skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: On the spin and parity of a single-produced resonance at the LHC

Abstract

The experimental determination of the properties of the newly discovered boson at the Large Hadron Collider is currently the most crucial task in high energy physics. We show how information about the spin, parity, and, more generally, the tensor structure of the boson couplings can be obtained by studying angular and mass distributions of events in which the resonance decays to pairs of gauge bosons, $ZZ, WW$, and $$\gamma \gamma$$. A complete Monte Carlo simulation of the process $$pp \to X \to VV \to 4f$$ is performed and verified by comparing it to an analytic calculation of the decay amplitudes $$X \to VV \to 4f$$. Our studies account for all spin correlations and include general couplings of a spin $J=0,1,2$ resonance to Standard Model particles. We also discuss how to use angular and mass distributions of the resonance decay products for optimal background rejection. It is shown that by the end of the 8 TeV run of the LHC, it might be possible to separate extreme hypotheses of the spin and parity of the new boson with a confidence level of 99% or better for a wide range of models. We briefly discuss the feasibility of testing scenarios where the resonances is not a parity eigenstate.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1155815
Report Number(s):
FERMILAB-PUB-12-475-PPD; ANL-HEP-PR-12-62
Journal ID: ISSN 1550-7998; arXiv eprint number arXiv:1208.4018
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 86; Journal Issue: 9; Journal ID: ISSN 1550-7998
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Bolognesi, Sara, Gao, Yanyan, Gritsan, Andrei V., Melnikov, Kirill, Schulze, Markus, Tran, Nhan V., and Whitbeck, Andrew. On the spin and parity of a single-produced resonance at the LHC. United States: N. p., 2012. Web. doi:10.1103/PhysRevD.86.095031.
Bolognesi, Sara, Gao, Yanyan, Gritsan, Andrei V., Melnikov, Kirill, Schulze, Markus, Tran, Nhan V., & Whitbeck, Andrew. On the spin and parity of a single-produced resonance at the LHC. United States. doi:10.1103/PhysRevD.86.095031.
Bolognesi, Sara, Gao, Yanyan, Gritsan, Andrei V., Melnikov, Kirill, Schulze, Markus, Tran, Nhan V., and Whitbeck, Andrew. Thu . "On the spin and parity of a single-produced resonance at the LHC". United States. doi:10.1103/PhysRevD.86.095031. https://www.osti.gov/servlets/purl/1155815.
@article{osti_1155815,
title = {On the spin and parity of a single-produced resonance at the LHC},
author = {Bolognesi, Sara and Gao, Yanyan and Gritsan, Andrei V. and Melnikov, Kirill and Schulze, Markus and Tran, Nhan V. and Whitbeck, Andrew},
abstractNote = {The experimental determination of the properties of the newly discovered boson at the Large Hadron Collider is currently the most crucial task in high energy physics. We show how information about the spin, parity, and, more generally, the tensor structure of the boson couplings can be obtained by studying angular and mass distributions of events in which the resonance decays to pairs of gauge bosons, $ZZ, WW$, and $\gamma \gamma$. A complete Monte Carlo simulation of the process $pp \to X \to VV \to 4f$ is performed and verified by comparing it to an analytic calculation of the decay amplitudes $X \to VV \to 4f$. Our studies account for all spin correlations and include general couplings of a spin $J=0,1,2$ resonance to Standard Model particles. We also discuss how to use angular and mass distributions of the resonance decay products for optimal background rejection. It is shown that by the end of the 8 TeV run of the LHC, it might be possible to separate extreme hypotheses of the spin and parity of the new boson with a confidence level of 99% or better for a wide range of models. We briefly discuss the feasibility of testing scenarios where the resonances is not a parity eigenstate.},
doi = {10.1103/PhysRevD.86.095031},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
issn = {1550-7998},
number = 9,
volume = 86,
place = {United States},
year = {2012},
month = {11}
}