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Affolder, A. A.; Akimoto, H.; Akopian, A.; Albrow, M.; Amaral, P.; Amendolia, S. R.; Amidei, D.; Anikeev, K.; Antos̆, J.; Apollinari, G.; Arisawa, T.; Asakawa, T.; Ashmanskas, W.; Ataç, M.; Azfar, F.; Azzi, P.; Bacchetta, N.; Bailey, M. W.; Bailey, S.; arbaro, P. De; Barbaro‐Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Barone, M.; Bauer, G.; Bedeschi, F.; Belforte, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Bensinger, J. R.; Beretvas, A.; Berge, J. P.; Berryhill, J. W.; Bevensee, B.; Bhatti, A.; Binkley, M.; Bisello, D.; Blair, R. E.; Blocker, C.; Bloom, K.; Blumenfeld, B.; Blusk, S.; Bocci, A.; Bodek, A.; Bokhari, W.; Bolla, G.; Bonushkin, Y.; Borras, K.; Bortoletto, D.; Boudreau, J.; Brandl, A.; Brink, S. van den; Bromberg, C.; Brozović, M.; Bruner, N.; Buckley-Geer, E.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Byon-Wagner, A.; Byrum, K. L.; Campbell, M.; Carithers, W.; Carlson, J.; Carlsmith, D.; Cassada, J.; Castro, A.; Cauz, D.; Cerri, A.; Chan, A. W.; Chang, P. 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T.; Lai, N.; Lami, S.; Lammel, S.; Lamoureux, J. I.; Lancaster, M.; Latino, G.; Compte, Tom Le; Lee, A. M.; Leone, S.; Lewis, J. D.; Lindgren, M.; Liss, T. M.; Liu, J. B.; Liu, Y. C.; Lockyer, N. S.; Loken, J.; Loreti, M.; Lucchesi, D.; Lukens, P.; Lusin, S.; Lyons, L.; Lys, J.; Madrak, R.; Maeshima, K.; Maksimović, P.; Malferrari, L.; Mangano, M.; Mariotti, M.; Martignon, G.; Martín, A.; Matthews, J.; Mayer, J.; Mazzanti, P.; Farland, K. S. Mc; Intyre, P. Mc; Kigney, E. Mc; Mélèse, P.; Menguzzato, M.; Menzione, A.; Mesropian, C.; Miao, T.; Miller, R.; Miller, J. S.; Minato, H.; Miscetti, S.; Mishina, M.; Mitselmakher, G.; Moggi, N.; Moore, C. D.; Moore, E. F.; Moore, R.; Morita, Y.; Mukherjee, A.; Müller, Th.; Munar, A.; Murat, P.; Murgia, S.; Musy, M.; Nachtman, J.; Nahn, S.; Nakada, H.; Nakaya, T.; Nakano, I.; Nelson, Charles A.; Neuberger, D.; Newman-Holmes, C.; Ngan, C. Y.P.; Nicolaidi, P.; Huang, Niu; Nodulman, L.; Nomerotski, A.; Oh, S. 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D.; Wu, X.; Wyss, J.; Yagil, A.; Yao, W-M.; Yeh, G. P.; Yeh, P.; Yoh, J.; Yosef, C.; Yoshida, T.; Yu, I.; Yu, S. S.; Zanetti, A.; Zetti, F.; Cobal, M.; Bertolucci, B.; Bigongiari, C.; Zucchelli, S.

doi:10.1103/physrevlett.84.5273

Cited by 26 publications

(9 citation statements)

References 29 publications

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“…However, calculations of successful electroweak baryogenesis within the MSSM context seem to require sparticle mass spectra with m h < ∼ 120 GeV, and mt 1 < ∼ 125 GeV [34]. The latter requirement is difficult (though not impossible) to achieve in the MSSM, and is also partially excluded by collider searches for light top squarks [35]. We will not consider this possibility further.…”

Section: Leptogenesismentioning

confidence: 99%

Fine-tuning favors mixed axion/axino cold dark matter over neutralinos in the minimal supergravity model

Baer

Box

2010

Eur. Phys. J. C

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Over almost all of minimal supergravity (mSUGRA or CMSSM) model parameter space, there is a large overabundance of neutralino cold dark matter (CDM). We find that the allowed regions of mSUGRA parameter space which match the measured abundance of CDM in the universe are highly fine-tuned. If instead we invoke the Peccei-Quinn-Weinberg-Wilczek solution to the strong CP problem, then the SUSY CDM may consist of an axion/axino admixture with an axino mass of order the MeV scale, and where mixed axion/axino or mainly axion CDM seems preferred. In this case, fine-tuning of the relic density is typically much lower, showing that axion/axino CDM (aãCDM) is to be preferred in the paradigm model for SUSY phenomenology. For mSUGRA with aãCDM, quite different regions of parameter space are now DM-favored as compared to the case of neutralino DM. Thus, rather different SUSY signatures are expected at the LHC in the case of mSUGRA with aãCDM, as compared to mSUGRA with neutralino CDM.Keywords: Supersymmetry Phenomenology, Supersymmetric Standard Model, Dark Matter, Axions.where Ω = ρ/ρ c is the dark matter density relative to the closure density, and h is the scaled Hubble constant. No particle present in the Standard Model (SM) of particle physics has the correct properties to constitue the CDM, so some form of new physics is needed. It is compelling, however, that candidate CDM particles do emerge naturally from two theories which provide solutions to longstanding problems in particle physics.The first problem-known as the gauge hierarchy problem-arises due to quadratic divergences in the scalar sector of the SM. These divergences lead to scalar masses blowing up to the highest scale in the theory (e.g. in grand unified theories (GUTS), the GUT scale M GU T ≃ 2 × 10 16 GeV), unless an enormous fine-tuning of parameters is invoked. One solution to the gauge hierarchy problem occurs by introducing supersymmetry (SUSY) into the theory. The inclusion of softly broken SUSY leads to a cancellation of quadratic divergences between fermion and boson loops, so that only log divergences remain. The log divergence is soft enough that vastly different scales remain stable within a single effective theory. In SUSY theories, the lightest neutralino emerges as an excellent WIMP CDM candidate. Gravity-mediated SUSY breaking models (supergravity, or SUGRA) contain gravitinos with weak-scale masses. SUGRA models experience tension due to possible overproduction of gravitinos in the early universe, leading to an overabundance of CDM. In addition, gravitinos usually decay during or after Big Bang nucleosynthesis (BBN), and their energetic decay products may disrupt the successful calculations of light element abundances, which otherwise maintain good agreement with observation. This tension in SUGRA models is known as the gravitino problem.The second problem is the strong CP problem [2]. An elegant solution to the strong CP problem was proposed by Peccei and Quinn (PQ) many years ago [3]. The PQ solution automatically predicts the existence of...

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Section: Leptogenesismentioning

confidence: 99%

Fine-tuning favors mixed axion/axino cold dark matter over neutralinos in the minimal supergravity model

Baer

Box

2010

Eur. Phys. J. C

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show abstract

“…[20]. The latter requirement is difficult (though not impossible) to achieve in the MSSM, and is also partially excluded by collider searches for light top squarks [21]. We will not consider this possibility further.…”

Section: Leptogenesismentioning

confidence: 99%

Mainly axion cold dark matter in the minimal supergravity model

Baer

Box²,

Summy³

2009

J. High Energy Phys.

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We examine the minimal supergravity (mSUGRA) model under the assumption that the strong CP problem is solved by the Peccei-Quinn mechanism. In this case, the relic dark matter (DM) abundance consists of three components: i). cold axions, ii). warm axinos from neutralino decay, and iii). cold or warm thermally produced axinos. To sustain a high enough re-heat temperature (T R > ∼ 10 6 GeV) for many baryogenesis mechanisms to function, we find that the bulk of DM should consist of cold axions, while the admixture of cold and warm axinos should be rather slight, with a very light axino of mass ∼ 100 keV. For mSUGRA with mainly axion cold DM (CDM), the most DM-preferred parameter space regions are precisely those which are least preferred in the case of neutralino DM. Thus, rather different SUSY signatures are expected at the LHC in the case of mSUGRA with mainly axion CDM, as compared to mSUGRA with neutralino CDM.

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“…This search was in part motivated by apparent inconsistencies in the top mass measurements between different top decay channels observed in the early CDF and D0 Run II data [6]. Previous searches for top squark decayst 1 → bχ ± 1 [7] did not exclude any region in the SUSY parameter space.…”

mentioning

confidence: 99%

Search for Pair Production of Supersymmetric Top Quarks in Dilepton Events frompp¯Collisions ats=1.96 TeV

Aaltonen¹,

Adelman²,

Akimoto³

et al. 2010

Phys. Rev. Lett.

Self Cite

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We present the results of a search for pair production of the supersymmetric partner of the top quark (the top squark t{1}) decaying to a b quark and a chargino χ{1}{±} with a subsequent χ{1}{±} decay into a neutralino χ{1}{0}, lepton ℓ, and neutrino ν. Using a data sample corresponding to 2.7 fb{-1} of integrated luminosity of pp collisions at sqrt[s]=1.96 TeV collected by the CDF II detector, we reconstruct the mass of top squark candidate events and fit the observed mass spectrum to a combination of standard model processes and t{1}t{1} signal. We find no evidence for t{1}t{1} production and set 95% C.L. limits on the masses of the top squark and the neutralino for several values of the chargino mass and the branching ratio B(χ{1}{±}→χ{1}{0}ℓ{±}ν).

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Search for Scalar Top Quark Production inpp¯Collisions ats=<

Cited by 26 publications

References 29 publications

Fine-tuning favors mixed axion/axino cold dark matter over neutralinos in the minimal supergravity model

Fine-tuning favors mixed axion/axino cold dark matter over neutralinos in the minimal supergravity model

Mainly axion cold dark matter in the minimal supergravity model

Search for Pair Production of Supersymmetric Top Quarks in Dilepton Events frompp¯Collisions ats=1.96 TeV

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