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Can the diphoton enhancement at 750 GeV be due to a neutral technipion? | | Piotr Lebiedowicz
; Marta Luszczak
; Roman Pasechnik
; Antoni Szczurek
; | | Date: |
7 Apr 2016 | | Abstract: | We discuss a scenario in which the diphoton enhancement at $M_{gamma
gamma}$ = 750 GeV, observed by the ATLAS and CMS Collaborations, is a neutral
technipion $ ilde{pi}^0$. We consider two distinct minimal models for the
dynamical electroweak symmetry breaking. In a first one, two-flavor vector-like
technicolor (VTC) model, we assume that the two-photon fusion is a dominant
production mechanism. We include $gamma gamma o { ilde pi}^0$ and
production of technipion associated with one or two jets. All the considered
mechanisms give similar contributions. With the strong Yukawa
(technipion-techniquark) coupling $g_{TC}$ = 10 - 20 we obtain the measured
cross section of the "signal". With such values of $g_{TC}$ we get a relatively
small $Gamma_{
m tot}$. In a second approach, one-family walking technicolor
(WTC) model, the isoscalar technipion is produced dominantly via the
gluon-gluon fusion. We also discuss the size of the signal at lower energies
(LHC, Tevatron) for $gamma gamma$ (VTC) and jet-jet (WTC) final states and
check consistency with the existing experimental data. We predict a measurable
cross section for ${ ilde pi}^0$ production associated with one or two soft
jets. The technipion signal in both models is compared with the SM background
diphoton contributions. We observe the dominance of inelastic-inelastic
processes for $gamma gamma$ induced processes. In the VTC scenario, we
predict the signal cross section for purely exclusive $p p o p p gamma
gamma$ processes at $sqrt{s}$ = 13 TeV to be about 0.2 fb. Such a cross
section would be, however, difficult to measure with the planned integrated
luminosity. In all considered cases the signal is below the background or/and
below the threshold set by statistics. | | Source: | arXiv, 1604.2037 | | Services: | Forum | Review | PDF | Favorites | |
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