Cross Section Measurement Of The Process Gamma Gamma P Pbar In Untagged Events At Sqrt S
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Cross Section Measurement Of The Process Gamma Gamma P Pbar In Untagged Events At Sqrt S
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Author : Teresa Barillari
language : en
Publisher:
Release Date : 2001
Cross Section Measurement Of The Process Gamma Gamma P Pbar In Untagged Events At Sqrt S written by Teresa Barillari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Le collisioneur LEP au CERN est utilisé pour étudier les collisions de deux photons quasi-réels e+e−->e+e−[gamma gamma]->e+e−X. L'échantillon de données pour la réaction e+e−->e+e−[gamma gamma]->e+e− [p pbar] a été collecté par le détecteur OPAL à une énergie dans le centre de masse de [sqrt](s)=183 et 189 GeV. Le processus [gamma gamma]->[p pbar] permet de tester les prédictions fournies par QED et QCD. Les mesures de section efficace obtenues par OPAL couvrent une région du centre de masse de deux photons, "W", entre 2.15 GeV"W"3.95 GeV et l'angle polaire dans le centre de masse du système [gamma gamma]-[p pbar] est restreint à I(cos theta*)I
Cross Section Measurement Of The Process Gamma Gamma Pp In Untagged Events At Square Root S
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Author : Teresa Barillari
language : en
Publisher:
Release Date : 2001
Cross Section Measurement Of The Process Gamma Gamma Pp In Untagged Events At Square Root S written by Teresa Barillari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1984
American Doctoral Dissertations 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 Dissertation abstracts categories.
Measurement Of The Production Cross Section For Z Gamma To Nu Bar Nu Gamma In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of The Production Cross Section For Z Gamma To Nu Bar Nu Gamma In Pp Collisions At Sqrt 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 2013 with categories.
Z Gamma Cross Section Measurement Sigma Br Z Gamma In The Electron Channel For P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 1994
Z Gamma Cross Section Measurement Sigma Br Z Gamma In The Electron Channel For P Bar P Collisions At Sqrt 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 1994 with categories.
The Z+[gamma] cross-section x branching ratio in the electron channel has been measured using the inclusive Z data sample from the CDF '88-'89 collider run, for which the total integrated luminosity was 4.05 ± 0.28 pb-1.
Evidence For T Bar T Gamma Production And Measurement Of Sigma T Bar T Gamma
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Author :
language : en
Publisher:
Release Date : 2011
Evidence For T Bar T Gamma Production And Measurement Of Sigma T Bar T Gamma written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Using data corresponding to 6.0 fb−1 of p{bar p} collisions at √s = 1.96 TeV collected by the CDF II detector, we present a cross section measurement of top-quark pair production with an additional radiated photon, t{bar t}[gamma]. The events are selected by looking for a lepton (l), a photon ([gamma]), significant transverse momentum imbalance (E{sub T}), large total transverse energy, and three or more jets, with at least one identified as containing a b quark (b). The t{bar t}[gamma] sample requires the photon to have 10 GeV or more of transverse energy, and to be in the central region. Using an event selection optimized for the t{bar t}[gamma] candidate sample we measure the production cross section of t{bar t} ([sigma]{sub t{bar t}}), and the ratio of cross sections of the two samples. Control samples in the dilepton+photon and lepton+photon+E{sub T}, channels are constructed to aid in decay product identification and background measurements. We observe 30 t{bar t}[gamma] candidate events compared to the standard model expectation of 26.9 ± 3.4 events. We measure the t{bar t}[gamma] cross section ([sigma]{sub t{bar t}}) to be 0.18 ± 0.08 pb, and the ratio of [sigma]{sub t{bar t}[gamma]} to [sigma]{sub t{bar t}} to be 0.024 ± 0.009. Assuming no t{bar t}[gamma] production, we observe a probability of 0.0015 of the background events alone producing 30 events or more, corresponding to 3.0 standard deviations.
Measurement Of The Gamma Cross Section At D0 Using Dimuons
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Author :
language : en
Publisher:
Release Date : 2001
Measurement Of The Gamma Cross Section At D0 Using Dimuons written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
The D0 experiment has measured the[gamma] differential cross section in p[bar p] collisions at[radical]s= 1.8 TeV for[vert-bar]y[sup[gamma]][vert-bar]0.7. We find the measured cross section to be a factor of five larger than the O([alpha][sub s][sup 3]) QCD prediction for p[sub T][sup[gamma]] 5 GeV/c.
Measurement Of The Cross Section For Production Of Prompt Diphoton In P Pbar Collisions At Sqrt S
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Author : Yanwen Liu
language : en
Publisher:
Release Date : 2004
Measurement Of The Cross Section For Production Of Prompt Diphoton In P Pbar Collisions At Sqrt S written by Yanwen Liu 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.
La section efficace mesurée est en assez bon accord avec les différentes prédictions.
A Measurement Of The Differential Cross Section For The Reaction Gamma N To Pi P From Deuterium
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Author :
language : en
Publisher:
Release Date : 2009
A Measurement Of The Differential Cross Section For The Reaction Gamma N To Pi P From Deuterium written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
We report a measurement of the differential cross section for the $\gamma n \to \pi^- p$ process from the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles ($\theta_{c.m.}$) between 50$^\circ$ and 115$^\circ$. We confirm a previous indication of a broad enhancement around a c.m. energy ($\sqrt{s}$) of 2.2 GeV at $\theta_{c.m.}=90^\circ$ in the scaled differential cross section, $s^7 {\frac{d\sigma}{dt}}$. Our data show the angular dependence of this enhancement as the scaling region is approached in the kinematic region from 70$^\circ$ to 105$^\circ$.
Measurement Of The Z Gamma Nu Anti Nu Gamma Cross Section And Limits On Anomalous Z Z Gamma And Z Gamma Gamma Couplings In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2009
Measurement Of The Z Gamma Nu Anti Nu Gamma Cross Section And Limits On Anomalous Z Z Gamma And Z Gamma Gamma Couplings In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
We present the first observation of the Z[gamma] →[nu]{bar [nu]}[gamma] process at the Tevatron at 5.1 standard deviations significance, based on 3.6 fb−1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider at √s = 1.96 TeV. The measured Z[gamma] cross section multiplied by the branching fraction of Z → {nu}{bar {nu}} is 32 ± 9(stat. + syst.) ± 2(lumi.) fb for the photon E{sub T} > 90 GeV. It is in agreement with the standard model prediction of 39 ± 4 fb. We set the most restrictive limits on anomalous trilinear Z[gamma][gamma] and ZZ[gamma] gauge boson couplings at a hadron collider to date, with three constraints being the world's strongest.