Search For New States Decaying Into J Psi Pi Pi With The Atlas Detector At The Large Hadron Collider

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Search For New States Decaying Into J Psi Pi Pi With The Atlas Detector At The Large Hadron Collider

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Author : Wei-Cheng Wong
language : en
Publisher:
Release Date : 2012

Search For New States Decaying Into J Psi Pi Pi With The Atlas Detector At The Large Hadron Collider written by Wei-Cheng Wong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Collisions (Nuclear physics) categories.

Using pp collision data collected at sqrt(s ) = 7 TeV in 2010 and 2011with the ATLAS detector (A Toroidal LHC ApparatuS), corresponding to an integrated luminosity of 2.44 fb-1 , the J/PsiPi+Pi- combinations have been studied. The selection criteria have been developed, the detection efficiency of the Xc (3872) signal has been evaluated, and the systematic errors have been identified. Both the Psi(2S ) and the Xc (3872) signals are observed in the J/PsiPi+Pi- mass spectrum. The detection of the charmonium-like X, Y, Zstates is feasible with the ATLAS detector at the Large Hadron Collider (LHC). Other than the Psi(2 S ) and the Xc (3872) signals, there is no evidence for any significant enhancement in the J/PsiPi+Pi- mass spectrum. This dissertation research establishes that ATLAS can detect Xc (3872) like new particles in the J/PsiPi+Pi- final state, and with current data sample, no new states have been observed in this study.

Government Reports Announcements Index

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Author :
language : en
Publisher:
Release Date : 1996-12

Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996-12 with Science categories.

Search For Charmonium States Decaying To J Psi Gamma Gamma Using Initial State Radiation Events

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Author : J. C. Chen
language : en
Publisher:
Release Date : 2006

Search For Charmonium States Decaying To J Psi Gamma Gamma Using Initial State Radiation Events written by J. C. Chen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

We study the processes e{sup +}e{sup -} {yields} (J/{psi}{gamma}{gamma}){gamma} and e{sup +}e{sup -} {yields} (J/{psi}{pi}{sup -}{pi}{sup +}){gamma} where the hard photon radiated from an initial e{sup +}e{sup -} collision with center-of-mass (CM) energy near 10.58 GeV is detected. In the final state J/{psi}{gamma}{gamma} we consider J/{psi}{pi}{sup 0}, J/{psi}{eta}, {chi}{sub c1}{gamma}, and {chi}c{sub 2}{gamma} candidates. The invariant mass of the hadronic final state defines the effective e{sup +}e{sup -} CM energy in each event, so these data can be compared with direct e{sup +}e{sup -} measurements. We report 90% CL upper limits for the integrated cross section times branching fractions of the J/{psi}{gamma}{gamma} channels in the Y (4260) mass region.

Physics At The J

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Author :
language : en
Publisher:
Release Date : 1984

Physics At The J written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.

Recent results on the J/psi, iota(1440), and theta(1690) from the Crystal Ball, DM2, and Mark III collaborations are presented together with preliminary results on charmonium states from the CERN-ISR R704 experiment. The J/psi two-body decays into a vector and a pseudoscalar meson are discussed; these results provide information about the quark content of the eta and eta' and are relevant to models in which these states are mixed with glueballs. New spin-parity determinations of the iota(1440) and theta(1690) are presented, as well as several recent branching ratio measurements including evidence for the decay theta(1690) ..-->.. ..pi ... pi..−. 18 references.

Observation Of The Narrow State X 3872 J Psi Pi Pi In Pbar P Collisions At S

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Author :
language : en
Publisher:
Release Date : 2004

Observation Of The Narrow State X 3872 J Psi Pi Pi In Pbar P Collisions At S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.

The authors report the observation of a narrow state decaying into J/???− and produced in 220 pb−1 of {bar p}p collisions at √s = 1.96 TeV in the CDF II experiment. They observe 730 ± 90 decays. The mass is measured to be 3871.3 ± 0.7(stat) ± 0.4(syst) MeV/c2, with an observed width consistent with the detector resolution. This is in agreement with the recent observation by the Belle Collaboration of the X(3872) meson.

Prins Almenjors Och Prinsessan Saras M Rkv Rdiga K Rlekshandel Fri Fvers Ttning Fr N Franskan Bo Tryckt Hos Johan C Frenckell 1799

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Author :
language : en
Publisher:
Release Date : 1799

Prins Almenjors Och Prinsessan Saras M Rkv Rdiga K Rlekshandel Fri Fvers Ttning Fr N Franskan Bo Tryckt Hos Johan C Frenckell 1799 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1799 with categories.

Search For The Xb And Other Hidden Beauty States In The Pi Pi Upsilon 1s Channel At Atlas

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Author :
language : en
Publisher:
Release Date : 2014

Search For The Xb And Other Hidden Beauty States In The Pi Pi Upsilon 1s Channel At Atlas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

This Letter presents a search for a hidden-beauty counterpart of the X(3872) in the mass ranges of 10.05-10.31 GeV and 10.40-11.00 GeV, in the channel Xb → [pi]+[pi]-[Upsilon] (1S)(→ [mu]+[mu]-), using 16.2 fb-1 of √s = 8 TeV pp collision data collected by the ATLAS detector at the LHC. No evidence for new narrow states is found, and upper limits are set on the product of the Xb cross section and branching fraction, relative to those of the [Upsilon](2S), at the 95% confidence level using the CLS approach. These limits range from 0.8% to 4.0%, depending on mass. For masses above 10.1 GeV, the expected upper limits from this analysis are the most restrictive to date. Searches for production of the [Upsilon] (13DJ), [Upsilon](10860), and [Upsilon](11020) states also reveal no significant signals.

Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a S

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Author :
language : en
Publisher:
Release Date : 2015

Search For Massive Supersymmetric Particles Decaying To Many Jets Using The Atlas Detector In Pp Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

Results of a search for decays of massive particles to fully hadronic final states are presented. This research uses 20.3 fb-1 of data collected by the ATLAS detector in √s = 8 TeV proton-proton collisions at the LHC. Signatures based on high jet multiplicities without requirements on the missing transverse momentum are used to search for R-parity-violating supersymmetric gluino pair production with subsequent decays to quarks. The analysis is performed using a requirement on the number of jets, in combination with separate requirements on the number of b-tagged jets, as well as a topological observable formed from the scalar sum of the mass values of large-radius jets in the event. Results are interpreted in the context of all possible branching ratios of direct gluino decays to various quark flavors. No significant deviation is observed from the expected Standard Model backgrounds estimated using jet counting as well as data-driven templates of the total-jet-mass spectra. Gluino pair decays to ten or more quarks via intermediate neutralinos are excluded for a gluino with mass m̃/supg 1TeV for a neutralino mass msubsup̃/supX/subsubsup01/sub = 500 GeV. Direct gluino decays to six quarks are excluded for mgsubsup̃/supg

Deutsche Grundkarte

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Author :
language : en
Publisher:
Release Date : 1989

Deutsche Grundkarte written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

Study Of B C J Psi D S And B C J Psi D S Decays In Pp Collisions At Square Root S

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022

Study Of B C J Psi D S And B C J Psi D S Decays In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.