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The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for pair-produced charged Higgs bosons in the framework of Two Higgs Doublet Models (2HDMs). The data of the four experiments are statistically combined. The results are interpreted within the 2HDM for Type I and Type II benchmark scenarios. No statistically significant excess has been observed when compared to the Standard Model background prediction, and the combined LEP data exclude large regions of the model parameter space. Charged Higgs bosons with mass below 80 GeV/c^2 (Type II scenario) or 72.5 GeV/c^2 (Type I scenario, for pseudo-scalar masses above 12 GeV/c^2) are excluded at the 95% confidence level

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Archivio della ricerca- Università di Roma La Sapienza

Study of the K-+/- -> pi(+/-)gamma gamma decay by the NA62 experiment

Author: 1 Ceccucci A
1 Romano A
10 Bolotov V
11 Ambrosino Fabio 12 13 Di Filippo Domenico 12, 13 Massarotti Paolo 12, 13 Napolitano Marco 12, 13 Palladino Vittorio 12, 13 Saracino Giulio 12, 13 Anzivino Giuseppina 14, 15 Imbergamo Ermanno 14, 15 Piandani Roberto 14, 15 Sergi Antonino 14, 15 Cenci Patrizia 15 Pepe Monica 15 Costantini Flavio 16, 17 Doble N
11 Duk V
11 Gushchin E
16 17 Giudici Sergio 16, 17 Pierazzini Giuseppe 16, 17 Sozzi Marco 16, 17 Venditti Stefano 16, 17 Balev Spasimir 17, 18 Collazuol Gianmaria 17, 18 DiLella L
17 18 Gallorini Stefano 17, 18 Goudzovski E
17 18 Lamanna Gianluca 17, 18 Mannelli Italo 17, 18 Ruggiero Giuseppe 17, 18 Cerri Claudio 17 Fantechi Riccardo 17 Kholodenko S
19 D'Agostini Giulio 20 21 Leonardi Emanuele 21 Serra Marco 21 Valente Paolo 21 Fucci Adolfo 22 Salamon Andrea 22 Bloch-Devaux B
19 Kurshetsov V
19 Obraztsov V
19 Semenov V
19 Yushchenko O
2 Piccini Mauro 2 Riedler P
2 Danielsson H
2 Falaleev V
2 Frabetti PL
2 Gatignon L
2 Hallgren B
2 Lopez SG
2 Maier A
2 Peters A
23 Engelfried J
23 Peyaud B
24 Coward D
25 Kozhuharov Venelin 26 Litov L
26 Arcidiacono Roberta 27 28 Bifani Simone 27, 28 Biino Cristina 28 Dellacasa Giulio 28 Marchetto Flavio Pietro 28 Numao T
29
29 Retiere F
3 Molokanova N
3 Gersabeck E
3 Kekelidze V
3 Madigozhin D
3 Misheva M
3 Movchan S
3 Potrebenikov Y
3 Rubin P
3 Shkarovskiy S
3 Zinchenko A
4 Baldini Wander 5 6 CottaRamusino A
5 6 Dalpiaz Pietro 5, 6 Fiorini Massimiliano 5, 6 Gianoli Alberto 5, 6 Norton Alan Robert 5, 6 Petrucci Ferruccio 5, 6 Savrie' Mauro 5, 6 Wahl Heinrich 5, 6 Bizzeti Andrea 7, 30 Bucci Francesca 7, 31 Iacopini Enrico
9 Kleinknecht K
9 Hita-Hochgesand M
9 Renk B
9 Wanke R
9 Winhart A
9 Winston R
Antonelli Antonella 8 Moulson Matthew David 8 Raggi Mauro 8 Spadaro Tommaso 8 Eppard K
Lazzeroni C
Lenti Massimo
Veltri Michele
Publication venue: 'Elsevier BV'
Publication date: 01/01/2014
Field of study

A study of the dynamics of the rare decay K-+/- -> pi(+/-)gamma gamma has been performed on a sample of 232 decay candidates, with an estimated background of 17.4 +/- 1.1 events, collected by the NA62 experiment at CERN in 2007. The results are combined with those from a measurement conducted by the NA48/2 Collaboration at CERN. The combined model-independent branching ratio in the kinematic range z = (m gamma gamma/m(K))(2) > 0.2 is B-MI(z > 0.2) = (0.965 +/- 0.063) x 10(-6), and the combined branching ratio in the full kinematic range assuming a Chiral Perturbation Theory description is B(K-pi gamma gamma) = (1.003 +/- 0.056) x 10(-6). A detailed comparison of the results with the previous measurements is performed. (C) 2014 The Authors. Published by Elsevier B.V

Archivio istituzionale della ricerca - Università di Urbino

Search for the dark photon in pi(0) decays

Author: 1 Arcidiacono Roberta 2
1 Kalmus G
1 Lazzeroni C
1 Slater MW
1 23 Munday DJ
1 23 Wotton SA
10 Coward D
10 Eppard K
10 Kleinknecht K
10 Marouelli P
10 Masetti L
10 Moosbrugger U
10 Morales CM
10 Renk B
10 Wache M
10 Wanke R
10 Winhart A
11 Martin TF
11 Shieh M
11 Szleper M
11 Velasco M
11 Wood MD
11 37 Cenci Patrizia 12 Pepe Monica 12 Petrucci Maria Carmela 12 Anzivino Giuseppina 13 Imbergamo Ermanno 13 Nappi Aniello 13 Piccini Mauro 13 Raggi Mauro 13 Valdata Nappi M
11 37 Dabrowski A
13 Cerri Claudio 14 Fantechi Riccardo 14 Collazuol Gianmaria 15
15
16
16
16 Costantini Flavio 17 Doble N
16 Lamanna Gianluca 15
16 Michetti Andrea 15
17 Fiorini Luca 17
18 De Beer M
18 Derre J
18 Holder M
18 Marel G
18 Mazzucato E
18 Peyaud B
18 Vallage B
18 41 Cheze JB
19 Biino Cristina 20 Cartiglia Nicolo' 20 Marchetto Flavio Pietro 20 Bifani Simone 21
19 Ziolkowski M
2 Balev S
2 Cabibbo Nicola 2 Ceccucci A
2 Cundy D
2 Fidecaro M
2 Gatignon L
2 Gonidec A
2 Kubischta W
2 Norton Alan Robert 2 27 Maier A
2 Patel M
2 26 Falaleev V
2 28 Peters A
2 3 Kekelidze V
21 Goy Lopez Silvia 21
22 Jeitler M
22 Markytan M
22 Mikulec I
22 Neuhofer G
22 Widhalm L.
23 Clemencic Marco 2
24
25 Bocquet G
3 Frabetti Pierluigi 3 Gersabeck E
3 Kozhuharov V
3 Molokanova N
3 Monnier E
3 Polenkevich I
3 Potrebenikov Y
3 Stoynev S
3 23 Hristov P
3 29 Goudzovski E
3 30
3 30 Madigozhin D
3 32 Zinchenko A
31 Litov L
31 Mannelli Italo 15
38 DiLella L
39 Giudici Sergio 17 Pierazzini Giuseppe 17 Sozzi Marco 17 Venditti Stefano 17 Bloch Devaux Brigitte 18
4 Winston R
4 33 Swallow E
4 34 Rubin P
40 Cheshkov C
42 Dibon H
5 Baldini Wander 6
5 35 Walker A
7 Cotta Ramusino Angelo 6
7 Dalpiaz Pietro 6
7 Damiani Chiara 6
7 Fiorini Massimiliano 6
7 Gianoli Alberto 6
7 Martini Mara 6
7 Petrucci Ferruccio 6
7 Savrie' Mauro 6
7 Scarpa Marcella 6
7 Wahl Heinrich
Batley JR
Bizzeti Andrea
Calvetti Mario 9 Celeghini Enrico 9 Iacopini Enrico 9 Ruggiero Giuseppe 2 9 Behler M
Lenti Massimo
VELTRI MICHELE
Publication venue: 'Elsevier BV'
Publication date: 01/01/2015
Field of study

A sample of 1.69 x 10(7) fully reconstructed pi(0) -> gamma e(+)e(-) decay candidates collected by the NA48/2 experiment at CERN in 2003-2004 is analyzed to search for the dark photon (A') production in the pi(0) -> gamma A' decay followed by the prompt A' -> e(+)e(-) decay. No signal is observed, and an exclusion region in the plane of the dark photon mass m(A') and mixing parameter epsilon(2) is established. The obtained upper limits on epsilon(2) are more stringent than the previous limits in the mass range 9 MeV/c(2) pi(+/-)A' decay is also evaluated. (C) 2015 The Authors. Published by Elsevier B.V

Archivio istituzionale della ricerca - Università di Urbino