 2016 AF
CMS Second generation
$> 685$ 95 9
 2015 AJ
CMS Third generation
$> 740$ 95 10
 2014 T
CMS Third generation
• • • We do not use the following data for averages, fits, limits, etc. • • •
$> 534$ 95 11
 2013 AE
ATLS Third generation
$> 525$ 95 12
 2013 M
CMS Third generation
$> 660$ 95 13
 2012 H
ATLS First generation
$> 685$ 95 14
 2012 O
ATLS Second generation
$> 830$ 95 15
 2012 AG
CMS First generation
$> 840$ 95 16
 2012 AG
CMS Second generation
$> 450$ 95 17
 2012 BO
CMS Third generation
$> 376$ 95 18
 2011 D
ATLS Superseded by AAD 2012H
$> 422$ 95 19
 2011 D
ATLS Superseded by AAD 2012O
$> 326$ 95 20
 2011 V
D0 First generation
$> 339$ 95 21
 2011 N
CMS Superseded by CHATRCHYAN 2012AG
$> 384$ 95 22
 2011 D
CMS Superseded by CHATRCHYAN 2012AG
$> 394$ 95 23
 2011 E
CMS Superseded by CHATRCHYAN 2012AG
$> 247$ 95 24
 2010 L
D0 Third generation
$> 316$ 95 25
 2009
D0 Second generation
$> 299$ 95 26
 2009 AF
D0 Superseded by ABAZOV 2011V
27
 2008 P
CDF Third generation
$> 153$ 95 28
 2008 Z
CDF Third generation
$> 205$ 95 29
D0 All generations
$> 210$ 95 28
 2008 AN
D0 Third generation
$> 229$ 95 30
 2007 J
D0 Superseded by ABAZOV 2010L
$> 251$ 95 31
 2006 A
D0 Superseded by ABAZOV 2009
$> 136$ 95 32
 2006 L
D0 Superseded by ABAZOV 2008AD
$> 226$ 95 33
 2006 T
CDF Second generation
$> 256$ 95 34
 2005 H
D0 First generation
$>117$ 95 29
 2005 I
CDF First generation
$> 236$ 95 35
 2005 P
CDF First generation
$>99$ 95 36
 2003 R
OPAL First generation
$>100$ 95 36
 2003 R
OPAL Second generation
$>98$ 95 36
 2003 R
OPAL Third generation
$>98$ 95 37
 2002
D0 All generations
$>225$ 95 38
 2001 D
D0 First generation
$>85.8$ 95 39
 2000 M
OPAL Superseded by ABBIENDI 2003R
$>85.5$ 95 39
 2000 M
OPAL Superseded by ABBIENDI 2003R
$>82.7$ 95 39
 2000 M
OPAL Superseded by ABBIENDI 2003R
$>200$ 95 40
 2000 C
D0 Second generation
$>123$ 95 41
 2000 K
CDF Second generation
$> 148$ 95 42
 2000 K
CDF Third generation
$>160$ 95 43
 1999 J
D0 Second generation
$>225$ 95 44
 1998 E
D0 First generation
$>94$ 95 45
 1998 J
D0 Third generation
$> 202$ 95 46
 1998 S
CDF Second generation
$>242$ 95 47
 1998
First generation
$>99$ 95 48
 1997 F
CDF Third generation
$>213$ 95 49
 1997 X
CDF First generation
$>45.5$ 95 50, 51
 1993 J
DLPH First + second generation
$>44.4$ 95 52
 1993 M
L3 First generation
$>44.5$ 95 52
 1993 M
L3 Second generation
$>45$ 95 52
 1992
ALEP Third generation
$\text{none 8.9 - 22.6}$ 95 53
 1990
AMY First generation
$\text{none 10.2 - 23.2}$ 95 53
 1990
AMY Second generation
$\text{none 5 - 20.8}$ 95 54
 1987 B
$\text{none 7 - 20.5}$ 95 55
 1986 B
CELL
1  KHACHATRYAN 2017J search for scalar leptoquarks decaying to ${{\mathit \tau}}{{\mathit b}}$ using ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 13 TeV. The limit above assumes B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
2  SIRUNYAN 2017H search for scalar leptoquarks using ${{\mathit \tau}}{{\mathit \tau}}{{\mathit b}}{{\mathit b}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
3  AAD 2016G search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ events in collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes $\mathit B$( ${{\mathit e}}{{\mathit q}}$ ) = 1.
4  AAD 2016G search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ events in collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes $\mathit B$( ${{\mathit \mu}}{{\mathit q}}$ ) = 1.
5  AAD 2016G search for scalar leptoquarks decaying to ${{\mathit b}}{{\mathit \nu}}$ . The limit above assumes $\mathit B$( ${{\mathit b}}{{\mathit \nu}}$ ) = 1.
6  AAD 2016G search for scalar leptoquarks decaying to ${{\mathit t}}{{\mathit \nu}}$ . The limit above assumes $\mathit B$( ${{\mathit t}}{{\mathit \nu}}$ ) = 1.
7  KHACHATRYAN 2016AF search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ )= 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5, the limit becomes 850 GeV.
8  KHACHATRYAN 2016AF search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5, the limit becomes 760 GeV.
9  KHACHATRYAN 2015AJ search for scalar leptoquarks using ${{\mathit \tau}}{{\mathit \tau}}{{\mathit t}}{{\mathit t}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes $\mathit B$( ${{\mathit \tau}}{{\mathit t}}$ ) = 1.
10  KHACHATRYAN 2014T search for scalar leptoquarks decaying to ${{\mathit \tau}}{{\mathit b}}$ using ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 8 TeV. The limit above assumes B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1. See their Fig. 5 for the exclusion limit as function of B( ${{\mathit \tau}}{{\mathit b}}$ ).
11  AAD 2013AE search for scalar leptoquarks using ${{\mathit \tau}}{{\mathit \tau}}{{\mathit b}}{{\mathit b}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7$~$TeV. The limit above assumes B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
12  CHATRCHYAN 2013M search for scalar and vector leptoquarks decaying to ${{\mathit \tau}}{{\mathit b}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above is for scalar leptoquarks with B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
13  AAD 2012H search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}$ ${{\mathit j}}{{\mathit j}}$ and ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5, the limit becomes 607 GeV.
14  AAD 2012O search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5, the limit becomes 594 GeV.
15  CHATRCHYAN 2012AG search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5, the limit becomes 640 GeV.
16  CHATRCHYAN 2012AG search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5, the limit becomes 650 GeV.
17  CHATRCHYAN 2012BO search for scalar leptoquarks decaying to ${{\mathit \nu}}{{\mathit b}}$ in ${{\mathit p}}{{\mathit p}}$ collisions at $\sqrt {s }$ = 7 TeV. The limit above assumes B( ${{\mathit \nu}}{{\mathit b}}$ ) = 1.
18  AAD 2011D search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV.The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5, the limit becomes 319 GeV.
19  AAD 2011D search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5, the limit becomes 362 GeV.
20  ABAZOV 2011V search for scalar leptoquarks using ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5.
21  CHATRCHYAN 2011N search for scalar leptoquarks using ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5.
22  KHACHATRYAN 2011D search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1.
23  KHACHATRYAN 2011E search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 7 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1.
24  ABAZOV 2010L search for pair productions of scalar leptoquark state decaying to ${{\mathit \nu}}{{\mathit b}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. The limit above assumes B( ${{\mathit \nu}}{{\mathit b}}$ ) = 1.
25  ABAZOV 2009 search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5, the limit becomes 270 GeV.
26  ABAZOV 2009AF search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5 the bound becomes 284 GeV.
27  AALTONEN 2008P search for vector leptoquarks using ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}{{\mathit b}}{{\overline{\mathit b}}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. Assuming Yang-Mills (minimal) couplings, the mass limit is $>$317 GeV (251 GeV) at 95$\%$ CL for B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
28  Search for pair production of scalar leptoquark state decaying to ${{\mathit \tau}}{{\mathit b}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$= 1.96 TeV. The limit above assumes B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
29  Search for scalar leptoquarks using ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\overline{\mathit p}}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. The limit above assumes B( ${{\mathit \nu}}{{\mathit q}}$ ) = 1.
30  ABAZOV 2007J search for pair productions of scalar leptoquark state decaying to ${{\mathit \nu}}{{\mathit b}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96 TeV. The limit above assumes B( ${{\mathit \nu}}{{\mathit b}}$ ) = 1.
31  ABAZOV 2006A search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.8 TeV and 1.96 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5, the limit becomes 204 GeV.
32  ABAZOV 2006L search for scalar leptoquarks using ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.8$~$TeV and at 1.96$~$TeV. The limit above assumes B( ${{\mathit \nu}}{{\mathit q}}$ ) = 1.
33  ABULENCIA 2006T search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ , ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ , and ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96$~$TeV. The quoted limit assumes B( ${{\mathit \mu}}{{\mathit q}}$ ) = 1. For B( ${{\mathit \mu}}{{\mathit q}}$ ) = 0.5 or 0.1, the bound becomes 208$~$GeV or 143$~$GeV, respectively. See their Fig.$~$4 for the exclusion limit as a function of B( ${{\mathit \mu}}{{\mathit q}}$ ).
34  ABAZOV 2005H search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ and ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\overline{\mathit p}}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.8 TeV and 1.96 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5 the bound becomes 234 GeV.
35  ACOSTA 2005P search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ , ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\overline{\mathit p}}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = 1.96TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ ) = 1. For B( ${{\mathit e}}{{\mathit q}}$ ) = 0.5 and 0.1, the bound becomes 205 GeV and 145 GeV, respectively.
36  ABBIENDI 2003R search for scalar/vector leptoquarks in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions at $\sqrt {s }$ = $189 - 209$ GeV. The quoted limits are for charge $−$4/3 isospin 0 scalar-leptoquark with B( ${{\mathit \ell}}{{\mathit q}}$ ) = 1. See their table 12 for other cases.
37  ABAZOV 2002 search for scalar leptoquarks using ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\overline{\mathit p}}}{{\mathit p}}$ collisions at $\mathit E_{{\mathrm {cm}}}$=1.8 TeV. The bound holds for all leptoquark generations. Vector leptoquarks are likewise constrained to lie above 200 GeV.
38  ABAZOV 2001D search for scalar leptoquarks using ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ , ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ , and ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$=1.8 TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ )=1. For B( ${{\mathit e}}{{\mathit q}}$ )=$0.5$ and 0, the bound becomes 204 and 79$~$GeV, respectively. Bounds for vector leptoquarks are also given. Supersedes ABBOTT 1998E.
39  ABBIENDI 2000M search for scalar/vector leptoquarks in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ collisions at $\sqrt {\mathit s }$=183 GeV. The quoted limits are for charge $-4$/3 isospin$~$0 scalar-leptoquarks with B( ${{\mathit \ell}}{{\mathit q}}$ )=1. See their Table$~$8 and Figs.$~6 - 9$ for other cases.
40  ABBOTT 2000C search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ , ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ , and ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$=1.8 TeV. The limit above assumes B( ${{\mathit \mu}}{{\mathit q}}$ )=1. For B( ${{\mathit \mu}}{{\mathit q}}$ )=0.5 and 0, the bound becomes 180 and 79 GeV respectively. Bounds for vector leptoquarks are also given.
41  AFFOLDER 2000K search for scalar leptoquark using ${{\mathit \nu}}{{\mathit \nu}}{{\mathit c}}{{\mathit c}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}=1.8~$TeV. The quoted limit assumes B( ${{\mathit \nu}}{{\mathit c}}$ )=1. Bounds for vector leptoquarks are also given.
42  AFFOLDER 2000K search for scalar leptoquark using ${{\mathit \nu}}{{\mathit \nu}}{{\mathit b}}{{\mathit b}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}=1.8~$TeV. The quoted limit assumes B( ${{\mathit \nu}}{{\mathit b}}$ )=1. Bounds for vector leptoquarks are also given.
43  ABBOTT 1999J search for leptoquarks using ${{\mathit \mu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$= $1.8$TeV. The quoted limit is for a scalar leptoquark with B( ${{\mathit \mu}}{{\mathit q}}$ ) = B( ${{\mathit \nu}}{{\mathit q}}$ ) = $0.5$. Limits on vector leptoquarks range from 240 to 290 GeV.
44  ABBOTT 1998E search for scalar leptoquarks using ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ , ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ , and ${{\mathit \nu}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}=1.8$ TeV. The limit above assumes B( ${{\mathit e}}{{\mathit q}}$ )=1. For B( ${{\mathit e}}{{\mathit q}}$ )=$0.5$ and 0, the bound becomes 204 and 79 GeV, respectively.
45  ABBOTT 1998J search for charge $−$1/3 third generation scalar and vector leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$= $1.8$ TeV. The quoted limit is for scalar leptoquark with B( ${{\mathit \nu}}{{\mathit b}}$ )=1.
46  ABE 1998S search for scalar leptoquarks using ${{\mathit \mu}}{{\mathit \mu}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$= $1.8~$TeV. The limit is for B( ${{\mathit \mu}}{{\mathit q}}$ )= 1. For B( ${{\mathit \mu}}{{\mathit q}}$ )=B( ${{\mathit \nu}}{{\mathit q}}$ )=$0.5$, the limit is $>160$ GeV.
47  GROSS-PILCHER 1998 is the combined limit of the CDF and ${D0}$ Collaborations as determined by a joint CDF/${D0}$ working group and reported in this FNAL Technical Memo. Original data published in ABE 1997X and ABBOTT 1998E.
48  ABE 1997F search for third generation scalar and vector leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}$ = $1.8$ TeV. The quoted limit is for scalar leptoquark with B( ${{\mathit \tau}}{{\mathit b}}$ ) = 1.
49  ABE 1997X search for scalar leptoquarks using ${{\mathit e}}{{\mathit e}}{{\mathit j}}{{\mathit j}}$ events in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at $\mathit E_{{\mathrm {cm}}}=1.8$ TeV. The limit is for B( ${{\mathit e}}{{\mathit q}}$ )=1.
50  Limit is for charge $−$1/3 isospin-0 leptoquark with B( ${{\mathit \ell}}{{\mathit q}}$ ) = 2/3.
51  First and second generation leptoquarks are assumed to be degenerate. The limit is slightly lower for each generation.
52  Limits are for charge $−$1/3, isospin-0 scalar leptoquarks decaying to ${{\mathit \ell}^{-}}{{\mathit q}}$ or ${{\mathit \nu}}{{\mathit q}}$ with any branching ratio. See paper for limits for other charge-isospin assignments of leptoquarks.
53  KIM 1990 assume pair production of charge 2/3 scalar-leptoquark via photon exchange. The decay of the first (second) generation leptoquark is assumed to be any mixture of ${{\mathit d}}{{\mathit e}^{+}}$ and ${{\mathit u}}{{\overline{\mathit \nu}}}$ ( ${{\mathit s}}{{\mathit \mu}^{+}}$ and ${{\mathit c}}{{\overline{\mathit \nu}}}$ ). See paper for limits for specific branching ratios.
54  BARTEL 1987B limit is valid when a pair of charge 2/3 spinless leptoquarks X is produced with point coupling, and when they decay under the constraint B( X $\rightarrow$ ${{\mathit c}}{{\overline{\mathit \nu}}_{{\mu}}}$ ) $+$ B( X $\rightarrow$ ${{\mathit s}}{{\mathit \mu}^{+}}$ ) = 1.
55  BEHREND 1986B assumed that a charge 2/3 spinless leptoquark, ${{\mathit \chi}}$, decays either into ${\mathit {\mathit s}}$ ${{\mathit \mu}^{+}}$ or ${\mathit {\mathit c}}$ ${{\overline{\mathit \nu}}}$ : B( ${{\mathit \chi}}$ $\rightarrow$ ${\mathit {\mathit s}}$ ${{\mathit \mu}^{+}}$ ) $+$ B( ${{\mathit \chi}}$ $\rightarrow$ ${\mathit {\mathit c}}$ ${{\overline{\mathit \nu}}}$ ) = 1.
References:
 KHACHATRYAN 2017J
JHEP 1703 077 Search for Heavy Neutrinos or Third-Generation Leptoquarks in Final States with Two Hadronically Decaying ${{\mathit \tau}}$ Leptons and Two Jets in Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV
 SIRUNYAN 2017H
JHEP 1707 121 Search for Third-Generation Scalar Leptoquarks and Heavy Right-Handed Neutrinos in Final States with Two Tau Leptons and Two Jets in Proton-Proton Collisions at $\sqrt {s }$ = 13 TeV
EPJ C76 5 Searches for Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 8 TeV with the ATLAS Detector
 KHACHATRYAN 2016AF
PR D93 032004 Search for Pair Production of First and Second Generation Leptoquarks in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
 KHACHATRYAN 2015AJ
JHEP 1507 042 Search for Third-Generation Scalar Leptoquarks in the ${\mathit {\mathit t}}{{\mathit \tau}}$ Channel in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
 KHACHATRYAN 2014T
PL B739 229 Search for Pair Production of Third-Generation Scalar Leptoquarks and Top squarks in Proton-Proton Collisions at $\sqrt {s }$ = 8 TeV
JHEP 1306 033 Search for Third Generation Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
 CHATRCHYAN 2013M
PRL 110 081801 Search for Pair Production of Third-Generation Leptoquarks and Top Squarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
PL B709 158 Search for First Generation Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
EPJ C72 2151 Search for Second Generation Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV with the ATLAS Detector
 CHATRCHYAN 2012AG
PR D86 052013 Search for Pair Production of First- and Second-Generation Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
 CHATRCHYAN 2012BO
JHEP 1212 055 Search for Third-Generation Leptoquarks and Scalar Bottom Quarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
PR D83 112006 Search for Pair Production of First or Second Generation Leptoquarks in Proton$−$Proton Collisions at $\sqrt {s }$ = 7 TeV using the ATLAS Detector at the LHC
 ABAZOV 2011V
PR D84 071104 Search for First Generation Leptoquark Pair Production in the Electron + Missing Energy + Jets Final State
 CHATRCHYAN 2011N
PL B703 246 Search for First Generation Scalar Leptoquarks in the ${{\mathit e}}{{\mathit \nu}}{{\mathit j}}{{\mathit j}}$ Channel in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
 KHACHATRYAN 2011D
PRL 106 201802 Search for Pair Production of First-Generation Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
 KHACHATRYAN 2011E
PRL 106 201803 Search for Pair Production of Second-Generation Scalar Leptoquarks in ${{\mathit p}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 7 TeV
 ABAZOV 2010L
PL B693 95 Search for Scalar Bottom Quarks and Third-Generation Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABAZOV 2009
PL B671 224 Search for Pair Production os Second Generation Scalar Leptoquarks
 ABAZOV 2009AF
PL B681 224 Search for Pair Production of First-Generation Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96$~$TeV
 AALTONEN 2008P
PR D77 091105 Search for Third Generation Vector Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 AALTONEN 2008Z
PRL 101 071802 Search for Pair Production of Scalar Top Quarks Decaying to a ${{\mathit \tau}}$ Lepton and a ${\mathit {\mathit b}}$ Quark in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
PL B668 357 Search for Scalar Leptoquarks and T-odd Quarks in the Acoplanar Jet Topology using 2.5 ${\mathrm {fb}}{}^{-1}$ of ${{\mathit p}}{{\overline{\mathit p}}}$ Collision Data at $\sqrt {s }$ = 1.96$~$TeV
 ABAZOV 2008AN
PRL 101 241802 Search for Third Generation Scalar Leptoquarks Decaying into ${{\mathit \tau}}{{\mathit b}}$
 ABAZOV 2007J
PRL 99 061801 Search for Third-Generation Scalar Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABAZOV 2006A
PL B636 183 Search for Pair Production of Second Generation Scalar Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABAZOV 2006L
PL B640 230 Search for Scalar Leptoquarks in the Acoplanar Jet Topology in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABULENCIA 2006T
PR D73 051102 Search for Second-Generation Scalar Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABAZOV 2005H
PR D71 071104 Search for First-Generation Scalar Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ACOSTA 2005P
PR D72 051107 Search for First-Generation Scalar Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ACOSTA 2005I
PR D71 112001 Search for Scalar Leptoquark Pairs Decaying to ${{\mathit \nu}}{{\overline{\mathit \nu}}}{{\mathit q}}{{\overline{\mathit q}}}$ in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.96 TeV
 ABBIENDI 2003R
EPJ C31 281 Search for Pair Produced Leptoquarks in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Interactions at $\sqrt {s }$ $\approx{}$ 189 to 209 GeV
 ABAZOV 2002
PRL 88 191801 Search for Leptoquark Pairs Decaying to ${{\mathit \nu}}{{\mathit \nu}}{+}$ jets in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABAZOV 2001D
PR D64 092004 Search for First Generation Scalar and Vector Leptoquarks
 ABBIENDI 2000M
EPJ C13 15 Search for Pair-Produced Leptoquarks in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Interactions at $\sqrt {s }$ $\approx{}$ 183 GeV
 ABBOTT 2000C
PRL 84 2088 Search for Second Generation Leptoquark Pairs in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 AFFOLDER 2000K
PRL 85 2056 Search for Second and Third Generation Leptoquarks Including Production via Technicolor Interactions in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABBOTT 1999J
PRL 83 2896 Search for Second Generation Leptoquark Pairs Decaying to ${{\mathit \nu}_{{\mu}}}$ + jets in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABBOTT 1998J
PRL 81 38 Search for Charge 1/3 Third Generation Leptoquarks in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABBOTT 1998E
PRL 80 2051 Search for First Generation Scalar Leptoquark Pairs in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABE 1998S
PRL 81 4806 Search for Second Generation Leptoquarks in the Dimuon Plus Dijet Channel of ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 GROSS-PILCHER 1998
hep-ex/9810015 Combined Limits on first Generation Leptoquarks from the CDF and ${D0}$ Experiments
 ABE 1997X
PRL 79 4327 Search for First Generation Leptoquark Pair Production in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABE 1997F
PRL 78 2906 Search for Third Generation Leptoquarks in ${{\overline{\mathit p}}}{{\mathit p}}$ Collisions at $\sqrt {s }$ = 1.8 TeV
 ABREU 1993J
PL B316 620 Limits on the Production of Scalar Leptoquarks from ${{\mathit Z}^{0}}$ Decays at LEP
PRPL 216 253 Searches for New Particles in ${{\mathit Z}}$ Decays using the ALEPH Detector
PL B240 243 A Search for Leptoquark and Colored Lepton Pair Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilations at TRISTAN
ZPHY C36 15 Search for Leptoquarks and other New Particles with Lepton Hadron Signature in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Interactions
PR D66 112001 Search for MSUGRA in Single Electron Events with Jets and Large Missing Transverse Energy in ${{\mathit p}}{{\overline{\mathit p}}}$ Collisions at $\sqrt {s }$ = 1.8-TeV
PRL 103 231802 Direct Measurement of the $\mathit W$ Boson Width