pdgLive

Lepton-flavor violation

$> 0.49$

¹⁶

SCHAEL

ALEP

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$

¹⁷

SMIRNOV

RVUE

${{\mathit K}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit B}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \tau}}$

¹⁸

2005

ZEUS

Lepton-flavor violation

$>1.7$

¹⁹

First generation

$> 46$

²⁰

CHANG

BELL

Pati-Salam type

²¹

2002

ZEUS

Repl. by CHEKANOV 2005A

$>1.7$

²²

CHEUNG

2001

RVUE

First generation

$>0.39$

²³

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\mathit q}}$

$>1.5$

²⁴

First generation

$>0.2$

²⁵

BARATE

ALEP

Repl. by SCHAEL 2007A

²⁶

BARGER

RVUE

${}^{}\mathrm {Cs}$

²⁷

GABRIELLI

RVUE

Lepton flavor violation

$>0.74$

²⁸

ZARNECKI

RVUE

$\mathit S_{1}$ leptoquark

²⁹

ABBIENDI

1999

OPAL

$>19.3$

³⁰

ABE

1998

CDF

${{\mathit B}_{{s}}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}$ , Pati-Salam type

³¹

1998

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$

³²

ACKERSTAFF

1998

OPAL

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ , ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$

$>0.76$

³³

DEANDREA

RVUE

${{\widetilde{\mathit R}}_{{2}}}$ leptoquark

³⁴

DERRICK

ZEUS

Lepton-flavor violation

³⁵

GROSSMAN

RVUE

${{\mathit B}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ (X)

³⁶

JADACH

RVUE

${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$

$>1200$

³⁷

1995

RVUE

Pati-Salam type

³⁸

MIZUKOSHI

1995

RVUE

Third generation scalar leptoquark

$>0.3$

³⁹

BHATTACHARYYA

RVUE

Spin-0 leptoquark coupled to ${{\overline{\mathit e}}_{{R}}}{{\mathit t}_{{L}}}$

⁴⁰

DAVIDSON

RVUE

$>18$

⁴¹

RVUE

Pati-Salam type

$>0.43$

⁴²

RVUE

First generation spin-1 leptoquark

$>0.44$

⁴²

RVUE

First generation spin-0 leptoquark

⁴³

MAHANTA

RVUE

$\mathit P$ and $\mathit T$ violation

$>1$

⁴⁴

SHANKER

1982

RVUE

Nonchiral spin-0 leptoquark

$>125$

⁴⁴

SHANKER

1982

RVUE

Nonchiral spin-1 leptoquark

CRIVELLIN 2021A set limits on coupling strengths of scalar and vector leptoquarks using ${{\mathit K}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \nu}}{{\mathit \nu}}$ , ${{\mathit K}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit e}^{+}}{{\mathit e}^{-}}$ , ${{\mathit K}^{0}}−{{\overline{\mathit K}}^{0}}$ and ${{\mathit D}^{0}}−{{\overline{\mathit D}}^{0}}$ mixings, and weak neutral current measurements. See their Fig. 2 and Fig. 3 for the limits in mass-coupling plane.

AEBISCHER 2020 explain the ${{\mathit B}}$ decay anomalies using four-fermion operator Wilson coefficents. See their Table 1. These Wilson coefficients may be generated by a ${{\mathit U}_{{1}}}$ vector leptoquark with ${{\mathit U}_{{1}}}$ transforming as (3,1)$_{2/3}$ under the SM gauge group. See their Figures 6, 7, 8 for the regions of the LQ parameter space which explains the ${{\mathit B}}$ anomalies and avoids the indirect low energy constraints.

DEPPISCH 2020 limits on the lepton-number-violating higher-dimensional-operators are derived from ${{\mathit K}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \nu}}{{\mathit \nu}}$ in the standard model effective field theory. These higher-dimensional-operators may be induced from leptoquark-exchange diagrams.

⁴

ABRAMOWICZ 2019 obtain a limit on $\lambda /{{\mathit M}_{{LQ}}}$ $>$ 1.16 TeV${}^{-1}$ for weak isotriplet spin-0 leptoquark ${{\mathit S}_{{1}}^{L}}$. We obtain the limit quoted above by converting the limit on $\lambda /{{\mathit M}_{{LQ}}}$ for ${{\mathit S}_{{1}}^{L}}$ assuming $\lambda $ = $\sqrt {4 \pi }$. See their Table 5 for the limits of leptoquarks with different quantum numbers. These limits are derived from bounds of ${{\mathit e}}{{\mathit q}}$ contact interactions.

⁵	MANDAL 2019 give bounds on leptoquarks from ${{\mathit \tau}}$-decays, leptonic dipole moments, lepton-flavor-violating processes, and ${{\mathit K}}$ decays.

⁶

ZHANG 2018A give bounds on leptoquark induced four-fermion interactions from ${{\mathit D}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \ell}}{{\mathit \nu}}$ . The authors inform us that the shape parameter of the vector form factor in both the abstract and the conclusions of ZHANG 2018A should be $\mathit r_{+1}$ = $2.16$ $\pm0.07$ rather than $\pm0.007$. The numbers listed in their Table 7 are correct.

⁷	BARRANCO 2016 give bounds on leptoquark induced four-fermion interactions from ${{\mathit D}}$ $\rightarrow$ ${{\mathit K}}{{\mathit \ell}}{{\mathit \nu}}$ and ${{\mathit D}_{{s}}}$ $\rightarrow$ ${{\mathit \ell}}{{\mathit \nu}}$ .

⁸

KUMAR 2016 gives bound on SU(2) singlet scalar leptoquark with chrge $−$1/3 from ${{\mathit K}^{0}}−{{\overline{\mathit K}}^{0}}$ mixing, ${{\mathit K}}$ $\rightarrow$ ${{\mathit \pi}}{{\mathit \nu}}{{\overline{\mathit \nu}}}$ , ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ , and ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit \mu}^{\pm}}{{\mathit e}^{\mp}}$ decays.

⁹	BESSAA 2015 obtain limit on leptoquark induced four-fermion interactions from the ATLAS and CMS limit on the ${{\overline{\mathit q}}}{{\mathit q}}{{\overline{\mathit e}}}{{\mathit e}}$ contact interactions.

¹⁰	SAHOO 2015A obtain limit on leptoquark induced four-fermion interactions from ${{\mathit B}}$ $_{s,d}$ $\rightarrow$ ${{\mathit \mu}^{+}}{{\mathit \mu}^{-}}$ for $\lambda $ $\simeq{}$ $\mathit O$(1).

¹¹	SAKAKI 2013 explain the ${{\mathit B}}$ $\rightarrow$ ${{\mathit D}^{(*)}}{{\mathit \tau}}{{\overline{\mathit \nu}}}$ anomaly using Wilson coefficients of leptoquark-induced four-fermion operators.

¹²	KOSNIK 2012 obtains limits on leptoquark induced four-fermion interactions from ${{\mathit b}}$ $\rightarrow$ ${{\mathit s}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ decays.

¹³	AARON 2011C limit is for weak isotriplet spin-0 leptoquark at strong coupling ${{\mathit \lambda}}$ = $\sqrt {4\pi }$. For the limits of leptoquarks with different quantum numbers, see their Table 3. Limits are derived from bounds of ${{\mathit e}}{{\mathit q}}$ contact intereractions.

¹⁴	DORSNER 2011 give bounds on scalar, weak singlet, charge 4/3 leptoquark from ${{\mathit K}}$, ${{\mathit B}}$, ${{\mathit \tau}}$ decays, meson mixings, $\mathit LFV$, $\mathit g−$2 and ${{\mathit Z}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ .

¹⁵	AKTAS 2007A search for lepton-flavor violation in ${{\mathit e}}{{\mathit p}}$ collision. See their Tables $4 - 7$ for limits on lepton-flavor violating four-fermion interactions induced by various leptoquarks.

¹⁶	SCHAEL 2007A limit is for the weak-isoscalar spin-0 left-handed leptoquark with the coupling of electromagnetic strength. For the limits of leptoquarks with different quantum numbers, see their Table 35.

¹⁷	SMIRNOV 2007 obtains mass limits for the vector and scalar chiral leptoquark states from ${{\mathit K}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \mu}}$ , ${{\mathit B}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \tau}}$ decays.

¹⁸	CHEKANOV 2005 search for various leptoquarks with lepton-flavor violating couplings. See their Figs.6--10 and Tables 1--8 for detailed limits.

¹⁹	ADLOFF 2003 limit is for the weak isotriplet spin-0 leptoquark at strong coupling $\lambda =\sqrt {4{{\mathit \pi}} }$. For the limits of leptoquarks with different quantum numbers, see their Table$~$3. Limits are derived from bounds on ${{\mathit e}^{\pm}}{{\mathit q}}$ contact interactions.

²⁰	The bound is derived from B( ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}$ ) $<$ $1.7 \times 10^{-7}$.

²¹	CHEKANOV 2002 search for lepton-flavor violation in ${{\mathit e}}{{\mathit p}}$ collisions. See their Tables$~1 - 4$ for limits on lepton-flavor violating and four-fermion interactions induced by various leptoquarks.

²²	CHEUNG 2001B quoted limit is for a scalar, weak isoscalar, charge $−$1/3 leptoquark with a coupling of electromagnetic strength. The limit is derived from bounds on contact interactions in a global electroweak analysis. For the limits of leptoquarks with different quantum numbers, see Table$~$5.

²³	ACCIARRI 2000P limit is for the weak isoscalar spin-0 leptoquark with the coupling of electromagnetic strength. For the limits of leptoquarks with different quantum numbers, see their Table$~$4.

²⁴

ADLOFF 2000 limit is for the weak isotriplet spin-0 leptoquark at strong coupling, $\lambda =\sqrt {4\pi }$. For the limits of leptoquarks with different quantum numbers, see their Table$~$2. ADLOFF 2000 limits are from the $\mathit Q{}^{2}$ spectrum measurement of ${{\mathit e}^{+}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit e}^{+}}$ X.

²⁵

BARATE 2000I search for deviations in cross section and jet-charge asymmetry in ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\overline{\mathit q}}}{{\mathit q}}$ due to $\mathit t$-channel exchange of a leptoquark at $\sqrt {\mathit s }$=130 to 183 GeV. Limits for other scalar and vector leptoquarks are also given in their Table$~$22.

²⁶	BARGER 2000 explain the deviation of atomic parity violation in cesium atoms from prediction is explained by scalar leptoquark exchange.

²⁷	GABRIELLI 2000 calculate various process with lepton flavor violation in leptoquark models.

²⁸	ZARNECKI 2000 limit is derived from data of HERA, LEP, and Tevatron and from various low-energy data including atomic parity violation. Leptoquark coupling with electromagnetic strength is assumed.

²⁹	ABBIENDI 1999 limits are from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ cross section at $130 - 136$, $161 - 172$, 183 GeV. See their Fig.$~$8 and Fig.$~$9 for limits in mass-coupling plane.

³⁰

ABE 1998V quoted limit is from B( ${{\mathit B}_{{s}}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}$ )$<8.2 \times 10^{-6}$. ABE 1998V also obtain a similar limit on $\mathit M_{LQ}>20.4$ TeV from B( ${{\mathit B}_{{d}}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}$ )$<4.5 \times 10^{-6}$. Both bounds assume the non-canonical association of the ${{\mathit b}}~$quark with electrons or muons under SU(4).

³¹

ACCIARRI 1998J limit is from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ cross section at $\sqrt {\mathit s }$= $130 - 172$ GeV which can be affected by the ${{\mathit t}}-~$and ${{\mathit u}}$-channel exchanges of leptoquarks. See their Fig.$~$4 and Fig.$~$5 for limits in the mass-coupling plane.

³²

ACKERSTAFF 1998V limits are from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ and ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit b}}{{\overline{\mathit b}}}$ cross sections at $\sqrt {\mathit s }$ = $130 - 172$ GeV, which can be affected by the $\mathit t$- and $\mathit u$-channel exchanges of leptoquarks. See their Fig.$~$21 and Fig.$~$22 for limits of leptoquarks in mass-coupling plane.

³³

DEANDREA 1997 limit is for ${{\widetilde{\mathit R}}_{{2}}}$ leptoquark obtained from atomic parity violation (APV). The coupling of leptoquark is assumed to be electromagnetic strength. See Table$~$2 for limits of the four-fermion interactions induced by various scalar leptoquark exchange. DEANDREA 1997 combines APV limit and limits from Tevatron and HERA. See Fig.$~1 - 4$ for combined limits of leptoquark in mass-coupling plane.

³⁴	DERRICK 1997 search for lepton-flavor violation in ${{\mathit e}}{{\mathit p}}$ collision. See their Tables$~$2--5 for limits on lepton-flavor violating four-fermion interactions induced by various leptoquarks.

³⁵	GROSSMAN 1997 estimate the upper bounds on the branching fraction ${{\mathit B}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ (X) from the absence of the ${{\mathit B}}$ decay with large missing energy. These bounds can be used to constrain leptoquark induced four-fermion interactions.

³⁶

JADACH 1997 limit is from ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit q}}{{\overline{\mathit q}}}$ cross section at $\sqrt {\mathit s }=172.3$ GeV which can be affected by the ${{\mathit t}}$- and ${{\mathit u}}$-channel exchanges of leptoquarks. See their Fig.$~$1 for limits on vector leptoquarks in mass-coupling plane.

³⁷

KUZNETSOV 1995B use ${{\mathit \pi}}$, ${{\mathit K}}$, ${{\mathit B}}$, ${{\mathit \tau}}$ decays and ${{\mathit \mu}}{{\mathit e}}$ conversion and give a list of bounds on the leptoquark mass and the fermion mixing matrix in the Pati-Salam model. The quoted limit is from ${{\mathit K}_{{L}}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit e}}$ decay assuming zero mixing.

³⁸	MIZUKOSHI 1995 calculate the one-loop radiative correction to the ${{\mathit Z}}$-physics parameters in various scalar leptoquark models. See their Fig.$~$4 for the exclusion plot of third generation leptoquark models in mass-coupling plane.

³⁹

BHATTACHARYYA 1994 limit is from one-loop radiative correction to the leptonic decay width of the ${{\mathit Z}}$. ${\mathit m}_{{{\mathit H}}}$=250 GeV, ${{\mathit \alpha}_{{s}}}({\mathit m}_{{{\mathit Z}}})=0.12$, ${\mathit m}_{{{\mathit t}}}$=180 GeV, and the electroweak strength of leptoquark coupling are assumed. For leptoquark coupled to ${{\overline{\mathit e}}_{{L}}}{{\mathit t}_{{R}}}$ , ${{\overline{\mathit \mu}}}{{\mathit t}}$ , and ${{\overline{\mathit \tau}}}{{\mathit t}}$ , see Fig.$~$2 in BHATTACHARYYA 1994B erratum and Fig.$~$3.

⁴⁰	DAVIDSON 1994 gives an extensive list of the bounds on leptoquark-induced four-fermion interactions from ${{\mathit \pi}}$, ${{\mathit K}}$, ${{\mathit D}}$, ${{\mathit B}}$, ${{\mathit \mu}}$, ${{\mathit \tau}}$ decays and meson mixings, $\mathit etc$. See Table$~$15 of DAVIDSON 1994 for detail.

⁴¹	KUZNETSOV 1994 gives mixing independent bound of the Pati-Salam leptoquark from the cosmological limit on ${{\mathit \pi}^{0}}$ $\rightarrow$ ${{\overline{\mathit \nu}}}{{\mathit \nu}}$ .

⁴²

LEURER 1994 , LEURER 1994B limits are obtained from atomic parity violation and apply to any chiral leptoquark which couples to the first generation with electromagnetic strength. For a nonchiral leptoquark, universality in ${{\mathit \pi}}_{{{\mathit \ell}}2}$ decay provides a much more stringent bound.

⁴³	MAHANTA 1994 gives bounds of $\mathit P$- and $\mathit T$-violating scalar-leptoquark couplings from atomic and molecular experiments.

⁴⁴

From ( ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit e}}{{\mathit \nu}}$ )$/$( ${{\mathit \pi}}$ $\rightarrow$ ${{\mathit \mu}}{{\mathit \nu}}$ ) ratio. SHANKER 1982 assumes the leptoquark induced four-fermion coupling 4$\mathit g{}^{2}/\mathit M{}^{2}$ (${{\overline{\mathit \nu}}}_{\mathit eL}$ $\mathit u_{\mathit R}$) ( ${{\overline{\mathit d}}_{{L}}}{{\mathit e}_{{R}}}$ )with $\mathit g=0.004$ for spin-0 leptoquark and $\mathit g{}^{2}/\mathit M{}^{2}$ (${{\overline{\mathit \nu}}}_{\mathit eL}$ ${{\mathit \gamma}_{{\mu}}}{{\mathit u}_{{L}}}$ ) (${{\overline{\mathit d}}_{{R}}}$ ${{\mathit \gamma}}{}^{{{\mathit \mu}}}$ ${{\mathit e}_{{R}}}$ ) with $\mathit g≅0.6$ for spin-1 leptoquark.

References:

CRIVELLIN

2021A

PR D103 115023

Combined constraints on first generation leptoquarks

AEBISCHER

2020

EPJ C80 252

$B$-decay discrepancies after Moriond 2019

DEPPISCH

2020

JHEP 2012 186

Constraining lepton number violating interactions in rare kaon decays

ABRAMOWICZ

2019

PR D99 092006

Limits on contact interactions and leptoquarks at HERA

MANDAL

2019

JHEP 1912 089

Constraints on scalar leptoquarks from lepton and kaon physics

ZHANG

2018A

EPJ C78 695

Determinations of the form factors of semileptonic $D\rightarrow K$ decays and leptoquark constraints

BARRANCO

2016

JP G43 115004

Two Higgs Doublet Model and Leptoquarks Constraints from ${{\mathit D}}$ Meson Decays

KUMAR

2016

PR D94 014022

Constraints on a Scalar Leptoquark from the Kaon Sector

BESSAA

2015

EPJ C75 97

Constraints on $\mathit t$ -Channel Leptoquark Exchange from LHC Contact Interaction Searches

SAHOO

2015A

PR D91 094019

Scalar Leptoquarks and the Rare ${{\mathit B}}$ Meson Decays

SAKAKI

2013

PR D88 094012

Testing Leptoquark Models in ${{\overline{\mathit B}}}$ $\rightarrow$ ${{\mathit D}^{{(*)}}}{{\mathit \tau}}{{\overline{\mathit \nu}}}$

KOSNIK

2012

PR D86 055004

Model Independent Constraints on Leptoquarks from ${{\mathit b}}$ $\rightarrow$ ${{\mathit s}}{{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ Processes

AARON

2011C

PL B705 52

Search for Contact Interactions in ${{\mathit e}^{\pm}}{{\mathit p}}$ Collisions at HERA

DORSNER

2011

JHEP 1111 002

Limits on Scalar Leptoquark Interactions and Consequences for GUTs

AKTAS

2007A

EPJ C52 833

Search for Lepton Flavour Violation in ${{\mathit e}}{{\mathit p}}$ Collisions at HERA

SCHAEL

2007A

EPJ C49 411

Fermion Pair Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $189 - 209$ GeV and Constraints on Physics Beyond the Standard Model

SMIRNOV

MPL A22 2353

Mass Limits for Scalar and Gauge Leptoquarks from ${{\mathit K}_L^0}$ $\rightarrow$ ${{\mathit e}^{\mp}}{{\mathit \mu}^{\pm}}$ , ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit e}^{\mp}}{{\mathit \tau}^{\pm}}$ Decays

2005A

EPJ C44 463

Search for Lepton-Flavor Violation at HERA

PL B568 35

Search for New Physics in ${{\mathit e}^{\pm}}{{\mathit q}}$ Contact Interactions at HERA

CHANG

PR D68 111101

Search for ${{\mathit B}^{0}}$ $\rightarrow$ ${{\mathit \ell}^{+}}{{\mathit \ell}^{-}}$ at BELLE

2002

PR D65 092004

Search for Lepton Flavor Violation in ${{\mathit e}^{+}}{{\mathit p}}$ Collisions at HERA

CHEUNG

2001B

PL B517 167

Constraints on Electron Quark Contact Interactions and Implications to Models of Leptoquarks and Extra ${{\mathit Z}}$ Bosons

2000P

PL B489 81

Search for Manifestations of New Physics in Fermion Pair Production at LEP

PL B479 358

Search for Compositeness, Leptoquarks and Large Extra Dimensions in ${{\mathit e}}{\mathit {\mathit q}}$ Contact Interactions at HERA

BARATE

2000I

EPJ C12 183

Study of Fermion Pair Production in ${{\mathit e}^{+}}{{\mathit e}^{-}}$ Collisions at $130 - 183$ GeV

BARGER

PL B480 149

Atomic Parity Violation, Leptoquarks, and Contact Interactions

GABRIELLI

PR D62 055009

Model Independent Constraints on Leptoquarks from Rare Muon and ${{\mathit \tau}}$ Lepton Processes

ZARNECKI

EPJ C17 695

Leptoquark Signal from Global Analysis

ABBIENDI

1999

EPJ C6 1

Test of the Standard Model and Constraints on New Physics from Measurements of Fermion Pair Production at 183 GeV at LEP

ABE

1998V

PRL 81 5742

Search for the Decays ${{\mathit B}_{{s}}^{0}}$, ${{\mathit B}_{{d}}^{0}}$ $\rightarrow$ ${{\mathit e}^{\pm}}{{\mathit \mu}^{\mp}}$ and Pati-Salam Leptoquarks

1998J

PL B433 163

Search for New Physics Phenomena in Fermion Pair Production at LEP

ACKERSTAFF

1998V

EPJ C2 441

Tests of the Standard Model and Constraints on New Physics from Measurements of Fermion Pair Production at $130 - 172$ GeV at LEP

DEANDREA

PL B409 277

Atomic Parity Violation in Cesium and Implications for New Physics

DERRICK

ZPHY C73 613

Search for Lepton Flavor Violation in ${{\mathit e}}{{\mathit p}}$ Collisions at 300 GeV Center of Mass Energy

GROSSMAN

PR D55 2768

${{\mathit B}}$ $\rightarrow$ ${{\mathit \tau}^{+}}{{\mathit \tau}^{-}}$ (${{\mathit X}}$) Decays: First Constraints and Phenomenological Implications

JADACH

PL B408 281

${{\mathit e}^{+}}{{\mathit e}^{-}}$ Annihilation into Hadrons at LEP2 in the Presence of the Anomalous DESY Positron-Jet Event Phenomenon

1995B

PAN 58 2113

New Type of Mixing in the Minimal Quark $−$ Lepton Symmetry and a Lower Bound on the Vector Leptoquark Mass

MIZUKOSHI

1995

NP B443 20

Bounds on Scalar Leptoquarks from ${{\mathit Z}^{0}}$ Physics

BHATTACHARYYA

PL B336 100

Bounds on the Masses and Couplings of Leptoquarks from Leptonic Partial Widths of the ${{\mathit Z}^{0}}$

Also

PL B338 522 (erratum)

Erratum: BHATTACHARYYA 1994 Bounds on the Masses and Couplings of Leptoquarks from Leptonic Partial Widths of the ${{\mathit Z}}$

DAVIDSON

ZPHY C61 613

Model Independent Constraints on Leptoquarks from Rare Processes

PL B329 295

Vector Leptoquarks Could be Rather Light?

1994B

PR D49 333

A Comprehensive Study of Leptoquark Bounds

Also

PRL 71 1324

New Bounds on Leptoquarks

PR D50 536

Bounds on Vector Leptoquarks

MAHANTA