Aparna Dixit - Academia.edu (original) (raw)

Papers by Aparna Dixit

Research paper thumbnail of SU(3)C⊗SU(3)L⊗U(1)X gauge symmetry from SU(4)PS⊗SU(4)L+R

Physical Review D, 2005

We consider an extension of the standard model gauge symmetry to a local gauge group SU(3) C ⊗SU(... more We consider an extension of the standard model gauge symmetry to a local gauge group SU(3) C ⊗SU(3) L ⊗U(1) X which is a subgroup of SU(4) PS ⊗ SU(4) L+R .The symmetry breaking pattern is SU(4) SU(3) ⊗U(1) for both weak SU(4) L+R and strong Pati-Salam SU(4) PS group. The SU(3) C ⊗U(1) B-L ⊗SU(3) L ⊗U(1) Y1 (3-3-1-1) local gauge symmetry breaks to SU(3) C ⊗SU(3) L ⊗U(1) X and generates a 3-3-1 model with threegeneration, anomaly-free fermions which transform as bifundamentals of (3-3-1-1). The 3-3-1 model is of Pleitez-Frampton type but SU(3) L gauge bosons (B-L = 0) do not include bilepton gauge boson.The neutral gauge bosons include γ, Z, Z / and a fourth, heavy gauge boson Z // which decouples from rest but can decay to ordinary fermions. An analysis for two-body decays of neutral Z / gauge boson is presented .From Yukawa interactions, the masses of all exotic fermions are obtained in the TeV region .This restricts Z / decays to exotic fermions The Z / is also found to be leptophobic and decays mainly to quarks.

Research paper thumbnail of New physics, the cosmic ray spectrum knee, and pp cross section measurements

The European Physical Journal C, 2010

We explore the possibility that a new physics interaction can provide an explanation for the knee... more We explore the possibility that a new physics interaction can provide an explanation for the knee just above 10 6 GeV in the cosmic ray spectrum. We model the new physics modifications to the total proton-proton cross section with an incoherent term that allows for missing energy above the scale of new physics. We add the constraint that the new physics must also be consistent with published pp cross section measurements, using cosmic ray observations, an order of magnitude and more above the knee. We find that the rise in cross section required at energies above the knee is radical. The increase in cross section suggests that it may be more appropriate to treat the scattering process in the black disc limit at such high energies. In this case there may be no clean separation between the standard model and new physics contributions to the total cross section. We model the missing energy in this limit and find a good fit to the Tibet III cosmic ray flux data. We comment on testing the new physics proposal for the cosmic ray knee at the Large Hadron Collider.

Research paper thumbnail of Higgs Phenomenology in Supersymmetric SU (3) C x SU (3) L x U (1) X

Arxiv preprint hep-ph/0503078, 2005

We build a supersymmetric (SUSY) version of a recently proposed SU(3) C ⊗ SU(3) L ⊗ U(1) X model ... more We build a supersymmetric (SUSY) version of a recently proposed SU(3) C ⊗ SU(3) L ⊗ U(1) X model with heavy charged lepton and no bilepton gauge bosons. The model is an anomaly-free three-generation extension of the Standard Model with SU(3) L ⊗U(1) gauge symmetry. The scalar sector of the 3-3-1 model is analyzed to obtain mass spectra for neutral and charged Higgs bosons and their interactions with gauge bosons, quarks, leptons. The tree-level decay widths of Higgs bosons at TeV energies are presented.

Research paper thumbnail of Understanding Concepts of Physics through Virtual Labs during Lockdown

SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology

In the past years, virtual lab software applications seem to be adopted everywhere in the educati... more In the past years, virtual lab software applications seem to be adopted everywhere in the education world. Physical Labs play a vital role in the learning of physics. This study aims to introduce a systematic platform of experiments that are practically not possible to conduct in our physical labs. Here, we are presenting an overview of virtual labs in the field of relativity. Here, the user can experience real-time relativity (RTR) while sitting in the classrooms. Keeping in mind that students get the full liberty of committing mistakes, we are designing the experiment in the same manner. An evaluation system is being introduced to monitor the understanding of students in the respective lab. This evaluation system consists of pre and pro-test. These tests consist of multiple-choice questions (MCQs) and problems on the particular subject area. After successful completion of the experiment, Users get awarded a certificate to merit his/her performance. This paper presents the virtual ...

Research paper thumbnail of A Supersymmetric 3-3-1 model with MSSM-like Scalar Sector

We present a supersymmetric 3-3-1 model with exotic quarks and a charged lepton as an extension o... more We present a supersymmetric 3-3-1 model with exotic quarks and a charged lepton as an extension of the MSSM model with anomaly free three generations The scalar sector is studied with six triplet Higgses and the mass spectrum for light Higgs scalars are found to obey MSSM like predictions .The trilinear Higgs term in 3-3-1 is found to be consistent with the bilinear H u H d term of MSSM and play an important role in the tree-level mass spectrum of scalars.

Research paper thumbnail of SU(3)C⊗SU(3)L⊗U(1)X gauge symmetry from SU(4)PS⊗SU(4)L+R

Physical Review D, 2005

We consider an extension of the standard model gauge symmetry to a local gauge group SU(3) C ⊗SU(... more We consider an extension of the standard model gauge symmetry to a local gauge group SU(3) C ⊗SU(3) L ⊗U(1) X which is a subgroup of SU(4) PS ⊗ SU(4) L+R .The symmetry breaking pattern is SU(4) SU(3) ⊗U(1) for both weak SU(4) L+R and strong Pati-Salam SU(4) PS group. The SU(3) C ⊗U(1) B-L ⊗SU(3) L ⊗U(1) Y1 (3-3-1-1) local gauge symmetry breaks to SU(3) C ⊗SU(3) L ⊗U(1) X and generates a 3-3-1 model with threegeneration, anomaly-free fermions which transform as bifundamentals of (3-3-1-1). The 3-3-1 model is of Pleitez-Frampton type but SU(3) L gauge bosons (B-L = 0) do not include bilepton gauge boson.The neutral gauge bosons include γ, Z, Z / and a fourth, heavy gauge boson Z // which decouples from rest but can decay to ordinary fermions. An analysis for two-body decays of neutral Z / gauge boson is presented .From Yukawa interactions, the masses of all exotic fermions are obtained in the TeV region .This restricts Z / decays to exotic fermions The Z / is also found to be leptophobic and decays mainly to quarks.

Research paper thumbnail of New physics, the cosmic ray spectrum knee, and pp cross section measurements

The European Physical Journal C, 2010

We explore the possibility that a new physics interaction can provide an explanation for the knee... more We explore the possibility that a new physics interaction can provide an explanation for the knee just above 10 6 GeV in the cosmic ray spectrum. We model the new physics modifications to the total proton-proton cross section with an incoherent term that allows for missing energy above the scale of new physics. We add the constraint that the new physics must also be consistent with published pp cross section measurements, using cosmic ray observations, an order of magnitude and more above the knee. We find that the rise in cross section required at energies above the knee is radical. The increase in cross section suggests that it may be more appropriate to treat the scattering process in the black disc limit at such high energies. In this case there may be no clean separation between the standard model and new physics contributions to the total cross section. We model the missing energy in this limit and find a good fit to the Tibet III cosmic ray flux data. We comment on testing the new physics proposal for the cosmic ray knee at the Large Hadron Collider.

Research paper thumbnail of Higgs Phenomenology in Supersymmetric SU (3) C x SU (3) L x U (1) X

Arxiv preprint hep-ph/0503078, 2005

We build a supersymmetric (SUSY) version of a recently proposed SU(3) C ⊗ SU(3) L ⊗ U(1) X model ... more We build a supersymmetric (SUSY) version of a recently proposed SU(3) C ⊗ SU(3) L ⊗ U(1) X model with heavy charged lepton and no bilepton gauge bosons. The model is an anomaly-free three-generation extension of the Standard Model with SU(3) L ⊗U(1) gauge symmetry. The scalar sector of the 3-3-1 model is analyzed to obtain mass spectra for neutral and charged Higgs bosons and their interactions with gauge bosons, quarks, leptons. The tree-level decay widths of Higgs bosons at TeV energies are presented.

Research paper thumbnail of Understanding Concepts of Physics through Virtual Labs during Lockdown

SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology

In the past years, virtual lab software applications seem to be adopted everywhere in the educati... more In the past years, virtual lab software applications seem to be adopted everywhere in the education world. Physical Labs play a vital role in the learning of physics. This study aims to introduce a systematic platform of experiments that are practically not possible to conduct in our physical labs. Here, we are presenting an overview of virtual labs in the field of relativity. Here, the user can experience real-time relativity (RTR) while sitting in the classrooms. Keeping in mind that students get the full liberty of committing mistakes, we are designing the experiment in the same manner. An evaluation system is being introduced to monitor the understanding of students in the respective lab. This evaluation system consists of pre and pro-test. These tests consist of multiple-choice questions (MCQs) and problems on the particular subject area. After successful completion of the experiment, Users get awarded a certificate to merit his/her performance. This paper presents the virtual ...

Research paper thumbnail of A Supersymmetric 3-3-1 model with MSSM-like Scalar Sector

We present a supersymmetric 3-3-1 model with exotic quarks and a charged lepton as an extension o... more We present a supersymmetric 3-3-1 model with exotic quarks and a charged lepton as an extension of the MSSM model with anomaly free three generations The scalar sector is studied with six triplet Higgses and the mass spectrum for light Higgs scalars are found to obey MSSM like predictions .The trilinear Higgs term in 3-3-1 is found to be consistent with the bilinear H u H d term of MSSM and play an important role in the tree-level mass spectrum of scalars.