We discuss the phenomenology of (1, 1)-mode adjoint scalars in the framework of two Universal Extra Dimensions. The Kaluza-Klein (KK) towers of these adjoint scalars arise in the 4-dimensional effective theory from the 6th component of the gauge fields after compactification. Adjoint scalars can have KK-number conserving as well as KK-number violating interactions. We calculate the KK-number violating operators involving these scalars and two Standard Model fields. Decay widths of these scalars into different channels have been estimated. We have also briefly discussed pair-production and single production of such scalars at the Large Hadron Collider. © 2008 Elsevier B.V. All rights reserved.

ANINDYA DATTA

Physics

K GHOSH

Fulltext

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

&nbsp;

The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

&nbsp;

It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Nuclear Physics B

We discuss the signatures, at the LHC, of the (1,0)-th Kaluza-Klein (KK) gluon and quarks in the framework of the two universal extra dimensional (2UED) model. Once produced, these particles typically suffer a cascade of decays terminating in the Dark Matter candidate apart from Standard Model particles. In this article, we are interested in focus on a particular signature of 2UED wherein the final state comprises of at least four jets in association with a hard photon and missing transverse energy. Several kinematic cuts are devised to enhance the signal to background ratio. Finally, as a road map to parameter determination at the LHC, we point out an interesting correlation between the peak position of the Meff distributions with the compactification radius R and the cut- off scale M s. © 2012 SISSA.

Journal of High Energy Physics

Exploring two universal extra dimensions at the CERN LHC

We discuss the collider signatures of electroweak (1,0)-mode excitations in the framework of two universal extra dimension (2UED) at the LHC and ILC. In general, pair production of electroweak (1,0)-mode particles of 2UED gives rise to multi lepton plus missing transverse momentum signal. Upto 1/R = 400 GeV 2-lepton plus missing transverse momentum signal and upto 1/R = 600 GeV 3-lepton plus missing transverse momentum signal stands over the 5σ standard deviation of the Standard Model background at the LHC with 100fb -1 integrated luminosity. At ILC we study single photon plus missing energy signal from the production of U(1) gauge boson in association with a U(1) spinless adjoint. With proper choice of beam polarization, signal strength is greater than 5σ standard deviation of the Standard Model background almost upto the kinematic limit of the collider. © 2009 SISSA.

Probing two universal extra dimension model with leptons and photons at the LHC and ILC

We discuss collider signatures of (1, 1)th Kaluza-Klein (KK) mode vector bosons in the framework of two universal extra dimension model, at a future e+ e- collider. Production of Bμ(1, 1) and W3 μ(1, 1), the (1, 1)th KK mode vector bosons, are considered in association with a hard photon. Without caring about the decay products of Bμ(1, 1) or W3 μ(1, 1), one can measure the masses of these particles just by looking at the photon energy distribution. Once produced Bμ(1, 1) (W3 μ(1, 1)) dominantly decays to a pair of jets or to a pair of top quarks. Thus we look for a pair of jets or a pair of top quarks in association with a photon. Upto the kinematic limit (with e+ e- center-of-mass energies of 0.5 TeV and 1 TeV) of the collider, signals from the Bμ(1, 1) production and decay in both the above mentioned channels are greater than the 5σ fluctuation of the Standard Model background with 500   f b-1 integrated luminosity. However, the number of events from W3 μ(1, 1) production and decay is smaller and its detection prospect is not very good. © 2008 Elsevier B.V. All rights reserved.

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Probing two universal extra dimensions at international linear collider

We study the power law running of gauge, Yukawa and quartic scalar couplings in the universal extra dimension scenario where the extra dimension is accessed by all the standard model fields. After compactifying on an S1 / Z2 orbifold, we compute one-loop contributions of the relevant Kaluza-Klein (KK) towers to the above couplings up to a cutoff scale Λ. Beyond the scale of inverse radius, once the KK states are excited, these couplings exhibit power law dependence on Λ. As a result of faster running, the gauge couplings tend to unify at a relatively low scale, and we choose our cutoff also around that scale. For example, for a radius R ∼ 1   TeV-1, the cutoff is around 30 TeV. We then examine the consequences of power law running on the triviality and vacuum stability bounds on the Higgs mass. We also comment that the supersymmetric extension of the scenario requires R-1 to be larger than ∼ 1010   GeV in order that the gauge couplings remain perturbative up to the scale where they tend to unify. © 2006 Elsevier B.V. All rights reserved.

Power law scaling in universal extra dimension scenarios

In the context of an universal extra-dimensional scenario, we consider production of the first Kaluza-Klein electron positron pair in an e +e- collider as a case-study for the future International Linear Collider. The Kaluza-Klein electron decays into a nearly degenerate Kaluza-Klein photon and a standard electron, the former carrying away missing energy. The Kaluza-Klein electron and photon states are heavy with their masses around the inverse radius of compactification, and their splitting is controlled by radiative corrections originating from bulk and brane-localised interactions. We look for the signal event e+e-+ large missing energy for √s=1 TeV and observe that with a few hundred fb -1 luminosity the signal will be readily detectable over the standard model background. We comment on how this signal may be distinguished from similar events from other new physics. © 2005 Elsevier B.V. All rights reserved.

Probing universal extra dimension at the International Linear Collider

In the minimal Universal Extra Dimension model, single production of n=2 gauge bosons provides a unique discriminating feature from supersymmetry. We discuss how the proposed International Linear Collider can act as a n=2 factory, much in the same vein as LEP. We also touch upon the potential of the γγ mode of the collider to study the production and the decay of an intermediate mass Higgs boson and its KK excitations.

Journal	Data powered by TypesetNuclear Physics B
Publisher	Data powered by TypesetELSEVIER SCIENCE BV
ISSN	0550-3213
Open Access	No