Limits on axion and light Higgs boson production in ϒ (1S) decays

Antreasyan, D.; Bartels, H. W.; Besset, D.; Bieler, C.; Bienlein, J. K.; Bizzeti, A.; Bloom, E. D.; Brock, I.; Brockmüller, K.; Cabenda, R.; Cartacci, A. M.; Cavalli‐Sforza, M.; Clare, R.; Compagnucci, A.; Conforto, G.; Cooper, S.; Cowan, R.; Coyne, D. G.; Engler, A.; Fairfield, K.; Folger, G.; Fridman, A.; Gaiser, D.; Gelphman, D.; Glaser, G.; Godfrey, G.; Graaf, K.J. de; Heimlich, F. H.; Heinsius, F. H.; Hofstadter, R.; Irion, J.; Jakubowski, Z.; Janßen, H.; Karch, K.; Keh, S.; Kiel, T.; Kilian, H. G.; Kirkbride, I.; Kloiber, T.; Kobel, M.; Koch, W.; König, A. C.; Königsmann, K.; Krämer, R. W.; Krüger, S.; Landi, G.; Lee, R.; Leffler, S.; Lekebusch, R.; Litke, A. M.; Lockman, W. S.; Lowe, S.; Lurz, B.; Marlow, D.; Marsiske, H.; Maschmann, W.; McBride, P.; Messing, F.; Metzger, W. J.; Meyer, H.; Monteleoni, B.; Muryn, B.; Nernst, R.; Niczyporuk, B.; Nowak, G.; Peck, C.; Pelfer, P. G.; Pollock, B.; Porter, F. C.; Prindle, D.; Ratoff, P. N.; Reidenbach, M.; Renger, B.; Rippich, C.; Scheer, M.; Schmitt, P.; Schotanus, J.; Schütte, J.; Schwarz, A. S.; Sievers, D.; Skwarnicki, T.; Stock, V.; Strauch, K.; Strohbusch, U.; Tompkins, J.; Trost, H. J.; Uitert, B. van; Walle, R. T. Van de; Vogel, H.; Voigt, A.F.; Volland, U.; Wachs, K.; Wacker, K.; Walk, W.; Wegener, H.; Williams, D.; Zschorsch, P.

doi:10.1016/0370-2693(90)90254-4

Cited by 28 publications

(10 citation statements)

References 26 publications

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“…When running on the Υ(3S), the effective cross section in Υ(3S) → π + π − Υ(1S) is 179 pb [20]. To limit Br(Υ → γa 1 ) < ∼ 10 −6 , 5.6 fb −1 /ǫ would need to be collected on the Υ(3S), where ǫ is the experimental efficiency for isolating the 5 For a CP-odd a that decays into non-interacting states, there are further constraints available from Crystal Ball and CLEO [17]; these only apply to the scenarios considered here if M 1 is reduced to a very small value (as possible without affecting EWSB fine tuning) so that a 1 → χ 0 1 χ 0 1 decays are significant. For example, at tan β = 10, our low fine-tuning scenarios with M 1 decreased to 3 GeV can yield m relevant events.…”

Section: Figmentioning

confidence: 99%

Probing next-to-minimal-supersymmetric models with minimal fine tuning by searching for decays of theΥto a lightCP-odd Higgs boson

2007

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Completely natural electroweak symmetry breaking is easily achieved in supersymmetric models if there is a SM-like Higgs boson, h, with m h < ∼ 100 GeV. In the minimal supersymmetric model, such an h decays mainly to bb and is ruled out by LEP constraints. However, if the MSSM Higgs sector is expanded so that h decays mainly to still lighter Higgs bosons, e.g. h → aa, with Br(h → aa) > 0.7, and if ma < 2m b , then the LEP constraints are satisfied. In this letter, we show that in the next-tominimal supersymmetric model the above h and a properties (for the lightest CP-even and CP-odd Higgs bosons, respectively) imply a lower bound on Br(Υ → γa) that dedicated runs at present (and future) B factories can explore.Low energy supersymmetry remains one of the most attractive solutions to the naturalness / hierarchy problem of the Standard Model (SM). However, the minimal supersymmetric model (MSSM), containing exactly two Higgs doublets, suffers from the "µ problem" and requires rather special parameter choices in order that the light Higgs mass is above LEP limits without electroweak symmetry breaking being "fine-tuned", i.e. highly sensitive to supersymmetry-breaking parameters chosen at the grand-unification scale. Both problems are easily solved by adding Higgs (super) fields to the MSSM. For generic SUSY parameters well-below the TeV scale, finetuning is absent [1] and a SM-like h is predicted with m h < ∼ 100 GeV. Such an h can avoid LEP limits on the tightly constrained e + e − → Z +b ′ s channel if Br(h → bb) is small by virtue of large Br(h → aa), where a is a new light (typically CP-odd) Higgs boson, and m a < 2m b so that a → bb is forbidden [2]. The perfect place to search for such an a is in Upsilon decays, Υ → γa. The simplest MSSM extension, the next-to-minimal supersymmetric model (NMSSM), naturally predicts that the lightest h and a, h 1 and a 1 , have all the right features [1,2,3,4,5]. In this letter, we show that large Br(h 1 → a 1 a 1 ) implies, at fixed m a1 , a lower bound on Br(Υ → γa 1 ) (from now on, Υ is the 1S resonance unless otherwise stated) that is typically within reach of present and future B factories.In the NMSSM, a light a 1 with substantial Br(h 1 → a 1 a 1 ) is a very natural possibility for m Z -scale soft parameters developed by renormalization group running starting from U (1) R symmetric GUT-scale soft parameters [5]. (See also [6,7] for discussions of the light a 1 scenario.) The fine-tuning-preferred m h1 ∼ 100 GeV (for tan β > ∼ f ew) gives perfect consistency with precision electroweak data and the reduced Br(h 1 → bb) ∼ 0.09 − 0.15 explains the ∼ 2.3σ excess at LEP in the Zbb channel at M bb ∼ 100 GeV. The motivation for this scenario is thus very strong.Hadron collider probes of the NMSSM Higgs sector are problematical. The h 1 → a 1 a 1 → 4τ (2m τ < m a1 < 2m b ) or 4 jets (m a1 < 2m τ ) signal is a very difficult one at the Tevatron and very possibly at the LHC [8,9,10,11]. Higgs discovery or, at the very least, certification of a marginal LHC Higgs signal will requi...

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Section: Figmentioning

confidence: 99%

Probing next-to-minimal-supersymmetric models with minimal fine tuning by searching for decays of theΥto a lightCP-odd Higgs boson

2007

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“…Such a boson could, in principle, effect a neutral current which would be purely vectorial in the simplest case of a single Higgs doublet. However At the trigger level, we demand that there be minimal activity in the trigger lines designed to fire if charged tracks are present (e = 98.8+0.1%) [14] and there be exactly one "high-energy" trigger bit set in the barrel calorimeter (i.e., deposited energy in a single trigger block exceeding 500 MeV). We designate E~a s the energy of the shower which fired this trigger bit.…”

Section: Introductionmentioning

confidence: 99%

Υ(1S)→γ+noninteracting particles

Balest¹,

Cho²,

Ford³

et al. 1995

Phys. Rev. D

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We consider the decay of T(1S) particles produced at CESR into a photon which is observed by the CLEO detector plus particles which are not seen. These could be real particles which fall outside of our acceptance, or particles which are noninteracting. We report the results of our search for the process T(lS) -+ p + "unseen" for photon energies )1 GeV, obtaining limits for the case where "unseen" is either a single particle or a particle-antiparticle pair. Our upper limits represent the highest sensitivity measurements for such decays to date.

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“…'s of two electroweak Higgs doublets h 1 and h 2 only, as in the simplest supersymmetric theories, these effective pseudoscalar couplings would be the same as those of a standard axion [3]. A situation that became, some time later, excluded by experimental results [19,20].…”

Section: )mentioning

confidence: 98%

“…A U boson decaying into LDM particles (or νν pairs) would remain undetected. From the experimental limits [19][20][21] …”

Section: )mentioning

confidence: 99%

Constraints on light dark matter andUbosons, fromψ,Υ,K+,
Fayet
¹

2006
Phys. Rev. D
125
0
138
0
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Following searches for photinos and very light gravitinos in invisible decays of ψ and Υ, we discuss new limits on Light Dark Matter and U bosons, from ψ and Υ decays, as well as rare decays of K + and invisible decays of π • , η and η ′ ... . The new limits involving the vector couplings of the U to quarks turn out, not surprisingly, to be much less restrictive than existing ones on axial couplings, from an axionlike behavior of a light U boson, tested in ψ → γ U, Υ → γ U and K + → π + U decays (or as compared to the limit from parityviolation in atomic physics, in the presence of an axial coupling to the electron). Altogether the hypothesis of light U bosons, and light dark matter particles, remains compatible with particle physics constraints, while allowing for the appropriate annihilation cross sections required, both at freeze-out (for the relic abundance) and nowadays (if e + from LDM annihilations are at the origin of the 511 keV line from the galactic bulge).

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Limits on axion and light Higgs boson production in ϒ (1S) decays

Cited by 28 publications

References 26 publications

Probing next-to-minimal-supersymmetric models with minimal fine tuning by searching for decays of theΥto a lightCP-odd Higgs boson

Probing next-to-minimal-supersymmetric models with minimal fine tuning by searching for decays of theΥto a lightCP-odd Higgs boson

Υ(1S)→γ+noninteracting particles

Constraints on light dark matter andUbosons, fromψ,Υ,K+,
Fayet
¹

2006
Phys. Rev. D
125
0
138
0
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Limits on axion and light Higgs boson production in ϒ (1S) decays

Cited by 28 publications

References 26 publications

Probing next-to-minimal-supersymmetric models with minimal fine tuning by searching for decays of theΥto a lightCP-odd Higgs boson

Probing next-to-minimal-supersymmetric models with minimal fine tuning by searching for decays of theΥto a lightCP-odd Higgs boson

Υ(1S)→γ+noninteracting particles

Constraints on light dark matter andUbosons, fromψ,Υ,K+,Fayet1 2006Phys. Rev. D12501380View full textAdd to dashboardCite

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Constraints on light dark matter andUbosons, fromψ,Υ,K+,
Fayet
¹

2006
Phys. Rev. D
125
0
138
0
View full text Add to dashboard Cite