Model for production and decay of a heavy lepton via electron plus photon mode

1981 ◽  
Vol 59 (11) ◽  
pp. 1780-1788
Author(s):  
L. Resnick
Keyword(s):  
Decay Width ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Higgs Field ◽  
Forward Direction ◽  
Mass Scale ◽  
Photon Exchange ◽  
Heavy Lepton ◽  
Photon Mode

A variant of the standard SU(2) × U(1) model is considered for the vertex e1e2γ, where e1 is the electron, e2 a heavy [Formula: see text] lepton, and γ the photon. The model mixes e1 and e2 via a scalar (weak isodoublet) field [Formula: see text] which has a mass scale [Formula: see text]. This is in addition to the usual Higgs field. The decay width for e2 → e1 + γ is calculated. The production cross section in the forward direction for e1 + p → e2 + p via one photon exchange is calculated, where p is the proton. Numerical estimates are made for some cases of experimental interest.

HEAVY LEPTON PAIR PRODUCTION FROM NEW Z’ RESONANCES

1987 ◽  
Vol 02 (04) ◽  
pp. 1189-1197
Author(s):  
J.L. Hewett ◽  
T.G. Rizzo
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Gauge Boson ◽  
Production Cross Section ◽  
Production Cross ◽  
Lepton Pair ◽  
Lepton Production ◽  
Heavy Lepton ◽  
Neutral Gauge Boson ◽  
Lepton Pair Production

We examine the possibility that heavy lepton pair production can be significantly enhanced by the existence of a new neutral gauge boson, Z’, at SSC energies. We find that in some models, the heavy lepton production cross section resulting from this mechanism exceeds that from production via other scenarios.

scholarly journals Systematic study of diphoton resonance at 750 GeV from sgoldstino

2016 ◽  
Vol 31 (26) ◽  
pp. 1650151 ◽  
Author(s):  
Ran Ding ◽  
Yizhou Fan ◽  
Li Huang ◽  
Chuang Li ◽  
Tianjun Li ◽  
...  
Keyword(s):  
Decay Width ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Vector Boson ◽  
Mass Difference ◽  
Hadron Collider ◽  
Gluon Fusion ◽  
Large Mass ◽  
Decay Length

The ATLAS and CMS Collaborations of the Large Hadron Collider (LHC) have reported an excess of events in diphoton channel with invariant mass of about 750 GeV. With low energy supersymmetry breaking, we systematically consider the sgoldstino scalar S as the new resonance, which is a linear combination of the CP-even scalar [Formula: see text] and CP-odd pseudoscalar [Formula: see text]. Because we show that [Formula: see text] and [Formula: see text] can be degenerated or have large mass splitting, we consider two cases for all the following three scenarios: (1) Single resonance, [Formula: see text] is the 750 GeV resonance decays to a pair of 1 GeV pseudoscalar [Formula: see text] with suitable decay length, these two [Formula: see text] decay into collimated pair of photons which cannot be distinguished at the LHC and may appear as diphotons instead of four photons. (2) Twin resonances, [Formula: see text] with a mass difference of about 40 GeV and both [Formula: see text] and [Formula: see text] decay into diphoton pairs. For productions, we consider three scenarios: (I) vector-boson fusion; (II) gluon–gluon fusion; (III) [Formula: see text] pair production. In all these scenarios with two kinds of resonances, we find the parameter space that satisfies the diphoton production cross-section from 3 to 13 fb and all the other experimental constraints. And we address the decay width as well. In particular, in the third scenario, we observe that the production cross-section is small but the decay width of [Formula: see text] or [Formula: see text] can be from 40 to 60 GeV. Even if the 750 GeV diphoton excesses were not confirmed by the ATLAS and CMS experiments, we point out that our proposal can be used to explain the current and future diphoton excesses.

SEARCH FOR SUPER-NARROW DIBARYON RESONANCES BY THE pd → pdX AND pd → ppX REACTIONS

2003 ◽  
Vol 18 (02n06) ◽  
pp. 410-413
Author(s):  
A. TAMII ◽  
M. HATANO ◽  
H. KATO ◽  
Y. MAEDA ◽  
T. SAITO ◽  
...  
Keyword(s):  
Decay Width ◽  
Cross Section ◽  
Production Cross Section ◽  
Nuclear Physics ◽  
Production Cross ◽  
Mass Region ◽  
Magnetic Spectrometer ◽  
Research Center ◽  
Free Condition ◽  
Upper Limits

Dibaryons which have a very narrow decay width, called super-narrow dibaryons, are searched for by the p+d scattering at Ep = 295 MeV . The experiment was carried out at the Research Center for Nuclear Physics employing a two-arm magnetic spectrometer. A good mass resolution of 0.95 MeV and background free condition have been achieved. No resonance has been observed in the mass region of 1896–1914 MeV. The upper limits of the dibaryon production cross section have been determined.

scholarly journals Pomeron-Pomeron Scattering

2019 ◽  
Vol 64 (8) ◽  
pp. 760 ◽  
Author(s):  
I. Szanyi ◽  
V. Svintozelskyi
Keyword(s):  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Forward Direction ◽  
Small Contribution ◽  
Double Diffraction ◽  
Quantum Numbers ◽  
Pomeron Trajectory ◽  
New Feature

The central exclusive diffractive (CED) production of meson resonances potentially is a factory producing new particles, in particular, a glueball. The produced resonances lie on trajectories with vacuum quantum numbers, essentially on the pomeron trajectory. A tower of resonance recurrences, the production cross-section, and the resonances widths are predicted. A new feature is the form of a non-linear pomeron trajectory, producing resonances (glueballs) with increasing widths. At LHC energies, in the nearly forward direction, the t-channel both in elastic, single, or double diffraction dissociations, as well as in CED, is dominated by the pomeron exchange (the role of secondary trajectories is negligible, however a small contribution from the odderon may be present).

NEW HEAVY LEPTON PAIR-PRODUCTION FROM Z′ RESONANCES AT HADRON COLLIDERS

1988 ◽  
Vol 03 (06) ◽  
pp. 589-597
Author(s):  
J.L. HEWETT ◽  
T.G. RIZZO
Keyword(s):  
Pair Production ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
Lepton Pair ◽  
Hadron Colliders ◽  
Heavy Lepton ◽  
Lepton Pair Production ◽  
Text Production ◽  
The Standard Model

We examine the possibility that heavy lepton (L) pair production can be significantly enhanced by the existence of a new neutral gauge boson Z′ in hadron collisions. We find that in several E6-type models, the [Formula: see text] production cross section far exceeds that expected in the standard model. This may allow for the observation of [Formula: see text] pairs above the large W+W− background.

scholarly journals DECAY WIDTH MODELING OF HIGGS BOSON WITHIN THDM MODEL

2021 ◽  
pp. 11-13
Author(s):  
T.V. Obikhod ◽  
E.A. Petrenko
Keyword(s):  
Higgs Boson ◽  
Decay Width ◽  
Cross Section ◽  
Production Cross Section ◽  
Production Cross ◽  
New Physics ◽  
Higgs Bosons ◽  
Beyond The Standard Model ◽  
The Standard Model

As part of the search for new physics beyond the Standard Model, we chose the determination of the Higgs boson decay width as one of the least experimentally determined values. The decay widths into the four fermions of the lightest and heaviest CP-even Higgs bosons of the THDM model were calculated, taking into account QCD and electroweak corrections in the NLO approximation. To achieve this goal, the program Monte Carlo Prophecy 4f with special scenarios of parameters, 7B1 and 5B1 were used. It was found that the decay width of the heavier CPeven Higgs boson H differs from HSM by 1227.93 times and changes to a negative value when deviating from the standard scenarios. Scale factors kZ2 and kW2 showed the predominance of the associated with Z boson production cross section of CP-even Higgs boson over the associated with W production cross section.

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