A design study, named
ESS
ν
SB
for European Spallation Source neutrino Super Beam, has been carried out during the years 2018–2022 of how the 5 MW proton linear accelerator of the European Spallation ...Source under construction in Lund, Sweden, can be used to produce the world’s most intense long-baseline neutrino beam. The high beam intensity will allow for measuring the neutrino oscillations near the second oscillation maximum at which the CP violation signal is close to three times higher than at the first maximum, where other experiments measure. This will enable CP violation discovery in the leptonic sector for a wider range of values of the CP violating phase
δ
CP
and, in particular, a higher precision measurement of
δ
CP
. The present Conceptual Design Report describes the results of the design study of the required upgrade of the ESS linac, of the accumulator ring used to compress the linac pulses from 2.86 ms to 1.2 μs, and of the target station, where the 5 MW proton beam is used to produce the intense neutrino beam. It also presents the design of the near detector, which is used to monitor the neutrino beam as well as to measure neutrino cross sections, and of the large underground far detector located 360 km from ESS, where the magnitude of the oscillation appearance of
ν
e
from
ν
μ
is measured. The physics performance of the
ESS
ν
SB
research facility has been evaluated demonstrating that after 10 years of data-taking, leptonic CP violation can be detected with more than 5 standard deviation significance over 70% of the range of values that the CP violation phase angle
δ
CP
can take and that
δ
CP
can be measured with a standard error less than 8° irrespective of the measured value of
δ
CP
. These results demonstrate the uniquely high physics performance of the proposed
ESS
ν
SB
research facility.
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration ...and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of Formula omitted for signal and Formula omitted for background, we find that there is Formula omitted Formula omitted CP violation discovery sensitivity for the baseline option of 540 km (360 km) at Formula omitted. The corresponding fraction of Formula omitted for which CP violation can be discovered at more than Formula omitted is Formula omitted. Regarding CP precision measurements, the Formula omitted error associated with Formula omitted is around Formula omitted and with Formula omitted is around Formula omitted Formula omitted for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have Formula omitted sensitivity for 540 km baseline except Formula omitted and Formula omitted sensitivity for 360 km baseline for all values of Formula omitted. The octant of Formula omitted can be determined at Formula omitted for the values of: Formula omitted ( Formula omitted and Formula omitted) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at Formula omitted are: Formula omitted ( Formula omitted) and Formula omitted eV Formula omitted eV Formula omitted ( Formula omitted eV Formula omitted eV Formula omitted) for the baseline of 540 km (360 km).
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Updated physics performance of the ESSnuSB experiment Alekou, A.; Baussan, E.; Blaskovic Kraljevic, N. ...
The European physical journal. C, Particles and fields,
12/2021, Letnik:
81, Številka:
12
Journal Article
Recenzirano
Odprti dostop
In this paper, we present the physics performance of the ESSnuSB experiment in the standard three flavor scenario using the updated neutrino flux calculated specifically for the ESSnuSB configuration ...and updated migration matrices for the far detector. Taking conservative systematic uncertainties corresponding to a normalization error of
5
%
for signal and
10
%
for background, we find that there is
10
σ
(
13
σ
)
CP violation discovery sensitivity for the baseline option of 540 km (360 km) at
δ
CP
=
±
90
∘
. The corresponding fraction of
δ
CP
for which CP violation can be discovered at more than
5
σ
is
70
%
. Regarding CP precision measurements, the
1
σ
error associated with
δ
CP
=
0
∘
is around
5
∘
and with
δ
CP
=
-
90
∘
is around
14
∘
(
7
∘
)
for the baseline option of 540 km (360 km). For hierarchy sensitivity, one can have
3
σ
sensitivity for 540 km baseline except
δ
CP
=
±
90
∘
and
5
σ
sensitivity for 360 km baseline for all values of
δ
CP
. The octant of
θ
23
can be determined at
3
σ
for the values of:
θ
23
>
51
∘
(
θ
23
<
42
∘
and
θ
23
>
49
∘
) for baseline of 540 km (360 km). Regarding measurement precision of the atmospheric mixing parameters, the allowed values at
3
σ
are:
40
∘
<
θ
23
<
52
∘
(
42
∘
<
θ
23
<
51
.
5
∘
) and
2.485
×
10
-
3
eV
2
<
Δ
m
31
2
<
2.545
×
10
-
3
eV
2
(
2.49
×
10
-
3
eV
2
<
Δ
m
31
2
<
2.54
×
10
-
3
eV
2
) for the baseline of 540 km (360 km).
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Abstract
The main source of systematic uncertainty on neutrino cross section measurements at the GeV scale originates from the poor knowledge of the initial flux. The reduction of this uncertainty to ...1% can be achieved through the monitoring of charged leptons produced in association with neutrinos. The goal of the ENUBET ERC project is to prove the feasibility of such a monitored neutrino beam. In this contribution, the final results of the ERC project, together with the complete assessment of the feasibility of its concept, are presented. An overview of the detector technology for a next generation of high precision neutrino-nucleus cross section measurements, to be performed with the ENUBET neutrino beam, is also given.
The ENUBET project is aimed at designing and experimentally demonstrating the concept of monitored neutrino beams. These novel beams are enhanced by an instrumented decay tunnel, whose detectors ...reconstruct large-angle charged leptons produced in the tunnel and give a direct estimate of the neutrino flux at the source. These facilities are thus the ideal tool for high-precision neutrino cross-section measurements at the GeV scale because they offer superior control of beam systematics with respect to existing facilities. In this paper, we present the first end-to-end design of a monitored neutrino beam capable of monitoring lepton production at the single particle level. This goal is achieved by a new focusing system without magnetic horns, a 20 m normal-conducting transfer line for charge and momentum selection, and a 40 m tunnel instrumented with cost-effective particle detectors. Employing such a design, we show that percent precision in cross-section measurements can be achieved at the CERN SPS complex with existing neutrino detectors.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
In this paper, we study scalar mediator induced nonstandard interactions (SNSIs) in the context of the ESSnuSB experiment. In particular, we study the capability of ESSnuSB to put bounds on the SNSI ...parameters and also study the impact of SNSIs in the measurement of the leptonic C P phase δ C P . Existence of SNSIs modifies the neutrino mass matrix and this modification can be expressed in terms of three diagonal real parameters ( η e e , η μ μ , and η τ τ ) and three off-diagonal complex parameters ( η e μ , η e τ , and η μ τ ). Our study shows that the upper bounds on the parameters η μ μ and η τ τ depend upon how Δ m 31 2 is minimized in the theory. However, this is not the case when one tries to measure the impact of SNSIs on δ C P . Further, we show that the C P sensitivity of ESSnuSB can be completely lost for certain values of η e e and η μ τ for which the appearance channel probability becomes independent of δ C P . Published by the American Physical Society 2024
ESSνSB is a design study for a next-generation long-baseline neutrino experiment that aims at the precise measurement of the CP-violating phase, δCP, in the leptonic sector at the second oscillation ...maximum. The conceptual design report published from the first phase of the project showed that after 10 years of data taking, more than 70% of the possible δCP range will be covered with 5σ C.L. to reject the no-CP-violation hypothesis. The expected value of δCP precision is smaller than 8◦ for all δCP values. The next phase of the project, the ESSνSB+, aims at using the intense muon flux produced together with neutrinos to measure the neutrino-nucleus cross-section, the dominant term of the systematic uncertainty, in the energy range of 0.2–0.6 GeV, using a Low Energy neutrinos from STORed Muons (LEnuSTORM) and a Low Energy Monitored Neutrino Beam (LEMNB) facilities.
The ENUBET project is aimed at designing and experimentally demonstrating the concept of monitored neutrino beams. These novel beams are enhanced by an instrumented decay tunnel, whose detectors ...reconstruct large-angle charged leptons produced in the tunnel and give a direct estimate of the neutrino flux at the source. These facilities are thus the ideal tool for high-precision neutrino cross-section measurements at the GeV scale because they offer superior control of beam systematics with respect to existing facilities. In this paper, we present the first end-to-end design of a monitored neutrino beam capable of monitoring lepton production at the single particle level. This goal is achieved by a new focusing system without magnetic horns, a 20 m normal-conducting transfer line for charge and momentum selection, and a 40 m tunnel instrumented with cost-effective particle detectors. Employing such a design, we show that percent precision in cross-section measurements can be achieved at the CERN SPS complex with existing neutrino detectors.
Neutrino oscillation experiments provide a unique window in exploring several
new physics scenarios beyond the standard three flavour. One such scenario is
quantum decoherence in neutrino oscillation ...which tends to destroy the
interference pattern of neutrinos reaching the far detector from the source. In
this work, we study the decoherence in neutrino oscillation in the context of
the ESSnuSB experiment. We consider the energy-independent decoherence
parameter and derive the analytical expressions for P$_{\mu e}$ and P$_{\mu
\mu}$ probabilities in vacuum. We have computed the capability of ESSnuSB to
put bounds on the decoherence parameters namely, $\Gamma_{21}$ and
$\Gamma_{32}$ and found that the constraints on $\Gamma_{21}$ are competitive
compared to the DUNE bounds and better than the current T2K and MINOS ones. We
have also investigated the impact of decoherence on the ESSnuSB measurement of
the Dirac CP phase $\delta_{\rm CP}$ and concluded that it remains robust in
the presence of new physics.
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