Search for Scalar Leptoquarks in the Acoplanar Jet Topology in P Anti-p Collisions at S**1/2
Search for Scalar Leptoquarks in the Acoplanar Jet Topology in P Anti-p Collisions at S**1/2

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Published: 2006

Total Pages: 8

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A search for leptoquarks has been performed in 310 pb−1 of data from p{bar p} collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider. The topology analyzed consists of acoplanar jets with missing transverse energy. The data show good agreement with standard model expectations, and a lower mass limit of 136 GeV has been set at the 95% C.L. for a scalar leptoquark decaying exclusively into a quark and a neutrino.

Search for Scalar Leptoquarks in the Acoplanar Jet Topology in P Anti-p Collisions at S**ư
Search for Scalar Leptoquarks in the Acoplanar Jet Topology in P Anti-p Collisions at S**ư

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Published: 2006

Total Pages: 8

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A search for leptoquarks has been performed in 310 pb−1 of data from p{bar p} collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider. The topology analyzed consists of acoplanar jets with missing transverse energy. The data show good agreement with standard model expectations, and a lower mass limit of 136 GeV has been set at the 95% C.L. for a scalar leptoquark decaying exclusively into a quark and a neutrino.

Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**(1/2)
Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**(1/2)

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Published: 2005

Total Pages: 8

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We report on a search for pair production of first-generation scalar leptoquarks (LQ) in pp collisions at √(s)=1.96 TeV using an integrated luminosity of 203 pb−1 collected at the Fermilab Tevatron collider by the CDF experiment. We observe no evidence for LQ production in the topologies arising from LQLQ→eqeq and LQLQ→eq?q, and derive 95% C.L. upper limits on the LQ production cross section. The results are combined with those obtained from a separately reported CDF search in the topology arising from LQLQ→?q?q and 95% C.L. lower limits on the LQ mass as a function of ?=BR(LQ→eq) are derived. The limits are 236, 205 and 145 GeV/c2 for ?=1, ?=0.5 and ?=0.1, respectively.

Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**1/2
Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**1/2

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Published: 2005

Total Pages: 9

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Results on a search for pair production of second generation scalar leptoquark in p{bar p} collisions at √s=1.96 TeV are reported. The data analyzed were collected by the CDF detector during the 2002-2003 Tevatron Run II and correspond to an integrated luminosity of 198 pb−1. Leptoquarks (LQ) are sought through their decay into (charged) leptons and quarks, with final state signatures represented by two muons and jets and one muon, large transverse missing energy and jets. We observe no evidence for LQ production and derive 95% C.L. upper limits on the LQ production cross sections as well as lower limits on their mass as a function of [beta], where [beta] is the branching fraction for LQ → [mu]q.

Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư
Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư

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Published: 2005

Total Pages: 9

ISBN-13:

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Results on a search for pair production of second generation scalar leptoquark in p{bar p} collisions at √s=1.96 TeV are reported. The data analyzed were collected by the CDF detector during the 2002-2003 Tevatron Run II and correspond to an integrated luminosity of 198 pb−1. Leptoquarks (LQ) are sought through their decay into (charged) leptons and quarks, with final state signatures represented by two muons and jets and one muon, large transverse missing energy and jets. We observe no evidence for LQ production and derive 95% C.L. upper limits on the LQ production cross sections as well as lower limits on their mass as a function of?, where? is the branching fraction for LQ →?q.

Search for Single Production of Scalar Leptoquarks in P Anti-p Collisions Decaying Into Muons and Quarks with the D0 Detector
Search for Single Production of Scalar Leptoquarks in P Anti-p Collisions Decaying Into Muons and Quarks with the D0 Detector

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Published: 2006

Total Pages: 8

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We report on a search for second generation leptoquarks (LQ2) which decay into a muon plus quark in p{bar p} collisions at a center-of-mass energy of √s = 1.96 TeV in the D0 detector using an integrated luminosity of about 300 pb−1. No evidence for a leptoquark signal is observed and an upper bound on the product of the cross section for single leptoquark production times branching fraction [beta] into a quark and a muon was determined for second generation scalar leptoquarks as a function of the leptoquark mass. This result has been combined with a previously published D0 search for leptoquark pair production to obtain leptoquark mass limits as a function of the leptoquark-muon-quark coupling, [lambda]. Assuming [lambda] = 1, lower limits on the mass of a second generation scalar leptoquark coupling to a u quark and a muon are m{sub LQ{sub 2}} > 274 GeV and m{sub LQ{sub 2}} > 226 GeV for [beta] = 1 and [beta] = 1/2, respectively.

Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư
Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư

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Published: 2004

Total Pages: 7

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The authors report on a search for pair production of first-generation scalar leptoquarks (LQ) in p{bar p} collisions at √s = 1.96 TeV using an integrated luminosity of 252 pb−1 collected at the Fermilab Tevatron collider by the D0 detector. They observe no evidence for LQ production in the topologies arising from LQ{ovr LQ} → eqeq and LQ{ovr LQ} → eqvq, and derive 95% C.L. lower limits on the LQ mass as a function of?, where? is the branching fraction for LQ → eq. The limits are 241 and 218 GeV/c2 for? = 1 and 0.5, respectively. These results are combined with those obtained by D0 at √s = 1.8 TeV, which increases these LQ mass limits to 256 and 234 GeV/c2.

Search for Pair Production of Second Generation Scalar Leptoquarks in P Anti-p Collisions at S**1/2
Search for Pair Production of Second Generation Scalar Leptoquarks in P Anti-p Collisions at S**1/2

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Published: 2006

Total Pages: 8

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The authors report on a search for the pair production of second generation scalar leptoquarks (LQ2) in p{bar p} collisions at the center-of-mass energy √s = 1.96 TeV, using data corresponding to an integrated luminosity of 294 ± 19 pb−1 recorded with the D0 detector. No evidence for a leptoquark signal in the LQ2 {ovr LQ}2 → [mu]q[mu]q channel has been observed, and upper bounds on the product of cross section times branching fraction were set. This yields lower mass limits of m{sub LQ2} > 247 GeV for [beta] = [Beta](LQ{sub 2} → [mu]q) = 1 and m{sub LQ{sub 2}} > 182 GeV for [beta] = 1/2. Combining these limits with previous D0 results, the lower limits on the mass of a second generation scalar leptoquark are m{sub LQ{sub 2}} > 251 GeV and m{sub LQ{sub 2}} > 204 GeV for [beta] = 1 and [beta] = 1/2, respectively.

Exotic Physics
Exotic Physics

Author: D. Acosta

Publisher:

Published: 2004

Total Pages:

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We report on a search for the pair production of scalar leptoquarks, LQ, using 191 pb{sup -1} of proton-antiproton collision data recorded by the CDF experiment during Run II of the Tevatron. The leptoquarks are sought via their decay into a neutrino and quark yielding missing transverse energy and several jets of large transverse energy. No evidence for leptoquark production is observed, and limits are set on {sigma}(p{bar p} {yields} LQ{ovr OQ}X {yields} v{bar v}q{bar q}X). Using a next-to-leading order theoretical prediction of the cross section for scalar leptoquark production, we exclude first-generation leptoquarks in the mass interval 78 to 117 GeV/c{sup 2} at the 95% confidence level for BR(LQ {yields} vq) = 100%.

Search for Scalar Leptoquarks in Pp Collisions at $\sqrt{s}$
Search for Scalar Leptoquarks in Pp Collisions at $\sqrt{s}$

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Published: 2016

Total Pages:

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An inclusive search for a new-physics signature of lepton-jet resonances has been performed by the ATLAS experiment. Scalar leptoquarks, pair-produced in pp collisions at $\sqrt{s}$ = 13 TeV at the large hadron collider, have been considered. An integrated luminosity of 3.2 fb-1, corresponding to the full 2015 dataset was used. First (second) generation leptoquarks were sought in events with two electrons (muons) and two or more jets. The observed event yield in each channel is consistent with Standard Model background expectations. The observed (expected) lower limits on the leptoquark mass at 95% confidence level are 1100 and 1050 GeV (1160 and 1040 GeV) for first and second generation leptoquarks, respectively, assuming a branching ratio into a charged lepton and a quark of 100%. Upper limits on the aforementioned branching ratio are also given as a function of leptoquark mass. In conclusion, compared with the results of earlier ATLAS searches, the sensitivity is increased for leptoquark masses above 860 GeV, and the observed exclusion limits confirm and extend the published results.