Ερευνητικό υλικό ΕΚΠΑ

First observations of separated atmospheric nu(mu) and (nu)over-bar(mu)
events in the MINOS detector

Αγγλικά

The complete 5.4 kton MINOS far detector has been taking data since the
beginning of August 2003 at a depth of 2070 meters water-equivalent in
the Soudan mine, Minnesota. This paper presents the first MINOS
observations of nu(mu) and (nu) over bar (mu) charged-current
atmospheric neutrino interactions based on an exposure of 418 days. The
ratio of upward- to downward-going events in the data is compared to the
Monte Carlo expectation in the absence of neutrino oscillations, giving
R-up/down(data)/R-up/down(MC)=0.62(-0.14)(+0.19)(stat.)+/- 0.02(sys.).
An extended maximum likelihood analysis of the observed L/E
distributions excludes the null hypothesis of no neutrino oscillations
at the 98% confidence level. Using the curvature of the observed muons
in the 1.3 T MINOS magnetic field nu(mu) and (nu) over bar (mu)
interactions are separated. The ratio of (nu) over bar (mu) to nu(mu)
events in the data is compared to the Monte Carlo expectation assuming
neutrinos and antineutrinos oscillate in the same manner, giving R-(nu)
over bar mu/nu(data)(mu)/R-(nu) over bar
mu/nu(MC)(mu)=0.96(-0.27)(+0.38)(stat.)+/- 0.15(sys.), where the errors
are the statistical and systematic uncertainties. Although the
statistics are limited, this is the first direct observation of
atmospheric neutrino interactions separately for nu(mu) and (nu) over
bar (mu).

2006

Adamson, P
Alexopoulos, T
Allison, WWM
Alner, GJ and
Anderson, K
Andreopoulos, C
Andrews, M
Andrews, R and
Arroyo, C
Avvakumov, S
Ayres, DS
Baller, B
Barish, B and
Barker, MA
Barnes, PD
Barr, G
Barrett, WL
Beall, E and
Becker, BR
Belias, A
Bergfeld, T
Bernstein, RH and
Bhattacharya, D
Bishai, M
Blake, A
Bocean, V
Bock, B and
Bock, GJ
Boehm, J
Boehnlein, DJ
Bogert, D
Border, PM and
Bower, C
Boyd, S
Buckley-Geer, E
Byon-Wagner, A
Cabrera,
A
Chapman, JD
Chase, TR
Chernichenko, SK
Childress, S
and Choudhary, BC
Cobb, JH
Cossairt, JD
Courant, H and
Crane, DA
Culling, AJ
Dawson, JW
DeMuth, DM
De Santo, A
and Dierckxsens, M
Diwan, MV
Dorman, M
Drake, G
Ducar, R
and Durkin, T
Erwin, AR
Escobar, CO
Evans, J
Fackler, OD
and Harris, EF
Feldman, GJ
Felt, N
Fields, TH
Ford, R
and Frohne, MV
Gallagher, HR
Gebhard, M
Godley, A
Gogos,
J
Goodman, MC
Gornushkin, Y
Gouffon, P
Grashorn, E and
Grossman, N
Grudzinski, JJ
Grzelak, K
Guarino, V
Habig,
A
Halsall, R
Hanson, J
Harris, D
Harris, PG and
Hartnell, J
Hartouni, EP
Hatcher, R
Heller, K
Hill, N
and Ho, Y
Howcroft, C
Hylen, J
Ignatenko, M
Indurthy, D
and Irwin, GM
James, C
Jenner, L
Jensen, D
Joffe-Minor,
T
Kafka, T
Kang, HJ
Kasahara, SMS
Kilmer, J
Kim, H
and Koizumi, G
Kopp, S
Kordosky, M
Koskinen, DJ
Kostin,
M
Krakauer, DA
Kumaratunga, S
Ladran, AS
Lang, K and
Laughton, C
Lebedev, A
Lee, R
Lee, WY
Libkind, MA and
Liu, J
Litchfield, PJ
Litchfield, RP
Longley, NP
Lucas,
P
Luebke, W
Madani, S
Maher, E
Makeev, V
Mann, WA
and Marchionni, A
Marino, AD
Marshak, ML
Marshall, JS and
McDonald, J
McGowan, A
Meier, JR
Merzon, GI
Messier, MD
and Michael, DG
Milburn, RH
Miller, JL
Miller, WH and
Mishra, SR
Miyagawa, PS
Moore, C
Morfin, J
Morse, R and
Mualem, L
Mufson, S
Murgia, S
Murtagh, MJ
Musser, J and
Naples, D
Nelson, C
Nelson, JK
Newman, HB
Nezrick, F and
Nichol, RJ
Nicholls, TC
Ochoa-Ricoux, JP
Oliver, J and
Oliver, WP
Onuchin, VA
Osiecki, T
Ospanov, R
Paley, J
and Paolone, V
Para, A
Patzak, T
Pavlovich, Z
Pearce, GF
and Pearson, N
Peck, CW
Perry, C
Peterson, EA
Petyt, DA
and Ping, H
Piteira, R
Pla-Dalmau, A
Plunkett, RK
Price,
LE
Proga, M
Pushka, DR
Rahman, D
Rameika, RA
Raufer,
TM
Read, AL
Rebel, B
Reyna, DE
Rosenfeld, C
Rubin,
HA
Ruddick, K
Ryabov, VA
Saakyan, R
Sanchez, MC and
Saoulidou, N
Schneps, J
Schoessow, PV
Schreiner, P and
Schwienhorst, R
Semenov, VK
Seun, SM
Shanahan, P
Shield,
PD
Smart, W
Smirnitsky, V
Smith, C
Smith, PN
Sousa,
A
Speakman, B
Stamoulis, P
Stefanik, A
Sullivan, P and
Swan, JM
Symes, PA
Tagg, N
Talaga, RL
Tetteh-Lartey, E
and Thomas, J
Thompson, J
Thomson, MA
Thron, JL and
Trendler, R
Trevor, J
Trostin, I
Tsarev, VA
Tzanakos, G
and Urheim, J
Vahle, P
Vakili, M
Vaziri, K
Velissaris, C
and Verebryusov, V
Viren, B
Wai, L
Ward, CP
Ward, DR and
Watabe, M
Weber, A
Webb, RC
Wehmann, A
West, N and
White, C
White, RF
Wojcicki, SG
Wright, DM
Wu, QK and
Yan, WG
Yang, T
Yumiceva, FX
Yun, JC
Zheng, H
Zois,
M
Zwaska, R
MMINOS Collaboration

Physical Review D

AMER PHYSICAL SOC

73

7

https://doi.org/10.1103/PhysRevD.73.072002

10.1103/PhysRevD.73.072002

https://pergamos.lib.uoa.gr/uoa/dl/object/3099262