New bounds on leptoquarks
- 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), Vol. 71:9; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Pa
ANTI-B NEUTRAL MESONS
MIXING
ANTI-D NEUTRAL MESONS
ANTIKAONS NEUTRAL
B NEUTRAL MESONS
D NEUTRAL MESONS
KAONS NEUTRAL
COUPLING
ANTIKAONS
ANTIMATTER
ANTIPARTICLES
B MESONS
BEAUTY PARTICLES
BOSONS
CHARM PARTICLES
CHARMED MESONS
D MESONS
ELEMENTARY PARTICLES
HADRONS
KAONS
MATTER
MESONS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES
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