Search for the neutral Higgs bosons of the MSSM and other two-doublet models

Décamp, D.; Deschizeaux, B.; Goy, C.; Lees, J. P.; Minard, M.-N.; Ajaltouni, Z.; Bardadin-Otwinowska, M.; Falvard, A.; Fellous, R. El; Harvey, J.; Henrard, P.; Jousset, J.; Michel, B.; Montret, Jean-Claude; Pallin, D.; Perret, P.; Proriol, J.; Prulhière, F.; Stimpfl, G.; Badier, J.; Blondel, A.; Bonneaud, G. R.; Bourotte, J.; Braems, F.; Brient, J. C.; Fouque, G.; Gamess, A.; Guirlet, R.; Orteu, S.; Rosowsky, A.; Rougé, A.; Rumpf, M.; Tanaka, R.; Videau, H.; Albanèse, J.P.; Aubert, J.J.; Benchouk, C.; Bernard, Véronique; Bonissent, A.; Courvoisier, D.; Etienne, F.; Papalexiou, S.; Payre, P.; Pietrzyk, B.; Qian, Z.; Bertín, V.; Boucrot, J.; Callot, O.; Chen, X.; Cordier, A.; Davier, M.; Ganis, G.; Grivaz, J.-F.; Heusse, P.; Janot, P.; Kim, D.W.; Diberder, F. Le; Lefrançois, J.; Lutz, A. M.; Veillet, J. J.; Videau, I.; Zhang, Zhen; Zomer, F.; Bloch-Devaux, B.; Colas, P.; Klopfenstein, C.; Locci, E.; Loucatos, S.; Monnier, E.; Pérez, P.; Perlas, J. A.; Perrier, Frédéric; Rander, J.; Renardy, J. F.; Roussarie, A.; Schuller, J. P.; Schwindling, J.; Vallage, B.

doi:10.1016/0370-2693(91)90083-3

Cited by 35 publications

(14 citation statements)

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“…We obtain as our final measurement: Za = 0.121 ± 0.017 + 0.006, which is in agreement with the measurements from counting and the four-dimensional fit, as well as with our previous measurement [7] and measurements from other LEP experiments [9,10 ].…”

Section: The Factorized Fit Methodssupporting

confidence: 78%

“…X B = J~X~ + f~s, whereX~ andXs are the mixing parameters and J~ and f~ are the production fractions ofB ° and B ° mesons. Previous measurements of the X 8 parameter have been made at proton colliders [1][2][3] and at e+e -colliders at the T(4S) [4][5][6] as well as at the Z ° [7][8][9][10]. At the Y(4S) no Bs ° mesons are produced, thus allowing a direct measurement of X dIn a previous paper the L3 Collaboration reported a measurement ofB°-B ° mixing [ 7 ].…”

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confidence: 99%

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An improved measurement of BO-O mixing in ZO decays

et al. 1992

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An improved measurement of B0 -anti-B0 mixing in Z0 decaysAdeva, B.; Adriani, O.; Aguilar-Benitez, M.; Ahlen, S.P.; Akbari, H.; Alcaraz, J.; Aloisio, A.; Alverson, G.; Linde, F.L. Published in:Physics Letters B DOI:10.1016/0370-2693(92)91119-T Link to publication Citation for published version (APA):Adeva, B., Adriani, O., Aguilar-Benitez, M., Ahlen, S. P., Akbari, H., Alcaraz, J., ... Linde, F. L. (1992). An improved measurement of B0 -anti-B0 mixing in Z0 decays. Physics Letters B, 288, 395-403. DOI: 10.1016/0370-2693 91119-T General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 12 May 2018Physics Letters B 288 (1992) A more precise determination of the B°-B ° mixing parameter in Z ° decays based on a fourfold increase in statistics has been made using the 1990 and t99t L3 data. The analysis of the dilepton events, rnuons and electrons, gives: Za = 0.121 + 0.017 (stat) :t: 0.006 (sys). Using the value Of Xd measured at the "f(4S) we derive the following limit for Zs: Zs > 0.16 (90% CL).

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Section: The Factorized Fit Methodssupporting

confidence: 78%

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confidence: 99%

An improved measurement of BO-O mixing in ZO decays

et al. 1992

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“…To determine Ab6 and Ace, we perform a maximum likelihood fit to the single lepton and dilepton p and PT spectra. Similar analyses have previously been performed with lower statistics [4][5][6][7][8].…”

Section: Ai2viaisupporting

confidence: 62%

Measurement of the forward-backward asymmetries at the Z0 resonance

Adriani¹,

Aguilar-Benı́tez²,

Ahlen³

et al. 1992

Physics Letters B

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General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Download date: 10 May 2018Physics Letters B 292 (1992) We have measured the forward-backward asymmetry in e + e----, bl~ and e + e-~ c~ processes using hadronic events containing muons or electrons. The data sample corresponds to 410 000 hadronic decays of the Z °. From a fit to the single lepton and dilepton p and Pr spectra, we determine Ab6 = 0.086 + 0.0154-0.007 and Ace = 0.083 + 0.038 + 0.027 at the effective center-of-mass energy qq = 91.24 GeV. These measurements yield a value of the electroweak mixing angle sin 2 0w = 0.2336 + 0.0029.

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“…This might have been feasible for light σt 1 and light h at the tevatron collider. Unfortunately the lower bound on m h from Higgs searches at LEP [45] excludes this possibility for σt 1 light enough to be produced at the tevatron. The τ + τ + τ − τ − SM background is much larger at supercollider energies, making it considerably more difficult to observe a σt 1 signal in this channel.…”

Section: ) Signals For Stoponium Productionmentioning

confidence: 99%

“…‡ It does affect the size of the region in the top left corner where the LEP Higgs bound [45] is violated.…”

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confidence: 99%

Production and decay of scalar top squarkonium bound states

1994

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In this paper we discuss possible signatures for the production of scalart 1t * 1 (stoponium) bound states σt 1 at hadron colliders, wheret 1 is the lighter scalar top eigenstate. We first study the decay of σt 1 ; explicit expressions are given for all potentially important decay modes. Ift 1 has unsuppressed two-body decays, they will always overwhelm the annihilation decays of σt 1. Among the latter, we find that usually either the gg or hh final state dominates, depending on the size of the off-diagonal entry of the stop mass matrix; h is the lighter neutral scalar Higgs boson of the minimal supersymmetric model. If m σt happens to be close to the mass of one of the neutral scalar Higgs bosons, QQ final states dominate (Q = b or t). W + W − and ZZ final states are subdominant. We argue that σt 1 → γγ decays offer the best signal for stoponium production at hadron colliders. The tevatron should be able to close the light stop window left open by LEP searches, but its mass reach is limited to m σt ≤ 90 GeV. In contrast, at the LHC one should ultimately be able to probe the region m σt ≤ 700 GeV, if the hh partial width is not too large. We also comment on the feasibility of searching for σt 1 production at hadron colliders in the ZZ, Zγ and τ + τ + τ − τ − final states, and briefly mention σt 1 production at γγ colliders. * Heisenberg Fellow † E-mail: NOJIRIN@JPNKEKVX 1) IntroductionAlthough the Standard Model (SM) of Particle Physics [1] has so far passed all experimental tests, it has long been known [2] to be technically unnatural: Nothing protects the mass of the Higgs boson, and hence the scale of electroweak symmetry breaking, from large (quadratically divergent) radiative corrections which "naturally" push it up to the Planck scale or the scale M X of Grand Unified Theories (GUTs). The probably most elegant solution [3] of this problem is the introduction of N = 1 supersymmetry (SUSY) [4]. In supersymmetric theories corrections to the mass of the Higgs boson from loops involving SM particles are automatically cancelled by loops involving their superpartners. The cancellation is not perfect since supersymmetry has to be broken; naturalness arguments then suggest that the scale of SUSY breaking should not (much) exceed 1 TeV.So far searches for the direct production of superparticles (sparticles) in collider experiments have not been successful. However, the lower limits on their masses that can be inferred from these searches are only around 120 GeV for most strongly interacting sparticles [5], and under 50 GeV for all other sparticles [6]. This leaves a wide region to be explored by present and future experiments, and much work in that direction has already been done [4,7].Meanwhile various indirect (loop) effects due to supersymmetric particles have been investigated. A by now well-known result [8] is that the introduction of supersymmetry allows for a beautiful unification of all three gauge couplings of the SM at scale M X ≃ 10 16 GeV. In contrast, nonsupersymmetric theories can be unified on...

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Search for the neutral Higgs bosons of the MSSM and other two-doublet models

Cited by 35 publications

References 14 publications

An improved measurement of BO-O mixing in ZO decays

An improved measurement of BO-O mixing in ZO decays

Measurement of the forward-backward asymmetries at the Z0 resonance

Production and decay of scalar top squarkonium bound states

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