Attenzione: i dati modificati non sono ancora stati salvati. Per confermare inserimenti o cancellazioni di voci è necessario confermare con il tasto SALVA/INSERISCI in fondo alla pagina
IRIS
Diffractive dissociation of quasi-real photons at a photon-proton centre of mass energy of W approximate to 200 GeV is studied with the ZEUS detector at HERA. The process under consideration is gamma p --> XN, where X is the diffractively dissociated photon system of mass M-X and N is either a proton or a nucleonic system with mass M-N < 2 GeV. The cross section for this process in the interval 3 < M-X < 24 GeV relative to the total photoproduction cross section was measured to be sigma(D)(partial)/sigma(tot) = 6.2 +/- 0.2(stat) +/- 1.4(syst)%. After extrapolating this result to the mass interval of m(phi)(2) < M-X(2) < 0.05W(2) and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, gamma p --> Xp, is found to be sigma(SD)/sigma(tot) = 13.3 +/- 0.5(stat) +/- 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < M-X < 24 GeV can be described by the triple pomeron (IP IP IP) diagram with an effective pomeron intercept of alpha(IP)(0) = 1.12 +/- 0.04(stat) +/- 0.08(syst). The cross section for photon dissociation in the range 3 < Mr < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < Mr < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (IP IP IR term, its contribution to the diffractive cross section in the interval 3 < Mr < 24 GeV is estimated to be f(IP IP IR) = 26 +/- 3(stat) +/- 12(syst)%. RI Bashkirov, Vladimir/A-4818-2008; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Gladilin, Leonid/B-5226-2011; Golubkov, Yury/E-1643-2012
Diffractive dissociation of quasi-real photons at a photon-proton centre of mass energy of W approximate to 200 GeV is studied with the ZEUS detector at HERA. The process under consideration is gamma p --> XN, where X is the diffractively dissociated photon system of mass M-X and N is either a proton or a nucleonic system with mass M-N < 2 GeV. The cross section for this process in the interval 3 < M-X < 24 GeV relative to the total photoproduction cross section was measured to be sigma(D)(partial)/sigma(tot) = 6.2 +/- 0.2(stat) +/- 1.4(syst)%. After extrapolating this result to the mass interval of m(phi)(2) < M-X(2) < 0.05W(2) and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, gamma p --> Xp, is found to be sigma(SD)/sigma(tot) = 13.3 +/- 0.5(stat) +/- 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < M-X < 24 GeV can be described by the triple pomeron (IP IP IP) diagram with an effective pomeron intercept of alpha(IP)(0) = 1.12 +/- 0.04(stat) +/- 0.08(syst). The cross section for photon dissociation in the range 3 < Mr < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < Mr < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (IP IP IR term, its contribution to the diffractive cross section in the interval 3 < Mr < 24 GeV is estimated to be f(IP IP IR) = 26 +/- 3(stat) +/- 12(syst)%.
Study of photon dissociation in diffractive photoproduction at HERA
Diffractive dissociation of quasi-real photons at a photon-proton centre of mass energy of W approximate to 200 GeV is studied with the ZEUS detector at HERA. The process under consideration is gamma p --> XN, where X is the diffractively dissociated photon system of mass M-X and N is either a proton or a nucleonic system with mass M-N < 2 GeV. The cross section for this process in the interval 3 < M-X < 24 GeV relative to the total photoproduction cross section was measured to be sigma(D)(partial)/sigma(tot) = 6.2 +/- 0.2(stat) +/- 1.4(syst)%. After extrapolating this result to the mass interval of m(phi)(2) < M-X(2) < 0.05W(2) and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, gamma p --> Xp, is found to be sigma(SD)/sigma(tot) = 13.3 +/- 0.5(stat) +/- 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < M-X < 24 GeV can be described by the triple pomeron (IP IP IP) diagram with an effective pomeron intercept of alpha(IP)(0) = 1.12 +/- 0.04(stat) +/- 0.08(syst). The cross section for photon dissociation in the range 3 < Mr < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < Mr < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (IP IP IR term, its contribution to the diffractive cross section in the interval 3 < Mr < 24 GeV is estimated to be f(IP IP IR) = 26 +/- 3(stat) +/- 12(syst)%.
Diffractive dissociation of quasi-real photons at a photon-proton centre of mass energy of W approximate to 200 GeV is studied with the ZEUS detector at HERA. The process under consideration is gamma p --> XN, where X is the diffractively dissociated photon system of mass M-X and N is either a proton or a nucleonic system with mass M-N < 2 GeV. The cross section for this process in the interval 3 < M-X < 24 GeV relative to the total photoproduction cross section was measured to be sigma(D)(partial)/sigma(tot) = 6.2 +/- 0.2(stat) +/- 1.4(syst)%. After extrapolating this result to the mass interval of m(phi)(2) < M-X(2) < 0.05W(2) and correcting it for proton dissociation, the fraction of the total cross section attributed to single diffractive photon dissociation, gamma p --> Xp, is found to be sigma(SD)/sigma(tot) = 13.3 +/- 0.5(stat) +/- 3.6(syst)%. The mass spectrum of the dissociated photon system in the interval 8 < M-X < 24 GeV can be described by the triple pomeron (IP IP IP) diagram with an effective pomeron intercept of alpha(IP)(0) = 1.12 +/- 0.04(stat) +/- 0.08(syst). The cross section for photon dissociation in the range 3 < Mr < 8 GeV is significantly higher than that expected from the triple pomeron amplitude describing the region 8 < Mr < 24 GeV. Assuming that this discrepancy is due to a pomeron-pomeron-reggeon (IP IP IR term, its contribution to the diffractive cross section in the interval 3 < Mr < 24 GeV is estimated to be f(IP IP IR) = 26 +/- 3(stat) +/- 12(syst)%. RI Bashkirov, Vladimir/A-4818-2008; De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Doyle, Anthony/C-5889-2009; Gladilin, Leonid/B-5226-2011; Golubkov, Yury/E-1643-2012
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/145245
Attenzione
Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo
Citazioni
ND
40
43
social impact
Conferma cancellazione
Sei sicuro che questo prodotto debba essere cancellato?
simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
La presente simulazione è stata realizzata sulla base delle specifiche raccolte sul tavolo ER del Focus Group IRIS coordinato dall’Università di Modena e Reggio Emilia e delle regole riportate nel DM 589/2018 e allegata Tabella A. Cineca, l’Università di Modena e Reggio Emilia e il Focus Group IRIS non si assumono alcuna responsabilità in merito all’uso che il diretto interessato o terzi faranno della simulazione. Si specifica inoltre che la simulazione contiene calcoli effettuati con dati e algoritmi di pubblico dominio e deve quindi essere considerata come un mero ausilio al calcolo svolgibile manualmente o con strumenti equivalenti.