Observation of exclusive gamma gamma production in pp? collisions at s=1.96 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F12%3A00388734" target="_blank" >RIV/68378271:_____/12:00388734 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevLett.108.081801" target="_blank" >http://dx.doi.org/10.1103/PhysRevLett.108.081801</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevLett.108.081801" target="_blank" >10.1103/PhysRevLett.108.081801</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Observation of exclusive gamma gamma production in pp? collisions at s=1.96 TeV

Popis výsledku v původním jazyce

We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 TeV, using data from 1.11 +/- 0.07 fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E-T > 2.5 GeV and pseudorapidity |eta| < 1.0, with no other particles detected in -7.4 < eta < +7.4. The two showers have similar ET and azimuthal angle separation Delta phi similar to pi; 34 events have two charged particle tracks, consistent with the QED process p<(p)over bar> --> p + e(+)e(-) + (p) over bar by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive pi(0)pi(0) is consistent with zero and is < 15 at 95% C. L. The cross section for p<(p)over bar> --> p + gamma gamma + (p) over bar with |eta(gamma)| < 1.0 and E-T(gamma) > 2.5 GeV is 2.48(-0.35)(+0.40)(stat)(-0.51)(+0.40)(syst) pb.

Název v anglickém jazyce

Observation of exclusive gamma gamma production in pp? collisions at s=1.96 TeV

Popis výsledku anglicky

We have observed exclusive gamma gamma production in proton-antiproton collisions at root s = 1.96 TeV, using data from 1.11 +/- 0.07 fb(-1) integrated luminosity taken by the Run II Collider Detector at Fermilab. We selected events with two electromagnetic showers, each with transverse energy E-T > 2.5 GeV and pseudorapidity |eta| < 1.0, with no other particles detected in -7.4 < eta < +7.4. The two showers have similar ET and azimuthal angle separation Delta phi similar to pi; 34 events have two charged particle tracks, consistent with the QED process p<(p)over bar> --> p + e(+)e(-) + (p) over bar by two-photon exchange, while 43 events have no charged tracks. The number of these events that are exclusive pi(0)pi(0) is consistent with zero and is < 15 at 95% C. L. The cross section for p<(p)over bar> --> p + gamma gamma + (p) over bar with |eta(gamma)| < 1.0 and E-T(gamma) > 2.5 GeV is 2.48(-0.35)(+0.40)(stat)(-0.51)(+0.40)(syst) pb.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BF - Elementární částice a fyzika vysokých energií

OECD FORD obor

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Projekt

<a href="/cs/project/LC527" target="_blank" >LC527: Centrum částicové fyziky</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2012

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review Letters

ISSN

0031-9007

e-ISSN

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Svazek periodika

108

Číslo periodika v rámci svazku

8

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

"081801-1"-"081801-7"

Kód UT WoS článku

000300576000006

EID výsledku v databázi Scopus

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