Abstract:
An updated search is performed for gluino, top squark, or bottom squark R-hadrons that have come to rest within the ATLAS calorimeter, and decay at some later time to hadronic jets and a neutralino, using 5.0 and 22:9 fb -1 of pp collisions at 7 and 8 TeV, respectively. Candidate decay events are triggered in selected empty bunch crossings of the LHC in order to remove pp collision backgrounds. Selections based on jet shape and muon system activity are applied to discriminate signal events from cosmic ray and beam-halo muon backgrounds. In the absence of an excess of events, improved limits are set on gluino, stop, and sbottom masses for different decays, lifetimes, and neutralino masses. With a neutralino of mass 100 GeV, the analysis excludes gluinos with mass below 832 GeV (with an expected lower limit of 731 GeV), for a gluino lifetime between 10 μs and 1000 s in the generic R-hadron model with equal branching ratios for decays to (formula presented) and (formula presented). Under the same assumptions for the neutralino mass and squark lifetime, top squarks and bottom squarks in the Regge R-hadron model are excluded with masses below 379 and 344 GeV, respectively. © 2013 CERN.
Registro:
Documento: |
Artículo
|
Título: | Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector |
Autor: | Aad, G. et al.
Este artículo contiene 2934 autores, consultelos en el artículo en formato pdf.
|
Filiación: |
Este artículo contiene 2934 autores con sus filiaciones, consultelas en el artículo en formato pdf.
|
Año: | 2013
|
Volumen: | 88
|
Número: | 11
|
Página de inicio: | 112003-1
|
Página de fin: | 112003-30
|
DOI: |
http://dx.doi.org/10.1103/PhysRevD.88.112003 |
Título revista: | Physical Review D - Particles, Fields, Gravitation and Cosmology
|
Título revista abreviado: | Phys Rev D Part Fields Gravit Cosmol
|
ISSN: | 15507998
|
CODEN: | PRVDA
|
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15507998_v88_n11_p112003-1_Aad |
Referencias:
- Fairbairn, M., (2007) Phys. Rep, 438, p. 1
- Miyazawa, H., (1966) Prog. Theor. Phys, 36, p. 1266
- Ramond, P., (1971) Phys. Rev. D, 3, p. 2415
- Gol’Fand, Y.A., Likhtman, E.P., (1971) Pis’ma Zh. Eksp. Teor. Fiz, 13 (452). , [JETP Lett. 13, 323 (1971)
- Neveu, A., Schwarz, J.H., (1971) Nucl. Phys, B31, p. 86
- Neveu, A., Schwarz, J.H., (1971) Phys. Rev. D, 4, p. 1109
- Gervais, J., Sakita, B., (1971) Nucl. Phys, B34, p. 632
- Volkov, D.V., Akulov, V.P., (1973) Phys. Lett, 46B, p. 109
- Wess, J., Zumino, B., (1974) Phys. Lett, 49B, p. 52
- Wess, J., Zumino, B., (1974) Nucl. Phys, B70, p. 39
- Fayet, P., (1976) Phys. Lett, 64B, p. 159
- Fayet, P., (1977) Phys. Lett, 69B, p. 489
- Farrar, G.R., Fayet, P., (1978) Phys. Lett, 76B, p. 575
- Fayet, P., (1979) Phys. Lett, 84B, p. 416
- Dimopoulos, S., Georgi, H., (1981) Nucl. Phys, B193, p. 150
- Arkani-Hamed, N., Dimopoulos, S., (2005) J. High Energy Phys, 6, p. 073
- Arkani-Hamed, N., Dimopoulos, S., Giudice, G.F., Romanino, A., (2005) Nucl. Phys, B709, p. 3
- Dine, M., Fischler, W., (1982) Phys. Lett, 110B, p. 227
- Alvarez-Gaume, L., Claudson, M., Wise, M.B., (1982) Nucl. Phys, B207, p. 96
- Nappi, C.R., Ovrut, B.A., (1982) Phys. Lett, 113B, p. 175
- Dine, M., Nelson, A.E., (1993) Phys. Rev. D, 48, p. 1277
- Dine, M., Nelson, A.E., Shirman, Y., (1995) Phys. Rev. D, 51, p. 1362
- Dine, M., Nelson, A.E., Nir, Y., Shirman, Y., (1996) Phys. Rev. D, 53, p. 2658
- Raby, S., (1997) Phys. Rev. D, 56, p. 2852
- Appelquist, T., Cheng, H., Dobrescu, B.A., (2001) Phys. Rev. D, p. 64
- Friberg, C., Norrbin, E., Sjostrand, T., (1997) Phys. Lett. B, 403, p. 329
- Johansen, M., Edsjo, J., Hellman, S., Milstead, D., (2010) J. High Energy Phys, 8, p. 005
- Evans, J.A., Kats, Y., (2013) J. High Energy Phys, 4, p. 028
- Kraan, A.C., (2004) Eur. Phys. J. C, 37, p. 91
- Evans, L., Bryant, P., (2008) JINST, 3
- (2007) Phys. Rev. Lett, p. 99
- (2011) Phys. Rev. Lett, p. 106
- (2012) J. High Energy Phys, 8, p. 026
- (2012) Eur. Phys. J. C, 72, p. 1965
- (2011) Phys. Lett. B, 701, p. 1
- (2011) Phys. Lett. B, 703, p. 428
- (2008) JINST, 3, p. S08003
- ATLAS uses a right-handed coordinate system with its origin at the nominal interaction point (IP) in the center of the detector and the z axis along the beam pipe. The x axis points from the IP to the center of the LHC ring, and the y axis points upward. Cylindrical coordinates (r;ϕ) are used, ϕ being the azimuthal angle around the beam pipe. The pseudorapidity is defined in terms of the polar angle, θ as η= -ln tan (θ=2); (2010) Eur. Phys. J. C, 70, p. 875
- Lampl, W., (2008), ATL-LARG-PUB-2008-002, ATL-COM-LARG-2008-003, CERN, Geneva; Cacciari, M., Salam, G.P., Soyez, G., (2008) J. High Energy Phys, 4, p. 063
- Dotti, A., Lupi, A., Roda, C., (2006) Nucl. Phys. B, Proc, 150, p. 106
- (2011) Eur. Phys. J. C, 71, p. 1521
- Gianfelice-Wendt, E., Bartmann, W., Boccardi, A., Bracco, C., Bravin, E., (2012), FERMILAB-CONF-12-142-APC, Fermilab; (2010), ATLAS Collaboration, ATLAS-CONF-2010-102, CERN, Geneva; Ohm, C., Pauly, T., (2010) Nucl. Instrum. Methods Phys. Res., Sect. A, 623, p. 558
- (2012) Eur. Phys. J. C, 72, p. 1849
- Sjostrand, T., Mrenna, S., Skands, P., (2006) J. High Energy Phys, 5, p. 026
- Pumplin, J., Stump, D., Huston, J., Lai, H.-L., Nadolsky, P., Tung, W.-K., (2002) J. High Energy Phys, 7, p. 012
- Andersson, B., Gustafson, G., Ingelman, G., Sjostrand, T., (1983) Phys. Rep, 97, p. 31
- (2003) Nucl. Instrum. Methods Phys. Res., Sect. A, 506, p. 250
- (2010) Eur. Phys. J. C, 70, p. 823
- Mackeprang, R., Rizzi, A., (2007) Eur. Phys. J. C, 50, p. 353
- De Boer, Y.R., Kaidalov, A.B., Milstead, D.A., Piskounova, O.I., (2008) J. Phys. G, p. 35
- Mackeprang, R., Milstead, D., (2010) Eur. Phys. J. C, 66, p. 493
- Farrar, G., Mackeprang, R., Milstead, D., Roberts, J., (2011) J. High Energy Phys, 2, p. 018
- Arvanitaki, A., Dimopoulos, S., Pierce, A., Rajendran, S., Wacker, J.G., (2007) Phys. Rev. D, 76
- Azhgirey, L.S., Baishev, I.S., Potter, K.M., Talanov, V., CERN-LHC-Project-Report-722; (2013) JINST, 8, p. P07004
- (2011) Eur. Phys. J. C, 71, p. 1630
- Heinrich, J., Blocker, C., Conway, J., Demortier, L., Lyons, L., Punzi, G., Sinervo, P.K., arXiv:physics/ 0409129; Beenakker, W., Hopker, R., Spira, M., Zerwas, P., (1997) Nucl. Phys, B492, p. 51
- Kulesza, A., Motyka, L., (2009) Phys. Rev. Lett, p. 102
- Kulesza, A., Motyka, L., (2009) Phys. Rev, D80
- Beenakker, W., Brensing, S., Krämer, M., Kulesza, A., Laenen, E., Niessen, I., (2009) J. High Energy Phys, 12, p. 041
- Beenakker, W., Brensing, S., Krämer, M., Kulesza, A., Laenen, E., Motyka, L., Niessen, I., (2011) Int. J. Mod. Phys. A, 26, p. 2637
- Kramer, M., Kulesza, A., Van Der Leeuw, R., Mangano, M., Padhi, S., arXiv:1206.2892
Citas:
---------- APA ----------
(2013)
. Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector. Physical Review D - Particles, Fields, Gravitation and Cosmology, 88(11), 112003-1-112003-30.
http://dx.doi.org/10.1103/PhysRevD.88.112003---------- CHICAGO ----------
Aad, G.
"Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector"
. Physical Review D - Particles, Fields, Gravitation and Cosmology 88, no. 11
(2013) : 112003-1-112003-30.
http://dx.doi.org/10.1103/PhysRevD.88.112003---------- MLA ----------
Aad, G.
"Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector"
. Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 88, no. 11, 2013, pp. 112003-1-112003-30.
http://dx.doi.org/10.1103/PhysRevD.88.112003---------- VANCOUVER ----------
Aad, G. Search for long-lived stopped R-hadrons decaying out of time with pp collisions using the ATLAS detector. Phys Rev D Part Fields Gravit Cosmol. 2013;88(11):112003-1-112003-30.
http://dx.doi.org/10.1103/PhysRevD.88.112003