New bounds on leptoquarks

Journal Article · Mon Aug 30 04:00:00 EDT 1993 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.71.1324· OSTI ID:6216202

Leurer, M ^[1]

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1. Department of Nuclear Physics, The Weizmann Institute, Rehovot 76100 (Israel)

We derive new bounds on scalar leptoquark couplings from [ital K][sup 0]-[ital [bar K]][sup 0], [ital D][sup 0]-[ital [bar D]][sup 0], and [ital B][sup 0]-[ital [bar B]][sup 0] mixing. Although leptoquarks contribute to these processes only at one loop, their contribution is large, due to the lack of Glashow-Iliopoulos-Maiani cancelation. Our bounds have two important features: (i) They bound [ital g][sup 4]/[ital M][sup 2], in contrast to the hitherto known bounds on [ital g][sup 2]/[ital M][sup 2], and are consequently stronger at high masses. (ii) The bound from [ital D][sup 0-][ital [bar D]0] mixing is the first flavor changing neutral current bound in the up sector for chirally coupled leptoquarks, and is similar in strength to the [ital K][sup 0-][ital [bar K]0] and [ital B][sup 0-][ital [bar B]0] bounds. Together, these bounds strongly constrain any leptoquark that couples to left-handed quarks.

• OSTI ID: 6216202
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 71:9; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

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662420 -- Properties of Mesons & Meson Resonances-- (1992-)
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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTI-B NEUTRAL MESONS
ANTI-D NEUTRAL MESONS
ANTIKAONS
ANTIKAONS NEUTRAL
ANTIMATTER
ANTIPARTICLES
B MESONS
B NEUTRAL MESONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED MESONS
COUPLING
D MESONS
D NEUTRAL MESONS
ELEMENTARY PARTICLES
HADRONS
KAONS
KAONS NEUTRAL
MATTER
MESONS
MIXING
PSEUDOSCALAR MESONS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
STRANGE MESONS
STRANGE PARTICLES